Problem in twi/i2c communication receiving data

RE: Problem in twi/i2c communication receiving data

anv — Thu, 10 Aug 2017 09:52:24 GMT

I guess the reason why you can not see RXD in TWI->TWI0 is that to show it to you in debug window Keil schould really read it from the chip, but for this there is no matter who is reading it's registers, it will behave as if YOUR CODE has read the register and react correspondingly. You can still see the registers in View->Memory Window->Window# (you know the address), but don't be surprized by this "strange" behaviour.

RE: Problem in twi/i2c communication receiving data

Lalit Kumar — Thu, 22 Oct 2015 15:04:21 GMT

Got the code working, what a silly mistake i was doing, Thanks :). For the RXD register, I tried changing optimization to all the options and recompiled the project, but RXD is still not showing in the debug window. Also can you tell me about the process to view err_code, it says "out of scope" in debug window?

RE: Problem in twi/i2c communication receiving data

Ole Bauck — Thu, 22 Oct 2015 14:52:22 GMT

The array is not allocated, change to

uint8_t rx_data[1];

err_code = nrf_drv_twi_rx(&p_twi, 0x08, rx_data, sizeof(rx_data), false);

To get all bytes you should make the array of size 4.

Usually you can see all registers in View->System viewer->TWI->TWI0, but I see that the RXD register is not there. I do not know quite why. To see the variables, try to turn down the optimization in project->options for target->c/c++ tab.