357 lines
13 KiB
C
357 lines
13 KiB
C
// ***************************************************************************
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// TCS34725 module for ESP8266 with nodeMCU
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//
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// Written by K. Townsend (microBuilder.eu), Adapted for nodeMCU by Travis Howse (tjhowse gmail.com)
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//
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// BSD (see license.txt)
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// ***************************************************************************
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// Original header:
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/**************************************************************************/
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/*!
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@file tcs34725.c
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@author K. Townsend (microBuilder.eu)
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@ingroup Sensors
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@brief Driver for the TAOS TCS34725 I2C digital RGB/color sensor
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@license BSD (see license.txt)
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*/
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/**************************************************************************/
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//#define NODE_DEBUG
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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 "user_interface.h"
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#include <math.h>
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// #define TCS34725_ADDRESS (0x29<<1)
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#define TCS34725_ADDRESS (0x29)
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#define TCS34725_BUS_ID (0x00) /* ?? Not sure what this is for . Nodemcu I2C bus ID? */
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#define TCS34725_READBIT (0x01)
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#define TCS34725_COMMAND_BIT (0x80)
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#define TCS34725_ENABLE (0x00)
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#define TCS34725_ENABLE_AIEN (0x10) /* RGBC Interrupt Enable */
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#define TCS34725_ENABLE_WEN (0x08) /* Wait enable - Writing 1 activates the wait timer */
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#define TCS34725_ENABLE_AEN (0x02) /* RGBC Enable - Writing 1 actives the ADC, 0 disables it */
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#define TCS34725_ENABLE_PON (0x01) /* Power on - Writing 1 activates the internal oscillator, 0 disables it */
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#define TCS34725_ATIME (0x01) /* Integration time */
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#define TCS34725_WTIME (0x03) /* Wait time (if TCS34725_ENABLE_WEN is asserted) */
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#define TCS34725_WTIME_2_4MS (0xFF) /* WLONG0 = 2.4ms WLONG1 = 0.029s */
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#define TCS34725_WTIME_204MS (0xAB) /* WLONG0 = 204ms WLONG1 = 2.45s */
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#define TCS34725_WTIME_614MS (0x00) /* WLONG0 = 614ms WLONG1 = 7.4s */
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#define TCS34725_AILTL (0x04) /* Clear channel lower interrupt threshold */
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#define TCS34725_AILTH (0x05)
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#define TCS34725_AIHTL (0x06) /* Clear channel upper interrupt threshold */
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#define TCS34725_AIHTH (0x07)
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#define TCS34725_PERS (0x0C) /* Persistence register - basic SW filtering mechanism for interrupts */
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#define TCS34725_PERS_NONE (0b0000) /* Every RGBC cycle generates an interrupt */
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#define TCS34725_PERS_1_CYCLE (0b0001) /* 1 clean channel value outside threshold range generates an interrupt */
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#define TCS34725_PERS_2_CYCLE (0b0010) /* 2 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_3_CYCLE (0b0011) /* 3 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_5_CYCLE (0b0100) /* 5 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_10_CYCLE (0b0101) /* 10 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_15_CYCLE (0b0110) /* 15 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_20_CYCLE (0b0111) /* 20 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_25_CYCLE (0b1000) /* 25 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_30_CYCLE (0b1001) /* 30 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_35_CYCLE (0b1010) /* 35 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_40_CYCLE (0b1011) /* 40 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_45_CYCLE (0b1100) /* 45 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_50_CYCLE (0b1101) /* 50 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_55_CYCLE (0b1110) /* 55 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_PERS_60_CYCLE (0b1111) /* 60 clean channel values outside threshold range generates an interrupt */
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#define TCS34725_CONFIG (0x0D)
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#define TCS34725_CONFIG_WLONG (0x02) /* Choose between short and long (12x) wait times via TCS34725_WTIME */
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#define TCS34725_CONTROL (0x0F) /* Set the gain level for the sensor */
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#define TCS34725_ID (0x12) /* 0x44 = TCS34721/TCS34725, 0x4D = TCS34723/TCS34727 */
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#define TCS34725_STATUS (0x13)
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#define TCS34725_STATUS_AINT (0x10) /* RGBC Clean channel interrupt */
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#define TCS34725_STATUS_AVALID (0x01) /* Indicates that the RGBC channels have completed an integration cycle */
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#define TCS34725_CDATAL (0x14) /* Clear channel data */
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#define TCS34725_CDATAH (0x15)
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#define TCS34725_RDATAL (0x16) /* Red channel data */
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#define TCS34725_RDATAH (0x17)
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#define TCS34725_GDATAL (0x18) /* Green channel data */
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#define TCS34725_GDATAH (0x19)
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#define TCS34725_BDATAL (0x1A) /* Blue channel data */
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#define TCS34725_BDATAH (0x1B)
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#define TCS34725_EN_DELAY 30
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typedef enum
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{
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TCS34725_INTEGRATIONTIME_2_4MS = 0xFF, /**< 2.4ms - 1 cycle - Max Count: 1024 */
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TCS34725_INTEGRATIONTIME_24MS = 0xF6, /**< 24ms - 10 cycles - Max Count: 10240 */
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TCS34725_INTEGRATIONTIME_101MS = 0xD5, /**< 101ms - 42 cycles - Max Count: 43008 */
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TCS34725_INTEGRATIONTIME_154MS = 0xC0, /**< 154ms - 64 cycles - Max Count: 65535 */
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TCS34725_INTEGRATIONTIME_700MS = 0x00 /**< 700ms - 256 cycles - Max Count: 65535 */
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}
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tcs34725IntegrationTime_t;
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typedef enum
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{
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TCS34725_GAIN_1X = 0x00, /**< No gain */
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TCS34725_GAIN_4X = 0x01, /**< 2x gain */
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TCS34725_GAIN_16X = 0x02, /**< 16x gain */
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TCS34725_GAIN_60X = 0x03 /**< 60x gain */
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}
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tcs34725Gain_t;
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static void temp_setup_debug(int line, const char *str);
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uint8_t tcs34725Setup(lua_State* L);
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uint8_t tcs34725Enable(lua_State* L);
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uint8_t tcs34725Disable(lua_State* L);
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uint8_t tcs34725GetRawData(lua_State* L);
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uint8_t tcs34725LuaSetIntegrationTime(lua_State* L);
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uint8_t tcs34725SetIntegrationTime(tcs34725IntegrationTime_t it, lua_State* L);
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uint8_t tcs34725LuaSetGain(lua_State* L);
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uint8_t tcs34725SetGain(tcs34725Gain_t gain, lua_State* L);
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static bool _tcs34725Initialised = false;
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static int32_t _tcs34725SensorID = 0;
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static tcs34725Gain_t _tcs34725Gain = TCS34725_GAIN_1X;
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static tcs34725IntegrationTime_t _tcs34725IntegrationTime = TCS34725_INTEGRATIONTIME_2_4MS;
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os_timer_t tcs34725_timer; // timer for forced mode readout
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sint32_t cb_tcs_en;
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/**************************************************************************/
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/*!
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@brief Writes an 8 bit values over I2C
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*/
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/**************************************************************************/
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uint8_t tcs34725Write8 (uint8_t reg, uint8_t value)
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{
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platform_i2c_send_start(TCS34725_BUS_ID);
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platform_i2c_send_address(TCS34725_BUS_ID, TCS34725_ADDRESS, PLATFORM_I2C_DIRECTION_TRANSMITTER);
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platform_i2c_send_byte(TCS34725_BUS_ID, TCS34725_COMMAND_BIT | reg );
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platform_i2c_send_byte(TCS34725_BUS_ID, value);
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platform_i2c_send_stop(TCS34725_BUS_ID);
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Reads a 8 bit values over I2C
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*/
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/**************************************************************************/
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uint8_t tcs34725Read8(uint8_t reg)
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{
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uint8_t value;
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platform_i2c_send_start(TCS34725_BUS_ID);
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platform_i2c_send_address(TCS34725_BUS_ID, TCS34725_ADDRESS, PLATFORM_I2C_DIRECTION_TRANSMITTER);
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platform_i2c_send_byte(TCS34725_BUS_ID, TCS34725_COMMAND_BIT | reg);
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platform_i2c_send_stop(TCS34725_BUS_ID);
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platform_i2c_send_start(TCS34725_BUS_ID);
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platform_i2c_send_address(TCS34725_BUS_ID, TCS34725_ADDRESS, PLATFORM_I2C_DIRECTION_RECEIVER);
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value = platform_i2c_recv_byte(TCS34725_BUS_ID, 0);
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platform_i2c_send_stop(TCS34725_BUS_ID);
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return value;
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}
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/**************************************************************************/
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/*!
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@brief Reads a 16 bit values over I2C
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*/
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/**************************************************************************/
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uint16_t tcs34725Read16(uint8_t reg)
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{
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uint8_t low = tcs34725Read8(reg);
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uint8_t high = tcs34725Read8(++reg);
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return (high << 8) | low;
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}
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/**************************************************************************/
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/*!
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@brief Finishes enabling the device
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*/
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/**************************************************************************/
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uint8_t tcs34725EnableDone()
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{
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dbg_printf("Enable finished\n");
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lua_State *L = lua_getstate();
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os_timer_disarm (&tcs34725_timer);
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tcs34725Write8(TCS34725_ENABLE, TCS34725_ENABLE_PON | TCS34725_ENABLE_AEN);
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/* Ready to go ... set the initialised flag */
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_tcs34725Initialised = true;
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/* This needs to take place after the initialisation flag! */
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tcs34725SetIntegrationTime(TCS34725_INTEGRATIONTIME_2_4MS, L);
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tcs34725SetGain(TCS34725_GAIN_60X, L);
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lua_rawgeti(L, LUA_REGISTRYINDEX, cb_tcs_en); // Get the callback to call
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luaL_unref(L, LUA_REGISTRYINDEX, cb_tcs_en); // Unregister the callback to avoid leak
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cb_tcs_en = LUA_NOREF;
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lua_call(L, 0, 0);
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Enables the device
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*/
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/**************************************************************************/
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uint8_t tcs34725Enable(lua_State* L)
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{
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dbg_printf("Enable begun\n");
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if (lua_type(L, 1) == LUA_TFUNCTION || lua_type(L, 1) == LUA_TLIGHTFUNCTION) {
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if (cb_tcs_en != LUA_NOREF) {
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luaL_unref(L, LUA_REGISTRYINDEX, cb_tcs_en);
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}
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lua_pushvalue(L, 1);
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cb_tcs_en = luaL_ref(L, LUA_REGISTRYINDEX);
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} else {
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return luaL_error(L, "Enable argument must be a function.");
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}
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tcs34725Write8(TCS34725_ENABLE, TCS34725_ENABLE_PON);
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// Start a timer to wait TCS34725_EN_DELAY before calling tcs34725EnableDone
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os_timer_disarm (&tcs34725_timer);
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os_timer_setfn (&tcs34725_timer, (os_timer_func_t *)tcs34725EnableDone, NULL);
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os_timer_arm (&tcs34725_timer, TCS34725_EN_DELAY, 0); // trigger callback when readout is ready
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Disables the device (putting it in lower power sleep mode)
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*/
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/**************************************************************************/
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uint8_t tcs34725Disable(lua_State* L)
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{
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/* Turn the device off to save power */
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uint8_t reg = 0;
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reg = tcs34725Read8(TCS34725_ENABLE);
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tcs34725Write8(TCS34725_ENABLE, reg & ~(TCS34725_ENABLE_PON | TCS34725_ENABLE_AEN));
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_tcs34725Initialised = false;
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Initialises the I2C block
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*/
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/**************************************************************************/
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uint8_t tcs34725Setup(lua_State* L)
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{
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uint8_t id = 0;
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/* Make sure we have the right IC (0x44 = TCS34725 and TCS34721) */
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id = tcs34725Read8(TCS34725_ID);
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dbg_printf("id: %x\n",id);
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if (id != 0x44) {
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return luaL_error(L, "No TCS34725 found.");
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}
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lua_pushinteger(L, 1);
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return 1;
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}
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/**************************************************************************/
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/*!
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@brief Sets the integration time to the specified value
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*/
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/**************************************************************************/
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uint8_t tcs34725LuaSetIntegrationTime(lua_State* L)
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{
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tcs34725IntegrationTime_t it = luaL_checkinteger(L, 1);
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return tcs34725SetIntegrationTime(it,L);
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}
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/**************************************************************************/
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/*!
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@brief Sets the integration time to the specified value
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*/
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/**************************************************************************/
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uint8_t tcs34725SetIntegrationTime(tcs34725IntegrationTime_t it, lua_State* L)
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{
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if (!_tcs34725Initialised)
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{
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tcs34725Setup(L);
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}
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tcs34725Write8(TCS34725_ATIME, it);
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_tcs34725IntegrationTime = it;
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Sets gain to the specified value from Lua
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*/
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/**************************************************************************/
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uint8_t tcs34725LuaSetGain(lua_State* L)
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{
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tcs34725Gain_t gain = luaL_checkinteger(L, 1);
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return tcs34725SetGain(gain,L);
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}
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/**************************************************************************/
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/*!
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@brief Sets gain to the specified value
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*/
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/**************************************************************************/
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uint8_t tcs34725SetGain(tcs34725Gain_t gain, lua_State* L)
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{
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if (!_tcs34725Initialised)
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{
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return luaL_error(L, "TCS34725 not initialised.");
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}
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tcs34725Write8(TCS34725_CONTROL, gain);
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_tcs34725Gain = gain;
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return 0;
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}
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/**************************************************************************/
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/*!
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@brief Reads the raw red, green, blue and clear channel values
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*/
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/**************************************************************************/
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uint8_t tcs34725GetRawData(lua_State* L)
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{
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uint16_t r;
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uint16_t g;
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uint16_t b;
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uint16_t c;
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if (!_tcs34725Initialised)
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{
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return luaL_error(L, "TCS34725 not initialised.");
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}
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c = tcs34725Read16(TCS34725_CDATAL);
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r = tcs34725Read16(TCS34725_RDATAL);
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g = tcs34725Read16(TCS34725_GDATAL);
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b = tcs34725Read16(TCS34725_BDATAL);
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lua_pushinteger(L, c);
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lua_pushinteger(L, r);
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lua_pushinteger(L, g);
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lua_pushinteger(L, b);
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return 4;
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}
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LROT_BEGIN(tcs34725)
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LROT_FUNCENTRY( setup, tcs34725Setup )
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LROT_FUNCENTRY( enable, tcs34725Enable )
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LROT_FUNCENTRY( disable, tcs34725Disable )
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LROT_FUNCENTRY( raw, tcs34725GetRawData )
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LROT_FUNCENTRY( setGain, tcs34725LuaSetGain )
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LROT_FUNCENTRY( setIntegrationTime, tcs34725LuaSetIntegrationTime )
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LROT_END( tcs34725, NULL, 0 )
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NODEMCU_MODULE(TCS34725, "tcs34725", tcs34725, NULL);
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