fix zuart dma receiver bug

components/hardware/uart/zuart_dma_receiver.cpp

@@ -26,7 +26,7 @@ void ZUARTDmaReceiver::startRx(callback_t cb) {
 }
 
 int32_t ZUARTDmaReceiver::gertRxBufSize() { return m_rxbufsize; }
-void ZUARTDmaReceiver::periodJOBIrq() {  //
+void    ZUARTDmaReceiver::periodJOBIrq() {  //
 
   if (!m_dmaisstart) return;
 
@@ -36,11 +36,19 @@ void ZUARTDmaReceiver::periodJOBIrq() {  //
     m_lastrxticket = zos_get_tick();
   }
 
-  if (zos_haspassedms(m_lastrxticket) > m_hw_config.rxovertime_ms) {
-    if (m_cb) m_cb(m_rxbuf, m_rxlen);
-
-    m_rxlen = 0;
-    HAL_UART_DMAStop(m_hw_config.huart);
-    HAL_UART_Receive_DMA(m_hw_config.huart, (uint8_t *)m_rxbuf, m_rxbufsize);
+  if (m_rxlen != 0) {
+    if (zos_haspassedms(m_lastrxticket) > m_hw_config.rxovertime_ms) {
+      if (m_cb) m_cb(m_rxbuf, m_rxlen);
+
+      m_rxlen = 0;
+      HAL_UART_DMAStop(m_hw_config.huart);
+      HAL_UART_Receive_DMA(m_hw_config.huart, (uint8_t *)m_rxbuf, m_rxbufsize);
+    }
+  } else {
+    // 如果DMA接收停止了，重新启动
+    if (!(HAL_UART_GetState(m_hw_config.huart) & 0x1)) {
+      HAL_UART_DMAStop(m_hw_config.huart);
+      HAL_UART_Receive_DMA(m_hw_config.huart, (uint8_t *)m_rxbuf, m_rxbufsize);
+    }
   }
 }