I need help to setup TMP102 alarm function. My board is NUCLEO-F439ZI
Reading the temperature is working fine.
uint8_t TMP102_ADDR = 0x48 << 1;
uint8_t REG_TEMP = 0x00;
uint8_t buf[12];
buf[0] = REG_TEMP;
ret = HAL_I2C_Master_Transmit(&hi2c2, 0x90, buf, 1, 10); // OK
ret = HAL_I2C_Master_Transmit(&hi2c2, 0x90, 0x00, 1, 10); //OK
ret = HAL_I2C_Master_Receive(&hi2c2, 0x90, buf, 2 , 10); //OK
reads the temperature correctly. Buf[0] and buf[1]has correct temperature data.
I am trying to setup the alarm function. Reading/writing the Limit registers are failing.
Datasheet states that Thigh=80C, and Tlow=70C. After Reset.
I am reading the Thigh registers, with the following code:
uint8_t reghi = 0x03;
ret = HAL_I2C_Master_Transmit(&hi2c2, TMP102_ADDR, reghi, 1, 10); // fail
is sending 0x00 on reghi. I verified by scope.
ret = HAL_I2C_Master_Transmit(&hi2c2, TMP102_ADDR, 0x03, 1, 10); //fail
it is sending 0x00 to configuration register.
The only way to send the right value accomplished by:
Unit8_t reghi = 0x03;
buf[0] = reghigh;
ret = HAL_I2C_Master_Transmit(&hi2c2, TMP102_ADDR, buf, 1, 10); OK.
Sending 0x03 to select the Thigh register. Verified by scope.
Now I want to read the value of Thigh.
ret = HAL_I2C_Master_Receive(&hi2c2, TMP102_ADDR, buf, 2 , 100);
The value in buf[0] = 0x00;
The value in buf{1] = 0x00;
I verified it in Debug mode.
The same problem when I write two bytes to Thigh and read it back
It gives 0x00 for both bytes.
If anybody tried to set the alarm successfully in TMp102, please help.
Thanks,
Rasem
