TWI communication doesn't work

RE: TWI communication doesn't work

Øyvind Karlsen — Fri, 07 Aug 2015 06:20:48 GMT

Yes, you set the RX and TX pin for UART as a part of the initialization call, see this infocenter page.

RE: TWI communication doesn't work

Alex — Thu, 06 Aug 2015 15:18:19 GMT

Yes, change for any unused. If you are using nRF51 DK development board you can use RTT for console debugging.

RE: TWI communication doesn't work

ppatierno — Thu, 06 Aug 2015 15:15:56 GMT

I just discovered that I setup UART an the RX_PIN_NUMBER is 11 ... like the SCL !! I started from the ANCS example so never modified it. Is it possibile to change the RX_PIN_NUMBER with any other pins for using UART ? (I need it for console debugging)

RE: TWI communication doesn't work

Alex — Thu, 06 Aug 2015 15:04:01 GMT

Is there anything else connected to SCL line on your PCB?

RE: TWI communication doesn't work

ppatierno — Thu, 06 Aug 2015 14:50:58 GMT

Yes I'm sure. Using oscilloscope I see two strange things : I execute my code only one time but the signals changes continuously (the trigger on the oscilloscope is always active) and the SCL clock isn't a period signal and it's not about 400 KHz as frequency it seems to be as Mhz signal

RE: TWI communication doesn't work

Alex — Thu, 06 Aug 2015 14:23:48 GMT

Have you used correct IO pins for TWI according to your hardware?

RE: TWI communication doesn't work

ppatierno — Thu, 06 Aug 2015 13:01:11 GMT

I just realized that the nrf_drv_twi_tx function return 3 as error code so NRF_ERROR_INTERNAL. How can I check what's the internal error ? (I'm working in blocking mode).