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/*
TSL2591 for ChibiOS/RT - Copyright (C) 2016 Stephane D'Alu
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
*
* DOC: http://ams.com/eng/content/download/389383/1251117/221235
*/
#define I2C_HELPERS_AUTOMATIC_DRV TRUE
#include "hal.h"
#include "i2c_helpers.h"
#include "tsl2591.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define TSL2591_LUX_DF (408.0F)
#define TSL2591_LUX_COEFB (1.64F) // CH0 coefficient
#define TSL2591_LUX_COEFC (0.59F) // CH1 coefficient A
#define TSL2591_LUX_COEFD (0.86F) // CH2 coefficient B
/* I2C registers */
#define TSL2591_REG_ENABLE 0x00
#define TSL2591_REG_CONFIG 0x01 /**< @brief gain and integration */
#define TSL2591_REG_AILTL 0x04
#define TSL2591_REG_AILTH 0x05
#define TSL2591_REG_AIHTL 0x06
#define TSL2591_REG_AIHTH 0x07
#define TSL2591_REG_NPAILTL 0x08
#define TSL2591_REG_NPAILTH 0x09
#define TSL2591_REG_NPAIHTL 0x0A
#define TSL2591_REG_NPAIHTH 0x0B
#define TSL2591_REG_PERSIST 0x0C
#define TSL2591_REG_PID 0x11 /**< @brief Package ID */
#define TSL2591_REG_ID 0x12 /**< @brief Device ID */
#define TSL2591_REG_STATUS 0x13 /**< @brief Device status */
#define TSL2591_REG_C0DATAL 0x14 /**< @brief CH0 ADC low data byte */
#define TSL2591_REG_C0DATAH 0x15 /**< @brief CH0 ADC high data byte */
#define TSL2591_REG_C1DATAL 0x16 /**< @brief CH1 ADC low data byte */
#define TSL2591_REG_C1DATAH 0x17 /**< @brief CH1 ADC high data byte */
#define TSL2591_REG_COMMAND 0x80 /**< @brief Select command register */
#define TSL2591_REG_NORMAL 0x20 /**< @brief Normal opearation */
#define TSL2591_REG_SPECIAL 0x60 /**< @brief Special function */
#define TSL2591_ID_TSL2591 0x50
#define TSL2591_VISIBLE (2) // channel 0 - channel 1
#define TSL2591_INFRARED (1) // channel 1
#define TSL2591_FULLSPECTRUM (0) // channel 0
#define TSL2591_ENABLE_POWERON (0x01)
#define TSL2591_ENABLE_POWEROFF (0x00)
#define TSL2591_ENABLE_AEN (0x02)
#define TSL2591_ENABLE_AIEN (0x10)
#define TSL2591_CONTROL_RESET (0x80)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static inline uint32_t
calculateIlluminance(TSL2591_integration_time_t integration_time,
TSL2591_gain_t gain,
uint16_t broadband, uint16_t ir) {
uint16_t atime, again;
/* Check for overflow conditions first */
if ((broadband == 0xFFFF) | (ir == 0xFFFF)) {
return 0xFFFFFFFF; /* Signal overflow */
}
switch (integration_time) {
case TSL2591_INTEGRATIONTIME_100MS : atime = 100; break;
case TSL2591_INTEGRATIONTIME_200MS : atime = 200; break;
case TSL2591_INTEGRATIONTIME_300MS : atime = 300; break;
case TSL2591_INTEGRATIONTIME_400MS : atime = 400; break;
case TSL2591_INTEGRATIONTIME_500MS : atime = 500; break;
case TSL2591_INTEGRATIONTIME_600MS : atime = 600; break;
}
switch (gain) {
case TSL2591_GAIN_1X : again = 1; break;
case TSL2591_GAIN_25X : again = 25; break;
case TSL2591_GAIN_415X : again = 415; break;
case TSL2591_GAIN_10000X : again = 10000; break;
}
// cpl = (ATIME * AGAIN) / DF
float cpl = ((float)(atime * again)) / ((float)TSL2591_LUX_DF);
float lux1 = ( ((float)broadband) - (TSL2591_LUX_COEFB * (float)ir) ) / cpl;
float lux2 = ( (TSL2591_LUX_COEFC * (float)broadband) -
(TSL2591_LUX_COEFD * (float)ir ) ) / cpl;
return (uint32_t) (lux1 > lux2 ? lux1 : lux2);
}
static inline msg_t
_readChannel(TSL2591_drv *drv, uint16_t *broadband, uint16_t *ir) {
msg_t msg;
if (((msg = i2c_reg_recv16_le(
TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_C0DATAL,
broadband)) < MSG_OK) ||
((msg = i2c_reg_recv16_le(
TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_C1DATAL,
ir )) < MSG_OK))
return msg;
return MSG_OK;
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
void
TSL2591_init(TSL2591_drv *drv, TSL2591_config *config) {
drv->config = config;
drv->gain = TSL2591_GAIN_1X;
drv->integration_time = TSL2591_INTEGRATIONTIME_100MS;
drv->state = SENSOR_INIT;
}
msg_t
TSL2591_check(TSL2591_drv *drv) {
uint8_t id;
msg_t msg;
if ((msg = i2c_reg_recv8(TSL2591_REG_COMMAND | TSL2591_REG_NORMAL |
TSL2591_REG_ID, &id)) < MSG_OK)
return msg;
if (id != TSL2591_ID_TSL2591)
return SENSOR_NOTFOUND;
return MSG_OK;
}
msg_t
TSL2591_start(TSL2591_drv *drv) {
struct __attribute__((packed)) {
uint8_t reg;
uint8_t conf;
} tx_config = {
TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_CONFIG,
(uint8_t)(drv->integration_time | drv->gain) };
struct __attribute__((packed)) {
uint8_t reg;
uint8_t conf;
} tx_start = {
TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_ENABLE,
TSL2591_ENABLE_POWERON };
msg_t msg;
if (((msg = i2c_send((uint8_t*)&tx_config, sizeof(tx_config))) < MSG_OK) ||
((msg = i2c_send((uint8_t*)&tx_start, sizeof(tx_start ))) < MSG_OK)) {
drv->state = SENSOR_ERROR;
return msg;
}
drv->state = SENSOR_STARTED;
return MSG_OK;
}
msg_t
TSL2591_stop(TSL2591_drv *drv) {
struct __attribute__((packed)) {
uint8_t reg;
uint8_t conf;
} tx_stop = {
TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_ENABLE,
TSL2591_ENABLE_POWEROFF };
return i2c_send((uint8_t*)&tx_stop, sizeof(tx_stop));
}
msg_t
TSL2591_setIntegrationTime(TSL2591_drv *drv,
TSL2591_integration_time_t time) {
struct __attribute__((packed)) {
uint8_t reg;
uint8_t conf;
} tx = { TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_CONFIG,
(uint8_t)(time | drv->gain) };
msg_t msg;
if ((msg = i2c_send((uint8_t*)&tx, sizeof(tx))) < MSG_OK)
return msg;
drv->integration_time = time;
return MSG_OK;
}
msg_t
TSL2591_setGain(TSL2591_drv *drv,
TSL2591_gain_t gain) {
struct __attribute__((packed)) {
uint8_t reg;
uint8_t conf;
} tx = { TSL2591_REG_COMMAND | TSL2591_REG_NORMAL | TSL2591_REG_CONFIG,
(uint8_t)(drv->integration_time | gain) };
msg_t msg;
if ((msg = i2c_send((uint8_t*)&tx, sizeof(tx))) < MSG_OK)
return msg;
drv->gain = gain;
return MSG_OK;
}
unsigned int
TSL2591_getAcquisitionTime(TSL2591_drv *drv) {
switch (drv->integration_time) {
case TSL2591_INTEGRATIONTIME_100MS : return 100;
case TSL2591_INTEGRATIONTIME_200MS : return 200;
case TSL2591_INTEGRATIONTIME_300MS : return 300;
case TSL2591_INTEGRATIONTIME_400MS : return 400;
case TSL2591_INTEGRATIONTIME_500MS : return 500;
case TSL2591_INTEGRATIONTIME_600MS : return 600;
}
return -1;
}
msg_t
TSL2591_readIlluminance(TSL2591_drv *drv,
unsigned int *illuminance) {
uint16_t broadband;
uint16_t ir;
/* Read channels */
msg_t msg;
if ((msg = _readChannel(drv, &broadband, &ir)) < MSG_OK)
return msg;
/* Calculate illuminance */
*illuminance =
calculateIlluminance(drv->integration_time, drv->gain,
broadband, ir);
/* Ok */
return SENSOR_OK;
}
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