Related UART

[Alan Ajit]

Dear nordic,

I implemented a uart in BLE application its works fine.

I need to reduce current for that i enable and disable uart but when i call function disabled or enabled function the uart stops working. can you help me to solve this ?

Uart init function:-

void uart_init(void)
{
uint32_t                     err_code;
    app_uart_comm_params_t const comm_params =
    {
        .rx_pin_no    = RX_PIN_NO,
        .tx_pin_no    = TX_PIN_NO,
        .rts_pin_no   = RTS_PIN_NO,
        .cts_pin_no   = CTS_PIN_NO,
        .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
        .use_parity   = false,
#if defined (UART_PRESENT)
        .baud_rate    = NRF_UART_BAUDRATE_57600
#else
        .baud_rate    = NRF_UART_BAUDRATE_57600
#endif
    };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}

Uart enable and disable:-

oid Disable_Uart(void)
{
	
NRF_UARTE0->TASKS_STOPTX = 1;
NRF_UARTE0->TASKS_STOPRX = 1;
NRF_UARTE0->ENABLE = 0;
	
	
}

void Enable_Uart(void)
{
	
NRF_UARTE0->ENABLE = 1;
NRF_UART0->TASKS_STARTTX = 1;
NRF_UART0->TASKS_STARTRX = 1;
	
}

I need a help to solve this why my uart stops when i call enable or disable function?

[Jørgen Holmefjord]

Hi,

The UARTE peripheral is not enabled by writing 1 to the ENABLE register, you need to write 8 to enable it. Note that the UART peripheral (without EasyDMA) is enabled by writing 4 to the ENABLE register.

Best regards,
Jørgen