if initial uart_config() before ble_stack_init(), softdevice_handler_init will be failed!

[hawk]

if initial uart_config() before ble_stack_init(), softdevice_handler_init will be failed! with SDK 6.0

softdevice_handler_init() will returns 0x00001001 ("NRF_ERROR_SDM_INCORRECT_INTERRUPT_CONFIGURATION).

it is nothing to do with "NRF_CLOCK_LFCLKSRC_XTAL_20_PPM". .so i initial uart_config() after ble_stack_init(), then it is ok..

what's the problem?

[Håkon Alseth]

Hi,

What interrupt priority are you setting in your uart_init() function? To work with the softdevice this shall be either '1' or '3' (APP_IRQ_PRIORITY_LOW or APP_IRQ_PRIORITY_HIGH)

Cheers, Håkon

[hawk]

void uart_config(uint8_t txd_pin_number, uint8_t rxd_pin_number) { rxwp = 0; rxrp = 0; nrx = 0;

nrf_gpio_cfg_output(txd_pin_number);
nrf_gpio_cfg_input(rxd_pin_number, NRF_GPIO_PIN_NOPULL);  

NRF_UART0->PSELTXD          = txd_pin_number;
NRF_UART0->PSELRXD          = rxd_pin_number;

NRF_UART0->BAUDRATE         = (UART_BAUDRATE_BAUDRATE_Baud38400 << UART_BAUDRATE_BAUDRATE_Pos);
NRF_UART0->ENABLE           = (UART_ENABLE_ENABLE_Enabled << UART_ENABLE_ENABLE_Pos);
NRF_UART0->TASKS_STARTTX    = 1;
NRF_UART0->TASKS_STARTRX    = 1;
NRF_UART0->EVENTS_RXDRDY    = 0;     
NRF_UART0->INTENSET        |= (UART_INTENSET_RXDRDY_Enabled << UART_INTENSET_RXDRDY_Pos );

NVIC_EnableIRQ(UART0_IRQn);

}

[Håkon Alseth]

Could you set "NVIC_SetPriority(UART0_IRQn, 3);"? The reset value of the interrupt priority register is 0, so it needs to be changed in order to be softdevice compatible.

Cheers, Håkon

[hawk]

The code of SDK6.0 (uart_config function) has no code to set the interrupt priority.what's the default priority of NVIC_EnableIRQ(UART0_IRQn);

I will add new code "NVIC_SetPriority(UART0_IRQn, 3);"before ?NVIC_EnableIRQ(UART0_IRQn);" , and try again , report the test result.

[hawk]

hi, Håkon: thanks a lot. the code of uart_config() is the example without softdevice. so it hasn't the code to set the interrupt priority. if it work with softdevice. it must reset the interrupt priority (APP_IRQ_PRIORITY_LOW or APP_IRQ_PRIORITY_HIGH).

after adding the code of NVIC_SetPriority(UART0_IRQn,APP_IRQ_PRIORITY_LOW); it work fine with softdevice. thanks anyway.