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请问，MCASP通过DMA发送，是不是不管发送几路都只用一个ＤＭＡ通道？
对，区别在于一个事件发送的数据为elementSize*ChannelCount，即ACNT在一个通道时为一个element，多通道时为几个element.
您好，Tony Tang
我使用了 C6748 和 8DA Audio CODECs，想根据官方mcasp例程，修改为2路AXRn输出。
关于McASP和DMA我进行如下操作，但不成功。修改前一路AXR有输出，修改后都没输出。您看有什么问题。
static struct EDMA3CCPaRAMEntry const txDefaultPar = { (unsigned int)(EDMA3CC_OPT_DAM | (0x02 << 8u)), /* Opt field */ (unsigned int)loopBuf, /* source address */ (unsigned short)(BYTES_PER_SAMPLE), /* aCnt */ // 这里修改为 aCnt * 2 (unsigned short)(NUM_SAMPLES_LOOP_BUF), /* bCnt */ (unsigned int) SOC_MCASP_0_DATA_REGS, /* dest address */ (short) (BYTES_PER_SAMPLE), /* source bIdx */ (short)(0), /* dest bIdx */ (unsigned short)(PAR_TX_START * SIZE_PARAMSET), /* link address */ (unsigned short)(0), /* bCnt reload value */ (short)(0), /* source cIdx */ (short)(0), /* dest cIdx */ (unsigned short)1 /* cCnt */ };
static void McASPI2SConfigure(void){
...
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, 12);
McASPPinDirOutputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AXR(MCASP_XSER_TX) | MCASP_PIN_AXR(12));
}
发送数组大小修改 *2
