96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
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/*
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* Driver for Analog Devices ADXL345 accelerometer.
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*
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* Code based on BMP085 driver.
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*/
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#include "module.h"
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#include "lauxlib.h"
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#include "platform.h"
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#include "c_stdlib.h"
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#include "c_string.h"
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static const uint32_t adxl345_i2c_id = 0;
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static const uint8_t adxl345_i2c_addr = 0x53;
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static uint8_t ICACHE_FLASH_ATTR r8u(uint32_t id, uint8_t reg) {
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uint8_t ret;
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platform_i2c_send_start(id);
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platform_i2c_send_address(id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
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platform_i2c_send_byte(id, reg);
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platform_i2c_send_stop(id);
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platform_i2c_send_start(id);
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platform_i2c_send_address(id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
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ret = platform_i2c_recv_byte(id, 0);
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platform_i2c_send_stop(id);
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return ret;
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}
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static int ICACHE_FLASH_ATTR adxl345_init(lua_State* L) {
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uint32_t sda;
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uint32_t scl;
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uint8_t devid;
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sda = luaL_checkinteger(L, 1);
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scl = luaL_checkinteger(L, 2);
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luaL_argcheck(L, sda > 0 && scl > 0, 1, "no i2c for D0");
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platform_i2c_setup(adxl345_i2c_id, sda, scl, PLATFORM_I2C_SPEED_SLOW);
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devid = r8u(adxl345_i2c_id, 0x00);
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if (devid != 229) {
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return luaL_error(L, "device not found");
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}
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// Enable sensor
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platform_i2c_send_start(adxl345_i2c_id);
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platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
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platform_i2c_send_byte(adxl345_i2c_id, 0x2D);
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platform_i2c_send_byte(adxl345_i2c_id, 0x08);
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platform_i2c_send_stop(adxl345_i2c_id);
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return 0;
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}
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static int ICACHE_FLASH_ATTR adxl345_read(lua_State* L) {
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uint8_t data[6];
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int x,y,z;
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int i;
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platform_i2c_send_start(adxl345_i2c_id);
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platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
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platform_i2c_send_byte(adxl345_i2c_id, 0x32);
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platform_i2c_send_start(adxl345_i2c_id);
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platform_i2c_send_address(adxl345_i2c_id, adxl345_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
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for (i=0; i<5; i++) {
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data[i] = platform_i2c_recv_byte(adxl345_i2c_id, 1);
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}
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data[5] = platform_i2c_recv_byte(adxl345_i2c_id, 0);
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platform_i2c_send_stop(adxl345_i2c_id);
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x = (int16_t) ((data[1] << 8) | data[0]);
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y = (int16_t) ((data[3] << 8) | data[2]);
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z = (int16_t) ((data[5] << 8) | data[4]);
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lua_pushinteger(L, x);
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lua_pushinteger(L, y);
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lua_pushinteger(L, z);
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return 3;
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}
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static const LUA_REG_TYPE adxl345_map[] = {
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{ LSTRKEY( "read" ), LFUNCVAL( adxl345_read )},
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{ LSTRKEY( "init" ), LFUNCVAL( adxl345_init )},
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{ LNILKEY, LNILVAL}
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};
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NODEMCU_MODULE(ADXL345, "adxl345", adxl345_map, NULL);
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