fix return value for error.

[proxmark3-svn] / common / usb_cdc.c

diff --git a/common/usb_cdc.c b/common/usb_cdc.c
index 97551692e5a09b8951a769dfcd71637122753a71..7fd2933c322463f5d5790b9397d5c7aeb8d3b72a 100644 (file)
--- a/common/usb_cdc.c
+++ b/common/usb_cdc.c
@@ -81,7 +81,7 @@ const char cfgDescriptor[] = {
        0x01, // bNumEndpoints\r
        0x02, // bInterfaceClass\r
        0x02, // bInterfaceSubclass\r
        0x01, // bNumEndpoints\r
        0x02, // bInterfaceClass\r
        0x02, // bInterfaceSubclass\r

-       0x01, // bInterfaceProtocol\r
+       0x00, // bInterfaceProtocol\r

        0x00, // iInterface\r
 \r
        /* Header Functional Descriptor */\r
        0x00, // iInterface\r
 \r
        /* Header Functional Descriptor */\r


@@ -223,7 +223,6 @@ byte_t btReceiveBank   = AT91C_UDP_RX_DATA_BK0;
 void usb_disable() {\r
   // Disconnect the USB device\r
   AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;\r
 void usb_disable() {\r
   // Disconnect the USB device\r
   AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;\r

-//  SpinDelay(100);\r

   \r
   // Clear all lingering interrupts\r
   if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {\r
   \r
   // Clear all lingering interrupts\r
   if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {\r


@@ -257,7 +256,6 @@ void usb_enable() {
   \r
   // Wait for a short while\r
   for (volatile size_t i=0; i<0x100000; i++);\r
   \r
   // Wait for a short while\r
   for (volatile size_t i=0; i<0x100000; i++);\r

-//  SpinDelay(100);\r

 \r
   // Reconnect USB reconnect\r
   AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
 \r
   // Reconnect USB reconnect\r
   AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r


@@ -295,33 +293,47 @@ bool usb_poll()
   return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);\r
 }\r
 \r
   return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);\r
 }\r
 \r

+/**\r
+       In github PR #129, some users appears to get a false positive from\r
+       usb_poll, which returns true, but the usb_read operation\r
+       still returns 0.\r
+       This check is basically the same as above, but also checks\r
+       that the length available to read is non-zero, thus hopefully fixes the\r
+       bug.\r
+**/\r
+bool usb_poll_validate_length()\r
+{\r
+\r
+       if (!usb_check()) return false;\r
+       if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;\r
+       return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) >  0;\r
+}\r
+\r

 //*----------------------------------------------------------------------------\r
 //* \fn    usb_read\r
 //* \brief Read available data from Endpoint OUT\r
 //*----------------------------------------------------------------------------\r
 uint32_t usb_read(byte_t* data, size_t len) {\r
 //*----------------------------------------------------------------------------\r
 //* \fn    usb_read\r
 //* \brief Read available data from Endpoint OUT\r
 //*----------------------------------------------------------------------------\r
 uint32_t usb_read(byte_t* data, size_t len) {\r

-  byte_t bank = btReceiveBank;\r
+       byte_t bank = btReceiveBank;\r

        uint32_t packetSize, nbBytesRcv = 0;\r
        uint32_t packetSize, nbBytesRcv = 0;\r

-  uint32_t time_out = 0;\r
+       uint32_t time_out = 0;\r

   \r
   \r

-       while (len)\r
-  {\r
+       while (len)  {\r

                if (!usb_check()) break;\r
 \r
                if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {\r
                        packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);\r
                if (!usb_check()) break;\r
 \r
                if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {\r
                        packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);\r

-      len -= packetSize;\r
+                       len -= packetSize;\r

                        while(packetSize--)\r
                                data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];\r
                        pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);\r
                        while(packetSize--)\r
                                data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];\r
                        pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);\r

-                       if (bank == AT91C_UDP_RX_DATA_BK0)\r
-      {\r
+                       if (bank == AT91C_UDP_RX_DATA_BK0) {\r

                                bank = AT91C_UDP_RX_DATA_BK1;\r
                                bank = AT91C_UDP_RX_DATA_BK1;\r

-      } else {\r
+                       } else {\r

                                bank = AT91C_UDP_RX_DATA_BK0;\r
                                bank = AT91C_UDP_RX_DATA_BK0;\r

-      }\r
+                       }\r

                }\r
                }\r

-    if (time_out++ == 0x1fff) break;\r
+               if (time_out++ == 0x1fff) break;\r

        }\r
 \r
        btReceiveBank = bank;\r
        }\r
 \r
        btReceiveBank = bank;\r


@@ -350,7 +362,7 @@ uint32_t usb_write(const byte_t* data, const size_t len) {
                cpt = MIN(length, AT91C_EP_IN_SIZE-1);\r
                length -= cpt;\r
                while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r
                cpt = MIN(length, AT91C_EP_IN_SIZE-1);\r
                length -= cpt;\r
                while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r

-               // Wait for the the first bank to be sent\r
+               // Wait for the first bank to be sent\r

                while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
                        if (!usb_check()) return length;\r
     }\r
                while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
                        if (!usb_check()) return length;\r
     }\r


@@ -374,7 +386,7 @@ uint32_t usb_write(const byte_t* data, const size_t len) {
 //* \fn    AT91F_USB_SendData\r
 //* \brief Send Data through the control endpoint\r
 //*----------------------------------------------------------------------------\r
 //* \fn    AT91F_USB_SendData\r
 //* \brief Send Data through the control endpoint\r
 //*----------------------------------------------------------------------------\r

-unsigned int csrTab[100];\r
+unsigned int csrTab[100] = {0x00};\r

 unsigned char csrIdx = 0;\r
 \r
 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {\r
 unsigned char csrIdx = 0;\r
 \r
 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {\r