在Zigbee的DMA串口发送函数 static uint16 HalUARTWriteDMA(uint8 *buf, uint16 len)中有如下一段代码
/* If an ongoing DMA Tx finished while this buffer was being *appended*, then another DMA Tx
* will have already been started on this buffer, but it did not include the bytes just appended.
* Therefore these bytes have to be re-copied to the start of the new working buffer.
*/
HAL_ENTER_CRITICAL_SECTION(his);
if (txSel != dmaCfg.txSel)
{
HAL_EXIT_CRITICAL_SECTION(his);
txSel = dmaCfg.txSel;
txIdx = dmaCfg.txIdx[txSel];
for (cnt = 0; cnt < len; cnt++)
{
dmaCfg.txBuf[txSel][txIdx++] = buf[cnt];
}
HAL_ENTER_CRITICAL_SECTION(his);
}
dmaCfg.txIdx[txSel] = txIdx;
注释说了一堆东西，但感觉这段代码几乎不会用到吧？ dmaCfg.txSel在中断中并没有被改变啊，只是在
HalUARTPollDMA中会取成另一个通道，请问Ti的工程师 我可以去掉这段代码吗？
