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modified to be able to replace memcpy()

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This commit is contained in:
Markus Fröschle
2013-11-05 20:23:41 +00:00
parent a092461d20
commit cc5846c483
1 changed files with 1 additions and 70 deletions
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71
sources/dma.c
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@@ -50,36 +50,6 @@ void *dma_memcpy(void *dst, void *src, size_t n)
volatile int32_t time; volatile int32_t time;
volatile int32_t start; volatile int32_t start;
volatile int32_t end; volatile int32_t end;
uint8_t *d;
uint8_t *s;
xprintf("compare memcpy() to memory to memory DMA from %p to %p (0x%x bytes ending at 0x%x)\r\n",
src, dst, n, dst + n);
d = dst;
s = src;
start = MCF_SLT0_SCNT;
/* first check if we can do a "traditional" memcpy() to the destination and measure speed */
memcpy(d, s, n);
end = MCF_SLT0_SCNT;
time = (start - end) / (SYSCLK / 1000) / 1000;
xprintf("memcpy() took %d ms (%f Mbytes/second)\r\n",
time, n / (float) time / 1000.0);
flush_and_invalidate_caches();
xprintf("clear target area after memcpy():");
start = MCF_SLT0_SCNT;
bzero(dst, n);
end = MCF_SLT0_SCNT;
time = (start - end) / (SYSCLK / 1000);
xprintf("bzero() took %d ms (%f Mbytes/second)\r\n", time, n / (float) time / 1000.0);
xprintf(" finished, flush caches: ");
flush_and_invalidate_caches();
xprintf("finished\r\n");
start = MCF_SLT0_SCNT; start = MCF_SLT0_SCNT;
ret = MCD_startDma(1, src, 4, dst, 4, n, 4, DMA_ALWAYS, 0, MCD_SINGLE_DMA, 0); ret = MCD_startDma(1, src, 4, dst, 4, n, 4, DMA_ALWAYS, 0, MCD_SINGLE_DMA, 0);
@@ -127,47 +97,8 @@ void *dma_memcpy(void *dst, void *src, size_t n)
end = MCF_SLT0_SCNT; end = MCF_SLT0_SCNT;
time = (start - end) / (SYSCLK / 1000) / 1000; time = (start - end) / (SYSCLK / 1000) / 1000;
//xprintf("start = %d, end = %d, time = %d\r\n", start, end, time);
xprintf("took %d ms (%f Mbytes/second)\r\n", time, n / (float) time / 1000.0); xprintf("took %d ms (%f Mbytes/second)\r\n", time, n / (float) time / 1000.0);
/*
* verify if copy succeeded
*/
xprintf("verify if DMA copy succeeded:\r\n");
xprintf("flush caches first:");
flush_and_invalidate_caches();
xprintf(" done.\r\n");
s = src;
d = dst;
start = MCF_SLT0_SCNT;
do
{
if (*d != *s)
{
xprintf("copy verification failed: %d (%p) != %d (%p) !\r\n", *d, d, *s, s);
break;
}
d++; s++;
} while (d < (uint8_t *) dst + n);
if (d >= (uint8_t *) dst + n)
{
xprintf("DMA copy verification successful!\r\n");
end = MCF_SLT0_SCNT;
time = (start - end) / (SYSCLK / 1000) / 1000;
xprintf("took %d ms (%f Mbytes/second)\r\n", time, n / (float) time / 1000.0);
}
#ifdef _NOT_USED_
__asm__ __volatile__("move.w sr,d0\n\t"
"stop #0x2700\n\t"
"move.w d0,sr": : :); /* halt CPU until DMA finished */
#endif /* _NOT_USED_ */
return dst; return dst;
} }
@@ -188,7 +119,7 @@ int dma_init(void)
xprintf("DMA API version %d.%d initialized. Tasks are at %p\r\n", version / 0xff, version % 0xff, SYS_SRAM); xprintf("DMA API version %d.%d initialized. Tasks are at %p\r\n", version / 0xff, version % 0xff, SYS_SRAM);
// test // test
dma_memcpy((void *) 0x01000000, (void *) 0xe0000000, 0x00100000); /* copy one megabyte of flash to RAM */ dma_memcpy((void *) 0x10000, (void *) 0xe0000000, 0x00100000); /* copy one megabyte of flash to RAM */
xprintf("DMA finished\r\n"); xprintf("DMA finished\r\n");
return 0; return 0;