Removed references to GPIO.

Added some serial error interrupts checkings.

l0/usart/src/usart1.c

 #include "usart1.h"
-#include "gpio.h"
 
 #define     USART                    USART1
 #define     USART_ENABLE_CLK         __USART1_CLK_ENABLE()
@@ -36,6 +35,7 @@ TComm *usart1_comm_dev;
 void USART_IRQHandler(void)
 {
   unsigned char data,ret;
+  uint32_t source;
 
   if(__HAL_UART_GET_IT(&UartHandle, UART_IT_RXNE) != RESET)
   {
@@ -66,31 +66,28 @@ void USART_IRQHandler(void)
     if(__HAL_UART_GET_IT_SOURCE(&UartHandle, UART_IT_PE) != RESET)
     {
       __HAL_UART_CLEAR_IT(&UartHandle, UART_CLEAR_PEF);
-      gpio_set_led(LED_CHG);
     }
   }
+  source=__HAL_UART_GET_IT_SOURCE(&UartHandle, UART_IT_ERR);
   if(__HAL_UART_GET_IT(&UartHandle, UART_IT_FE) != RESET)/* framing error */
   {
-    if(__HAL_UART_GET_IT_SOURCE(&UartHandle, UART_IT_ERR) != RESET)
+    if(source != RESET)
     {
       __HAL_UART_CLEAR_IT(&UartHandle, UART_CLEAR_FEF);
-      gpio_set_led(LED_CHG);
     }
   }
   if(__HAL_UART_GET_IT(&UartHandle, UART_IT_NE) != RESET)/* noise error */
   {
-    if(__HAL_UART_GET_IT_SOURCE(&UartHandle, UART_IT_ERR) != RESET)
+    if(source != RESET)
     {
       __HAL_UART_CLEAR_IT(&UartHandle, UART_CLEAR_NEF);
-      gpio_set_led(LED_CHG);
     }
   }
   if(__HAL_UART_GET_IT(&UartHandle, UART_IT_ORE) != RESET)/* overrun error */
   {
-    if(__HAL_UART_GET_IT_SOURCE(&UartHandle, UART_IT_ERR) != RESET)
+    if(source != RESET)
     {
       __HAL_UART_CLEAR_IT(&UartHandle, UART_CLEAR_OREF);
-      gpio_set_led(LED_CHG);
     }
   }
 }
@@ -105,7 +102,6 @@ void USART_DMA_IRQHandler(void)
       __HAL_DMA_DISABLE_IT(UartHandle.hdmatx, DMA_IT_TE);
       /* Clear the transfer error flag */
       __HAL_DMA_CLEAR_FLAG(UartHandle.hdmatx, __HAL_DMA_GET_TE_FLAG_INDEX(UartHandle.hdmatx));
-      gpio_set_led(LED_DCHG);
     }
   }
   if(__HAL_DMA_GET_FLAG(UartHandle.hdmatx,__HAL_DMA_GET_TC_FLAG_INDEX(UartHandle.hdmatx)) != RESET)
@@ -140,7 +136,6 @@ void USART_DMA_IRQHandler(void)
       __HAL_DMA_DISABLE_IT(UartHandle.hdmarx, DMA_IT_TE);
       /* Clear the transfer error flag */
       __HAL_DMA_CLEAR_FLAG(UartHandle.hdmarx, __HAL_DMA_GET_TE_FLAG_INDEX(UartHandle.hdmarx));
-      gpio_set_led(LED_DCHG);
     }
   }
   if(__HAL_DMA_GET_FLAG(UartHandle.hdmarx,__HAL_DMA_GET_TC_FLAG_INDEX(UartHandle.hdmarx)) != RESET)