From 125cbc814bc032ba217e8c10e0ceb43981126ce3 Mon Sep 17 00:00:00 2001
From: AJM <poslathian@poslathian.(none)>
Date: Mon, 13 Dec 2010 23:46:36 -0500
Subject: enlarged rx buffer and nak when less than 64 bytes is left in packet
 buf

---
 libmaple/usb/usb.c           |  4 ++--
 libmaple/usb/usb.h           |  4 ++--
 libmaple/usb/usb_callbacks.c | 23 ++++++++++++-----------
 libmaple/usb/usb_callbacks.h | 10 +++++-----
 libmaple/usb/usb_config.h    |  1 +
 5 files changed, 22 insertions(+), 20 deletions(-)

(limited to 'libmaple/usb')

diff --git a/libmaple/usb/usb.c b/libmaple/usb/usb.c
index 2b99132..396579f 100644
--- a/libmaple/usb/usb.c
+++ b/libmaple/usb/usb.c
@@ -336,7 +336,7 @@ void usbWaitReset(void) {
  *
  * 
  */
-uint32 usbSendBytes(uint8* sendBuf, uint16 len) {
+uint32 usbSendBytes(uint8* sendBuf, uint32 len) {
 
   uint16 loaded = 0;
 
@@ -380,7 +380,7 @@ uint32 usbBytesAvailable(void) {
    usb packet buffer) into recvBuf and deq's the fifo.
    will only copy the minimum of len or the available
    bytes. returns the number of bytes copied */
-uint32 usbReceiveBytes(uint8* recvBuf, uint8 len) {
+uint32 usbReceiveBytes(uint8* recvBuf, uint32 len) {
   if (len > VCOM_RX_EPSIZE - maxNewBytes) {
     len = VCOM_RX_EPSIZE - maxNewBytes;
   }
diff --git a/libmaple/usb/usb.h b/libmaple/usb/usb.h
index 84390cb..5bc31e1 100644
--- a/libmaple/usb/usb.h
+++ b/libmaple/usb/usb.h
@@ -73,9 +73,9 @@ void usb_lpIRQHandler(void);
 void usbWaitReset(void);
 
 /* blocking functions for send/receive */
-uint32 usbSendBytes(uint8* sendBuf,uint16 len);
+uint32 usbSendBytes(uint8* sendBuf,uint32 len);
 uint32 usbBytesAvailable(void);
-uint32 usbReceiveBytes(uint8* recvBuf, uint8 len);
+uint32 usbReceiveBytes(uint8* recvBuf, uint32 len);
 uint8 usbGetDTR(void);
 uint8 usbGetRTS(void);
 uint8 usbIsConnected(void);
diff --git a/libmaple/usb/usb_callbacks.c b/libmaple/usb/usb_callbacks.c
index c30d650..d04f610 100644
--- a/libmaple/usb/usb_callbacks.c
+++ b/libmaple/usb/usb_callbacks.c
@@ -32,11 +32,11 @@ USB_Line_Coding line_coding = {
  datatype:    0x08
 };
 
-uint8 vcomBufferRx[VCOM_RX_EPSIZE];
-volatile uint8 countTx    = 0;
-volatile uint8 recvBufIn  = 0;
-volatile uint8 recvBufOut = 0;
-volatile uint8 maxNewBytes   = VCOM_RX_EPSIZE;
+uint8 vcomBufferRx[VCOM_RX_BUFLEN];
+volatile uint32 countTx    = 0;
+volatile uint32 recvBufIn  = 0;
+volatile uint32 recvBufOut = 0;
+volatile uint32 maxNewBytes   = VCOM_RX_BUFLEN;
 
 RESET_STATE reset_state = DTR_UNSET;
 uint8       line_dtr_rts = 0;
@@ -61,6 +61,7 @@ void vcomDataRxCb(void) {
   /* setEPRxCount on the previous cycle should garuntee
      we havnt received more bytes than we can fit */
   uint8 newBytes = GetEPRxCount(VCOM_RX_ENDP);
+  SetEPRxStatus(VCOM_RX_ENDP,EP_RX_NAK);
   /* assert (newBytes <= maxNewBytes); */
 
   /* todo, not checking very carefully for edge cases. USUALLY,
@@ -116,26 +117,26 @@ void vcomDataRxCb(void) {
 
 
 
-  if (recvBufIn + newBytes < VCOM_RX_EPSIZE) {
+  if (recvBufIn + newBytes < VCOM_RX_BUFLEN) {
     PMAToUserBufferCopy(&vcomBufferRx[recvBufIn],VCOM_RX_ADDR,newBytes);
     recvBufIn += newBytes;
   } else {
     /* we have to copy the data in two chunks because we roll over
        the edge of the circular buffer */
-    uint8 tailBytes = VCOM_RX_EPSIZE - recvBufIn;
+    uint8 tailBytes = VCOM_RX_BUFLEN - recvBufIn;
     uint8 remaining = newBytes - tailBytes;
 
     PMAToUserBufferCopy(&vcomBufferRx[recvBufIn],VCOM_RX_ADDR,tailBytes);
     PMAToUserBufferCopy(&vcomBufferRx[0],        VCOM_RX_ADDR,remaining);
 
-    recvBufIn = (recvBufIn + newBytes ) % VCOM_RX_EPSIZE;
+    recvBufIn = (recvBufIn + newBytes ) % VCOM_RX_BUFLEN;
   }
   
   maxNewBytes    -= newBytes;
 
-  if (maxNewBytes > VCOM_RX_EPSIZE) {
-      SetEPRxCount(VCOM_RX_ENDP,0);
-      SetEPRxStatus(VCOM_RX_ENDP,EP_RX_NAK); /* nak until we clear the buffer */
+  if (maxNewBytes >= VCOM_RX_EPSIZE) {
+      SetEPRxCount(VCOM_RX_ENDP,VCOM_RX_EPSIZE);
+      SetEPRxStatus(VCOM_RX_ENDP,EP_RX_VALID); 
   }
 
 }
diff --git a/libmaple/usb/usb_callbacks.h b/libmaple/usb/usb_callbacks.h
index a94de11..21ceb77 100644
--- a/libmaple/usb/usb_callbacks.h
+++ b/libmaple/usb/usb_callbacks.h
@@ -34,11 +34,11 @@ typedef enum {
 
 extern RESET_STATE reset_state;  /* tracks DTR/RTS */
 extern uint8       line_dtr_rts;  
-extern volatile uint8 countTx;
-extern uint8 vcomBufferRx[VCOM_RX_EPSIZE];  /* no reason this has to be VCOM_RX_EPSIZE, could be bigger */
-extern volatile uint8 recvBufIn;   /* the FIFO in index to the recvbuffer */
-extern volatile uint8 recvBufOut;  /* the FIFO out index to the recvbuffer */
-extern volatile uint8 maxNewBytes;
+extern volatile uint32 countTx;
+extern uint8 vcomBufferRx[VCOM_RX_BUFLEN];  /* no reason this has to be VCOM_RX_EPSIZE, could be bigger */
+extern volatile uint32 recvBufIn;   /* the FIFO in index to the recvbuffer */
+extern volatile uint32 recvBufOut;  /* the FIFO out index to the recvbuffer */
+extern volatile uint32 maxNewBytes;
 
 void vcomDataTxCb(void);
 void vcomDataRxCb(void);
diff --git a/libmaple/usb/usb_config.h b/libmaple/usb/usb_config.h
index ba05d42..e5f3979 100644
--- a/libmaple/usb/usb_config.h
+++ b/libmaple/usb/usb_config.h
@@ -26,6 +26,7 @@
 #define VCOM_RX_EPNUM             0x03
 #define VCOM_RX_ADDR              0x110
 #define VCOM_RX_EPSIZE            0x40
+#define VCOM_RX_BUFLEN            (VCOM_RX_EPSIZE*3)
 
 #define bMaxPacketSize            0x40  /* 64B, maximum for USB FS Devices */
 
-- 
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