[X9D] SD card write error fixed, DMA enabled (thanks Adela), SPORT debug code

src/x9d/sport_driver.cpp

@@ -36,6 +36,8 @@
 
 #include "../open9x.h"
 
+uint16_t tmp=0; // Debug - received bytes counter
+
 void sportInit(void)
 {
   USART_InitTypeDef USART_InitStructure;
@@ -89,10 +91,20 @@ void sportPutc(const char c)
 extern "C" void USART2_IRQHandler()
 {
     uint16_t data;
-    
-    while(USART_GetFlagStatus(SPORT, USART_FLAG_RXNE)){
+	
+    tmp++;  // Debug - received bytes counter
+			
+    if(USART_GetFlagStatus(SPORT, USART_FLAG_RXNE))
       data = USART_ReceiveData(SPORT);
-      processSerialData((uint8_t) data);
+    
+    USART_ClearFlag(SPORT,USART_FLAG_RXNE); // Just in case, should be cleared automatically by the read above, and we shouldn't enter the interrupt if no char received - doesn't help
+      
+    if(SPORT->SR & USART_FLAG_ORE) // Debug - never happened once yet
+    {
+      data = (int8_t)(SPORT->SR & (uint8_t)0xFF);
+      tmp=0;
     }
+    
+    processSerialData((uint8_t) data);
 } 
 #endif