Reading TMP102 sensor data over i2c.

RE: Reading TMP102 sensor data over i2c.

Kevin — Tue, 14 Apr 2015 16:28:44 GMT

Could you please share your solution in project form?

RE: Reading TMP102 sensor data over i2c.

HenriL — Wed, 27 Aug 2014 08:13:29 GMT

Thank you for these posts, it works for me with TMP102_ADRESS (0x48<<1) And calling in the main :

twi_master_init() //dunno if necessary and then

uint8_t TempI2Cdata[2]; //Get 2 bytes (float and integer part) of TMP102

TMP_getdata(TempI2Cdata);

RE: Reading TMP102 sensor data over i2c.

Takatoshi Nao — Wed, 27 Aug 2014 01:25:50 GMT

Hi Janek. It worked.　Thank you very much.

RE: Reading TMP102 sensor data over i2c.

Janek Mann — Tue, 26 Aug 2014 11:06:57 GMT

Hi Takoshi,

#define TMP102_ADDRESS (0x90 << 1)

is wrong (0x90 is already the 8-bit representation of the I2C address, 0x48 would be the equivalent 7-bit representation, shifting 0x90 left by one exceeds 8 bits).

Try it with

#define TMP102_ADDRESS 0x90

RE: Reading TMP102 sensor data over i2c.

Takatoshi Nao — Tue, 26 Aug 2014 06:10:45 GMT

When I debugged, TWI_SDA_READ() reads NACK in twi_master_clock_byte(address). What's the problem?

RE: Reading TMP102 sensor data over i2c.

Takatoshi Nao — Tue, 26 Aug 2014 01:49:27 GMT

Thank you for responding. but not worked. My Question is edited with my code.

RE: Reading TMP102 sensor data over i2c.

Janek Mann — Mon, 25 Aug 2014 15:49:29 GMT

You can use the twi_master library provided in the NRF51 SDK:

#define TMP_ADDRESS (0x49 << 1)

void TMP_getdata(uint8_t* data) {
		twi_master_transfer(TMP_ADDRESS | TWI_READ_BIT, data, 2, TWI_ISSUE_STOP);
}

You need to create a file twi_master_config.h with your pin configuration, and add the twi_sw_master.c file to your project, and call twi_master_setup before calling the other twi functions.