void ConfigureUsart0(void)
{
    unsigned int mode = AT91C_US_USMODE_NORMAL
                        | AT91C_US_CLKS_CLOCK
                        | AT91C_US_CHMODE_NORMAL
                        | AT91C_US_CHRL_8_BITS
                        | AT91C_US_PAR_NONE
                        | AT91C_US_NBSTOP_1_BIT;

    // Enable the peripheral clock in the PMC
    PMC_EnablePeripheral(AT91C_ID_US0);

    // Configure the USART in the desired mode @115200 bauds
    CurrentBaudRate = 115200;
    USART_Configure(AT91C_BASE_US0, mode, CurrentBaudRate, BOARD_MCK);

    // Configure the RXBUFF interrupt

    AIC_ConfigureIT(AT91C_ID_US0, 0x20, ISR_Usart0);    // Прерывание по фронту
    AIC_EnableIT(AT91C_ID_US0);

    // Enable receiver & transmitter
    USART_SetTransmitterEnabled(AT91C_BASE_US0, 1);
    USART_SetReceiverEnabled(AT91C_BASE_US0, 1);
}

void UsartPioConfig(void)
{ PIO_Configure(pPinsUT, PIO_LISTSIZE(pPinsUT)); }


//--------

UsartPioConfig();     // Конфигурирование пинов для usart

ConfigureUsart0();    // Параметры связи: 115200, 8n1.

AT91C_BASE_US0->US_CR = AT91C_US_RSTSTA;
AT91C_BASE_US0->US_IER = AT91C_US_RXRDY | AT91C_US_TXRDY;