uint8_t
mti_tcn75a_get_temperature(int32_t *result)
{
uint16_t tmp;
uint8_t rc;
uint8_t tmp_lsb = 4;
uint8_t tmp_msb = 2;
/* start */
StartI2C1();
/* send slave address (write) */
rc = WriteI2C1(0b10010000);
if (rc != 0x00) {
rc = CH_ERROR_I2C_SLAVE_ADDRESS;
goto out;
}
/* set ambient temperature pointer */
rc = WriteI2C1(0b00000000);
/* reset the bus */
RestartI2C1();
/* send slave address (read) */
WriteI2C1(0b10010001);
/* read the temperature */
tmp_msb = ReadI2C1();
AckI2C1();
tmp_lsb = ReadI2C1();
NotAckI2C1();
/* stop */
StopI2C1();
/* format result */
*result = (((int32_t) tmp_msb) << 16) + (((int32_t) tmp_lsb) << 8);
out:
return rc;
}
unsigned char I2CReadByte(unsigned char add,unsigned char subadd)
{
unsigned char _temp=0;
StartI2C1();
while(WriteI2C1(add<<1)!=0);
while(WriteI2C1(subadd)!=0);
RestartI2C1();
while(WriteI2C1(1+(add<<1))!=0);
_temp=ReadI2C1();
NotAckI2C1();
StopI2C1();
return _temp;
}
int8_t I2C1dev_readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data) {
count_accel = 0;
// S
IdleI2C1();
StartI2C1();
// Device write address
IdleI2C1();
WriteI2C1(devAddr << 1 | 0x00);
// Register address
IdleI2C1();
WriteI2C1(regAddr);
// R
IdleI2C1();
RestartI2C1();
// Device read address
IdleI2C1();
WriteI2C1(devAddr << 1 | 0x01);
for (count_accel = 0; count_accel < length; count_accel++) {
// Data byte
IdleI2C1();
data[count_accel] = ReadI2C1();
if (count_accel == length - 1) {
// NACK
IdleI2C1();
NotAckI2C1();
} else {
// ACK
IdleI2C1();
AckI2C1();
}
}
// P
IdleI2C1();
StopI2C1();
return count_accel;
}
bool HTS221init(void)
{
// Check WHO_AM_I register of HTS221
ReadI2C1(HTS221_WHO_AM_I);
if (I2C1_val1 == 0xBC)
{
writeI2C1reg(HTS221_AV_CONF, avgT << 3 | avgH); // set temperature and humidity averaging
// power on HTS221 (bit 7) and enable block data update (bit 2)
writeI2C1reg(HTS221_CTRL_REG1, 0x80 | 0x04 | HTODR); // set temperature and humidity sample ODR
// Read calibrations data
H0_rH_x2 = ReadI2C0(HTS221_CALIB_0);
H1_rH_x2 = ReadI2C0(HTS221_CALIB_1);
T0_degC_x8 = ReadI2C0(HTS221_CALIB_2);
T1_degC_x8 = ReadI2C0(HTS221_CALIB_3);
T0_msb = ReadI2C0(HTS221_CALIB_5) & 0x03;
T1_msb = (ReadI2C0(HTS221_CALIB_5) & 0x0C) >> 2;
H0_T0_OUT = (int16_t) ((int16_t) ReadI2C0(HTS221_CALIB_7) << 8 | ReadI2C0(HTS221_CALIB_6));
H1_T0_OUT = (int16_t) ((int16_t) ReadI2C0(HTS221_CALIB_B) << 8 | ReadI2C0(HTS221_CALIB_A));
T0_OUT = (int16_t) ((int16_t) ReadI2C0(HTS221_CALIB_D) << 8 | ReadI2C0(HTS221_CALIB_C));
T1_OUT = (int16_t) ((int16_t) ReadI2C0(HTS221_CALIB_F) << 8 | ReadI2C0(HTS221_CALIB_E));
return true;
}