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_init(tcs37727_t *dev, const tcs37727_params_t *params)
{
uint8_t tmp;
/* check parameters */
assert(dev && params);
/* initialize the device descriptor */
memcpy(&dev->p, params, sizeof(tcs37727_params_t));
/* setup the I2C bus */
i2c_acquire(BUS);
if (i2c_init_master(BUS, I2C_SPEED) < 0) {
i2c_release(BUS);
LOG_ERROR("[tcs37727] init: error initializing I2C bus\n");
return TCS37727_NOBUS;
}
/* check if we can communicate with the device */
i2c_read_reg(BUS, ADR, TCS37727_ID, &tmp);
if (tmp != TCS37727_ID_VALUE) {
i2c_release(BUS);
LOG_ERROR("[tcs37727] init: error while reading ID register\n");
return TCS37727_NODEV;
}
/* configure gain and conversion time */
i2c_write_reg(BUS, ADR, TCS37727_ATIME, TCS37727_ATIME_TO_REG(dev->p.atime));
i2c_write_reg(BUS, ADR, TCS37727_CONTROL, TCS37727_CONTROL_AGAIN_4);
dev->again = 4;
/* enable the device */
tmp = (TCS37727_ENABLE_AEN | TCS37727_ENABLE_PON);
i2c_write_reg(BUS, ADR, TCS37727_ENABLE, tmp);
i2c_release(BUS);
return TCS37727_OK;
}
