Hi all
I use DM8168 EVM. CCSV5.4 . the attachment is the gel file and my edma configuration code.
I use TSCL/TSCH registers to count the time consuming.
I use two different ways to count cycle, and the time consuming of each way have big different.
first way:
I add two breakpionts, one just before function edma_2d2d, one just after function edma_2d2d, the code is as:
statement; // breakpoint 1 get the value of TSCH/TSCK
edma_2d2d(); // step over
statement ; // breakpoint2 get the value of TSCH/TSCK
the cycle used in this way is about 1300-2000 cycles
sencode way:
statement; // breakpoint 1 get the value of TSCH/TSCK
edma_2d2d(); // step info inside the function ,and single-step every statements of this function,
statement ; // breakpoint2 get the value of TSCH/TSCK
the cycle used in this way is about 120-200 cycles
Why the first way consume so much cycles?
/*
* dma_test.c
*
* Created on: 2015-3-4
* Author: Administrator
*/
#include "dma_test.h"
int edma_init()
{
int chnId = 0;
// clear some registers
REG(EDMATPCC+EDMAECR) = 0xffffffff; // clear ER
REG(EDMATPCC+EDMAECRH) = 0xffffffff;
REG(EDMATPCC+EDMAIECR) = 0xffffffff; // clear IER
REG(EDMATPCC+EDMAIECRH) = 0xffffffff;
REG(EDMATPCC+EDMAICR) = 0xffffffff; // clear IPR
REG(EDMATPCC+EDMAICRH) = 0xffffffff;
// set DCHMAP for edma channel
chnId = 0;
REG(EDMATPCC+EDMADCHMAP0+chnId * 4) = 0; // edma channel 0 use paramset 0
chnId = 1;
REG(EDMATPCC+EDMADCHMAP0+chnId * 4) = 1 << 5; // edma channel 1 use paramset 1
REG(EDMATPCC+EDMAQNUM0) = 1 << 4; // channel 1 set to EQ1 and channel 0 set to EQ0
REG(EDMATPCC+EDMAEESR) |= 3;
return 0;
}
int qdma_init()
{
return 0;
}
int edma_wait()
{
int cnt = 0;
while(REG(EDMATPCC+EDMAIPR) & 1 == 0)
cnt++ ;
REG(EDMATPCC+EDMAICR) |= 1;
return 1;
}
int edma_2d2d(unsigned int src, unsigned int abcnt, unsigned int dst,unsigned int dstsrcbidx,unsigned int bcntrld_link,unsigned int dstsrccidx,unsigned int ccnt)
{
paramset *set0 = (paramset *)(EDMATPCC+EDMAPARAM);
int cnt = 0;
set0->opt = 0x0010000c;
set0->src = src;
set0->bcnt_acnt = abcnt;
set0->dst = dst;
set0->dstb_srcb_idx = dstsrcbidx;
set0->bcntrld_link = bcntrld_link;
set0->dstc_srcc_idx = dstsrccidx;
set0->rsv_ccnt = ccnt;
REG(EDMATPCC+EDMAESR) |= 1;
return 0;
}
int qdma_2d2d()
{
return 0;
}
