sport.c

TI DSP C6713 同相同公司C2812利用MSBSP多功能串口通讯的实例

/*msg pingpong mechanism version
data: 2003/10
*/

#ifndef _SPORT_H_
#include "sport.h"
#endif

                                           

const unsigned char McBSPx_EDMA_Ch[3] = {12,14,17};
const unsigned char McBSPr_EDMA_Ch[3] = {13,15,18};



/*-------------------------------------------------------------------------*/
/* mcbsp_init() -                                		*/
/*-------------------------------------------------------------------------*/
/*
803VER20040420 old version
void mcbsp_init(unsigned int ch, unsigned int ClkGdv)

modefied by shiyan 2004/10/25
void mcbsp_init(unsigned int ch, unsigned int ClkGdv, unsigned int cnt)
cnt is the size in INT32 of the packet 
*/
void mcbsp_init(unsigned int ch, unsigned int ClkGdv, unsigned int cnt)
{
	int wait;
	volatile McBSP_REG * mcbsp;
	
  	mcbsp = (volatile McBSP_REG *)(McBSP_BASE_ADDR(ch));
  	
  	mcbsp->SPCR = 0;         /* reset serial port     */

/*********************************************************************************/
/*modefied by shiyan at 11/6/2003*/  	
	mcbsp->SRGR = ((1<<CLKSM) + (0<<FSGM) +
					(320<<FPER) + (ClkGdv<<CLKGDV));

//	mcbsp->SRGR = ((1<<CLKSM) + (0<<FSGM) +
//			((ELEMENT_SIZE*MSG_SIZE-1)<<FPER) + (ClkGdv<<CLKGDV));
/*********************************************************************************/
												
	mcbsp->PCR = ((1<<FSXM) + (1<<CLKXM)
					+(0<<FSRM) + (0<<CLKRM));
	
//	mcbsp->XCR = ((1<<FIG) + (5<<WDLEN1) + 
//				((MSG_SIZE-1)<<FRLEN1) + (0<<DATDLY)); 

//	mcbsp->RCR = ((1<<FIG) + (5<<WDLEN1) + 
//  				((MSG_SIZE-1)<<FRLEN1) + (0<<DATDLY));    

	mcbsp->XCR = ((1<<FIG) + (5<<WDLEN1) + 
				((cnt-1)<<FRLEN1) + (0<<DATDLY)); 

	mcbsp->RCR = ((1<<FIG) + (5<<WDLEN1) + 
  				((cnt-1)<<FRLEN1) + (0<<DATDLY));    
	
	mcbsp->MCR = 0;
	mcbsp->SPCR |= (1<<GRST);
	for (wait=0; wait<0x10; wait++);

	mcbsp->SPCR |= ((1<<FREE)+(1<<FRST));
}



/*-------------------------------------------------------------------------*/
/* evt_edma_init() - used to initiate channel  EDMA         
read size 32bit from a FIFO to a ram              */
/*modefied by shiyan at 11/6/2003*/ 
/*-------------------------------------------------------------------------*/
int SPORT_edmar_init(int dst, unsigned int MsBSP_ch, int size)
{ 
	unsigned char DMA_ch;
	volatile EDMA_REG  *EDMA_reg ;
	
	if((MsBSP_ch >= McBSP_CHANNEL_NUM))
		return 0;

	DMA_ch = McBSPr_EDMA_Ch[MsBSP_ch];
	
   	EDMA_reg = (volatile EDMA_REG  *)EVENT_PARAMS_ADDR(DMA_ch);
	*(unsigned volatile int *)ECRL |= (1<<DMA_ch);		//Clear all pending events
	
	//Config the EDMA Channel 	EDMA Transfer Parameters
	EDMA_reg->opt = ((2<<PRI) + (0<<ESIZE) + 
					(0<<DS) + (0<<SUM) + 
					(0<<DD) + (1<<DUM) +
				 (1<<TCINT) + ((DMA_ch%16)<<TCC) + ((MsBSP_ch>>1)<<TCCM) +
				(0<<LINK) + (0<<FS) );
	EDMA_reg->src = SP_MEM_ADDR(MsBSP_ch);
	EDMA_reg->cnt = size;
	EDMA_reg->dst = dst;
	EDMA_reg->idx = 0x00000000;
	EDMA_reg->lnk = 0;
	
//	EDMA_reg->lnk = ((0xffff& NULL_PARAMS_ADDR));
	
	*(unsigned volatile int *)CIERL |= (1<<DMA_ch);		//Enable EDMA Done INT 
	*(unsigned volatile int *)EERL |= (1<<DMA_ch);	//only enable EVENT ch
	return 1;
}


int SPORT_edmax_init(int src, unsigned int MsBSP_ch, int size)
{ 
	unsigned char DMA_ch;
	volatile EDMA_REG  *EDMA_reg ;
	
	if((MsBSP_ch >= McBSP_CHANNEL_NUM))
		return 0;

	DMA_ch = McBSPx_EDMA_Ch[MsBSP_ch];
 	EDMA_reg = (volatile EDMA_REG  *)EVENT_PARAMS_ADDR(DMA_ch);
	*(unsigned volatile int *)ECRL |= (1<<DMA_ch);		//Clear all pending events

	EDMA_reg->opt = ((2<<PRI) + (0<<ESIZE) + 
					(0<<DS) + (1<<SUM) + 
					(0<<DD) + (0<<DUM) +
				 (0<<TCINT) + ((DMA_ch%16)<<TCC) + ((MsBSP_ch>>1)<<TCCM) +
				 (1<<LINK) + (0<<FS) );

	EDMA_reg->src = src;
	EDMA_reg->cnt = size;
	EDMA_reg->dst = SP_MEM_ADDR(MsBSP_ch);
	EDMA_reg->idx = 0x00000000;
	EDMA_reg->lnk = ((0xffff& NULL_PARAMS_ADDR));

	*(unsigned volatile int *)EERL |= (1<<DMA_ch);	//only enable EVENT ch
	return 1;
}