UART issuses on nRF Connect SDK 1.5.1

Question

Hello Nordic Team, 
 
 I am having issues with the peripheral_uart firmware for the nRF52833. 
 1.I can use UART_init() or nrf_drv_uart_uninit() in nRF52-SDK to enable or disable UART. How can I do that in NCS? 
 2.I changed the baud rate to 921600bps. An error occurred that caused the system to reset. I found that it is caused by k_free (buf) in ble_write_thread (). How can I solve it? 
 
 3.Can I use firmware to configure an external or internal 32.768k crystal oscillator? 
 
 Thanks, 
 Stanley

Stanley · Accepted Answer

Hi,

I found that the GPIO level of my demo board is not 3.3V. It was correct after I changed it to 3.3V.

I forgot that I was using nRF52833, I am very sorry.

static void gpio_output_voltage_setup(uint32_t UICR_REGOUT0_VOUT)
{
if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) !=
(UICR_REGOUT0_VOUT << UICR_REGOUT0_VOUT_Pos))
{
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
(UICR_REGOUT0_VOUT << UICR_REGOUT0_VOUT_Pos);

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

NVIC_SystemReset();
}

In addition, I found that the settings of the external or internal 32.768k crystal oscillator can be modified in mpsl_lib_init().
All problems have been resolved.

Thanks,

Stanley

UART issuses on nRF Connect SDK 1.5.1

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