Quick Start Guide for PDC - Basic

A handler is required for the interrupt, below is a simple example:

void console_uart_irq_handler(void)
{
    /* Get UART status and check if PDC receive buffer is full */
    if ((uart_get_status(CONSOLE_UART) & UART_SR_RXBUFF) == UART_SR_RXBUFF) {
        /* Configure PDC for data transfer (RX and TX) */
        pdc_rx_init(g_p_uart_pdc, &g_pdc_uart_packet, NULL);
        pdc_tx_init(g_p_uart_pdc, &g_pdc_uart_packet, NULL);
    }
}

First initialise the board:

sysclk_init();
board_init();

Now setup the PDC registers:

/* Get pointer to UART PDC register base */
g_p_uart_pdc = uart_get_pdc_base(CONSOLE_UART);

/* Initialize PDC data packet for transfer */
g_pdc_uart_packet.ul_addr = (uint32_t) g_uc_pdc_buffer;
g_pdc_uart_packet.ul_size = BUFFER_SIZE;

/* Configure PDC for data receive */
pdc_rx_init(g_p_uart_pdc, &g_pdc_uart_packet, NULL);

/* Enable PDC transfers */
pdc_enable_transfer(g_p_uart_pdc, PERIPH_PTCR_RXTEN | PERIPH_PTCR_TXTEN);

Enable UART IRQ:

uart_enable_interrupt(CONSOLE_UART, UART_IER_RXBUFF);

Enable UART interrupt

NVIC_EnableIRQ(CONSOLE_UART_IRQn);

Once the required number of bytes have been transferred, an interrupt is triggered and the handler will run. The main program may execute other code or be busy-waiting:

while (1) {
}