Adding printf() in UART caused stalling

[Christopher Bilal]

I tried to use printf() to get the data from SPI buffers. It runs OK in the peripheral/spi  example. But when I moved it to the ble_app_uart, the program stalled at printf.

Here is the code that stalled the debugging:

printf("TX: %x %x %x %x, RX :%x %x %x %x", spi_tx_buf[0], spi_tx_buf[1], spi_tx_buf[2], spi_tx_buf[3], spi_rx_buf[0], spi_rx_buf[1], spi_rx_buf[2], spi_rx_buf[3]);

Here is the place that my program paused at: It is in nrfx_uart.c

Can someone help me with this issue?

Thanks,

Chris

[JONATHAN LL]

Hi Chris,


What nRF5SDK are you using?

printf("TX: %x %x %x %x, RX :%x %x %x %x", spi_tx_buf[0], spi_tx_buf[1], spi_tx_buf[2], spi_tx_buf[3], spi_rx_buf[0], spi_rx_buf[1], spi_rx_buf[2], spi_rx_buf[3]);

Have you tried to only print parts of this to se if it works?

Regards,
Jonathan

[Christopher Bilal]

Hi,

Thanks for your help!

I am using nRF52832.

I tried to only print one buffer, but it still stalled the program.

[JONATHAN LL]

Christopher Bilal said:

I am using nRF52832

Nice to know the HW but I was thinking about soft ware, What version of the nRF5 SDK are you using?


Did you use an example project to start working? If so what example, or could you share the project maybe?


Regards,
Jonathan

[Christopher Bilal]

I am using SDK 17.0.

I started with nrf_ble_uart and spi examples. I also added GPIOTE to trigger SPI. The program worked fine in spi but when I added the code to uart it can not work.

[JONATHAN LL]

Hi,

Have a look at  NRF_LOG_BACKEND_RTT_ENABLED and NRF_LOG_BACKEND_UART_ENABLED. What is it in the sdk_config.h

And could it be that you have a memory map issue, where you have used SPI and TWI from the same address?
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/memory.html?cp=4_2_0_7_2#memorymap 

Regards,
Jonathan

[Christopher Bilal]

Hi,

The RTT is enabled but  NRF_LOG_BACKEND_UART_ENABLED is not there. 

How should I add it? 

For the SPI and TWI part, how can I know if I have the memory map issue?

Thanks,

[JONATHAN LL]

Christopher Bilal said:

For the SPI and TWI part, how can I know if I have the memory map issue?

In the section of the documentation it shows what address the different peripherals has, some peripherals has the same address, so they can not be used at the same time.  
Example, SPI0 and TWI0 share the same base address.



Where in the in code is the printf() called?


Can you share you project?

Regards,
Jonathan