diff --git a/Src/SerialPortFlagchip.c b/Src/SerialPortFlagchip.c
index 89d2d06..003525e 100644
--- a/Src/SerialPortFlagchip.c
+++ b/Src/SerialPortFlagchip.c
@@ -103,6 +103,9 @@ void vSerialPortInitDMA(
 
     DMA_StartChannel(DMA_INSTANCE_0, RX_DMA_CHANNEL);
 
+    NVIC_SetPriorityGrouping(NVIC_PRIORITY_GROUP_4);
+
+    NVIC_SetPriority(DMA_Error_IRQn, IRQ_DMA_PRIORITY);
     NVIC_SetPriority(IRQ_DMA, IRQ_DMA_PRIORITY);
     NVIC_EnableIRQ(IRQ_DMA);