用pxa270片选5接cpld,从cpld dma数据过来.dma过来的数据有些正常,有些不正常.请问跟哪方面有关?请高手指点一下啊.
DCSR(channel) = DCSR_NODESC;
DSADR(channel) = 0x14000000;//+0x1000000; //外设源地址
DTADR(channel) = dmaaddr; //内存地址
DCMD(channel) = DCMD_INCTRGADDR | DCMD_FLOWSRC | DCMD_ENDIRQEN | DCMD_WIDTH2 |DCMD_BURST8 |MAX_LINE_BYTE;
DCSR(channel) &= ~DCSR_STOPIRQEN;
//启动
DCSR(channel) |= DCSR_RUN; |
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