mirror of
https://github.com/nodemcu/nodemcu-firmware.git
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526d21dab4
The PR removed the bulk of non-newlib headers from the NodeMCU source base. app/libc has now been cut down to the bare minimum overrides to shadow the corresponding functions in the SDK's libc. The old c_xyz.h headerfiles have been nuked in favour of the standard <xyz.h> headers, with a few exceptions over in sdk-overrides. Again, shipping a libc.a without headers is a terrible thing to do. We're still living on a prayer that libc was configured the same was as a default-configured xtensa gcc toolchain assumes it is. That part I cannot do anything about, unfortunately, but it's no worse than it has been before. This enables our source files to compile successfully using the standard header files, and use the typical malloc()/calloc()/realloc()/free(), the strwhatever()s and memwhatever()s. These end up, through macro and linker magic, mapped to the appropriate SDK or ROM functions.
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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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 <stdlib.h>
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#include <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 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 adxl345_setup(lua_State* L) {
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uint8_t devid;
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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 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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LROT_BEGIN(adxl345)
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LROT_FUNCENTRY( read, adxl345_read )
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LROT_FUNCENTRY( setup, adxl345_setup )
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LROT_END( adxl345, NULL, 0 )
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NODEMCU_MODULE(ADXL345, "adxl345", adxl345, NULL);
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