rpi4-osdev/part7-bluetooth/kernel.c
2020-07-23 20:37:48 +01:00

122 lines
3.7 KiB
C

#include "io.h"
#include "fb.h"
#include "bt.h"
enum {
OGF_HOST_CONTROL = 0x03,
OGF_LE_CONTROL = 0x08,
OGF_VENDOR = 0x3f,
COMMAND_RESET_CHIP = 0x03,
VENDOR_LOAD_FIRMWARE = 0x2e,
HCI_COMMAND_PKT = 0x01,
HCI_EVENT_PKT = 0x04,
LL_SCAN_ACTIVE = 0x01,
EVENT_TYPE_COMMAND_STATUS = 0x0e
};
unsigned char lo(unsigned int val) { return (unsigned char)(val & 0xff); }
unsigned char hi(unsigned int val) { return (unsigned char)((val & 0xff00) >> 8); }
unsigned char empty[] = {};
int hciCommandBytes(unsigned char *opcodebytes, unsigned char *data, unsigned char length)
{
unsigned char c=0;
bt_writeByte(HCI_COMMAND_PKT);
bt_writeByte(opcodebytes[0]);
bt_writeByte(opcodebytes[1]);
bt_writeByte(length);
while (c++<length) bt_writeByte(*data++);
if (bt_waitReadByte() != HCI_EVENT_PKT) return 0;
if (bt_waitReadByte() != EVENT_TYPE_COMMAND_STATUS) return 0;
if (bt_waitReadByte() != 4) return 0;
if (bt_waitReadByte() == 0) return 0;
if (bt_waitReadByte() != opcodebytes[0]) return 0;
if (bt_waitReadByte() != opcodebytes[1]) return 0;
if (bt_waitReadByte() != 0) return 0;
return 1;
}
int hciCommand(unsigned short ogf, unsigned short ocf, unsigned char *data, unsigned char length)
{
unsigned short opcode = ogf << 10 | ocf;
unsigned char opcodebytes[2] = { lo(opcode), hi(opcode) };
return hciCommandBytes(opcodebytes, data, length);
}
void loadFirmware()
{
if (!hciCommand(OGF_VENDOR, VENDOR_LOAD_FIRMWARE, empty, 0)) uart_writeText("loadFirmware() failed\n");
extern unsigned char _binary_BCM4345C0_hcd_start[];
extern unsigned char _binary_BCM4345C0_hcd_size[];
unsigned int c=0;
unsigned int size = (long)&_binary_BCM4345C0_hcd_size;
while (c < size) {
unsigned char opcodebytes[] = { _binary_BCM4345C0_hcd_start[c], _binary_BCM4345C0_hcd_start[c+1] };
unsigned char length = _binary_BCM4345C0_hcd_start[c+2];
unsigned char *data = &(_binary_BCM4345C0_hcd_start[c+3]);
if (!hciCommandBytes(opcodebytes, data, length)) {
uart_writeText("Firmware data load failed\n");
break;
}
c += 3 + length;
}
wait_msec(0x100000);
}
void setLEeventmask(unsigned char mask)
{
unsigned char params[] = { mask, 0, 0, 0, 0, 0, 0, 0 };
if (!hciCommand(OGF_LE_CONTROL, 0x01, params, 8)) uart_writeText("setLEeventmask failed\n");
}
void setLEscanenable(unsigned char state, unsigned char duplicates) {
unsigned char params[] = { state, duplicates };
if (!hciCommand(OGF_LE_CONTROL, 0x0c, params, 2)) uart_writeText("setLEscanenable failed\n");
}
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) {
unsigned char params[] = { type, linterval, hinterval, lwindow, hwindow, own_address_type, filter_policy };
if (!hciCommand(OGF_LE_CONTROL, 0x0b, params, 7)) uart_writeText("setLEscanparameters failed\n");
}
void startActiveScanning() {
float BleScanUnitsPerSecond = 1600;
float BleScanInterval = 0.8;
float BleScanWindow = 0.4;
unsigned int p = BleScanInterval * BleScanUnitsPerSecond;
unsigned int q = BleScanWindow * BleScanUnitsPerSecond;
setLEscanparameters(LL_SCAN_ACTIVE, lo(p), hi(p), lo(q), hi(q), 0, 0);
setLEscanenable(1, 0);
}
void main()
{
fb_init();
uart_init();
bt_init();
uart_writeText("reset()\n");
if (!hciCommand(OGF_HOST_CONTROL, COMMAND_RESET_CHIP, empty, 0)) uart_writeText("reset() failed\n");
uart_writeText("loadfirmware()\n");
loadFirmware();
setLEeventmask(0xff);
startActiveScanning();
uart_writeText("Waiting for input...\n");
while (1) uart_update();
}