NHS3152 I2C connection problem

[damian_potoczny]

Hello,

I'm trying to connect a peripheral IC to NHS3152 demo board. I'm using the I2CIO library part and informations provided in release_mra2_11_2_nhs3152 SDK. I'm facing the following issue:
I am not able to select the device via I2C - the address 0xEA should be sent, but on the bus i am observing a different output:

The data is recognized as '212' but it should be '234'
The system runs at 4 MHz, and the I2C is set to 100kHz.

Thanks in advance for any help provided.
Damian

[Kan_Li]

Hello,

Is it possible to have your application code for a review?

Have a great day,
Kan

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[damian_potoczny · Accepted solution]

Hello,

Thank you for the reply.Kan‌

Just the other day i/ve found the anserw myself by reading through the I2C driver library.

It turns out that the lib shifts the inputed address bits by one to the left to make room for the R/W bit.

int handleMasterXferState(NSS_I2C_T *pI2C, I2C_XFER_T *xfer) {

uint32_t cclr = I2C_CON_FLAGS;

switch (getCurState(pI2C)) {

case 0x08: /* Start condition on bus */

case 0x10: /* Repeated start condition */

pI2C->DAT = (uint32_t)((xfer->slaveAddr << 1) | (xfer->txSz == 0));

break;

I've been addressing the device with 8 bits ( R/W bit included).

I've corrected that and now it works like a charm.

Damian

[Kan_Li]

Hi Damian,

Thanks for the update!

Best Regards,

Kan