109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
|
/*
|
||
|
|
* Driver for Honeywell HMC5883L compass IC
|
||
|
|
*
|
||
|
|
* Code based on BMP085 driver.
|
||
|
|
*/
|
||
|
|
#include "module.h"
|
||
|
|
#include "lauxlib.h"
|
||
|
|
#include "platform.h"
|
||
|
|
#include "c_stdlib.h"
|
||
|
|
#include "c_string.h"
|
||
|
|
|
||
|
|
static const uint32_t hmc5883_i2c_id = 0;
|
||
|
|
static const uint8_t hmc5883_i2c_addr = 0x1E;
|
||
|
|
|
||
|
|
static uint8_t ICACHE_FLASH_ATTR r8u(uint32_t id, uint8_t reg) {
|
||
|
|
uint8_t ret;
|
||
|
|
|
||
|
|
platform_i2c_send_start(id);
|
||
|
|
platform_i2c_send_address(id, hmc5883_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
|
||
|
|
platform_i2c_send_byte(id, reg);
|
||
|
|
platform_i2c_send_stop(id);
|
||
|
|
platform_i2c_send_start(id);
|
||
|
|
platform_i2c_send_address(id, hmc5883_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
|
||
|
|
ret = platform_i2c_recv_byte(id, 0);
|
||
|
|
platform_i2c_send_stop(id);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ICACHE_FLASH_ATTR w8u(uint32_t id, uint8_t reg, uint8_t val) {
|
||
|
|
platform_i2c_send_start(hmc5883_i2c_id);
|
||
|
|
platform_i2c_send_address(hmc5883_i2c_id, hmc5883_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
|
||
|
|
platform_i2c_send_byte(hmc5883_i2c_id, reg);
|
||
|
|
platform_i2c_send_byte(hmc5883_i2c_id, val);
|
||
|
|
platform_i2c_send_stop(hmc5883_i2c_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ICACHE_FLASH_ATTR hmc5883_init(lua_State* L) {
|
||
|
|
|
||
|
|
uint32_t sda;
|
||
|
|
uint32_t scl;
|
||
|
|
uint8_t devid_a, devid_b, devid_c;
|
||
|
|
|
||
|
|
sda = luaL_checkinteger(L, 1);
|
||
|
|
scl = luaL_checkinteger(L, 2);
|
||
|
|
|
||
|
|
luaL_argcheck(L, sda > 0 && scl > 0, 1, "no i2c for D0");
|
||
|
|
|
||
|
|
platform_i2c_setup(hmc5883_i2c_id, sda, scl, PLATFORM_I2C_SPEED_SLOW);
|
||
|
|
|
||
|
|
devid_a = r8u(hmc5883_i2c_id, 10);
|
||
|
|
devid_b = r8u(hmc5883_i2c_id, 11);
|
||
|
|
devid_c = r8u(hmc5883_i2c_id, 12);
|
||
|
|
|
||
|
|
if ((devid_a != 0x48) || (devid_b != 0x34) || (devid_c != 0x33)) {
|
||
|
|
return luaL_error(L, "device not found");
|
||
|
|
}
|
||
|
|
|
||
|
|
// 8 sample average, 15 Hz update rate, normal measurement
|
||
|
|
w8u(hmc5883_i2c_id, 0x00, 0x70);
|
||
|
|
|
||
|
|
// Gain = 5
|
||
|
|
w8u(hmc5883_i2c_id, 0x01, 0xA0);
|
||
|
|
|
||
|
|
// Continuous measurement
|
||
|
|
w8u(hmc5883_i2c_id, 0x02, 0x00);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ICACHE_FLASH_ATTR hmc5883_read(lua_State* L) {
|
||
|
|
|
||
|
|
uint8_t data[6];
|
||
|
|
int x,y,z;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
platform_i2c_send_start(hmc5883_i2c_id);
|
||
|
|
platform_i2c_send_address(hmc5883_i2c_id, hmc5883_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
|
||
|
|
platform_i2c_send_byte(hmc5883_i2c_id, 0x03);
|
||
|
|
platform_i2c_send_stop(hmc5883_i2c_id);
|
||
|
|
platform_i2c_send_start(hmc5883_i2c_id);
|
||
|
|
platform_i2c_send_address(hmc5883_i2c_id, hmc5883_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
|
||
|
|
|
||
|
|
for (i=0; i<5; i++) {
|
||
|
|
data[i] = platform_i2c_recv_byte(hmc5883_i2c_id, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
data[5] = platform_i2c_recv_byte(hmc5883_i2c_id, 0);
|
||
|
|
|
||
|
|
platform_i2c_send_stop(hmc5883_i2c_id);
|
||
|
|
|
||
|
|
x = (int16_t) ((data[0] << 8) | data[1]);
|
||
|
|
y = (int16_t) ((data[2] << 8) | data[3]);
|
||
|
|
z = (int16_t) ((data[4] << 8) | data[5]);
|
||
|
|
|
||
|
|
lua_pushinteger(L, x);
|
||
|
|
lua_pushinteger(L, y);
|
||
|
|
lua_pushinteger(L, z);
|
||
|
|
|
||
|
|
return 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const LUA_REG_TYPE hmc5883_map[] = {
|
||
|
|
{ LSTRKEY( "read" ), LFUNCVAL( hmc5883_read )},
|
||
|
|
{ LSTRKEY( "init" ), LFUNCVAL( hmc5883_init )},
|
||
|
|
{ LNILKEY, LNILVAL}
|
||
|
|
};
|
||
|
|
|
||
|
|
NODEMCU_MODULE(HMC5883L, "hmc5883l", hmc5883_map, NULL);
|