rpi4-osdev/part12-wgt/wgt/mouse.c

276 lines
6.3 KiB
C
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#include "../include/wgt.h"
#include "../include/multicore.h"
#include "../include/io.h"
#include "../include/bt.h"
#define MAX_MSG_LEN 50
#define MAX_READ_RUN 100
unsigned char data_buf[MAX_MSG_LEN];
unsigned int data_len;
unsigned int messages_received = 0;
unsigned int poll_state = 0;
enum {
LE_EVENT_CODE = 0x3e,
LE_CONNECT_CODE = 0x01,
LE_ADREPORT_CODE = 0x02,
HCI_ACL_PKT = 0x02,
HCI_EVENT_PKT = 0x04
};
unsigned int got_echo_sid = 0;
unsigned int got_echo_name = 0;
unsigned char echo_addr[6];
unsigned int connected = 0;
unsigned int connection_handle = 0;
volatile unsigned int comms_up = 0;
/* Mouse variables */
volatile int but;
volatile int mx;
volatile int my;
/* Mouse boundaries */
int mbx1, mby1;
int mbx2, mby2;
void hci_poll2(unsigned char byte)
{
switch (poll_state) {
case 0:
if (byte != HCI_EVENT_PKT) poll_state = 0;
else poll_state = 1;
break;
case 1:
if (byte != LE_EVENT_CODE) poll_state = 0;
else poll_state = 2;
break;
case 2:
if (byte > MAX_MSG_LEN) poll_state = 0;
else {
poll_state = 3;
data_len = byte;
}
break;
default:
data_buf[poll_state - 3] = byte;
if (poll_state == data_len + 3 - 1) {
messages_received++;
poll_state = 0;
} else poll_state++;
}
}
unsigned char *hci_poll()
{
unsigned int goal = messages_received + 1;
if (bt_isReadByteReady()) {
unsigned int run = 0;
while (run < MAX_READ_RUN && messages_received < goal && bt_isReadByteReady()) {
unsigned char byte = bt_readByte();
hci_poll2(byte);
run++;
}
if (run == MAX_READ_RUN) return 0;
else return data_buf;
}
return 0;
}
void bt_search(void) {
unsigned char *buf;
while ( (buf = hci_poll()) ) {
if (data_len >= 2) {
if (buf[0] == LE_ADREPORT_CODE) {
if (buf[1] == 1) { // num_reports
if (buf[2] == 0) { // event_type
int bufindex = 0;
unsigned char ad_len = buf[11];
for (int c=9;c>=4;c--) echo_addr[9-c] = buf[bufindex + c]; // save the mac address
bufindex += 11;
got_echo_sid = 0; got_echo_name = 0; // Reset the search state machine
do {
ad_len = buf[bufindex];
unsigned char ad_type = buf[bufindex + 1];
bufindex += 2;
if (ad_len >= 2) {
if (ad_type == 0x03) {
unsigned int sid = buf[bufindex] | (buf[bufindex + 1] << 8);
if (sid == 0xEC00) {
got_echo_sid = 1;
}
} else if (ad_type == 0x09) {
char remote_name[ad_len - 1];
unsigned int d=0;
while (d<ad_len - 1) {
remote_name[d] = buf[bufindex + d];
d++;
}
if (!memcmp(remote_name,"echo",4)) {
got_echo_name = 1;
}
}
}
bufindex += ad_len - 1;
} while (bufindex < data_len);
}
}
}
}
}
}
void bt_conn()
{
unsigned char *buf;
while ( (buf = hci_poll()) ) {
if (!connected && data_len >= 2 && buf[0] == LE_CONNECT_CODE) {
connected = !*(buf+1);
connection_handle = *(buf+2) | (*(buf+3) << 8);
if (connected == 0) wait_msec(0x186A);
}
}
}
void acl_poll()
{
while (bt_isReadByteReady()) {
unsigned char byte = bt_waitReadByte();
if (byte == HCI_EVENT_PKT) {
bt_waitReadByte(); // opcode
unsigned char length = bt_waitReadByte();
for (int i=0;i<length;i++) bt_waitReadByte();
} else if (byte == HCI_ACL_PKT) {
unsigned char h1 = bt_waitReadByte(); // handle1
unsigned char h2 = bt_waitReadByte(); // handle2
unsigned char thandle = h1 | (h2 << 8);
unsigned char d1 = bt_waitReadByte();
unsigned char d2 = bt_waitReadByte();
unsigned int dlen = d1 | (d2 << 8);
unsigned char data[dlen];
for (int i=0;i<dlen;i++) data[i] = bt_waitReadByte();
if (dlen > 7) {
unsigned int length = data[0] | (data[1] << 8);
unsigned int channel = data[2] | (data[3] << 8);
unsigned char opcode = data[4];
if (thandle == connection_handle && opcode == 0x1b) {
#ifdef IOS_CONTROL
if (channel == 4 && data[5] == 0x3b && data[6] == 0x00) {
#else
if (channel == 4 && data[5] == 0x2a && data[6] == 0x00) {
#endif
if (length == 7) msetxy(data[7] | (data[8] << 8), data[9] | (data[10] << 8));
if (length == 5) msetbut(data[7], data[8]);
}
}
}
}
}
}
void msetbounds (short x1, short y1, short x2, short y2)
{
if (x1 < WGT_SYS.xres && x1 >= 0) {
if (x2 < WGT_SYS.xres && x2 >= x1) {
if (y1 < WGT_SYS.yres && y1 >= 0) {
if (y2 < WGT_SYS.yres && y2 >= y1) {
mbx1 = x1;
mbx2 = x2;
mby1 = y1;
mby2 = y2;
}
}
}
}
}
void msetbut (short event, short bnum) {
if (event == 1) { // Mouse down
but |= bnum;
} else if (event == 2) { // Mouse up
but ^= bnum;
}
}
void msetxy (short x, short y)
{
if (x < mbx1) x = mbx1;
if (y < mby1) y = mby1;
if (x > mbx2) x = mbx2;
if (y > mby2) y = mby2;
mx = x;
my = y;
}
void noclick()
{
if (but) while (but);
}
void mdeinit()
{
comms_up = 0;
}
void minit()
{
clear_core2();
// Initialise the UART
uart_init();
// Initialise the Bluetooth
bt_init();
bt_reset();
bt_loadfirmware();
bt_setbaud();
bt_setbdaddr();
// Start scanning
setLEeventmask(0xff);
startActiveScanning();
// Search for the echo
while (!(got_echo_sid && got_echo_name)) bt_search();
stopScanning();
// Connecting to echo
connect(echo_addr);
while (!(connected && connection_handle)) bt_conn();
// Subscribe to updates
sendACLsubscribe(connection_handle);
mx = WGT_SYS.xres / 2;
my = WGT_SYS.yres / 2;
mbx1 = 0;
mby1 = 0;
mbx2 = WGT_SYS.xres;
mby2 = WGT_SYS.yres;
but = 0;
comms_up = 1;
while (comms_up) acl_poll();
}