edma_c.c

CCS开发的基于DSP的数据采集和显示程序

#include "typedefine.h"
#include "edma_c.h"
#include "interrupt_manage.h"

#pragma DATA_SECTION(s_nEdmaChLink,".qbss");
#pragma DATA_ALIGN(s_nEdmaChLink,8);
static uint8 s_nEdmaChLink[64];

#pragma DATA_SECTION(s_nFreeEdmaChHead,".qbss");
static uint8 s_nFreeEdmaChHead;


void InitEdma()
{
	int i;
	uint32 *pUint;
	// *** EDMA初始化 ***
	
//	IRQ_globalDisable_user();  //kang12.19
	
	pUint = (uint32*)EDMA_REG_BASE;
	// EDMA priority queue allocation registers
	pUint[_EDMA_PQAR0] = 6;
	pUint[_EDMA_PQAR1] = 12;
	pUint[_EDMA_PQAR2] = 12;
	pUint[_EDMA_PQAR3] = 12;
	// EDMA event enable registers
	pUint[_EDMA_EERL]  = 0;
	pUint[_EDMA_EERH]  = 0;
	// EDMA channel interrupt enable registers
	pUint[_EDMA_CIERL] = 0;			//0x0000a000;
	pUint[_EDMA_CIERH] = 0;
	// EDMA channel chain enable registers
	pUint[_EDMA_CCERL] = 0;			//0xfdf00e60;
	pUint[_EDMA_CCERH] = 0;			//0x000e0000;
	// EDMA event clear registers
	pUint[_EDMA_ECRL]  = 0xffffffff;
	pUint[_EDMA_ECRH]  = 0xffffffff;
	// EDMA channel interrupt pending registers
	pUint[_EDMA_CIPRL] = 0xffffffff;
	pUint[_EDMA_CIPRH] = 0xffffffff;
	// EDMA event enable registers
	pUint[_EDMA_EERL]  = 0;			//0xfdf7af70;
	pUint[_EDMA_EERH]  = 0;			//0x3f0f0e00;
//	
/*		 
	IRQ_map_user(8, 8);      // 必须先将特定的event map 给某 channel 后，下面的函数才能起作用
	IRQ_clear_user(8);       //
	IRQ_nmiEnable_user();	 //kang	12.19  使能EDMA中断
	IRQ_enable_user(8);     //

*/
	
	
	for(i=0;i<63;i++)
		s_nEdmaChLink[i] = i+1;
	s_nEdmaChLink[63] = 0xff;
	s_nFreeEdmaChHead = 0;

}

HANDLE AllocEdma(int nEdmaNum)
{
	HANDLE hFirst,hRet;
	uint32 *pUint;
	
	pUint = (uint32*)EDMA_REG_BASE;
	
	if(nEdmaNum <= 0)
		return INVALID_EDMA_HANDLE;
		
	hFirst = s_nFreeEdmaChHead;
	nEdmaNum--;
	
	while(hFirst != 0xff && nEdmaNum != 0)
	{
		hFirst = s_nEdmaChLink[hFirst];
		nEdmaNum--;
	}
	
	if(hFirst != 0xff && nEdmaNum == 0)
	{
		hRet = s_nFreeEdmaChHead;
		s_nFreeEdmaChHead = s_nEdmaChLink[hFirst];
		s_nEdmaChLink[hFirst] = 0xff;
		
		hFirst = hRet;
		while(hFirst != 0xff)
		{
			if(hFirst<32)
			{
				pUint[_EDMA_EERL]  |= (1<<hFirst);
				pUint[_EDMA_ECRL]  |= (1<<hFirst);
				if(hFirst != hRet)
					pUint[_EDMA_CCERL] |= (1<<hFirst);
			}
			else
			{
				pUint[_EDMA_EERH]  |= (1<<(hFirst-32));
				pUint[_EDMA_ECRH]  |= (1<<(hFirst-32));
				if(hFirst != hRet)
					pUint[_EDMA_CCERH] |= (1<<(hFirst-32));
			}
			hFirst = s_nEdmaChLink[hFirst];
		}
		return hRet;
	}
	else
	{
		return INVALID_EDMA_HANDLE;
	}
}