simplify VCOM code

CH32V203/src/USBUsr/usb_istr.c

@@ -214,15 +214,12 @@ void EP2_IN_Callback(void)
 
 void EP3_IN_Callback(void)
 {
-    Vcom.in_ready = 1;
 }
 
 
 void EP3_OUT_Callback(void)
 {
     Vcom.out_bytes = USB_SIL_Read(EP3_OUT, (uint8_t *)Vcom.out_buff);
-
-    Vcom.out_ready = 1;
 }
 
 

CH32V203/src/USBUsr/usb_prop.c

@@ -259,8 +259,6 @@ void USBD_Reset(void)
     SetDeviceAddress(0);
 
     bDeviceState = ATTACHED;
-
-    Vcom.in_ready = 1;
 }
 
 /*********************************************************************

CH32V203/src/vcom_serial.c

@@ -127,7 +127,7 @@ void VCOM_TransferData(void)
     static uint32_t last_ms = 0;
     static uint32_t last_pos = 0;
 
-    if(Vcom.in_ready)		// 可以向主机发送数据
+    if(GetEPTxStatus(ENDP3) == EP_TX_NAK)   // 可以向主机发送数据
     {
         uint32_t pos = RXDMA_SZ - DMA_GetCurrDataCounter(DMA1_Channel6);
         if((pos - last_pos >= CDC_BULK_IN_SZ) || ((pos != last_pos) && (SysTick_ms != last_ms)))
@@ -140,8 +140,6 @@ void VCOM_TransferData(void)
 
             Vcom.in_bytes = pos - last_pos;
 
-            Vcom.in_ready = 0;
-
             USB_SIL_Write(EP3_IN, &RXBuffer[last_pos], Vcom.in_bytes);
             SetEPTxValid(ENDP3);
 
@@ -164,16 +162,16 @@ void VCOM_TransferData(void)
     }
 
 	/* 从主机接收到数据，且前面的数据 DMA 已发送完 */
-    if(Vcom.out_ready && (DMA_GetCurrDataCounter(DMA1_Channel7) == 0))
+    if(Vcom.out_bytes && (DMA_GetCurrDataCounter(DMA1_Channel7) == 0))
     {
-        Vcom.out_ready = 0;
-
         memcpy(TXBuffer, (uint8_t *)Vcom.out_buff, Vcom.out_bytes);
 
         DMA_Cmd(DMA1_Channel7, DISABLE);
         DMA_SetCurrDataCounter(DMA1_Channel7, Vcom.out_bytes);
         DMA_Cmd(DMA1_Channel7, ENABLE);
 
+        Vcom.out_bytes = 0;
+
         /* Ready for next BULK OUT */
 		SetEPRxValid(ENDP3);
     }

CH32V203/src/vcom_serial.h

@@ -17,10 +17,8 @@ typedef struct {
 	
 	uint8_t  in_buff[64];
 	uint16_t in_bytes;
-	uint16_t in_ready;
 	uint8_t  out_buff[64];
 	uint16_t out_bytes;
-	uint16_t out_ready;
 } VCOM;
 
 extern volatile VCOM Vcom;