interrupt_usart.c

Embest ATEB9200开发板部分测试程序。

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : interrupt_Usart.c
//* Object              : USART Interrupt Management
//*
//* 1.0 03/Jun/03 JPP   : Creation
//*----------------------------------------------------------------------------

// Include Standard LIB  files 
#include "AT91RM9200.h"


#define	MCK	18432000

extern void usart_asm_irq_handler(void);
#define USART_INTERRUPT_LEVEL		7

static const char atmel_header[]=
{
"\n\r  *** ATMEL Usart IRQ ***\n\r"
"Copyright (C) 2003 ATMEL Corporations Version: 1.0\n\r"
};

char message[80];
AT91PS_USART COM0;

//*------------------------- Internal Function --------------------------------
//*------------------------- Interrupt Function -------------------------------

//*----------------------------------------------------------------------------
//* Function Name       : Usart_c_irq_handler
//* Object              : C handler interrupt function called by the interrupts 
//*                       assembling routine
//* Input Parameters    : <RTC_pt> time rtc descriptor
//* Output Parameters   : increment count_timer0_interrupt
//*----------------------------------------------------------------------------
void Usart_c_irq_handler(AT91PS_USART USART_pt)
{
	unsigned int status;
	//* get Usart status register
	status = USART_pt->US_CSR;
	if ( status & AT91C_US_ENDRX){
		//* Acknowledge Interrupt
		 	AT91F_US_ReceiveFrame(USART_pt,(char *)message,10,0,0);         
		//* Get byte and send	
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "ENDRX\n\r",7,0,0);
	}
	// check if interrupt is present and available 
	if ( (status & AT91C_US_ENDTX) &  (USART_pt->US_IMR & AT91C_US_ENDTX) ){
		 //*  Acknowledge Interrupt by mask for next send
		 AT91F_US_DisableIt(USART_pt, AT91C_US_ENDTX );
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "ENDTX\n\r",7,0,0);
	}
	// check if interrupt is present and available 
	if ( (status & AT91C_US_TXBUFE) &  (USART_pt->US_IMR & AT91C_US_TXBUFE) ){
		 //*  Acknowledge Interrupt by mask for next send
		 AT91F_US_DisableIt(USART_pt, AT91C_US_TXBUFE );
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "TXBUFE\n\r",8,0,0);
	}
	
	if ( status & AT91C_US_OVRE) {
		//* clear US_RXRDY
		 AT91F_US_GetChar(USART_pt);
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "O",1,0,0);
	}

	//* Check error
	if ( status & AT91C_US_PARE) {
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "P",1,0,0);
	}

	if ( status & AT91C_US_FRAME) {
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "F",1,0,0);
	}

	if ( status & AT91C_US_TIMEOUT){
		USART_pt->US_CR = AT91C_US_STTTO;
   		//* Trace on DBGU
    		AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "T",1,0,0);
	}

	//* Reset the satus bit
	 USART_pt->US_CR = AT91C_US_RSTSTA;
}
//*-------------------------- External Function -------------------------------

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_Printk
//* \brief This function is used to send a string through the US1 channel 
//*----------------------------------------------------------------------------
void AT91F_US_Printk( char *buffer) // \arg pointer to a string ending by \0
{
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady(COM0));
		AT91F_US_PutChar(COM0, *buffer++);
	}
}
//*----------------------------------------------------------------------------
//* \fn    AT91F_US_Print_frame
//* \brief This function is used to send a Frame through the US1 channel 
//*----------------------------------------------------------------------------
void AT91F_US_Print_frame(char *buffer, unsigned short counter) // \arg pointer to a string ending by \0
{
    //* Enable USART IT error and AT91C_US_ENDRX
 	AT91F_US_SendFrame(COM0,buffer,counter,0,0);
 	//* enable IT
 	AT91F_US_EnableIt(COM0, AT91C_US_ENDTX );
}
//*----------------------------------------------------------------------------
//* \fn    AT91F_US_Print_2_frame
//* \brief This function is used to send a Frame through the US1 channel 
//* (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_US_Print_2_frame(char *buffer, unsigned short counter,char *buffer2,unsigned short counter2) // \arg pointer to a string ending by \0
{
    //* Enable USART IT error and AT91C_US_ENDRX
 	AT91F_US_SendFrame(COM0,buffer,counter,buffer2,counter2);
 	//* enable IT
 	AT91F_US_EnableIt(COM0, AT91C_US_ENDTX |AT91C_US_TXBUFE);
}
//*----------------------------------------------------------------------------
//* Function Name       : Usart_init
//* Object              : USART initialization 
//* Input Parameters    : none
//* Output Parameters   : TRUE
//*----------------------------------------------------------------------------
void Usart_init ( void )
//* Begin
{
	
	COM0= AT91C_BASE_US1;

        //* Define RXD and TXD as peripheral
        AT91F_PIO_CfgPeriph(AT91C_BASE_PIOB,AT91C_PB21_RXD1 | AT91C_PB20_TXD1,0);

    	// First, enable the clock of the PIOB
    	AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<<AT91C_ID_US1 ) ;
	
	// Usart Configure
	AT91F_US_Configure (COM0, MCK,AT91C_US_ASYNC_MODE, 115200, 0);
	
	// Enable usart 
	COM0->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
    	
    //* Enable USART IT error and AT91C_US_ENDRX
    	AT91F_US_EnableIt(COM0,AT91C_US_TIMEOUT | AT91C_US_FRAME | AT91C_US_OVRE |AT91C_US_ENDRX);

    	//* open Usart 1 interrupt
	AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_US1, USART_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE, usart_asm_irq_handler); 
	AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_US1); 

	//* set time out US_RTOR
   //* Arm time out after 255 * 4  bits time 
   //* for 115200 bit time = 1/115200 = 8.6 micro sec time out unuti= 4* 8.6 = 34 micro
   //* 
	COM0->US_RTOR = 0xFFFF;
   // *Enable usart SSTO
	COM0->US_CR = AT91C_US_STTTO;

	
	AT91F_US_PutChar (COM0,'X');
	
    //* Enable USART IT error and AT91C_US_ENDRX
 	AT91F_US_ReceiveFrame(COM0,(char *)message,10,0,0);
   	AT91F_US_EnableIt(COM0,AT91C_US_ENDRX);

    //* first
 	AT91F_US_SendFrame(COM0,(char *)atmel_header,sizeof(atmel_header),0,0);
   	AT91F_US_EnableIt(COM0, AT91C_US_ENDTX );
	
//* End
}