examples\peripheral\uart - printf is not working

RE: examples\peripheral\uart - printf is not working

Hung Bui — Fri, 07 Dec 2018 09:19:49 GMT

Hi Eran,

If you have a nRF51 DK please try to test the uart example without any modification. A logic analyzer would be useful to check if there is any output on the TX pin.

Both the NRF_LOG module and APP_UART uses nrf_drv_uart to output data to uart. I would suggest to try using the nrf_drv_uart to output some data.

Usually the uart example works out of the box with the nRF51 DK. You can try to test with a fresh copy of the SDK, just to be sure.

RE: examples\peripheral\uart - printf is not working

Ron — Thu, 06 Dec 2018 18:33:06 GMT

Hi Hung

the problem is that there is not output on the uart_tx

I have used the uart example as is

thanks

Eran

RE: examples\peripheral\uart - printf is not working

Hung Bui — Wed, 05 Dec 2018 17:37:03 GMT

Hi Eran,

Could you explain which exactly the problem you have now ? It's not very clear from your description.

When you run the uart example in the SDK (which in the image you provided ? ) do you have any problem ?

If you are integrating APP_UART_FIFO into your project, please make sure you include app_uart_fifo.c and app_fifo.c in your project.

Basically printf function will use fputc to print out each characters and fputc is redefined in retarget.c to use app_uart_put () to send the character out to UART port.