nRF51822 UART not work

[yillkid]

Hi all My hardware is nRF51822 PCA0000 and PCA0001, I just want to compile/load any UART example to test my UART workable or not. So I have tried example project button_radio_example、led_radio_example and uart_example, I got no signal on hypetrm with any example project. I set break point on Keil with any example project and got the same result, the processing hang on :

PCA0000 :

void simple_uart_put(uint8_t cr)
{
  NRF_UART0->TXD = (uint8_t)cr;

  while (NRF_UART0->EVENTS_TXDRDY!=1)   // HANG ON THIS LINE !!!!!!
  {
    // Wait for TXD data to be sent
  }

  NRF_UART0->EVENTS_TXDRDY=0;
}

PCA0001 :

uint8_t simple_uart_get(void)
{
  while (NRF_UART0->EVENTS_RXDRDY != 1)   // HANG ON THIS LINE !!!!!!
  {
    // Wait for RXD data to be received
  }
  
  NRF_UART0->EVENTS_RXDRDY = 0;
  return (uint8_t)NRF_UART0->RXD;
}

any idea ?

[Ole Morten]

I've attached a hex file that I just tested on my PCA10001 version 2.0 board. Can you please check whether it works correctly? You should also check that you haven't broken the solder bridges SB9-SB12, and that you have hardware flow control enabled in your terminal program.

[yillkid]

I update my issue. Now I can run the UART example project on PCA0001 hypertrm. So when I load "uart_example" example project, I can see "Start:" message in hypertrm.

But I can not run any UART example on PCA0000 hypertrm. For example, when I complie/load the example project: "button_radio_example" and "led_radio_example", I can not see any message on PCA0000 hypertrm, even if I press BUTTON0/1 with PAC0001 board on "button_radio_example", or press 0/1 button with keyboard on "led_radio_example",

any idea?

[Bastiaan]

I'd recommend you to verify again that the pin-out is correct. Depending on the hardware revision on your dongle, you may have to change the defines for the UART pins. The pinout is described in section 5.2.5 of the Development Kit user guide.

I'd recommend to keep working on the uart_example until you are sure that you can both receive and send UART bytes to it. If you can receive text, but not write text, you should make sure that you have flow control enabled in your terminal software.

[Guest]

I'd recommend you to verify again that the pin-out is correct. Depending on the hardware revision on your dongle, you may have to change the defines for the UART pins. The pinout is described in section 5.2.5 of the Development Kit user guide.

I'd recommend to keep working on the uart_example until you are sure that you can both receive and send UART bytes to it. If you can receive text, but not write text, you should make sure that you have flow control enabled in your terminal software.