65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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* spidma.c
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*
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* Created on: 27.07.2013
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* Author: mfro
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*/
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#include "spidma.h"
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#include <MCD_dma.h>
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#include "mcd_initiators.h"
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#include "bas_printf.h"
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extern char _SYS_SRAM[];
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#define SYS_SRAM &_SYS_SRAM[0]
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void *dma_memcpy(void *dst, void *src, size_t n)
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{
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int ret;
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int32_t start = MCF_SLT_SCNT(0);
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int32_t end;
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ret = MCD_startDma(0, src, 1, dst, 1, n, 1, DMA_ALWAYS, 0, MCD_SINGLE_DMA, 0);
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if (ret == MCD_OK)
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{
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xprintf("DMA on channel 0 successfully started\r\n");
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}
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do
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{
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ret = MCD_dmaStatus(0);
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xprintf(".");
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} while (ret != MCD_DONE);
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xprintf("\r\n");
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end = MCF_SLT_SCNT(0);
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xprintf("took %d seconds (1 Mbyte)\r\n", (end - start) / 132 / 1000);
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#ifdef _NOT_USED_
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__asm__ __volatile__("move.w sr,d0\n\t"
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"stop #0x270\n\t"
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"move.w d0,sr": : :); /* halt CPU until DMA finished */
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#endif /* _NOT_USED_ */
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return dst;
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}
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int spidma_init(void)
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{
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int res;
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res = MCD_initDma((dmaRegs *) &MCF_DMA_TASKBAR, SYS_SRAM, MCD_RELOC_TASKS | MCD_COMM_PREFETCH_EN);
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if (res != MCD_OK)
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{
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xprintf("DMA API initialization failed (0x%x)\r\n", res);
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return 0;
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}
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xprintf("DMA API initialized. Tasks are at %p\r\n", SYS_SRAM);
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// test
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dma_memcpy((void *) 0x40000000, (void *) 0x30000000, 0x100000);
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xprintf("DMA finished\r\n");
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return 1;
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}
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