#include <...> // Все инклуды

volatile int dma_complete = 0;
char msg[6] = "Hello";
char msg_input[10];
alt_dma_txchan DMA_UART_TX;

// Регистрируем прерывание UART
static void UART_interrupt (void* context, alt_u32 id) __attribute__((section (".exceptions")));
static void UART_interrupt (void* context, alt_u32 id)
{
    alt_u16 status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);
    IOWR_ALTERA_AVALON_UART_STATUS(UART_BASE, 0);
       // Обработка UART
}

static void init_uart (void* base, alt_u32 irq_controller_id, alt_u32 irq)
{
    alt_ic_isr_register (irq_controller_id, irq, UART_interrupt, base, NULL);
}


// Прерывание DMA_1
static void DMA_1_interrupt (void* handle) __attribute__((section (".exceptions")));
static void DMA_1_interrupt (void* handle)
{
    dma_complete = 1;
}

int main()
{
    init_uart ((void *)UART_BASE, UART_IRQ_INTERRUPT_CONTROLLER_ID, UART_IRQ);
    alt_ic_irq_enable(UART_IRQ_INTERRUPT_CONTROLLER_ID, UART_IRQ);
    printf("Init UART\n");

    DMA_UART_TX = alt_dma_txchan_open (DMA_1_NAME);
    if (DMA_UART_TX == NULL) printf("DMA open error\n");
    else
    {
        if (alt_dma_txchan_ioctl (DMA_UART_TX, ALT_DMA_SET_MODE_8, NULL) < 0) printf ("Failed to set ALT_DMA_SET_MODE_8");
        if (alt_dma_txchan_ioctl (DMA_UART_TX, ALT_DMA_TX_ONLY_ON, (void *)UART_BASE + 1) < 0) printf ("Failed to set ALT_DMA_TX_ONLY_ON");

        int dma_tx_done = alt_dma_txchan_send(
            DMA_UART_TX,
            msg,
            sizeof(msg),
            DMA_1_interrupt,
            NULL
        );

        if (dma_tx_done < 0) printf("DMA TX error %d\n", dma_tx_done);
    }

    while(1)
    {
        if (dma_complete)
        {
            printf("DMA transferred\n");
            if (alt_dma_txchan_ioctl (DMA_UART_TX, ALT_DMA_TX_ONLY_OFF, NULL) < 0) printf ("Failed to set ALT_DMA_TX_ONLY_OFF");
            dma_complete = 0;
        }
    }
    return 0;
}