Hi, I'm currently having a problem with the uart peripheral.
I have an STM32 MCU connected to the NRF52840. In this case, the NRF acts only as a "transceiver".
Whenever I receive data from the Bluetooth stack, I send it via UART.
Whenever I receive data from the UART peripheral, I send it via Bluetooth.
If the NRF is connected to bluetooth, it works as expected, but I can't receive data from UART when Bluetooth is not connected. I really need this because information that'll be shown in advertising will be received from the main MCU before anyone connects via Bluetooth.
I'm using the following softdevice: `s140_nrf52_7.2.0_softdevice`
I set up UART like:
uint32_t errorCode;
const app_uart_comm_params_t uartInit = {
.rx_pin_no = RX_PIN_NUMBER,
.tx_pin_no = TX_PIN_NUMBER,
.flow_control = APP_UART_FLOW_CONTROL_DISABLED,
.use_parity = false,
.baud_rate = NRF_UART_BAUDRATE_115200};
APP_UART_FIFO_INIT(&uartInit,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
Serial_SRV_Handler,
APP_IRQ_PRIORITY_LOWEST,
errCode);
My handler function is:
static void Serial_SRV_Handler(app_uart_evt_t *p_event) {
static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
static uint8_t index = 0;
switch (p_event->evt_type) {
case APP_UART_DATA_READY:
if (app_uart_get(&data_array[index]) == NRF_SUCCESS) {
// Do something with data... etc...
++index;
if (index >= BLE_NUS_MAX_DATA_LEN) {
index = 0;
}
}
break;
default:
break;
}
}
The problem is that this handler function only gets called when I'm connected via Bluetooth. By debugging, I can see that this function gets called all the way up from the UARTE_UART0 Interrupt. This interrupt, however, never happens if not connected to a Bluetooth device.
This problem makes no sense to me, I really don't know where things got tangled here....
