3 years, 1 month ago.

Handling F746 UART Rx Interrupts

How do I disable/enable UART receive interrupts in a F746NG? In the ISR example below for the K64F (LPC1768 version commented out) I do the following:

1. Disable the UART interrupt

2. Process RX characters

3. Enable the UART interrupt again

4. Exit ISR

void PcRxIRQ(void)
    NVIC_DisableIRQ(UART0_RX_TX_IRQn);  //n=0, 1 or 2  Disable Rx interrupt on k64f
    //LPC_UART0->IER = 0;                 //Disable Rx interrupt on mbed1768

    while (pc.readable()) {
        inchar = pc.getc();            //get a character
        PcRxChar(inchar);              //go process char


    NVIC_EnableIRQ(UART0_RX_TX_IRQn);  //n=0, 1 or 2  Re-enable Rx interrupt on k64f
    //LPC_UART0->IER = 1;                //RE-enable Rx interrupt on mbed1768

Question relating to:

The STM32F746G-DISCO discovery board (32F746GDISCOVERY) is a complete demonstration and development platform for STMicroelectronics ARM® Cortex®-M7 core-based STM32F746NGH6 microcontroller.
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1 Answer

3 years, 1 month ago.

There is no reason why you would need to disable the interrupt while processing the current interrupt. It simply is not capable of interrupting its own interrupt handler.

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