From 669b8e72395b26ce28e87d4503eda50cc61c5e4f Mon Sep 17 00:00:00 2001
From: blckmn <blackman@xtra.com.au>
Date: Sat, 16 Jul 2016 21:09:32 +1000
Subject: [PATCH] Small fix for VCP port buffer send incomplete

---
 src/main/drivers/serial_usb_vcp.c |  7 +++----
 src/main/vcpf4/usbd_cdc_vcp.c     | 13 ++++++-------
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/main/drivers/serial_usb_vcp.c b/src/main/drivers/serial_usb_vcp.c
index f225dd62bb..61b3979967 100644
--- a/src/main/drivers/serial_usb_vcp.c
+++ b/src/main/drivers/serial_usb_vcp.c
@@ -90,7 +90,6 @@ static void usbVcpWriteBuf(serialPort_t *instance, void *data, int count)
 {
     UNUSED(instance);
 
-
     if (!(usbIsConnected() && usbIsConfigured())) {
         return;
     }
@@ -120,12 +119,12 @@ static bool usbVcpFlush(vcpPort_t *port)
         return false;
     }
 
-    uint32_t txed;
+    uint8_t txed = 0;
     uint32_t start = millis();
 
     do {
-        txed = CDC_Send_DATA(port->txBuf, count);
-    } while (txed != count && (millis() - start < USB_TIMEOUT));
+        txed += CDC_Send_DATA(&port->txBuf[txed], count-txed);
+    } while (txed < count && (millis() - start < USB_TIMEOUT));
 
     return txed == count;
 }
diff --git a/src/main/vcpf4/usbd_cdc_vcp.c b/src/main/vcpf4/usbd_cdc_vcp.c
index f312e4a34c..879b2edc66 100644
--- a/src/main/vcpf4/usbd_cdc_vcp.c
+++ b/src/main/vcpf4/usbd_cdc_vcp.c
@@ -166,7 +166,7 @@ uint32_t CDC_Send_DATA(uint8_t *ptrBuffer, uint8_t sendLength)
  *         this function.
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
- * @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
+ * @retval Result of the operation: USBD_OK if all operations are OK else VCP_FAIL
  */
 static uint16_t VCP_DataTx(uint8_t* Buf, uint32_t Len)
 {
@@ -191,18 +191,17 @@ uint8_t usbAvailable(void)
  *******************************************************************************/
 uint32_t CDC_Receive_DATA(uint8_t* recvBuf, uint32_t len)
 {
-    uint32_t ch = 0;
+    uint32_t count = 0;
 
-    while (usbAvailable() && ch < len) {
-        recvBuf[ch] = usbData.buffer[usbData.bufferOutPosition];
+    while (usbAvailable() && count < len) {
+        recvBuf[count] = usbData.buffer[usbData.bufferOutPosition];
         usbData.bufferOutPosition = (usbData.bufferOutPosition + 1) % USB_RX_BUFSIZE;
-        ch++;
+        count++;
         receiveLength--;
     }
-    return ch;
+    return count;
 }
 
-
 /**
  * @brief  VCP_DataRx
  *         Data received over USB OUT endpoint are sent over CDC interface