dec6713_edma.c

SEED TMS320C6713开发板EDMA的源代码

/*********************************************************************************
* Copyright	2003 by SEED Electronic Technology Ltd.
* All rights reserved. Property of SEED Electronic Technology Ltd.			                *
* Designed by:	Hongshuai.Li								                                *
*********************************************************************************/ 
/* FILENAME...... DEC6713_EDMA.c
* DATE CREATED.. 21/12/2004
* LAST MODIFIED. 21/12/2004
*------------------------------------------------------------------------------
* This program uses the timer to trigger EDMA events. These events in turn 
* trigger linked EDMA parameter tables to fill a ping pong buffer structure. 
* On running the program you'll note that the program bounces between the ping 
* and pong buffers filling each with a value that comes from the source.  
* (Note: This example runs with CACHE enable). 
\******************************************************************************/
#include <stdio.h>

#include <csl.h>
#include <csl_cache.h>
#include <csl_edma.h>
#include <csl_timer.h>
#include <csl_irq.h>
#include <DEC6713.h>

/*----------------------------------------------------------------------------*/
/* Pick which EDMA transfer completion interrupt we want to use */
#define TCCINTNUM   10

/* define the constants */
#define BUFF_SZ      256              /* ping-pong buffer sizes in # of ints  */
#define FCPU         150000000        /* CPU clock frequency                  */
#define SRATE        8000             /* data sample rate (simulated w/timer  */
#define TPRD         (FCPU/(4*SRATE)) /* timer period                         */
#define TRANSFER_CNT 20               /* Transfer count */

/* Create the buffers. We want to align the buffers to be cache friendly */
/* by aligning them on an L2 cache line boundary.                        */
#pragma DATA_ALIGN(ping,128);
#pragma DATA_ALIGN(pong,128);
#pragma DATA_ALIGN(outbuff,128);
int ping[BUFF_SZ];
int pong[BUFF_SZ];
int outbuff[BUFF_SZ];

/* These two variables serve as the data sources for this example. */
/* Also want to align these on a cache line boundary since they    */
/* sources of EDMA transfers.                                      */
#pragma DATA_ALIGN(ping_data,128);
#pragma DATA_ALIGN(pong_data,128);
static int ping_data;
static int pong_data;

/* global variable used to track the ping-pong'ing */
static int pingpong = 0;

volatile int transferCount = 0;

extern far void vectors();

void setupInterrupts(void);
void stopEdma(void); /* function used to stop EDMA */

/*-------------------------------------------------------------------------*/
/* declare the CSL objects */
TIMER_Handle hTimer;   /* Handle for the timer device                 */
EDMA_Handle hEdma;     /* Handle for the EDMA channel                 */
EDMA_Handle hEdmaPing; /* Handle for the ping EDMA reload parameters  */
EDMA_Handle hEdmaPong; /* Handle for the pong EDMA reload parameters  */
EDMA_Config cfgEdma;   /* EDMA configuration structure                */

/* Create the EDMA configuration structure for ping transfers */
EDMA_Config cfgEdmaPing = {  
  EDMA_OPT_RMK(          /* Making Options parameter register - EDMA_OPT    */ 
  
   EDMA_OPT_PRI_LOW,    /* Priority levels for EDMA events:-
                             EDMA_OPT_PRI_LOW  - Low priority EDMA transfer
                             EDMA_OPT_PRI_HIGH - High priority EDMA transfer*/
   
   EDMA_OPT_ESIZE_32BIT,/* Element size :-
                             EDMA_OPT_ESIZE_32BIT - 32 bit word 
                             EDMA_OPT_ESIZE_16BIT - 16 bit word 
                             EDMA_OPT_ESIZE_8BIT  -  8 bit word              */
   
   EDMA_OPT_2DS_NO,     /* Source dimension :-
                             EDMA_OPT_2DS_NO  - 1-dimensional source    
                             EDMA_OPT_2DS_YES - 2-dimensional source         */  
   
   EDMA_OPT_SUM_NONE,   /* Source address update mode :-           
                             EDMA_OPT_SUM_NONE - Fixed address mode 
                             EDMA_OPT_SUM_INC  - Increment address mode
                             EDMA_OPT_SUM_DEC  - Decrement address mode
                             EDMA_OPT_SUM_IDX  - Address modified by element 
                                                 index or frame Index        */
    EDMA_OPT_2DD_NO,     /* Destination dimension :-  
                             EDMA_OPT_2DD_NO   - 1-dimensional source            
                             EDMA_OPT_2DD_YES  - 2-dimensional source        */
   
    EDMA_OPT_DUM_INC,    /* Destination address update mode :-                       
                             EDMA_OPT_DUM_NONE - Fixed address mode            
                             EDMA_OPT_DUM_INC  - Increment address mode        
                             EDMA_OPT_DUM_DEC  - Decrement address mode        
                             EDMA_OPT_DUM_IDX  - Address modified by element   
                                                 index or frame Index        */
    
    EDMA_OPT_TCINT_YES,  /* Transfer complete interrupt :-
                             EDMA_OPT_TCINT_NO  - Indication disabled      
                             EDMA_OPT_TCINT_YES - Indication enabled         */  
    
    EDMA_OPT_TCC_OF(TCCINTNUM),/* Transfer complete code                     */
    
    EDMA_OPT_LINK_YES,   /* Linking of event parameters
                             EDMA_OPT_LINK_NO   -  Disabled 
                             EDMA_OPT_LINK_YES  -  Enabled                   */    
    
    EDMA_OPT_FS_NO       /* Frame synchronization
                             EDMA_OPT_FS_NO  - Channel is element/array 
                                                synchronized 
                             EDMA_OPT_FS_YES -  Channel is frame synchronized*/
  ),
  EDMA_SRC_OF(&ping_data),/* Source address register 
                               &ping_data    - source address                */
  
  EDMA_CNT_OF(BUFF_SZ),   /* Transfer count parameter
                                BUFF_SZ      - buffer sizes in # of ints     */      
  
  EDMA_DST_OF(ping),      /* Destination address parameter
                                 ping - destination address                  */ 
  
  EDMA_IDX_OF(0x00000004),/* Index parameter                                 */
  
  EDMA_RLD_OF(0x00000000) /* Count reload/link parameter                     */
};                         




/* Create the EDMA configuration structure for pong transfers */
EDMA_Config cfgEdmaPong = {
  EDMA_OPT_RMK(       /* Making Options parameter register - EDMA_OPT        */ 

    EDMA_OPT_PRI_LOW, /* Priority levels for EDMA events:-
                             EDMA_OPT_PRI_LOW  - Low priority EDMA transfer
                             EDMA_OPT_PRI_HIGH - High priority EDMA transfer */
                             
    EDMA_OPT_ESIZE_32BIT,/* Element size :-
                             EDMA_OPT_ESIZE_32BIT - 32 bit word 
                             EDMA_OPT_ESIZE_16BIT - 16 bit word 
                             EDMA_OPT_ESIZE_8BIT  -  8 bit word              */
    
    EDMA_OPT_2DS_NO,     /* Source dimension :-
                             EDMA_OPT_2DS_NO  - 1-dimensional source    
                             EDMA_OPT_2DS_YES - 2-dimensional source         */  

    EDMA_OPT_SUM_NONE,  /* Source address update mode :-           
                             EDMA_OPT_SUM_NONE - Fixed address mode 
                             EDMA_OPT_SUM_INC  - Increment address mode
                             EDMA_OPT_SUM_DEC  - Decrement address mode
                             EDMA_OPT_SUM_IDX  - Address modified by element 
                                                 index or frame Index        */ 
    EDMA_OPT_2DD_NO,    /* Destination dimension :-  
                             EDMA_OPT_2DD_NO   - 1-dimensional source            
                             EDMA_OPT_2DD_YES  - 2-dimensional source        */
    
    EDMA_OPT_DUM_INC,   /* Destination address update mode :-                       
                             EDMA_OPT_DUM_NONE - Fixed address mode            
                             EDMA_OPT_DUM_INC  - Increment address mode        
                             EDMA_OPT_DUM_DEC  - Decrement address mode        
                             EDMA_OPT_DUM_IDX  - Address modified by element   
                                                 index or frame Index        */
    EDMA_OPT_TCINT_YES, /* Transfer complete interrupt :-
                             EDMA_OPT_TCINT_NO  - Indication disabled      
                             EDMA_OPT_TCINT_YES - Indication enabled         */  

    EDMA_OPT_TCC_OF(TCCINTNUM),/* Transfer complete code                     */
    
    EDMA_OPT_LINK_YES,  /* Linking of event parameters
                             EDMA_OPT_LINK_NO   -  Disabled 
                             EDMA_OPT_LINK_YES  -  Enabled                   */    
    
    EDMA_OPT_FS_NO      /* Frame synchronization
                             EDMA_OPT_FS_NO  - Channel is element/array 
                                                synchronized 
                             EDMA_OPT_FS_YES -  Channel is frame synchronized*/  
  ),
  EDMA_SRC_OF(&pong_data),/* Source address register 
                               &ping_data    - source address                */
  
  EDMA_CNT_OF(BUFF_SZ),   /* Transfer count parameter
                                BUFF_SZ      - buffer sizes in # of ints     */      
  
  EDMA_DST_OF(pong),      /* Destination address parameter
                                 ping - destination address                  */ 
  
  EDMA_IDX_OF(0x00000004),/* Index parameter                                 */
  
  EDMA_RLD_OF(0x00000000) /* Count reload/link parameter                     */
};                         
 
    
/*----------------------------------------------------------------------------*/
void main(){
  
  /*Set the CCFG register of Cache to default value*/
  *(int *)0x01840000 = (*(int *)0x01840000 & 0x00000000);
  
  /* initialize the CSL library */
  CSL_init();

  /* Initialize DEC6713 board */
  DEC6713_init();
  /* initialize the input source data */
  ping_data=0x00000000;
  pong_data=0x80000000;
  
  /* Since these variables are the source of an EDMA transfer, we     */
  /* need to flush them out of the cache since we just wrote to them. */
  CACHE_wbInvL2(&ping_data, 4, CACHE_WAIT);
  CACHE_wbInvL2(&pong_data, 4, CACHE_WAIT);