static uint32_t readline()

in port/espressif/src/boot_serial_port.c [92:121]

• 22 lines of code
• 5 McCabe index (conditional complexity)

static uint32_t readline( uint8_t * buf, uint32_t cap )
{
    volatile uint32_t len = 0;
    volatile uint32_t n_read = 0;
    volatile bool stop = false;

    static uart_dev_t * pxUART = &UART1;

    do
    {
        len = uart_ll_get_rxfifo_len( pxUART );

        for( uint32_t i=0; i<len; i++ )
        {
            uart_ll_read_rxfifo( pxUART, &buf[n_read], 1u );
            n_read++;

            /* Stop at capacity or once full packet is ingested */
            if( n_read == cap || buf[n_read-1] == '\n' )
            {
                stop = true;
            }
        }

        esp_rom_delay_us( 1000u );
    } while( !stop );


    return n_read;
}