In my attempts to make the LEGIC code better, its not working now. Timings if...

[proxmark3-svn] / common / usb_cdc.c

diff --git a/common/usb_cdc.c b/common/usb_cdc.c
index ccbb3c50e91389a4d733e25f75c7f94e50e77ef5..5111ac1fe84cbc7a71bf38afcab48394dd22ed9a 100644 (file)
--- a/common/usb_cdc.c
+++ b/common/usb_cdc.c
@@ -46,7 +46,8 @@ const char devDescriptor[] = {
        /* Device descriptor */\r
        0x12,      // bLength\r
        0x01,      // bDescriptorType\r
        /* Device descriptor */\r
        0x12,      // bLength\r
        0x01,      // bDescriptorType\r

-       0x10,0x01, // Complies with USB Spec. Release (0110h = release 1.10)\r
+       //0x10,0x01, // Complies with USB Spec. Release (0110h = release 1.10)\r
+       0x00,0x02, // Complies with USB Spec. Release (0110h = release 2.00)\r

        0x02,      // bDeviceClass:    CDC class code\r
        0x00,      // bDeviceSubclass: CDC class sub code\r
        0x00,      // bDeviceProtocol: CDC Device protocol\r
        0x02,      // bDeviceClass:    CDC class code\r
        0x00,      // bDeviceSubclass: CDC class sub code\r
        0x00,      // bDeviceProtocol: CDC Device protocol\r


@@ -152,7 +153,7 @@ const char cfgDescriptor[] = {
 };\r
 \r
 const char strDescriptor[] = {\r
 };\r
 \r
 const char strDescriptor[] = {\r

-  26,                          // Length\r
+  26,                  // Length\r

   0x03,                        // Type is string\r
   'p', 0x00,\r
   'r', 0x00,\r
   0x03,                        // Type is string\r
   'p', 0x00,\r
   'r', 0x00,\r


@@ -168,7 +169,32 @@ const char strDescriptor[] = {
   'g', 0x00,\r
 };\r
 \r
   'g', 0x00,\r
 };\r
 \r

+// Bitmap for all status bits in CSR.\r
+#define REG_NO_EFFECT_1_ALL      AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 \\r
+                                |AT91C_UDP_STALLSENT   | AT91C_UDP_RXSETUP \\r
+                                |AT91C_UDP_TXCOMP\r
+\r
+// Clear flags in the UDP_CSR register and waits for synchronization\r
+#define UDP_CLEAR_EP_FLAGS(endpoint, flags) { \\r
+       volatile unsigned int reg; \\r
+       reg = pUdp->UDP_CSR[endpoint]; \\r
+       reg |= REG_NO_EFFECT_1_ALL; \\r
+       reg &= ~(flags); \\r
+       pUdp->UDP_CSR[endpoint] = reg; \\r
+       while ( (pUdp->UDP_CSR[endpoint] & (flags)) == (flags)); \\r
+}\r
+\r
+// reset flags in the UDP_CSR register and waits for synchronization\r
+#define UDP_SET_EP_FLAGS(endpoint, flags) { \\r
+       volatile unsigned int reg; \\r
+       reg = pUdp->UDP_CSR[endpoint]; \\r
+       reg |= REG_NO_EFFECT_1_ALL; \\r
+       reg |= (flags); \\r
+       pUdp->UDP_CSR[endpoint] = reg; \\r
+       while ( ( pUdp->UDP_CSR[endpoint] & (flags)) != (flags)); \\r
+}\r

 \r
 \r

+       \r

 /* USB standard request code */\r
 #define STD_GET_STATUS_ZERO           0x0080\r
 #define STD_GET_STATUS_INTERFACE      0x0081\r
 /* USB standard request code */\r
 #define STD_GET_STATUS_ZERO           0x0080\r
 #define STD_GET_STATUS_INTERFACE      0x0081\r


@@ -221,13 +247,13 @@ byte_t btReceiveBank   = AT91C_UDP_RX_DATA_BK0;
 //* \brief This function deactivates the USB device\r
 //*----------------------------------------------------------------------------\r
 void usb_disable() {\r
 //* \brief This function deactivates the USB device\r
 //*----------------------------------------------------------------------------\r
 void usb_disable() {\r

-  // Disconnect the USB device\r
-  AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;\r
-  \r
-  // Clear all lingering interrupts\r
-  if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {\r
-    pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;\r
-  }\r
+       // Disconnect the USB device\r
+       AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;\r
+\r
+       // Clear all lingering interrupts\r
+       if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {\r
+               pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;\r
+       }\r

 }\r
 \r
 //*----------------------------------------------------------------------------\r
 }\r
 \r
 //*----------------------------------------------------------------------------\r


@@ -235,31 +261,32 @@ void usb_disable() {
 //* \brief This function Activates the USB device\r
 //*----------------------------------------------------------------------------\r
 void usb_enable() {\r
 //* \brief This function Activates the USB device\r
 //*----------------------------------------------------------------------------\r
 void usb_enable() {\r

-  // Set the PLL USB Divider\r
-  AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;\r
-  \r
-  // Specific Chip USB Initialisation\r
-  // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock\r
-  AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;\r
-  AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);\r
-  \r
-  // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO\r
-  // Set in PIO mode and Configure in Output\r
-  AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode\r
+       // Set the PLL USB Divider\r
+       AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;\r
+\r
+       // Specific Chip USB Initialisation\r
+       // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock\r
+       AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;\r
+       AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);\r
+\r
+       // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO\r
+       // Set in PIO mode and Configure in Output\r
+       AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode\r

        AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output\r
        AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output\r

-  \r
-  // Clear for set the Pullup resistor\r
+\r
+       // Clear for set the Pullup resistor\r

        AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;\r
        AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;\r

-  \r
-  // Disconnect and reconnect USB controller for 100ms\r
-  usb_disable();\r
-  \r
-  // Wait for a short while\r
-  for (volatile size_t i=0; i<0x100000; i++);\r

 \r
 \r

-  // Reconnect USB reconnect\r
-  AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
-  AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;\r
+       // Disconnect and reconnect USB controller for 100ms\r
+       usb_disable();\r
+\r
+       // Wait for a short while\r
+       for (volatile size_t i=0; i<0x100000; i++);\r
+    //sleep(1);\r
+       \r
+       // Reconnect USB reconnect\r
+       AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
+       AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;\r

 }\r
 \r
 //*----------------------------------------------------------------------------\r
 }\r
 \r
 //*----------------------------------------------------------------------------\r


@@ -289,8 +316,23 @@ bool usb_check() {
 \r
 bool usb_poll()\r
 {\r
 \r
 bool usb_poll()\r
 {\r

-  if (!usb_check()) return false;\r
-  return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);\r
+       if (!usb_check()) return false;\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
+       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
 }\r
 \r
 //*----------------------------------------------------------------------------\r


@@ -298,26 +340,29 @@ bool usb_poll()
 //* \brief Read available data from Endpoint OUT\r
 //*----------------------------------------------------------------------------\r
 uint32_t usb_read(byte_t* data, size_t len) {\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
        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
   \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

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

                        while(packetSize--)\r
                                data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];\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
+                       \r
+                       UDP_CLEAR_EP_FLAGS(AT91C_EP_OUT, bank)                  \r
+                       //pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);\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
-                               bank = AT91C_UDP_RX_DATA_BK0;\r
-      }\r
+                       else\r
+                               bank = AT91C_UDP_RX_DATA_BK0;           \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


@@ -329,39 +374,46 @@ uint32_t usb_read(byte_t* data, size_t len) {
 //* \brief Send through endpoint 2\r
 //*----------------------------------------------------------------------------\r
 uint32_t usb_write(const byte_t* data, const size_t len) {\r
 //* \brief Send through endpoint 2\r
 //*----------------------------------------------------------------------------\r
 uint32_t usb_write(const byte_t* data, const size_t len) {\r

-  size_t length = len;\r
+       size_t length = len;\r

        uint32_t cpt = 0;\r
 \r
        uint32_t cpt = 0;\r
 \r

-  if (!length) return 0;\r
-  if (!usb_check()) return 0;\r
+       if (!length) return 0;\r
+       if (!usb_check()) return 0;\r

   \r
        // Send the first packet\r
        cpt = MIN(length, AT91C_EP_IN_SIZE-1);\r
        length -= cpt;\r
        while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r
   \r
        // Send the first packet\r
        cpt = MIN(length, AT91C_EP_IN_SIZE-1);\r
        length -= cpt;\r
        while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r

-       pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;\r
+\r
+       UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY)\r
+       //pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;\r

 \r
        while (length) {\r
                // Fill the second bank\r
                cpt = MIN(length, AT91C_EP_IN_SIZE-1);\r
                length -= cpt;\r
                while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r
 \r
        while (length) {\r
                // Fill the second bank\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
                while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
                        if (!usb_check()) return length;\r

-    }\r
-               pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);\r
-               while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r
-               pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;\r
+               }\r
+               \r
+               UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP)\r
+               //pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);            \r
+               //while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r
+               \r
+               UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY)\r
+               //pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;\r

        }\r
   \r
        // Wait for the end of transfer\r
        while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
                if (!usb_check()) return length;\r
        }\r
   \r
        // Wait for the end of transfer\r
        while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
                if (!usb_check()) return length;\r

-  }\r
-  \r
-       pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);\r
-       while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r
+       }\r
+\r
+       UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP)\r
+       //pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);\r
+       //while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r

 \r
        return length;\r
 }\r
 \r
        return length;\r
 }\r


@@ -385,17 +437,22 @@ static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t leng
                        pUdp->UDP_FDR[0] = *pData++;\r
 \r
                if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {\r
                        pUdp->UDP_FDR[0] = *pData++;\r
 \r
                if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {\r

-                       pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
-                       while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r
+                       \r
+                       UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)\r
+                       //pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
+                       //while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r

                }\r
 \r
                }\r
 \r

-               pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;\r
+               UDP_SET_EP_FLAGS(0, AT91C_UDP_TXPKTRDY)\r
+               // pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;\r

                do {\r
                        csr = pUdp->UDP_CSR[0];\r
 \r
                        // Data IN stage has been stopped by a status OUT\r
                        if (csr & AT91C_UDP_RX_DATA_BK0) {\r
                do {\r
                        csr = pUdp->UDP_CSR[0];\r
 \r
                        // Data IN stage has been stopped by a status OUT\r
                        if (csr & AT91C_UDP_RX_DATA_BK0) {\r

-                               pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);\r
+                               \r
+                               UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RX_DATA_BK0)\r
+                               //pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);\r

                                return;\r
                        }\r
                } while ( !(csr & AT91C_UDP_TXCOMP) );\r
                                return;\r
                        }\r
                } while ( !(csr & AT91C_UDP_TXCOMP) );\r


@@ -403,8 +460,10 @@ static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t leng
        } while (length);\r
 \r
        if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {\r
        } while (length);\r
 \r
        if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {\r

-               pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
-               while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r
+               \r
+               UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)\r
+               //pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
+               //while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r

        }\r
 }\r
 \r
        }\r
 }\r
 \r


@@ -413,10 +472,15 @@ static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t leng
 //* \brief Send zero length packet through the control endpoint\r
 //*----------------------------------------------------------------------------\r
 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {\r
 //* \brief Send zero length packet through the control endpoint\r
 //*----------------------------------------------------------------------------\r
 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {\r

-       pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;\r
+\r
+       UDP_SET_EP_FLAGS(0, AT91C_UDP_TXPKTRDY)\r
+       //pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;\r
+       \r

        while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );\r
        while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );\r

-       pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
-       while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r
+       \r
+       UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)\r
+       //pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);\r
+       //while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);\r

 }\r
 \r
 //*----------------------------------------------------------------------------\r
 }\r
 \r
 //*----------------------------------------------------------------------------\r


@@ -426,6 +490,7 @@ void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {\r
        pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;\r
        while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );\r
 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {\r
        pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;\r
        while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );\r

+       \r

        pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);\r
        while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));\r
 }\r
        pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);\r
        while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));\r
 }\r


@@ -451,11 +516,15 @@ void AT91F_CDC_Enumerate() {
        wLength      |= (pUdp->UDP_FDR[0] << 8);\r
 \r
        if (bmRequestType & 0x80) {\r
        wLength      |= (pUdp->UDP_FDR[0] << 8);\r
 \r
        if (bmRequestType & 0x80) {\r

-               pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;\r
-               while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );\r
+\r
+               UDP_SET_EP_FLAGS(0, AT91C_UDP_DIR)\r
+               //pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;\r
+               //while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );\r

        }\r
        }\r

-       pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;\r
-       while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );\r
+       \r
+       UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RXSETUP)\r
+       //pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;\r
+       //while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );\r

 \r
        // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1\r
        switch ((bRequest << 8) | bmRequestType) {\r
 \r
        // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1\r
        switch ((bRequest << 8) | bmRequestType) {\r


@@ -546,7 +615,8 @@ void AT91F_CDC_Enumerate() {
        // handle CDC class requests\r
        case SET_LINE_CODING:\r
                while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );\r
        // handle CDC class requests\r
        case SET_LINE_CODING:\r
                while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );\r

-               pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);\r
+               UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RX_DATA_BK0)\r
+               //pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);\r

                AT91F_USB_SendZlp(pUdp);\r
                break;\r
        case GET_LINE_CODING:\r
                AT91F_USB_SendZlp(pUdp);\r
                break;\r
        case GET_LINE_CODING:\r