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/*
* Copyright (C) 2015 PHYTEC Messtechnik GmbH
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*
*/
/**
* @ingroup drivers_tcs37727
* @{
*
* @file
* @brief Driver for the AMS TCS37727 Color Light-To-Digital Converter
*
* @author Felix Siebel <f.siebel@phytec.de>
* @author Johann Fischer <j.fischer@phytec.de>
*
* @}
*/
#include <stdint.h>
#include <stdbool.h>
#include "periph/i2c.h"
#include "tcs37727.h"
#include "tcs37727-internal.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define I2C_SPEED I2C_SPEED_FAST
static int tcs37727_test(tcs37727_t *dev)
{
uint8_t id;
i2c_acquire(dev->i2c);
if (i2c_read_reg(dev->i2c, dev->addr, TCS37727_ID, &id) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
if (id != TCS37727_ID_VALUE) {
return -1;
}
return 0;
}
int tcs37727_init(tcs37727_t *dev, i2c_t i2c, uint8_t address, int atime_us)
{
/* write device descriptor */
dev->i2c = i2c;
dev->addr = address;
dev->initialized = false;
i2c_acquire(dev->i2c);
/* initialize the I2C bus */
if (i2c_init_master(i2c, I2C_SPEED) < 0) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
if (tcs37727_test(dev)) {
return -2;
}
i2c_acquire(dev->i2c);
if (i2c_write_reg(dev->i2c, dev->addr, TCS37727_CONTROL,
TCS37727_CONTROL_AGAIN_4) != 1) {
i2c_release(dev->i2c);
return -3;
}
dev->again = 4;
if (i2c_write_reg(dev->i2c, dev->addr, TCS37727_ATIME,
TCS37727_ATIME_TO_REG(atime_us)) != 1) {
i2c_release(dev->i2c);
return -3;
}
dev->atime_us = atime_us;
dev->initialized = true;
i2c_release(dev->i2c);
return 0;
}
int tcs37727_set_rgbc_active(tcs37727_t *dev)
{
uint8_t reg;
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, TCS37727_ENABLE, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
reg |= (TCS37727_ENABLE_AEN | TCS37727_ENABLE_PON);
if (i2c_write_reg(dev->i2c, dev->addr, TCS37727_ENABLE, reg) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
int tcs37727_set_rgbc_standby(tcs37727_t *dev)
{
uint8_t reg;
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr, TCS37727_ENABLE, ®, 1) != 1) {
i2c_release(dev->i2c);
return -1;
}
reg &= ~TCS37727_ENABLE_AEN;
if (!(reg & TCS37727_ENABLE_PEN)) {
reg &= ~TCS37727_ENABLE_PON;
}
if (i2c_write_reg(dev->i2c, dev->addr, TCS37727_ENABLE, reg) != 1) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
return 0;
}
static uint8_t tcs37727_trim_gain(tcs37727_t *dev, int rawc)
{
uint8_t reg_again = 0;
int val_again = dev->again;
if (dev->initialized == false) {
return -1;
}
if (rawc < TCS37727_AG_THRESHOLD_LOW) {
switch (val_again) {
case 1:
reg_again = TCS37727_CONTROL_AGAIN_4;
val_again = 4;
break;
case 4:
reg_again = TCS37727_CONTROL_AGAIN_16;
val_again = 16;
break;
case 16:
reg_again = TCS37727_CONTROL_AGAIN_60;
val_again = 60;
break;
case 60:
default:
return -1;
}
}
else if (rawc > TCS37727_AG_THRESHOLD_HIGH) {
switch (val_again) {
case 60:
reg_again = TCS37727_CONTROL_AGAIN_16;
val_again = 16;
break;
case 16:
reg_again = TCS37727_CONTROL_AGAIN_4;
val_again = 4;
break;
case 4:
reg_again = TCS37727_CONTROL_AGAIN_1;
val_again = 1;
break;
case 1:
default:
return -1;
}
}
else {
return 0;
}
i2c_acquire(dev->i2c);
uint8_t reg = 0;
if (i2c_read_reg(dev->i2c, dev->addr, TCS37727_CONTROL, ®) != 1) {
i2c_release(dev->i2c);
return -2;
}
reg &= ~TCS37727_CONTROL_AGAIN_MASK;
reg |= reg_again;
if (i2c_write_reg(dev->i2c, dev->addr, TCS37727_CONTROL, reg) != 1) {
i2c_release(dev->i2c);
return -2;
}
i2c_release(dev->i2c);
dev->again = val_again;
return 0;
}
int tcs37727_read(tcs37727_t *dev, tcs37727_data_t *data)
{
uint8_t buf[8];
if (dev->initialized == false) {
return -1;
}
i2c_acquire(dev->i2c);
if (i2c_read_regs(dev->i2c, dev->addr,
(TCS37727_INC_TRANS | TCS37727_CDATA), buf, 8) != 8) {
i2c_release(dev->i2c);
return -1;
}
i2c_release(dev->i2c);
int32_t tmpc = ((uint16_t)buf[1] << 8) | buf[0];
int32_t tmpr = ((uint16_t)buf[3] << 8) | buf[2];
int32_t tmpg = ((uint16_t)buf[5] << 8) | buf[4];
int32_t tmpb = ((uint16_t)buf[7] << 8) | buf[6];
DEBUG("rawr: %"PRIi32" rawg %"PRIi32" rawb %"PRIi32" rawc %"PRIi32"\n",
tmpr, tmpg, tmpb, tmpc);
/* Remove IR component as described in the DN40. */
int32_t ir = (tmpr + tmpg + tmpb - tmpc) >> 1;
tmpr -= ir;
tmpg -= ir;
tmpb -= ir;
/* Color temperature calculation as described in the DN40. */
int32_t ct = (CT_COEF_IF * tmpb) / tmpr + CT_OFFSET_IF;
/* Lux calculation as described in the DN40. */
int32_t gi = R_COEF_IF * tmpr + G_COEF_IF * tmpg + B_COEF_IF * tmpb;
/* TODO: add Glass Attenuation Factor GA compensation */
int32_t cpl = (dev->atime_us * dev->again) / DGF_IF;
int32_t lux = gi / cpl;
/* Autogain */
tcs37727_trim_gain(dev, tmpc);
data->red = (tmpr < 0) ? 0 : (tmpr * 1000) / cpl;
data->green = (tmpg < 0) ? 0 : (tmpg * 1000) / cpl;
data->blue = (tmpb < 0) ? 0 : (tmpb * 1000) / cpl;
data->clear = (tmpb < 0) ? 0 : (tmpc * 1000) / cpl;
data->lux = (lux < 0) ? 0 : lux;
data->ct = (ct < 0) ? 0 : ct;
return 0;
}
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