...


#define BR0    38400                         /* Baud Rate */
#define BR1    9600


...


// ++++++++++++++++++   Function: Usart_Init( void )   ++++++++++++++++

void Usart_Init( void ) {                    /* Initialize Serial Interface */

   *AT91C_PIOA_PDR = AT91C_PA5_RXD0 |        /* Enable RxD0 Pin */
                     AT91C_PA6_TXD0 |        /* Enalbe TxD0 Pin */
                     AT91C_PA21_RXD1|        /* Enable RxD1 Pin */
                     AT91C_PA22_TXD1;        /* Enalbe TxD1 Pin */
 
   pUSART->US_CR = AT91C_US_RSTRX |          /* Reset Receiver      */
                   AT91C_US_RSTTX |          /* Reset Transmitter   */
                   AT91C_US_RXDIS |          /* Receiver Disable    */
                   AT91C_US_TXDIS;           /* Transmitter Disable */ 

   pUSART1->US_CR = AT91C_US_RSTRX |         /* Reset Receiver      */
                    AT91C_US_RSTTX |         /* Reset Transmitter   */
                    AT91C_US_RXDIS |         /* Receiver Disable    */
                    AT91C_US_TXDIS;          /* Transmitter Disable */ 

   pUSART->US_MR = AT91C_US_USMODE_NORMAL |  /* Normal Mode */
                   AT91C_US_CLKS_CLOCK    |  /* Clock = MCK */
                   AT91C_US_CHRL_8_BITS   |  /* 8-bit Data  */
                   AT91C_US_PAR_NONE      |  /* No Parity   */
                   AT91C_US_NBSTOP_1_BIT;    /* 1 Stop Bit  */

   pUSART1->US_MR = AT91C_US_USMODE_NORMAL |  /* Normal Mode */
                    AT91C_US_CLKS_CLOCK    |  /* Clock = MCK */
                    AT91C_US_CHRL_8_BITS   |  /* 8-bit Data  */
                    AT91C_US_PAR_NONE      |  /* No Parity   */
                    AT91C_US_NBSTOP_2_BIT;    /* 2 Stop Bits  */

   pUSART->US_BRGR = BRD0;                    /* Baud Rate Divisor */

   pUSART1->US_BRGR = BRD1;

   pUSART->US_CR  = AT91C_US_RXEN  |          /* Receiver Enable     */
                    AT91C_US_TXEN;            /* Transmitter Enable  */
   pUSART1->US_CR = AT91C_US_RXEN  |          /* Receiver Enable     */
                    AT91C_US_TXEN;            /* Transmitter Enable  */

}



// ++++++++   Function: Receive_LowByte ( void )   +++++++++

void Receive_LowByte ( void )
{
   Digital_T_Value_New_flag   = 0;
   Digital_E_Value_New_flag   = 0;
   LowByte  = pUSART1->US_RHR ; 
}



// ++++++++   Function: Receive_HighByte ( void )   +++++++++

void Receive_HighByte ( void )
{

   HighByte  = pUSART1->US_RHR ; 
   
   Digital_E_Buffer = HighByte ;
   Digital_T_Buffer = LowByte ;
   Digital_E_Value_New_flag    = 1;
   Digital_T_Value_New_flag    = 1;

}