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void Usart_init ( void )
{
COM0= AT91C_BASE_US0;
// Define RXD and TXD as peripheral
// Configure PIO controllers to periph mode
AT91F_PIO_CfgPeriph(
AT91C_BASE_PIOA, // PIO controller base address
((unsigned int) AT91C_PA5_RXD0 ) |
((unsigned int) AT91C_PA6_TXD0 ) , // Peripheral A
0 ); // Peripheral B// First, enable the clock of the PIOB
AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<// Usart Configure
AT91F_US_Configure (COM0, MCK,AT91C_US_ASYNC_MODE,USART_BAUD_RATE , 0);// Enable usart
COM0->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;// open Usart interrupt
AT91F_AIC_ConfigureIt (AT91C_BASE_AIC, AT91C_ID_US0, USART_INTERRUPT_LEVEL,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, Usart_c_irq_handler);
AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_US0);
// Set the PDC
AT91F_PDC_Open (AT91C_BASE_PDC_US0);
COM0->US_RPR = (unsigned int) buff_rx;
COM0->US_RCR = 100;
first = 0;
COM0->US_RTOR = 10;
// Enable USART IT error and AT91C_US_ENDRX
AT91F_US_EnableIt(COM0,AT91C_US_RXBUFF | AT91C_US_TIMEOUT );
}
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