DMA 是否可以用于CAN 和 SCI 的收发？

如题，如果可以的话，是否可以有这方面的例子程序提供一下？

gaoyang9992006：

http://www.deyisupport.com/question_answer/microcontrollers/hercules/f/70/t/45136.aspx

http://www.deyisupport.com/question_answer/microcontrollers/hercules/f/70/t/62677.aspx

SCI

—————–

经测试能够在RM49L952上运行，仅供参考：

sciInit();load_data();/* – DMA Configuration */

/* Enable DMA */dmaEnable();

/* assigning dma request: channel-0 with request line – 1 – TX*//* DMA Request 29 is for LIN ( SCI2) Transmit *//* Refer Data sheet – Default DMA Request Map section */dmaReqAssign(DMA_CH0,29);

/* – configuring dma control packets */g_dmaCTRLPKT.SADD = (uint32)(&TX_DATA); /* source address */g_dmaCTRLPKT.DADD = (uint32)(&scilinREG->TD); /* destination address */g_dmaCTRLPKT.CHCTRL = 0; /* channel control */g_dmaCTRLPKT.FRCNT = D_SIZE; /* frame count */g_dmaCTRLPKT.ELCNT = 1; /* element count */g_dmaCTRLPKT.ELDOFFSET = 0; /* element destination offset – is required? */g_dmaCTRLPKT.ELSOFFSET = 0; /* element source offset – is required? */g_dmaCTRLPKT.FRDOFFSET = 0; /* frame detination offset – is required? */g_dmaCTRLPKT.FRSOFFSET = 0; /* frame source offset – is required? */g_dmaCTRLPKT.PORTASGN = 4; /* port b */g_dmaCTRLPKT.RDSIZE = ACCESS_8_BIT; /* read size */g_dmaCTRLPKT.WRSIZE = ACCESS_8_BIT; /* write size */g_dmaCTRLPKT.TTYPE = FRAME_TRANSFER ; /* transfer type */g_dmaCTRLPKT.ADDMODERD = ADDR_INC1; /* address mode read */g_dmaCTRLPKT.ADDMODEWR = ADDR_FIXED; /* address mode write */g_dmaCTRLPKT.AUTOINIT = AUTOINIT_OFF; /* autoinit (loop) */dmaSetCtrlPacket(DMA_CH0,g_dmaCTRLPKT);/* – setting dma control packets for transmit */dmaSetCtrlPacket(DMA_CH0,g_dmaCTRLPKT);

/* – setting the dma channel to trigger on h/w request */dmaSetChEnable(DMA_CH0, DMA_HW);

/* Enable TX DMA */scilinREG->SETINT = (1 << 16);