RE: How can I check printf's buffer?

Nick_RA — Tue, 06 Dec 2022 16:35:30 GMT

OK thanks. I'll probably use a housekeeping timer ISR anyway so I'll put a timeout on it which I can reset when I print.

RE: How can I check printf's buffer?

Vidar Berg — Tue, 06 Dec 2022 13:53:07 GMT

Hi Nick,

The app uart libary used by retarget.c does not expose an API to check if there are pending TX transfers. So, the simplest solution is probably to add a small busy-wait (nrf_delay_ms(), etc) before you disable the peripheral. Otherwise, you would have to modify app_uart_fifo.c to include a function to check if there are bytes left in the TX fifo.

Possibly something like this:

bool app_uart_tx_in_progress(void)
{
    bool fifo_empty = false;
    uint32_t size;

    if (FIFO_LENGTH(m_tx_fifo) == 0)
    {
        fifo_empty = true;
    }
    
    return (fifo_empty == false);
}

Best regards,

Vidar