mirror of
https://github.com/isometimes/rpi4-osdev
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Upgraded part15-tcpip to include code for serving web pages
This commit is contained in:
Adam Greenwood-Byrne
parent
f5b10bb1de
commit
76be43e53a
35 changed files with 332 additions and 636 deletions
BIN
part15-tcpip-webserver/.DS_Store
vendored
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part15-tcpip-webserver/.DS_Store
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part15-tcpip-webserver/README.md
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part15-tcpip-webserver/README.md
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@ -0,0 +1,94 @@
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Writing a "bare metal" operating system for Raspberry Pi 4 (Part 15)
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====================================================================
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Adding a TCP/IP stack
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---------------------
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Having achieved "proof of life" from our Ethernet module in _part14-spi-ethernet_, you're doubtless wondering how to go from there to serving web pages, posting tweets on Twitter or perhaps even just simply responding to a ping!
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This is where you'll need a fully-fledged TCP/IP stack that goes way beyond handcrafted ARPs, implementing many more protocols to achieve efficient bi-directional communication.
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In this part we make use of some code from Guido Socher of [tuxgraphics.org](http://tuxgraphics.org/), designed to be a lightweight TCP/IP stack for embedded devices. I chose this because it was super simple to get working (or "port"), but you might want to look at [LwIP](https://en.wikipedia.org/wiki/LwIP) if you need something more advanced.
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The code
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--------
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Most of the new code is in the _tcpip/_ subdirectory. I actually came across it in [this tarball](http://tuxgraphics.org/common/src2/article09051/eth_tcp_client_server-dhcp-5.10.tar.gz) and, again, made only a very few cosmetic changes (`diff` is your friend!).
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It did require me to expose the `strlen()` function we implemented in _lib/fb.c_, so that's added to _include/fb.h_. Similarly, we expose the `memcpy()` function we implemented in _kernel/kernel.c_, so that's added to _kernel/kernel.h_.
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I also needed a single function that tells the ENC to send a packet. Nothing new here, just different packaging:
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```c
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void enc28j60PacketSend(unsigned short buflen, void *buffer) {
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if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
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ENC_WriteBuffer((unsigned char *) buffer, buflen);
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handle.transmitLength = buflen;
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ENC_Transmit(&handle);
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}
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}
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```
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This was also added to _kernel/kernel.h_.
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What happened to _arp.c_?
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-------------------------
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You'll notice that I've merged _arp.c_ and _kernel.c_. We still initialise the network card in exactly the same way but, when we're done, we call this function in Guido's code:
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```c
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init_udp_or_www_server(myMAC, deviceIP);
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```
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This tells the TCP/IP library who we are, so we're all on the same page!
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Finally, and aside from a little cleanup (eg. moving the HAL timer functions to _io.c_ with the commensurate changes to _io.h_), the major change is the new `serve()` function:
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```c
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void serve(void)
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{
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while (1) {
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while (!ENC_GetReceivedFrame(&handle));
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uint8_t *buf = (uint8_t *)handle.RxFrameInfos.buffer;
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uint16_t len = handle.RxFrameInfos.length;
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uint16_t dat_p = packetloop_arp_icmp_tcp(buf, len);
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if (dat_p != 0) {
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debugstr("Incoming web request... ");
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if (strncmp("GET ", (char *)&(buf[dat_p]), 4) != 0) {
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debugstr("not GET");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 401 Unauthorized\r\nContent-Type: text/html\r\n\r\n<h1>ERROR</h1>");
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} else {
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if (strncmp("/ ", (char *)&(buf[dat_p+4]), 2) == 0) {
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// just one web page in the "root directory" of the web server
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debugstr("GET root");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>Hello world!</h1>");
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} else {
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// just one web page not in the "root directory" of the web server
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debugstr("GET not root");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>Goodbye cruel world.</h1>");
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}
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}
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www_server_reply(buf, dat_p); // send web page data
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debugcrlf();
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}
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}
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}
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```
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This is an infinite loop which waits for an incoming packet and then firstly passes it to Guido's `packetloop_arp_icmp_tcp()` function. This function implements some useful things, like responding to pings. I modified the routine to print a message to the screen when it sends a "pong" (look from line 1371 of _tcpip/ip_arp_udp_tcp.c_), so we can see when it's in action!
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Examining the return value of `packetloop_arp_icmp_tcp()` then allows us to check whether there is an incoming web request, since we've configured the TCP/IP library to be a web server in _tcpip/ip_config.h_ with `#define WWW_server`.
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We then serve responses based on three possible cases:
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* The incoming request is not a GET request (eg. maybe it's a HEAD request) - you can simulate this using the `curl` tool: `curl -I 192.168.0.66`
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* The incoming request is a GET request for the root web page `/` - `curl 192.168.0.66/`
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* The incoming request is a GET request for any non-root web page - eg. `curl 192.168.0.66/isometimes/monkey`
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I recommend reading [this page](http://tuxgraphics.org/electronics/200905/embedded-tcp-ip-stack.shtml) for a full explanation. The code I have ported is very similar to what you see there.
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_Imagine my excitement when I built, ran and could ping my RPi4 at 192.168.0.66 and get a web response to my browser on both my laptop and my iPhone!_
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BIN
part15-tcpip-webserver/images/15-tcpip-webserver-browser.png
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part15-tcpip-webserver/images/15-tcpip-webserver-browser.png
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After Width: | Height: | Size: 519 KiB |
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Before Width: | Height: | Size: 50 KiB After Width: | Height: | Size: 50 KiB |
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@ -17,3 +17,5 @@ void gpio_setPinOutputBool(unsigned int pin_number, unsigned int onOrOff);
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void gpio_initOutputPinWithPullNone(unsigned int pin_number);
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void uart_hex(unsigned int d);
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void uart_byte(unsigned char b);
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unsigned long HAL_GetTick(void);
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void HAL_Delay(unsigned int ms);
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@ -1,17 +1,8 @@
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#include "../net/enc28j60.h"
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#include "../include/fb.h"
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#include "../include/spi.h"
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#include "../net/enc28j60.h"
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#include "../tcpip/ip_arp_udp_tcp.h"
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ENC_HandleTypeDef handle;
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// MAC address to be assigned to the ENC28J60
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unsigned char myMAC[6] = { 0xc0, 0xff, 0xee, 0xc0, 0xff, 0xee };
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// IP address to be assigned to the ENC28J60
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unsigned char deviceIP[4] = { 192, 168, 0, 66 };
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// HELPER FUNCTIONS
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void *memset(void *dest, unsigned char val, unsigned short len)
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@ -45,27 +36,31 @@ uint8_t memcmp(void *str1, void *str2, unsigned count)
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return 0;
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}
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void enc28j60PacketSend(unsigned short buflen, void *buffer) {
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if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
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ENC_WriteBuffer((unsigned char *) buffer, buflen);
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handle.transmitLength = buflen;
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ENC_Transmit(&handle);
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}
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}
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// MAIN FUNCTIONS
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void net_test(void)
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int strncmp(const char *s1, const char *s2, unsigned short n)
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{
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while (1) {
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while (!ENC_GetReceivedFrame(&handle));
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unsigned char u1, u2;
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uint16_t len = handle.RxFrameInfos.length;
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uint8_t *buffer = (uint8_t *)handle.RxFrameInfos.buffer;
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packetloop_arp_icmp_tcp(buffer, len);
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while (n-- > 0)
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{
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u1 = (unsigned char) *s1++;
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u2 = (unsigned char) *s2++;
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if (u1 != u2) return u1 - u2;
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if (u1 == '\0') return 0;
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}
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return 0;
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}
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// NETWORKING GLOBALS AND FUNCTIONS
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ENC_HandleTypeDef handle;
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// MAC address to be assigned to the ENC28J60
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unsigned char myMAC[6] = { 0xc0, 0xff, 0xee, 0xc0, 0xff, 0xee };
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// IP address to be assigned to the ENC28J60
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unsigned char deviceIP[4] = { 192, 168, 0, 66 };
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void init_network(void)
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{
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handle.Init.DuplexMode = ETH_MODE_HALFDUPLEX;
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@ -100,3 +95,61 @@ void init_network(void)
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debugstr("done.");
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debugcrlf();
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}
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void enc28j60PacketSend(unsigned short buflen, void *buffer) {
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if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
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ENC_WriteBuffer((unsigned char *) buffer, buflen);
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handle.transmitLength = buflen;
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ENC_Transmit(&handle);
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}
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}
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void serve(void)
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{
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while (1) {
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while (!ENC_GetReceivedFrame(&handle));
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uint8_t *buf = (uint8_t *)handle.RxFrameInfos.buffer;
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uint16_t len = handle.RxFrameInfos.length;
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uint16_t dat_p = packetloop_arp_icmp_tcp(buf, len);
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if (dat_p != 0) {
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debugstr("Incoming web request... ");
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if (strncmp("GET ", (char *)&(buf[dat_p]), 4) != 0) {
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debugstr("not GET");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 401 Unauthorized\r\nContent-Type: text/html\r\n\r\n<h1>ERROR</h1>");
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} else {
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if (strncmp("/ ", (char *)&(buf[dat_p+4]), 2) == 0) {
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// just one web page in the "root directory" of the web server
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debugstr("GET root");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>Hello world!</h1>");
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} else {
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// just one web page not in the "root directory" of the web server
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debugstr("GET not root");
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dat_p = fill_tcp_data(buf, 0, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>Goodbye cruel world.</h1>");
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}
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}
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www_server_reply(buf, dat_p); // send web page data
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debugcrlf();
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}
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}
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}
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// MAIN FUNCTION
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void main(void)
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{
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fb_init();
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// Init network and serve web pages
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spi_init();
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init_network();
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serve();
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// Catch us if we fall
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while(1);
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}
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2
part15-tcpip-webserver/kernel/kernel.h
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2
part15-tcpip-webserver/kernel/kernel.h
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void enc28j60PacketSend(unsigned short buflen, void *buffer);
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void *memcpy(void *dest, const void *src, unsigned short len);
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}
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uart_writeByteBlockingActual(' ');
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}
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// TIMER
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struct timer_regs {
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volatile unsigned int control_status;
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volatile unsigned int counter_lo;
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volatile unsigned int counter_hi;
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volatile unsigned int compare[4];
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};
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#define REGS_TIMER ((struct timer_regs *)(PERIPHERAL_BASE + 0x00003000))
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unsigned long HAL_GetTick(void) {
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unsigned int hi = REGS_TIMER->counter_hi;
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unsigned int lo = REGS_TIMER->counter_lo;
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//double check hi value didn't change after setting it...
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if (hi != REGS_TIMER->counter_hi) {
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hi = REGS_TIMER->counter_hi;
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lo = REGS_TIMER->counter_lo;
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}
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return ((unsigned long)hi << 32) | lo;
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}
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void HAL_Delay(unsigned int ms) {
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unsigned long start = HAL_GetTick();
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while(HAL_GetTick() < start + (ms * 1000));
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}
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@ -81,6 +81,7 @@ Errata 18 is implemented in lwip stack
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/* Includes ------------------------------------------------------------------*/
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#include "enc28j60.h"
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#include "../include/fb.h"
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#include "../include/io.h"
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/** @addtogroup BSP
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* @{
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@ -1171,6 +1172,8 @@ void ENC_Transmit(ENC_HandleTypeDef *handle)
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enc_waitwhilegreg(ENC_EIR, EIR_TXIF | EIR_TXERIF, 0);
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#endif
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HAL_Delay(20); // Added by AGB - fixes weird timing bug
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/* Stop transmission */
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enc_bfcgreg(ENC_ECON1, ECON1_TXRTS);
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@ -61,11 +61,6 @@
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#define MIN_FRAMELEN 64
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#define MAX_FRAMELEN 1518
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/* External functions --------------------------------------------------------*/
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void HAL_Delay(volatile uint32_t Delay);
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uint32_t HAL_GetTick(void);
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/* Callback functions *********************************************************/
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/**
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@ -16,19 +16,21 @@
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* large pages.
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*
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*********************************************/
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#include "net.h"
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#include "../net/enc28j60.h"
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#include "../kernel/kernel.h"
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#include "../include/fb.h"
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#include "ip_config.h"
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#include "ip_arp_udp_tcp.h"
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// I use them to debug stuff:
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#define LEDOFF PORTB|=(1<<PORTB1)
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#define LEDON PORTB&=~(1<<PORTB1)
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#define LEDISOFF PORTB&(1<<PORTB1)
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//
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static uint8_t macaddr[6];
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static uint8_t ipaddr[4]={0,0,0,0};
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//static uint8_t seqnum=0xa; // my initial tcp sequence number
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static uint8_t seqnum=0xa; // my initial tcp sequence number
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static void (*icmp_callback)(uint8_t *ip);
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//
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#if defined (NTP_client) || defined (UDP_client) || defined (TCP_client) || defined (PING_client)
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#define ARP_MAC_resolver_client 1
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@ -59,10 +61,10 @@ static uint16_t (*client_tcp_datafill_callback)(uint8_t);
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static uint8_t www_fd=0;
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static uint8_t browsertype=0; // 0 = get, 1 = post
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static void (*client_browser_callback)(uint16_t,uint16_t,uint16_t); // the fields are: uint16_t webstatuscode,uint16_t datapos,uint16_t len; datapos is start of http data and len the the length of that data
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static const prog_char *client_additionalheaderline;
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static const char *client_additionalheaderline_p; // null pointer or pointer to a string in progmem
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static char *client_postval;
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static const prog_char *client_urlbuf;
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static const char *client_urlbuf_var;
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static const char *client_urlbuf_p; // null pointer or pointer to a string in progmem
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static char *client_urlbuf_var;
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static const char *client_hoststr;
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static uint8_t *bufptr=0; // ugly workaround for backward compatibility
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#endif
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@ -89,6 +91,8 @@ static uint16_t info_data_len=0;
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#if defined (ALL_clients)
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static uint8_t ipnetmask[4]={255,255,255,255};
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#endif
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#if defined (ALL_clients) || defined (WOL_client)
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static uint8_t ipid=0x2; // IP-identification, it works as well if you do not change it but it is better to fill the field, we count this number up and wrap.
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const char iphdr[] ={0x45,0,0,0x82,0,0,0x40,0,0x20}; // 0x82 is the total len on ip, 0x20 is ttl (time to live), the second 0,0 is IP-identification and may be changed.
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#endif
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@ -412,20 +416,6 @@ uint16_t fill_tcp_data_p(uint8_t *buf,uint16_t pos, const uint8_t *progmem_s)
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return(pos);
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}
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uint16_t fill_tcp_data_string(uint8_t *buf,uint16_t pos, char *reply)
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{
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// char c;
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// fill in tcp data at position pos
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//
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// with no options the data starts after the checksum + 2 more bytes (urgent ptr)
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while ( !(*reply == '\n') ) {
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buf[TCP_CHECKSUM_L_P+3+pos] = *reply;
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reply++;
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pos++;
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}
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return(pos);
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}
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// fill a binary string of len data into the tcp packet
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uint16_t fill_tcp_data_len(uint8_t *buf,uint16_t pos, const uint8_t *s, uint8_t len)
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{
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@ -644,22 +634,21 @@ void www_server_reply(uint8_t *buf,uint16_t dlen)
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// This code requires that we send only one data packet
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// because we keep no state information. We must therefore set
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// the fin here:
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buf[TCP_FLAGS_P]=TCP_FLAGS_ACK_V|TCP_FLAGS_PUSH_V;//|TCP_FLAGS_FIN_V;
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buf[TCP_FLAGS_P]=TCP_FLAGS_ACK_V|TCP_FLAGS_PUSH_V|TCP_FLAGS_FIN_V;
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make_tcp_ack_with_data_noflags(buf,dlen); // send data
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}
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#endif // WWW_server
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#if defined (ALL_clients)
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#if defined (ALL_clients) || defined (GRATARP) || defined (WOL_client)
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// fill buffer with a prog-mem string
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void fill_buf_p(uint8_t *buf,uint16_t len, const char *progmem_s)
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void fill_buf_p(uint8_t *buf,uint16_t len, const char *progmem_str_p)
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{
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uint8_t i=0;
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while (len){
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*buf= progmem_s[i];
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*buf= pgm_read_byte(progmem_str_p);
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buf++;
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len--; i++;
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progmem_str_p++;
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len--;
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}
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}
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#endif
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|
|
@ -725,6 +714,7 @@ void client_ntp_request(uint8_t *buf,uint8_t *ntpip,uint8_t srcport,uint8_t *dst
|
|||
{
|
||||
uint8_t i=0;
|
||||
uint16_t ck;
|
||||
if (!enc28j60linkup())return;
|
||||
//
|
||||
while(i<6){
|
||||
buf[ETH_DST_MAC +i]=dstmac[i]; // gw mac in local lan or host mac
|
||||
|
|
@ -1179,27 +1169,27 @@ uint16_t www_client_internal_datafill_callback(uint8_t fd){
|
|||
if (browsertype==0){
|
||||
// GET
|
||||
len=fill_tcp_data_p(bufptr,0,PSTR("GET "));
|
||||
len=fill_tcp_data_p(bufptr,len,client_urlbuf);
|
||||
len=fill_tcp_data_p(bufptr,len,client_urlbuf_p);
|
||||
len=fill_tcp_data(bufptr,len,client_urlbuf_var);
|
||||
// I would prefer http/1.0 but there is a funny
|
||||
// bug in some apache webservers which causes
|
||||
// them to send two packets (fragmented PDU)
|
||||
// if we don't use HTTP/1.1 + Connection: close
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR(" HTTP/1.1\r\nHost: "));
|
||||
len=fill_tcp_data(bufptr,len,client_hoststr);
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("\r\nUser-Agent: tgr/1.1\r\nAccept: text/html\r\nConnection: close\r\n\r\n"));
|
||||
len=fill_tcp_data_p(bufptr,len,client_hoststr);
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("\r\nUser-Agent: tgr/1.1\r\nAccept: text/html\r\n\r\n"));
|
||||
}else{
|
||||
// POST
|
||||
len=fill_tcp_data_p(bufptr,0,PSTR("POST "));
|
||||
len=fill_tcp_data_p(bufptr,len,client_urlbuf);
|
||||
len=fill_tcp_data_p(bufptr,len,client_urlbuf_p);
|
||||
len=fill_tcp_data(bufptr,len,client_urlbuf_var);
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR(" HTTP/1.1\r\nHost: "));
|
||||
len=fill_tcp_data(bufptr,len,client_hoststr);
|
||||
if (client_additionalheaderline){
|
||||
len=fill_tcp_data_p(bufptr,len,client_hoststr);
|
||||
if (client_additionalheaderline_p){
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("\r\n"));
|
||||
len=fill_tcp_data_p(bufptr,len,client_additionalheaderline);
|
||||
len=fill_tcp_data_p(bufptr,len,client_additionalheaderline_p);
|
||||
}
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("\r\nUser-Agent: tgr/1.1\r\nAccept: */*\r\nConnection: close\r\n"));
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("\r\nUser-Agent: tgr/1.1\r\nAccept: */*\r\n"));
|
||||
len=fill_tcp_data_p(bufptr,len,PSTR("Content-Length: "));
|
||||
itoa(strlen(client_postval),strbuf,10);
|
||||
len=fill_tcp_data(bufptr,len,strbuf);
|
||||
|
|
@ -1260,10 +1250,10 @@ uint8_t www_client_internal_result_callback(uint8_t fd, uint8_t statuscode, uint
|
|||
// The string buffers to which urlbuf_varpart and hoststr are pointing
|
||||
// must not be changed until the callback is executed.
|
||||
//
|
||||
void client_browse_url(const prog_char *urlbuf,const char *urlbuf_varpart,const char *hoststr,void (*callback)(uint16_t,uint16_t,uint16_t),uint8_t *dstip,uint8_t *dstmac)
|
||||
void client_browse_url(const char *urlbuf_p,char *urlbuf_varpart,const char *hoststr,void (*callback)(uint16_t,uint16_t,uint16_t),uint8_t *dstip,uint8_t *dstmac)
|
||||
{
|
||||
if (!enc28j60linkup())return;
|
||||
client_urlbuf=urlbuf;
|
||||
client_urlbuf_p=urlbuf_p;
|
||||
client_urlbuf_var=urlbuf_varpart;
|
||||
client_hoststr=hoststr;
|
||||
browsertype=0;
|
||||
|
|
@ -1272,19 +1262,19 @@ void client_browse_url(const prog_char *urlbuf,const char *urlbuf_varpart,const
|
|||
}
|
||||
|
||||
// client web browser using http POST operation:
|
||||
// additionalheaderline must be set to NULL if not used.
|
||||
// additionalheaderline_p must be set to NULL if not used.
|
||||
// The string buffers to which urlbuf_varpart and hoststr are pointing
|
||||
// must not be changed until the callback is executed.
|
||||
// postval is a string buffer which can only be de-allocated by the caller
|
||||
// when the post operation was really done (e.g when callback was executed).
|
||||
// postval must be urlencoded.
|
||||
void client_http_post(const prog_char *urlbuf, const char *urlbuf_varpart,const char *hoststr, const prog_char *additionalheaderline,char *postval,void (*callback)(uint16_t,uint16_t,uint16_t),uint8_t *dstip,uint8_t *dstmac)
|
||||
void client_http_post(const char *urlbuf_p, char *urlbuf_varpart,const char *hoststr, const char *additionalheaderline_p,char *postval,void (*callback)(uint16_t,uint16_t,uint16_t),uint8_t *dstip,uint8_t *dstmac)
|
||||
{
|
||||
if (!enc28j60linkup())return;
|
||||
client_urlbuf=urlbuf;
|
||||
client_urlbuf_p=urlbuf_p;
|
||||
client_hoststr=hoststr;
|
||||
client_urlbuf_var=urlbuf_varpart;
|
||||
client_additionalheaderline=additionalheaderline;
|
||||
client_additionalheaderline_p=additionalheaderline_p;
|
||||
client_postval=postval;
|
||||
browsertype=1;
|
||||
client_browser_callback=callback;
|
||||
|
|
@ -1318,7 +1308,7 @@ uint8_t packetloop_icmp_checkreply(uint8_t *buf,uint8_t *ip_monitoredhost)
|
|||
// of the tcp data if there is tcp data part
|
||||
uint16_t packetloop_arp_icmp_tcp(uint8_t *buf,uint16_t plen)
|
||||
{
|
||||
// uint16_t len;
|
||||
uint16_t len;
|
||||
#if defined (TCP_client)
|
||||
uint8_t send_fin=0;
|
||||
uint16_t tcpstart;
|
||||
|
|
@ -1379,13 +1369,13 @@ uint16_t packetloop_arp_icmp_tcp(uint8_t *buf,uint16_t plen)
|
|||
(*icmp_callback)(&(buf[IP_SRC_P]));
|
||||
}
|
||||
// a ping packet, let's send pong
|
||||
debugstr("Sending ping reply...");
|
||||
debugcrlf();
|
||||
debugstr("Replying to ping..."); debugcrlf();
|
||||
make_echo_reply_from_request(buf,plen);
|
||||
return(0);
|
||||
}
|
||||
if (plen<54 && buf[IP_PROTO_P]!=IP_PROTO_TCP_V ){
|
||||
// smaller than the smallest TCP packet and not tcp port
|
||||
// this is an important check to avoid working on the wrong packets:
|
||||
if (plen<54 || buf[IP_PROTO_P]!=IP_PROTO_TCP_V ){
|
||||
// smaller than the smallest TCP packet (TCP packet with no options section) or not tcp port
|
||||
return(0);
|
||||
}
|
||||
#if defined (TCP_client)
|
||||
|
|
@ -1404,7 +1394,7 @@ uint16_t packetloop_arp_icmp_tcp(uint8_t *buf,uint16_t plen)
|
|||
// parameters in client_tcp_result_callback: fd, status, buf_start, len
|
||||
(*client_tcp_result_callback)((buf[TCP_DST_PORT_L_P]>>5)&0x7,3,0,0);
|
||||
}
|
||||
tcp_client_state=5;
|
||||
tcp_client_state=6;
|
||||
return(0);
|
||||
}
|
||||
len=get_tcp_data_len(buf);
|
||||
|
|
@ -1470,11 +1460,25 @@ uint16_t packetloop_arp_icmp_tcp(uint8_t *buf,uint16_t plen)
|
|||
}
|
||||
}
|
||||
if(tcp_client_state==5){
|
||||
// no more ack
|
||||
// we get one more final ack to our fin-ack:
|
||||
if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V){
|
||||
tcp_client_state=6; // in state 6 communication should be finished
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
if(tcp_client_state==6){
|
||||
// something wrong, can't deal with this, reset the connection
|
||||
len++;
|
||||
if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V) len=0; // if packet was an ack then do not step the ack number
|
||||
make_tcp_ack_from_any(buf,len,TCP_FLAGS_RST_V);
|
||||
// just a single reset, do not repeat if more messages:
|
||||
tcp_client_state=7;
|
||||
return(0);
|
||||
}
|
||||
if (buf[TCP_FLAGS_P] & TCP_FLAGS_FIN_V){
|
||||
make_tcp_ack_from_any(buf,len+1,TCP_FLAGS_PUSH_V|TCP_FLAGS_FIN_V);
|
||||
// this normally a fin ack message but it could be
|
||||
// any message with fin we answer with fin-ack:
|
||||
make_tcp_ack_from_any(buf,len+1,TCP_FLAGS_FIN_V);
|
||||
tcp_client_state=5; // connection terminated
|
||||
return(0);
|
||||
}
|
||||
|
|
@ -1490,7 +1494,7 @@ uint16_t packetloop_arp_icmp_tcp(uint8_t *buf,uint16_t plen)
|
|||
//
|
||||
#ifdef WWW_server
|
||||
// tcp port web server start
|
||||
if (buf[IP_PROTO_P]==IP_PROTO_TCP_V && buf[TCP_DST_PORT_H_P]==wwwport_h && buf[TCP_DST_PORT_L_P]==wwwport_l){
|
||||
if (buf[TCP_DST_PORT_H_P]==wwwport_h && buf[TCP_DST_PORT_L_P]==wwwport_l){
|
||||
if (buf[TCP_FLAGS_P] & TCP_FLAGS_SYN_V){
|
||||
make_tcp_synack_from_syn(buf);
|
||||
// make_tcp_synack_from_syn does already send the syn,ack
|
||||
|
|
@ -12,10 +12,6 @@
|
|||
#ifndef IP_ARP_UDP_TCP_H
|
||||
#define IP_ARP_UDP_TCP_H 1
|
||||
|
||||
#include "net.h"
|
||||
#include "../net/enc28j60.h"
|
||||
#include "../kernel/kernel.h"
|
||||
#include "../include/fb.h"
|
||||
#include "ip_config.h"
|
||||
|
||||
// set my own mac address:
|
||||
|
|
@ -22,7 +22,7 @@
|
|||
// a server answering to UDP messages
|
||||
#define UDP_server
|
||||
// a web server
|
||||
#undef WWW_server
|
||||
#define WWW_server
|
||||
|
||||
// to send out a ping:
|
||||
#undef PING_client
|
||||
|
|
@ -1,63 +0,0 @@
|
|||
Writing a "bare metal" operating system for Raspberry Pi 4 (Part 15)
|
||||
====================================================================
|
||||
|
||||
Adding a TCP/IP stack
|
||||
---------------------
|
||||
Having achieved "proof of life" from our Ethernet module in _part14-spi-ethernet_, you're doubtless wondering how to go from there to serving web pages, posting tweets on Twitter or perhaps even just simply responding to a ping!
|
||||
|
||||
This is where you'll need a fully-fledged TCP/IP stack that goes way beyond handcrafted ARPs, implementing many more protocols to achieve efficient bi-directional communication.
|
||||
|
||||
In this part we make use of some code from Guido Socher of [tuxgraphics.org](http://tuxgraphics.org/), designed to be a lightweight TCP/IP stack for embedded devices. I chose this because it was super simple to get working (or "port"), but you might want to look at [LwIP](https://en.wikipedia.org/wiki/LwIP) if you need something more advanced.
|
||||
|
||||
The code
|
||||
--------
|
||||
Most of the new code is in the _tcpip/_ subdirectory. I actually came across it in [this Github repository](https://github.com/ussserrr/maglev-ti-rtos) and, again, made only a very few cosmetic changes (`diff` is your friend!).
|
||||
|
||||
It did require me to expose the `strlen()` function we implemented in _lib/fb.c_, so that's added to _include/fb.h_. Similarly, we expose the `memcpy()` function we implemented in _kernel/kernel.c_, so that's added to _kernel/kernel.h_.
|
||||
|
||||
I also needed a single function that tells the ENC to send a packet. Nothing new here, just different packaging:
|
||||
|
||||
```c
|
||||
void enc28j60PacketSend(unsigned short buflen, void *buffer) {
|
||||
if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
|
||||
ENC_WriteBuffer((unsigned char *) buffer, buflen);
|
||||
handle.transmitLength = buflen;
|
||||
ENC_Transmit(&handle);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
This was also added to _kernel/kernel.h_. Finally, _kernel/kernel.c_ now calls a function called `net_test()` instead of our original `arp_test()`.
|
||||
|
||||
The changes to _arp.c_
|
||||
----------------------
|
||||
We initialise the network card in exactly the same way but, when we're done, we call this function in Guido's code:
|
||||
|
||||
```c
|
||||
init_udp_or_www_server(myMAC, deviceIP);
|
||||
```
|
||||
|
||||
This tells the TCP/IP library who we are, so we're all on the same page!
|
||||
|
||||
Finally, and aside from a little cleanup, the major change is the new `net_test()` function:
|
||||
|
||||
```c
|
||||
void net_test(void)
|
||||
{
|
||||
while (1) {
|
||||
while (!ENC_GetReceivedFrame(&handle));
|
||||
|
||||
uint16_t len = handle.RxFrameInfos.length;
|
||||
uint8_t *buffer = (uint8_t *)handle.RxFrameInfos.buffer;
|
||||
packetloop_arp_icmp_tcp(buffer, len);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
This is an infinite loop which waits for an incoming packet and then simply passes it to Guido's `packetloop_arp_icmp_tcp()` function. This function implements some useful things, like responding to pings. I modified the routine to print a message to the screen when it sends a "pong" (look from line 1381 of _tcpip/ip_arp_udp_tcp.c_), so we can see when it's in action!
|
||||
|
||||
_Imagine my excitement when I built, ran and could ping my RPi4 at 192.168.0.66 and get a response to both my laptop and my iPhone!_
|
||||
|
||||
I recommend reading [this page](http://tuxgraphics.org/electronics/200905/embedded-tcp-ip-stack.shtml) to give you some ideas about what else you might achieve with Guido's library...
|
||||
|
||||
|
||||
|
|
@ -1,27 +0,0 @@
|
|||
#include "kernel.h"
|
||||
|
||||
void enable_interrupt_controller() {
|
||||
REGS_IRQ->irq0_enable_0 = SYS_TIMER_IRQ_1 | SYS_TIMER_IRQ_3;
|
||||
}
|
||||
|
||||
void disable_interrupt_controller() {
|
||||
REGS_IRQ->irq0_enable_0 = 0;
|
||||
}
|
||||
|
||||
void handle_irq() {
|
||||
unsigned int irq = REGS_IRQ->irq0_pending_0;
|
||||
|
||||
while(irq) {
|
||||
if (irq & SYS_TIMER_IRQ_1) {
|
||||
irq &= ~SYS_TIMER_IRQ_1;
|
||||
|
||||
handle_timer_1();
|
||||
}
|
||||
|
||||
if (irq & SYS_TIMER_IRQ_3) {
|
||||
irq &= ~SYS_TIMER_IRQ_3;
|
||||
|
||||
handle_timer_3();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,160 +0,0 @@
|
|||
#define SYNC_INVALID_EL1t 0
|
||||
#define IRQ_INVALID_EL1t 1
|
||||
#define FIQ_INVALID_EL1t 2
|
||||
#define ERROR_INVALID_EL1t 3
|
||||
|
||||
#define SYNC_INVALID_EL1h 4
|
||||
#define IRQ_INVALID_EL1h 5
|
||||
#define FIQ_INVALID_EL1h 6
|
||||
#define ERROR_INVALID_EL1h 7
|
||||
|
||||
#define SYNC_INVALID_EL0_64 8
|
||||
#define IRQ_INVALID_EL0_64 9
|
||||
#define FIQ_INVALID_EL0_64 10
|
||||
#define ERROR_INVALID_EL0_64 11
|
||||
|
||||
#define SYNC_INVALID_EL0_32 12
|
||||
#define IRQ_INVALID_EL0_32 13
|
||||
#define FIQ_INVALID_EL0_32 14
|
||||
#define ERROR_INVALID_EL0_32 15
|
||||
|
||||
//stack frame size
|
||||
#define S_FRAME_SIZE 256
|
||||
|
||||
.macro kernel_entry
|
||||
sub sp, sp, #S_FRAME_SIZE
|
||||
stp x0, x1, [sp, #16 * 0]
|
||||
stp x2, x3, [sp, #16 * 1]
|
||||
stp x4, x5, [sp, #16 * 2]
|
||||
stp x6, x7, [sp, #16 * 3]
|
||||
stp x8, x9, [sp, #16 * 4]
|
||||
stp x10, x11, [sp, #16 * 5]
|
||||
stp x12, x13, [sp, #16 * 6]
|
||||
stp x14, x15, [sp, #16 * 7]
|
||||
stp x16, x17, [sp, #16 * 8]
|
||||
stp x18, x19, [sp, #16 * 9]
|
||||
stp x20, x21, [sp, #16 * 10]
|
||||
stp x22, x23, [sp, #16 * 11]
|
||||
stp x24, x25, [sp, #16 * 12]
|
||||
stp x26, x27, [sp, #16 * 13]
|
||||
stp x28, x29, [sp, #16 * 14]
|
||||
str x30, [sp, #16 * 15]
|
||||
.endm
|
||||
|
||||
.macro kernel_exit
|
||||
ldp x0, x1, [sp, #16 * 0]
|
||||
ldp x2, x3, [sp, #16 * 1]
|
||||
ldp x4, x5, [sp, #16 * 2]
|
||||
ldp x6, x7, [sp, #16 * 3]
|
||||
ldp x8, x9, [sp, #16 * 4]
|
||||
ldp x10, x11, [sp, #16 * 5]
|
||||
ldp x12, x13, [sp, #16 * 6]
|
||||
ldp x14, x15, [sp, #16 * 7]
|
||||
ldp x16, x17, [sp, #16 * 8]
|
||||
ldp x18, x19, [sp, #16 * 9]
|
||||
ldp x20, x21, [sp, #16 * 10]
|
||||
ldp x22, x23, [sp, #16 * 11]
|
||||
ldp x24, x25, [sp, #16 * 12]
|
||||
ldp x26, x27, [sp, #16 * 13]
|
||||
ldp x28, x29, [sp, #16 * 14]
|
||||
ldr x30, [sp, #16 * 15]
|
||||
add sp, sp, #S_FRAME_SIZE
|
||||
eret
|
||||
.endm
|
||||
|
||||
.macro handle_invalid_entry type
|
||||
kernel_entry
|
||||
mov x0, #\type
|
||||
mrs x1, esr_el1
|
||||
mrs x2, elr_el1
|
||||
|
||||
// We could pass this to a function to print an error here
|
||||
// e.g. bl show_invalid_entry_message
|
||||
//
|
||||
// For now we'll just hang
|
||||
|
||||
b err_hang
|
||||
.endm
|
||||
|
||||
.macro ventry label
|
||||
.align 7
|
||||
b \label
|
||||
.endm
|
||||
|
||||
//Exception vectors table
|
||||
.align 11
|
||||
.globl vectors
|
||||
vectors:
|
||||
ventry sync_invalid_el1t // Synchronous EL1t
|
||||
ventry irq_invalid_el1t // IRQ EL1t
|
||||
ventry fiq_invalid_el1t // FIQ EL1t
|
||||
ventry error_invalid_el1t // Error EL1t
|
||||
|
||||
ventry sync_invalid_el1h // Synchronous EL1h
|
||||
ventry handle_el1_irq // IRQ EL1h
|
||||
ventry fiq_invalid_el1h // FIQ EL1h
|
||||
ventry error_invalid_el1h // Error EL1h
|
||||
|
||||
ventry sync_invalid_el0_64 // Synchronous 64-bit EL0
|
||||
ventry irq_invalid_el0_64 // IRQ 64-bit EL0
|
||||
ventry fiq_invalid_el0_64 // FIQ 64-bit EL0
|
||||
ventry error_invalid_el0_64 // Error 64-bit EL0
|
||||
|
||||
ventry sync_invalid_el0_32 // Synchronous 32-bit EL0
|
||||
ventry irq_invalid_el0_32 // IRQ 32-bit EL0
|
||||
ventry fiq_invalid_el0_32 // FIQ 32-bit EL0
|
||||
ventry error_invalid_el0_32 // Error 32-bit EL0
|
||||
|
||||
|
||||
sync_invalid_el1t:
|
||||
handle_invalid_entry SYNC_INVALID_EL1t
|
||||
|
||||
irq_invalid_el1t:
|
||||
handle_invalid_entry IRQ_INVALID_EL1t
|
||||
|
||||
fiq_invalid_el1t:
|
||||
handle_invalid_entry FIQ_INVALID_EL1t
|
||||
|
||||
error_invalid_el1t:
|
||||
handle_invalid_entry ERROR_INVALID_EL1t
|
||||
|
||||
sync_invalid_el1h:
|
||||
handle_invalid_entry SYNC_INVALID_EL1h
|
||||
|
||||
fiq_invalid_el1h:
|
||||
handle_invalid_entry FIQ_INVALID_EL1h
|
||||
|
||||
error_invalid_el1h:
|
||||
handle_invalid_entry ERROR_INVALID_EL1h
|
||||
|
||||
sync_invalid_el0_64:
|
||||
handle_invalid_entry SYNC_INVALID_EL0_64
|
||||
|
||||
irq_invalid_el0_64:
|
||||
handle_invalid_entry IRQ_INVALID_EL0_64
|
||||
|
||||
fiq_invalid_el0_64:
|
||||
handle_invalid_entry FIQ_INVALID_EL0_64
|
||||
|
||||
error_invalid_el0_64:
|
||||
handle_invalid_entry ERROR_INVALID_EL0_64
|
||||
|
||||
sync_invalid_el0_32:
|
||||
handle_invalid_entry SYNC_INVALID_EL0_32
|
||||
|
||||
irq_invalid_el0_32:
|
||||
handle_invalid_entry IRQ_INVALID_EL0_32
|
||||
|
||||
fiq_invalid_el0_32:
|
||||
handle_invalid_entry FIQ_INVALID_EL0_32
|
||||
|
||||
error_invalid_el0_32:
|
||||
handle_invalid_entry ERROR_INVALID_EL0_32
|
||||
|
||||
handle_el1_irq:
|
||||
kernel_entry
|
||||
bl handle_irq
|
||||
kernel_exit
|
||||
|
||||
.globl err_hang
|
||||
err_hang: b err_hang
|
||||
|
|
@ -1,167 +0,0 @@
|
|||
#include "../include/fb.h"
|
||||
#include "../include/io.h"
|
||||
#include "../include/spi.h"
|
||||
#include "../include/multicore.h"
|
||||
#include "kernel.h"
|
||||
|
||||
void initProgress(void)
|
||||
{
|
||||
drawRect(0, 0, 301, 50, 0x0f, 0);
|
||||
drawString(309, 21, "Core 0", 0x0f, 1);
|
||||
|
||||
drawRect(0, 60, 301, 110, 0x0f, 0);
|
||||
drawString(309, 81, "Core 1", 0x0f, 1);
|
||||
|
||||
drawRect(0, 120, 301, 170, 0x0f, 0);
|
||||
drawString(309, 141, "Timer 1", 0x0f, 1);
|
||||
|
||||
drawRect(0, 180, 301, 230, 0x0f, 0);
|
||||
drawString(309, 201, "Timer 3", 0x0f, 1);
|
||||
}
|
||||
|
||||
void drawProgress(unsigned int core, unsigned int val) {
|
||||
unsigned char col = (core + 1) + ((core + 1) << 4);
|
||||
|
||||
// val should be 0-100
|
||||
if (val == 0) drawRect(1, (60 * core) + 1, 300, (60 * core) + 49, 0x00, 1);
|
||||
if (val > 0) drawRect(1, (60 * core) + 1, (val * 3), (60 * core) + 49, col, 1);
|
||||
}
|
||||
|
||||
void core3_main(void) {
|
||||
clear_core3(); // Only run once
|
||||
|
||||
// Test the network card
|
||||
|
||||
spi_init();
|
||||
init_network();
|
||||
net_test();
|
||||
|
||||
while(1);
|
||||
}
|
||||
|
||||
void core0_main(void)
|
||||
{
|
||||
unsigned int core0_val = 0;
|
||||
|
||||
while (core0_val <= 100) {
|
||||
wait_msec(0x100000);
|
||||
drawProgress(0, core0_val);
|
||||
core0_val++;
|
||||
}
|
||||
|
||||
debugstr("Core 0 done.");
|
||||
debugcrlf();
|
||||
}
|
||||
|
||||
void core1_main(void)
|
||||
{
|
||||
unsigned int core1_val = 0;
|
||||
|
||||
clear_core1(); // Only run once
|
||||
|
||||
while (core1_val <= 100) {
|
||||
wait_msec(0x3FFFF);
|
||||
drawProgress(1, core1_val);
|
||||
core1_val++;
|
||||
}
|
||||
|
||||
debugstr("Core 1 done.");
|
||||
debugcrlf();
|
||||
|
||||
while(1);
|
||||
}
|
||||
|
||||
// TIMER FUNCTIONS
|
||||
|
||||
const unsigned int timer1_int = CLOCKHZ;
|
||||
const unsigned int timer3_int = CLOCKHZ / 4;
|
||||
unsigned int timer1_val = 0;
|
||||
unsigned int timer3_val = 0;
|
||||
|
||||
void timer_init() {
|
||||
timer1_val = REGS_TIMER->counter_lo;
|
||||
timer1_val += timer1_int;
|
||||
REGS_TIMER->compare[1] = timer1_val;
|
||||
|
||||
timer3_val = REGS_TIMER->counter_lo;
|
||||
timer3_val += timer3_int;
|
||||
REGS_TIMER->compare[3] = timer3_val;
|
||||
}
|
||||
|
||||
void handle_timer_1() {
|
||||
timer1_val += timer1_int;
|
||||
REGS_TIMER->compare[1] = timer1_val;
|
||||
REGS_TIMER->control_status |= SYS_TIMER_IRQ_1;
|
||||
|
||||
unsigned int progval = timer1_val / timer1_int;
|
||||
if (progval <= 100) {
|
||||
drawProgress(2, progval);
|
||||
} else {
|
||||
debugstr("Timer 1 done.");
|
||||
debugcrlf();
|
||||
}
|
||||
}
|
||||
|
||||
void handle_timer_3() {
|
||||
timer3_val += timer3_int;
|
||||
REGS_TIMER->compare[3] = timer3_val;
|
||||
REGS_TIMER->control_status |= SYS_TIMER_IRQ_3;
|
||||
|
||||
unsigned int progval = timer3_val / timer3_int;
|
||||
if (progval <= 100) drawProgress(3, progval);
|
||||
}
|
||||
|
||||
unsigned long HAL_GetTick(void) {
|
||||
unsigned int hi = REGS_TIMER->counter_hi;
|
||||
unsigned int lo = REGS_TIMER->counter_lo;
|
||||
|
||||
//double check hi value didn't change after setting it...
|
||||
if (hi != REGS_TIMER->counter_hi) {
|
||||
hi = REGS_TIMER->counter_hi;
|
||||
lo = REGS_TIMER->counter_lo;
|
||||
}
|
||||
|
||||
return ((unsigned long)hi << 32) | lo;
|
||||
}
|
||||
|
||||
void HAL_Delay(unsigned int ms) {
|
||||
unsigned long start = HAL_GetTick();
|
||||
|
||||
while(HAL_GetTick() < start + (ms * 1000));
|
||||
}
|
||||
|
||||
void main(void)
|
||||
{
|
||||
fb_init();
|
||||
|
||||
unsigned int i=0;
|
||||
while (i++<30) debugcrlf();
|
||||
|
||||
initProgress();
|
||||
|
||||
// Kick it off on core 1
|
||||
|
||||
start_core1(core1_main);
|
||||
|
||||
// Kick off the timers
|
||||
|
||||
irq_init_vectors();
|
||||
enable_interrupt_controller();
|
||||
irq_enable();
|
||||
timer_init();
|
||||
|
||||
// Kick it off on core 3
|
||||
|
||||
start_core3(core3_main);
|
||||
|
||||
// Kick it off on core 0
|
||||
|
||||
core0_main();
|
||||
|
||||
// Disable IRQs and loop endlessly
|
||||
|
||||
irq_disable();
|
||||
disable_interrupt_controller();
|
||||
|
||||
while(1);
|
||||
}
|
||||
|
|
@ -1,51 +0,0 @@
|
|||
#define PERIPHERAL_BASE 0xFE000000
|
||||
#define CLOCKHZ 1000000
|
||||
|
||||
struct timer_regs {
|
||||
volatile unsigned int control_status;
|
||||
volatile unsigned int counter_lo;
|
||||
volatile unsigned int counter_hi;
|
||||
volatile unsigned int compare[4];
|
||||
};
|
||||
|
||||
#define REGS_TIMER ((struct timer_regs *)(PERIPHERAL_BASE + 0x00003000))
|
||||
|
||||
struct arm_irq_regs_2711 {
|
||||
volatile unsigned int irq0_pending_0;
|
||||
volatile unsigned int irq0_pending_1;
|
||||
volatile unsigned int irq0_pending_2;
|
||||
volatile unsigned int res0;
|
||||
volatile unsigned int irq0_enable_0;
|
||||
volatile unsigned int irq0_enable_1;
|
||||
volatile unsigned int irq0_enable_2;
|
||||
volatile unsigned int res1;
|
||||
volatile unsigned int irq0_disable_0;
|
||||
volatile unsigned int irq0_disable_1;
|
||||
volatile unsigned int irq0_disable_2;
|
||||
};
|
||||
|
||||
typedef struct arm_irq_regs_2711 arm_irq_regs;
|
||||
|
||||
#define REGS_IRQ ((arm_irq_regs *)(PERIPHERAL_BASE + 0x0000B200))
|
||||
|
||||
enum vc_irqs {
|
||||
SYS_TIMER_IRQ_0 = 1,
|
||||
SYS_TIMER_IRQ_1 = 2,
|
||||
SYS_TIMER_IRQ_2 = 4,
|
||||
SYS_TIMER_IRQ_3 = 8,
|
||||
AUX_IRQ = (1 << 29)
|
||||
};
|
||||
|
||||
void irq_init_vectors();
|
||||
void irq_enable();
|
||||
void irq_disable();
|
||||
void enable_interrupt_controller();
|
||||
void disable_interrupt_controller();
|
||||
|
||||
void handle_timer_1();
|
||||
void handle_timer_3();
|
||||
|
||||
void init_network(void);
|
||||
void net_test(void);
|
||||
void enc28j60PacketSend(unsigned short buflen, void *buffer);
|
||||
void *memcpy(void *dest, const void *src, unsigned short len);
|
||||
|
|
@ -1,15 +0,0 @@
|
|||
.globl irq_init_vectors
|
||||
irq_init_vectors:
|
||||
adr x0, vectors
|
||||
msr vbar_el1, x0
|
||||
ret
|
||||
|
||||
.globl irq_enable
|
||||
irq_enable:
|
||||
msr daifclr, #2
|
||||
ret
|
||||
|
||||
.globl irq_disable
|
||||
irq_disable:
|
||||
msr daifset, #2
|
||||
ret
|
||||
Loading…
Reference in a new issue