dec6713_uart.c

合众达6713DSP开发板串口编程

/*********************************************************************************
* DEC6713_UART.C	v2.00	     							                            *
* Copyright	2003 by SEED Electronic Technology Ltd.
* All rights reserved. Property of SEED Electronic Technology Ltd.			                *
* Designed by:	Hongshuai.Li
* Discription:Operation mode is FIFO.
* 05.10.2005	
*********************************************************************************/
#include <csl.h>
#include <csl_irq.h>
#include "DEC6713.h"
#include "uartn.h"
#include <stdio.h>
/********************************************************************************/



#define LENGTH 160

Uint32 UART_Handle;
Uint32 UARTA_Handle;		//added on 03.04.2005
Uint32 UARTB_Handle;
Uint8 RevBuffer_A[160];
Uint8 RevBuffer_B[160];
Uint16 i;
Uint8 int_flag = 1;
Uint8 TempData;
Uint16 BaudRate;
Uint8 reg_data=0;
Uint8 Lth = 0;

Uint8 RcountA =0;
Uint8 RcountB =0;
Uint8 ScountA =0;
Uint8 ScountB =0;
Uint8 ReVal = 0;
#pragma DATA_SECTION(uart_ab_channel_select,".uart_var");
unsigned char uart_ab_channel_select = 0;
/********************************************************************************/
void init_uart();		//added on 03.04.2005
extern far void vectors();
main()
{

	/* Initialize the chip support library, must when using CSL */
  	CSL_init(); 
	/*Initialize DEC6713 board.*/
	DEC6713_init();
	
	/*Initialize receive buffer.*/
	for(i=0;i<LENGTH;i++)
		RevBuffer_B[i] = 0;

	/* Disable interrupt. */
	IRQ_globalDisable();
	IRQ_RSET(EXTPOL,0x0F);
	IRQ_setVecs(vectors);
	IRQ_map(IRQ_EVT_EXTINT6,6);
	IRQ_disable(IRQ_EVT_EXTINT6);
	IRQ_clear(IRQ_EVT_EXTINT6);
	
	/*Open UART. */
	init_uart();
	
	/* Enable interrupt */
	IRQ_enable(IRQ_EVT_EXTINT6);
	IRQ_globalEnable();
	IRQ_nmiEnable();
	
	
	for(;;)
	{
	/*Transmit received data to PC.*/
		if(ScountB != RcountB)
		{

			TempData = UART_rget(UARTB_Handle,UART_LSR);
			if(TempData&0x40 == 0x40)
			{
				for(i=0; i<FIFO_Length; i++)
				{
					UART_rset(UARTB_Handle,UART_THR, RevBuffer_B[ScountB]);
				}
				ScountB++;
				if(ScountB ==160)
				{
						ScountB = 0;
				}
			}
		}
	}
}
/********************************************************************************\
\*UART initialize routine	*\		//added on 03.04.2005
\********************************************************************************/
void init_uart()
{
		/* Initialize uart_b */
		UARTB_Handle = UART_open(UART_B);
		BaudRate = baud_19k2;
		UART_setup(UARTB_Handle,BaudRate,
					data_w8,
					data_s1,
					0,
					0x07,
					0x08);
					
		/* Clear RHR and LSR registers. */	
		TempData = UART_rget(UARTB_Handle,UART_RHR);
		TempData = UART_rget(UARTB_Handle,UART_LSR);
	
		/* Setup UARTA interrupt. */
     	UART_IntSetup(UARTB_Handle,uartint_rhr);
}

/********************************************************************************\
\*	-UART interrupt handle function.
\*Parameters:
\*
\*Return:
\********************************************************************************/

interrupt void
c_int6(void)
{
	/*Receive data and save in data_buffer.*/
	reg_data = DEC6713_cpld_rget(DEC6713_INTSTAT_REG);
    // Receive UARTb data
	if((reg_data & 0x60) == 0x40)
	{
		TempData = UART_rget(UARTB_Handle,UART_LSR);
		if((TempData&0x01) == 0x01)
		{	
		
			for(i=0;i<FIFO_Length;i++)
			{
				RevBuffer_B[RcountB]=UART_receive_single(UARTB_Handle);
			}
			RcountB++;
			if(RcountB == 160) RcountB =0;
		}
		
		else
		{
			UART_rset(UARTB_Handle,UART_FCR,0x02);
		}
				
	}	
	int_flag = 0;
	return;
}
/********************************************************************************/
/*	End of DEC6713_UART.C */
/********************************************************************************/