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- /*
- * Driver for Analog Devices ADXL345 accelerometer.
- *
- * 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 adxl345_i2c_id = 0;
- static const uint8_t adxl345_i2c_addr = 0x53;
- 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, adxl345_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, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
- ret = platform_i2c_recv_byte(id, 0);
- platform_i2c_send_stop(id);
- return ret;
- }
- static int ICACHE_FLASH_ATTR adxl345_init(lua_State* L) {
- uint32_t sda;
- uint32_t scl;
- uint8_t devid;
- 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(adxl345_i2c_id, sda, scl, PLATFORM_I2C_SPEED_SLOW);
-
- devid = r8u(adxl345_i2c_id, 0x00);
- if (devid != 229) {
- return luaL_error(L, "device not found");
- }
- // Enable sensor
- platform_i2c_send_start(adxl345_i2c_id);
- platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
- platform_i2c_send_byte(adxl345_i2c_id, 0x2D);
- platform_i2c_send_byte(adxl345_i2c_id, 0x08);
- platform_i2c_send_stop(adxl345_i2c_id);
- return 0;
- }
- static int ICACHE_FLASH_ATTR adxl345_read(lua_State* L) {
- uint8_t data[6];
- int x,y,z;
- int i;
- platform_i2c_send_start(adxl345_i2c_id);
- platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
- platform_i2c_send_byte(adxl345_i2c_id, 0x32);
- platform_i2c_send_start(adxl345_i2c_id);
- platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
- for (i=0; i<5; i++) {
- data[i] = platform_i2c_recv_byte(adxl345_i2c_id, 1);
- }
-
- data[5] = platform_i2c_recv_byte(adxl345_i2c_id, 0);
- platform_i2c_send_stop(adxl345_i2c_id);
- x = (int16_t) ((data[1] << 8) | data[0]);
- y = (int16_t) ((data[3] << 8) | data[2]);
- z = (int16_t) ((data[5] << 8) | data[4]);
- lua_pushinteger(L, x);
- lua_pushinteger(L, y);
- lua_pushinteger(L, z);
- return 3;
- }
- static const LUA_REG_TYPE adxl345_map[] = {
- { LSTRKEY( "read" ), LFUNCVAL( adxl345_read )},
- { LSTRKEY( "init" ), LFUNCVAL( adxl345_init )},
- { LNILKEY, LNILVAL}
- };
- NODEMCU_MODULE(ADXL345, "adxl345", adxl345_map, NULL);
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