uart.c

This project contains code for testin realloc api tested in fre rtos ported to AT91SAM7x256.the code

/* Standard includes. */
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>


/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"

/* application includes. */
#include "uip_task.h"
#include "Board.h"
#include "App.h"


extern void UARTisr_entry( void );
__arm void UART_isr( void );

extern unsigned int ISR_flag ;
/*----------------------------------------------------------------------------*/
void UART0_init ( void ){
  
    AT91C_BASE_AIC->AIC_EOICR = 0;      // When using the JTAG debugger the hardware is not always initialised to
	                                //    the correct default state.  This line just ensures that this does not
	                                //    cause all interrupts to be masked at the start. 
    //--------------------UART0 INIT --------------------------
    AT91C_BASE_PMC->PMC_PCER   = (1 << AT91C_ID_US0);           
    AT91C_BASE_PIOA->PIO_PDR   = BSP_GPIOA_UART0; 
    AT91C_BASE_PIOA->PIO_PDR   = BSP_GPIOA_UART0;
    AT91C_BASE_US0->US_IDR     = AT91C_US_TXRDY;                 
    AT91C_BASE_US0->US_IER     = AT91C_US_RXRDY;
    AT91C_BASE_US0->US_CR      = AT91C_US_RXEN                  
                               | AT91C_US_TXEN;                 
    AT91C_BASE_US0->US_MR      = AT91C_US_USMODE_NORMAL         // RS232C mode selected 
                               | AT91C_US_CLKS_CLOCK            // USART input CLK is MCK 
                               | AT91C_US_CHRL_8_BITS           // 8 bit data to be sent 
                               | AT91C_US_PAR_NONE              // No parity bit selected 
                               | AT91C_US_NBSTOP_1_BIT;         // 1 stop bit selected 
    AT91C_BASE_US0->US_BRGR    = (CPU_INT16U)((MCK) / 115200 / 16);// Set the USART baud rate 
    AT91C_BASE_AIC->AIC_IDCR  |= (1 << AT91C_ID_US0);         //disabling interrupts .
    AT91C_BASE_AIC->AIC_SVR[AT91C_ID_US0] = (signed int)UARTisr_entry  ;   //passing the handler address.
    AT91C_BASE_AIC->AIC_SMR[AT91C_ID_US0] = 0X00000007;                    //+ve edge  TRIGGER AND PRIORITY 7 (ITS given highets priority).
    AT91C_BASE_AIC->AIC_IECR              |= (1 << AT91C_ID_US0);         //Enable interrupts .
}
//--------------------------------------------------------------
void  UART0_WrByte(CPU_INT08U tx_byte)
{
  while(  !(AT91C_BASE_US0->US_CSR & AT91C_US_TXRDY));
    AT91C_BASE_US0->US_THR = tx_byte;
}
//--------------------------------------------------------------
void  UART0_Printk(char *format, ...)
{
  static char buffer[80 + 1];
  unsigned char *tx_str;
  
  va_list   vArgs;
  va_start(vArgs, format);
  vsprintf((char *)buffer, (char const *)format, vArgs);
  va_end(vArgs);
  
  tx_str = (unsigned char*) buffer ;
  while ((*tx_str) != 0) {
        UART0_WrByte(*tx_str++);
  }
}
//------------------------------------------------
__arm void UART_isr( void ){
    static int  irq_id;
    char temp0;
    AT91C_BASE_AIC->AIC_IVR = 0  ;                    
    irq_id  = AT91C_BASE_AIC->AIC_ISR & 0x1F;         
    AT91C_BASE_AIC->AIC_ICCR |=  (1 << irq_id);       
    temp0    =   (char)AT91C_BASE_US0->US_RHR; 
        temp0++;                                          
    ISR_flag = irq_id ;                               
    AT91C_BASE_AIC->AIC_EOICR = 0;
    AT91C_BASE_AIC->AIC_ICCR |= (1 << irq_id);     
}
//-----------------------------------------------