mirror of
https://github.com/isometimes/rpi4-osdev
synced 2024-09-19 21:32:58 +00:00
252 lines
8 KiB
C
252 lines
8 KiB
C
#include "io.h"
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#include "fb.h"
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// UART0
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enum {
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ARM_UART0_BASE = PERIPHERAL_BASE + 0x201000,
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ARM_UART0_DR = ARM_UART0_BASE + 0x00,
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ARM_UART0_FR = ARM_UART0_BASE + 0x18,
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ARM_UART0_IBRD = ARM_UART0_BASE + 0x24,
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ARM_UART0_FBRD = ARM_UART0_BASE + 0x28,
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ARM_UART0_LCRH = ARM_UART0_BASE + 0x2C,
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ARM_UART0_CR = ARM_UART0_BASE + 0x30,
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ARM_UART0_IFLS = ARM_UART0_BASE + 0x34,
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ARM_UART0_IMSC = ARM_UART0_BASE + 0x38,
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ARM_UART0_RIS = ARM_UART0_BASE + 0x3C,
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ARM_UART0_MIS = ARM_UART0_BASE + 0x40,
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ARM_UART0_ICR = ARM_UART0_BASE + 0x44
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};
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unsigned char lo(unsigned int val) { return (unsigned char)(val & 0xff); }
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unsigned char hi(unsigned int val) { return (unsigned char)((val & 0xff00) >> 8); }
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unsigned int bt_isReadByteReady() { return (!(mmio_read(ARM_UART0_FR) & 0x10)); }
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unsigned char bt_readByte()
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{
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unsigned char ch = lo(mmio_read(ARM_UART0_DR));
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return ch;
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}
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unsigned char bt_waitReadByte()
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{
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while (!bt_isReadByteReady());
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return bt_readByte();
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}
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void bt_writeByte(char byte)
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{
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while ((mmio_read(ARM_UART0_FR) & 0x20) != 0);
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mmio_write(ARM_UART0_DR, (unsigned int)byte);
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uart_byte(byte);
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}
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void bt_flushrx()
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{
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while (bt_isReadByteReady()) bt_readByte();
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}
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void bt_init()
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{
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gpio_useAsAlt3(30);
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gpio_useAsAlt3(31);
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gpio_useAsAlt3(32);
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gpio_useAsAlt3(33);
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bt_flushrx();
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mmio_write(ARM_UART0_IMSC, 0x00);
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mmio_write(ARM_UART0_ICR, 0x7ff);
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mmio_write(ARM_UART0_IBRD, 0x1a);
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mmio_write(ARM_UART0_FBRD, 0x03);
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mmio_write(ARM_UART0_IFLS, 0x08);
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mmio_write(ARM_UART0_LCRH, 0x70);
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mmio_write(ARM_UART0_CR, 0xB01);
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mmio_write(ARM_UART0_IMSC, 0x430);
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wait_msec(0x100000);
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}
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// HOST SETUP
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enum {
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OGF_HOST_CONTROL = 0x03,
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OGF_LE_CONTROL = 0x08,
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OGF_VENDOR = 0x3f,
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COMMAND_SET_BDADDR = 0x01,
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COMMAND_RESET_CHIP = 0x03,
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COMMAND_SET_BAUD = 0x18,
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COMMAND_LOAD_FIRMWARE = 0x2e,
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HCI_COMMAND_PKT = 0x01,
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HCI_EVENT_PKT = 0x04,
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COMMAND_COMPLETE_CODE = 0x0e,
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LL_SCAN_ACTIVE = 0x01,
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LL_ADV_NONCONN_IND = 0x03
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};
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unsigned char empty[] = {};
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int hciCommandBytes(unsigned char *opcodebytes, unsigned char *data, unsigned char length)
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{
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unsigned char c=0;
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uart_writeText("HCI_START\n");
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bt_writeByte(HCI_COMMAND_PKT);
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bt_writeByte(opcodebytes[0]);
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bt_writeByte(opcodebytes[1]);
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bt_writeByte(length);
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uart_writeText("\n______ DATA:\n");
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while (c++<length) bt_writeByte(*data++);
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uart_writeText("\nHCI_END\n");
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if (bt_waitReadByte() != HCI_EVENT_PKT) return 0;
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if (bt_waitReadByte() != COMMAND_COMPLETE_CODE) return 0;
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if (bt_waitReadByte() != 4) return 0;
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if (bt_waitReadByte() == 0) return 0;
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if (bt_waitReadByte() != opcodebytes[0]) return 0;
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if (bt_waitReadByte() != opcodebytes[1]) return 0;
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if (bt_waitReadByte() != 0) return 0;
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return 1;
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}
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int hciCommand(unsigned short ogf, unsigned short ocf, unsigned char *data, unsigned char length)
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{
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unsigned short opcode = ogf << 10 | ocf;
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unsigned char opcodebytes[2] = { lo(opcode), hi(opcode) };
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return hciCommandBytes(opcodebytes, data, length);
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}
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void bt_reset() {
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if (!hciCommand(OGF_HOST_CONTROL, COMMAND_RESET_CHIP, empty, 0)) uart_writeText("bt_reset() failed\n");
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}
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void bt_loadfirmware()
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{
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if (!hciCommand(OGF_VENDOR, COMMAND_LOAD_FIRMWARE, empty, 0)) uart_writeText("loadFirmware() failed\n");
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extern unsigned char _binary_BCM4345C0_hcd_start[];
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extern unsigned char _binary_BCM4345C0_hcd_size[];
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unsigned int c=0;
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unsigned int size = (long)&_binary_BCM4345C0_hcd_size;
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while (c < size) {
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unsigned char opcodebytes[] = { _binary_BCM4345C0_hcd_start[c], _binary_BCM4345C0_hcd_start[c+1] };
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unsigned char length = _binary_BCM4345C0_hcd_start[c+2];
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unsigned char *data = &(_binary_BCM4345C0_hcd_start[c+3]);
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if (!hciCommandBytes(opcodebytes, data, length)) {
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uart_writeText("Firmware data load failed\n");
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break;
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}
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c += 3 + length;
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}
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wait_msec(0x100000);
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}
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void bt_setbaud()
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{
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static unsigned char params[] = { 0, 0, 0x00, 0xc2, 0x01, 0x00 }; // little endian, 115200
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if (!hciCommand(OGF_VENDOR, COMMAND_SET_BAUD, params, 6)) uart_writeText("bt_setbaud() failed\n");
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}
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void bt_setbdaddr()
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{
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static unsigned char params[] = { 0xee, 0xff, 0xc0, 0xee, 0xff, 0xc0 }; // reversed
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if (!hciCommand(OGF_VENDOR, COMMAND_SET_BDADDR, params, 6)) uart_writeText("bt_setbdaddr() failed\n");
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}
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void bt_getbdaddr(unsigned char *bdaddr) {
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bt_writeByte(HCI_COMMAND_PKT);
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bt_writeByte(0x09);
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bt_writeByte(0x10);
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bt_writeByte(0x00);
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if (bt_waitReadByte() != HCI_EVENT_PKT) return;
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if (bt_waitReadByte() != COMMAND_COMPLETE_CODE) return;
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if (bt_waitReadByte() != 0x0a) return;
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if (bt_waitReadByte() != 1) return;
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if (bt_waitReadByte() != 0x09) return;
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if (bt_waitReadByte() != 0x10) return;
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if (bt_waitReadByte() != 0x00) return;
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for (int c=0;c<6;c++) bdaddr[c] = bt_waitReadByte();
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}
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void setLEeventmask(unsigned char mask)
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{
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unsigned char params[] = { mask, 0, 0, 0, 0, 0, 0, 0 };
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if (!hciCommand(OGF_LE_CONTROL, 0x01, params, 8)) uart_writeText("setLEeventmask failed\n");
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}
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void setLEscanenable(unsigned char state, unsigned char duplicates) {
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unsigned char params[] = { state, duplicates };
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if (!hciCommand(OGF_LE_CONTROL, 0x0c, params, 2)) uart_writeText("setLEscanenable failed\n");
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}
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void setLEscanparameters(unsigned char type, unsigned char linterval, unsigned char hinterval, unsigned char lwindow, unsigned char hwindow, unsigned char own_address_type, unsigned char filter_policy) {
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unsigned char params[] = { type, linterval, hinterval, lwindow, hwindow, own_address_type, filter_policy };
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if (!hciCommand(OGF_LE_CONTROL, 0x0b, params, 7)) uart_writeText("setLEscanparameters failed\n");
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}
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void setLEadvertenable(unsigned char state) {
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unsigned char params[] = { state };
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uart_writeText("doing the HCIcommand\n");
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if (!hciCommand(OGF_LE_CONTROL, 0x0a, params, 1)) uart_writeText("setLEadvertenable failed\n");
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}
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void setLEadvertparameters(unsigned char type, unsigned char linterval_min, unsigned char hinterval_min, unsigned char linterval_max, unsigned char hinterval_max, unsigned char own_address_type, unsigned char filter_policy) {
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unsigned char params[16] = { linterval_min, hinterval_min, linterval_max, hinterval_max, type, own_address_type, 0, 0, 0, 0, 0, 0, 0, 0x07, filter_policy };
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uart_writeText("doing the HCIcommand\n");
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if (!hciCommand(OGF_LE_CONTROL, 0x06, params, 15)) uart_writeText("setLEadvertparameters failed\n");
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}
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void setLEadvertdata() {
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static unsigned char params[] = { 0x19,
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0x02, 0x01, 0x06,
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0x03, 0x03, 0xAA, 0xFE,
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0x11, 0x16, 0xAA, 0xFE, 0x10, 0x00, 0x03, 0x69, 0x73, 0x6f, 0x6d, 0x65, 0x74, 0x69, 0x6d, 0x2e, 0x65, 0x73,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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if (!hciCommand(OGF_LE_CONTROL, 0x08, params, 32)) uart_writeText("setLEadvertdata failed\n");
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}
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void stopScanning() {
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setLEscanenable(0, 0);
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}
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void stopAdvertising() {
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setLEadvertenable(0);
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}
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void startActiveScanning() {
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float BleScanUnitsPerSecond = 1600;
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float BleScanInterval = 0.8;
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float BleScanWindow = 0.4;
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unsigned int p = BleScanInterval * BleScanUnitsPerSecond;
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unsigned int q = BleScanWindow * BleScanUnitsPerSecond;
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setLEscanparameters(LL_SCAN_ACTIVE, lo(p), hi(p), lo(q), hi(q), 0, 0);
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setLEscanenable(1, 0);
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}
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void startActiveAdvertising() {
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float advertMinFreq = 100; // every 48ms
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float advertMaxFreq = 100; // every 48ms
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float bleGranularity = 0.625;
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unsigned int min_interval = advertMinFreq / bleGranularity;
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unsigned int max_interval = advertMaxFreq / bleGranularity;
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setLEadvertparameters(LL_ADV_NONCONN_IND, lo(min_interval), hi(min_interval), lo(max_interval), hi(max_interval), 0, 0);
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setLEadvertdata();
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setLEadvertenable(1);
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}
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