Firebee/BaS_gcc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

MCD DMA memcpy() test. Takes ages.

Browse Source
This commit is contained in:
Markus Fröschle
2013-07-30 20:31:41 +00:00
parent bf0945b5ff
commit f86cf45cbf
2 changed files with 24 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
sources/spidma.c
View File

@@ -16,11 +16,30 @@ extern char _SYS_SRAM[];
void *dma_memcpy(void *dst, void *src, size_t n)
{
int ret;
int32_t start = MCF_SLT_SCNT(0);
int32_t end;
ret = MCD_startDma(0, src, 1, dst, 1, n, 1, DMA_ALWAYS, 0, MCD_SINGLE_DMA, 0);
if (ret == MCD_OK)
{
xprintf("DMA on channel 0 successfully started\r\n");
}
do
{
ret = MCD_dmaStatus(0);
xprintf(".");
} while (ret != MCD_DONE);
xprintf("\r\n");
end = MCF_SLT_SCNT(0);
xprintf("took %d seconds (1 Mbyte)\r\n", (end - start) / 132 / 1000);
#ifdef _NOT_USED_
__asm__ __volatile__("move.w sr,d0\n\t"
"stop #0x270\n\t"
"move.w d0,sr": : :); /* halt CPU until DMA finished */
#endif /* _NOT_USED_ */
return dst;
}
@@ -36,6 +55,10 @@ int spidma_init(void)
return 0;
}
xprintf("DMA API initialized. Tasks are at %p\r\n", SYS_SRAM);
// test
dma_memcpy((void *) 0x40000000, (void *) 0x30000000, 0x100000);
xprintf("DMA finished\r\n");
return 1;
}