dma55x.c

Real-Time Digital Signal Processing Implementations, Applications, and Experiments with the TMS320C

/******************************************************************************/
/*  DMA55XX.C - DMA55XX routines .c file.                                     */
/*                                                                            */
/*     This module provides the devlib implementation for the DMAC            */
/*     on the TMS320C55XX DSP.                                                */
/*                                                                            */
/*  MACRO FUNCTIONS:                                                          */
/*                                                                            */
/*  FUNCTIONS:                                                                */
/*     dma_reset()       - Resets indicated DMA channel                       */
/*     dma_init()        - Initialize channel specific control registers      */
/*     dma_global_init() - Initialize global control registers.               */
/*     dma_reset_all()   - Resets all DMA channels                            */
/*                                                                            */
/*                                                                            */
/*  AUTHOR:                                                                   */
/*     Stefan Haas                                                            */
/*                                                                            */
/*  REVISION HISTORY:                                                         */
/*                                                                            */
/*    DATE       AUTHOR                       DESCRIPTION                     */
/*   -------   -------------      ------------------------------------------  */
/*   13OCT98   St Haas            Original.                                   */
/*                                                                            */
/******************************************************************************/
#include "dma55x.h"

      
/******************************************************************************/
/* FUNCTION DEFINITIONS                                                       */
/******************************************************************************/
#pragma CODE_SECTION(dma_reset, "DRV5510");
#pragma CODE_SECTION(dma_init, "DRV5510");
#pragma CODE_SECTION(dma_global_init, "DRV5510");
#pragma CODE_SECTION(dma_reset_all, "DRV5510");

/*****************************************************************************/
/*  dma_reset -  Reset DMA ch.                                               */
/*                                                                           */
/*     This function resets the specified DMA ch by initializing             */
/*     ch control registers to their default values                          */
/*                                                                           */
/*****************************************************************************/
void dma_reset(int ch)
{
	DMCCR(ch)   = 0;

	DMCSDP(ch)  = 0;
	DMCICR(ch)  = 0;

	DMCSSAL(ch) = 0;
	DMCSSAU(ch) = 0;
	DMCDSAL(ch) = 0;
	DMCDSAU(ch) = 0;
	
	DMCEN(ch)   = 0;
	DMCFN(ch)   = 0;
	DMCEI(ch)   = 0;
	DMCFI(ch)   = 0;
}  

                       
/****************************************************************************/
/* dma_init -  Initialize ch specific control registers.					*/
/*                                                                          */
/*     This function is responsible for setting the DMA control registers,  */
/*     source address, destination address and the corresponding pages      */
/*     transfer count for the specified DMA ch.								*/
/*                                                                          */
/****************************************************************************/               
void dma_init(PDma55xConfig pDma)
{
	DMCCR(pDma->ch) = DMCCR(pDma->ch) & ~(1<<DM_EN);

	DMCSDP(pDma->ch) = pDma->csdp;
	DMCICR(pDma->ch) = pDma->cicr;

	DMCSSAL(pDma->ch) = pDma->srcl;
	DMCSSAU(pDma->ch) = pDma->srch;
	DMCDSAL(pDma->ch) = pDma->dstl;
	DMCDSAU(pDma->ch) = pDma->dsth;

	DMCEN(pDma->ch) = pDma->elem;
	DMCFN(pDma->ch) = pDma->frame;
	DMCEI(pDma->ch) = pDma->elemi;
	DMCFI(pDma->ch) = pDma->framei;

	DMCCR(pDma->ch) = pDma->ccr;
}


/****************************************************************************/
/* dma_global_init -  Initialize global control registers.                  */
/*                                                                          */
/*     This function is responsible for setting the DMA global control      */
/*     register                                                             */
/****************************************************************************/
void dma_global_init(unsigned int gcr)
{
	DMGCR = gcr;
}


/*****************************************************************************/
/* dma_reset_all -  Reset all DMA channels.                                  */
/*                                                                           */
/*     This function resets all DMA channels by initializing                 */
/*     ch control registers to their default values                          */
/*                                                                           */
/*****************************************************************************/
void dma_reset_all( void )
{
	unsigned int ch;
	
	for (ch = 0;ch < 5; ch++)
		dma_reset(ch);
	
	DMGCR = 0x0000;
}          

#undef __INLINE