/*
* at91sam7s USB CDC device implementation
*
* Copyright (c) 2012, Roel Verdult
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* based on the "Basic USB Example" from ATMEL (doc6123.pdf)
*
* @file usb_cdc.c
* @brief
*/
#include "usb_cdc.h"
#include "config_gpio.h"
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define AT91C_EP_IN_SIZE 0x40
#define AT91C_EP_OUT 1
#define AT91C_EP_OUT_SIZE 0x40
#define AT91C_EP_IN 2
const char devDescriptor[] = {
/* Device descriptor */
0x12, // bLength
0x01, // bDescriptorType
//0x10,0x01, // Complies with USB Spec. Release (0110h = release 1.10)
0x00,0x02, // Complies with USB Spec. Release (0110h = release 2.00)
0x02, // bDeviceClass: CDC class code
0x00, // bDeviceSubclass: CDC class sub code
0x00, // bDeviceProtocol: CDC Device protocol
0x08, // bMaxPacketSize0
0x2d,0x2d, // Vendor ID (--)
0x4d,0x50, // Product ID (PM), transmitted in reverse
0x01,0x00, // Device release number (0001)
0x01, // iManufacturer // 0x01
0x00, // iProduct
0xFD, // SerialNumber
0x01 // bNumConfigs
};
const char cfgDescriptor[] = {
/* ============== CONFIGURATION 1 =========== */
/* Configuration 1 descriptor */
0x09, // CbLength
0x02, // CbDescriptorType
0x43, // CwTotalLength 2 EP + Control
0x00,
0x02, // CbNumInterfaces
0x01, // CbConfigurationValue
0x00, // CiConfiguration
0xC0, // CbmAttributes 0xA0
0xFA, // CMaxPower
/* Communication Class Interface Descriptor Requirement */
0x09, // bLength
0x04, // bDescriptorType
0x00, // bInterfaceNumber
0x00, // bAlternateSetting
0x01, // bNumEndpoints
0x02, // bInterfaceClass
0x02, // bInterfaceSubclass
0x01, // bInterfaceProtocol
0x00, // iInterface
/* Header Functional Descriptor */
0x05, // bFunction Length
0x24, // bDescriptor type: CS_INTERFACE
0x00, // bDescriptor subtype: Header Func Desc
0x10, // bcdCDC:1.1
0x01,
/* ACM Functional Descriptor */
0x04, // bFunctionLength
0x24, // bDescriptor Type: CS_INTERFACE
0x02, // bDescriptor Subtype: ACM Func Desc
0x02, // bmCapabilities
/* Union Functional Descriptor */
0x05, // bFunctionLength
0x24, // bDescriptorType: CS_INTERFACE
0x06, // bDescriptor Subtype: Union Func Desc
0x00, // bMasterInterface: Communication Class Interface
0x01, // bSlaveInterface0: Data Class Interface
/* Call Management Functional Descriptor */
0x05, // bFunctionLength
0x24, // bDescriptor Type: CS_INTERFACE
0x01, // bDescriptor Subtype: Call Management Func Desc
0x00, // bmCapabilities: D1 + D0
0x01, // bDataInterface: Data Class Interface 1
/* Endpoint 1 descriptor */
0x07, // bLength
0x05, // bDescriptorType
0x83, // bEndpointAddress, Endpoint 03 - IN
0x03, // bmAttributes INT
0x08, // wMaxPacketSize
0x00,
0xFF, // bInterval
/* Data Class Interface Descriptor Requirement */
0x09, // bLength
0x04, // bDescriptorType
0x01, // bInterfaceNumber
0x00, // bAlternateSetting
0x02, // bNumEndpoints
0x0A, // bInterfaceClass
0x00, // bInterfaceSubclass
0x00, // bInterfaceProtocol
0x00, // iInterface
/* First alternate setting */
/* Endpoint 1 descriptor */
0x07, // bLength
0x05, // bDescriptorType
0x01, // bEndpointAddress, Endpoint 01 - OUT
0x02, // bmAttributes BULK
AT91C_EP_OUT_SIZE, // wMaxPacketSize
0x00,
0x00, // bInterval
/* Endpoint 2 descriptor */
0x07, // bLength
0x05, // bDescriptorType
0x82, // bEndpointAddress, Endpoint 02 - IN
0x02, // bmAttributes BULK
AT91C_EP_IN_SIZE, // wMaxPacketSize
0x00,
0x00 // bInterval
};
const char strDescriptor[] = {
26, // Length
0x03, // Type is string
'p', 0x00,
'r', 0x00,
'o', 0x00,
'x', 0x00,
'm', 0x00,
'a', 0x00,
'r', 0x00,
'k', 0x00,
'.', 0x00,
'o', 0x00,
'r', 0x00,
'g', 0x00,
};
// Bitmap for all status bits in CSR.
#define REG_NO_EFFECT_1_ALL AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 \
|AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP \
|AT91C_UDP_TXCOMP
// Clear flags in the UDP_CSR register and waits for synchronization
#define UDP_CLEAR_EP_FLAGS(endpoint, flags) { \
volatile unsigned int reg; \
reg = pUdp->UDP_CSR[(endpoint)]; \
reg |= REG_NO_EFFECT_1_ALL; \
reg &= ~(flags); \
pUdp->UDP_CSR[(endpoint)] = reg; \
while ( (pUdp->UDP_CSR[(endpoint)] & (flags)) == (flags)); \
} \
// reset flags in the UDP_CSR register and waits for synchronization
#define UDP_SET_EP_FLAGS(endpoint, flags) { \
volatile unsigned int reg; \
reg = pUdp->UDP_CSR[(endpoint)]; \
reg |= REG_NO_EFFECT_1_ALL; \
reg |= (flags); \
pUdp->UDP_CSR[(endpoint)] = reg; \
while ( ( pUdp->UDP_CSR[(endpoint)] & (flags)) != (flags)); \
} \
/* USB standard request code */
#define STD_GET_STATUS_ZERO 0x0080
#define STD_GET_STATUS_INTERFACE 0x0081
#define STD_GET_STATUS_ENDPOINT 0x0082
#define STD_CLEAR_FEATURE_ZERO 0x0100
#define STD_CLEAR_FEATURE_INTERFACE 0x0101
#define STD_CLEAR_FEATURE_ENDPOINT 0x0102
#define STD_SET_FEATURE_ZERO 0x0300
#define STD_SET_FEATURE_INTERFACE 0x0301
#define STD_SET_FEATURE_ENDPOINT 0x0302
#define STD_SET_ADDRESS 0x0500
#define STD_GET_DESCRIPTOR 0x0680
#define STD_SET_DESCRIPTOR 0x0700
#define STD_GET_CONFIGURATION 0x0880
#define STD_SET_CONFIGURATION 0x0900
#define STD_GET_INTERFACE 0x0A81
#define STD_SET_INTERFACE 0x0B01
#define STD_SYNCH_FRAME 0x0C82
/* CDC Class Specific Request Code */
#define GET_LINE_CODING 0x21A1
#define SET_LINE_CODING 0x2021
#define SET_CONTROL_LINE_STATE 0x2221
typedef struct {
unsigned int dwDTERRate;
char bCharFormat;
char bParityType;
char bDataBits;
} AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;
AT91S_CDC_LINE_CODING line = {
115200, // baudrate
0, // 1 Stop Bit
0, // None Parity
8}; // 8 Data bits
void AT91F_CDC_Enumerate();
AT91PS_UDP pUdp = AT91C_BASE_UDP;
byte_t btConfiguration = 0;
byte_t btConnection = 0;
byte_t btReceiveBank = AT91C_UDP_RX_DATA_BK0;
//*----------------------------------------------------------------------------
//* \fn usb_disable
//* \brief This function deactivates the USB device
//*----------------------------------------------------------------------------
void usb_disable() {
// Disconnect the USB device
AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;
// Clear all lingering interrupts
if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {
pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
}
}
//*----------------------------------------------------------------------------
//* \fn usb_enable
//* \brief This function Activates the USB device
//*----------------------------------------------------------------------------
void usb_enable() {
// Set the PLL USB Divider
AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
// Specific Chip USB Initialisation
// Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock
AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
// Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO
// Set in PIO mode and Configure in Output
AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode
AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output
// Clear for set the Pullup resistor
AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;
// Disconnect and reconnect USB controller for 100ms
usb_disable();
// Wait for a short while
for (volatile size_t i=0; i<0x100000; i++);
//sleep(1);
// Reconnect USB reconnect
AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;
AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;
}
//*----------------------------------------------------------------------------
//* \fn usb_check
//* \brief Test if the device is configured and handle enumeration
//*----------------------------------------------------------------------------
bool usb_check() {
AT91_REG isr = pUdp->UDP_ISR;
if (isr & AT91C_UDP_ENDBUSRES) {
pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
// reset all endpoints
pUdp->UDP_RSTEP = (unsigned int)-1;
pUdp->UDP_RSTEP = 0;
// Enable the function
pUdp->UDP_FADDR = AT91C_UDP_FEN;
// Configure endpoint 0
pUdp->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
}
else if (isr & AT91C_UDP_EPINT0) {
pUdp->UDP_ICR = AT91C_UDP_EPINT0;
AT91F_CDC_Enumerate();
}
return (btConfiguration) ? true : false;
}
bool usb_poll()
{
if (!usb_check()) return false;
return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);
}
/**
In github PR #129, some users appears to get a false positive from
usb_poll, which returns true, but the usb_read operation
still returns 0.
This check is basically the same as above, but also checks
that the length available to read is non-zero, thus hopefully fixes the
bug.
**/
bool usb_poll_validate_length()
{
if (!usb_check()) return false;
if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;
return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) > 0;
}
//*----------------------------------------------------------------------------
//* \fn usb_read
//* \brief Read available data from Endpoint OUT
//*----------------------------------------------------------------------------
uint32_t usb_read(byte_t* data, size_t len) {
byte_t bank = btReceiveBank;
uint32_t packetSize, nbBytesRcv = 0;
uint32_t time_out = 0;
while (len) {
if (!usb_check()) break;
if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {
packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);
len -= packetSize;
while(packetSize--)
data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
UDP_CLEAR_EP_FLAGS(AT91C_EP_OUT, bank)
//pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);
if (bank == AT91C_UDP_RX_DATA_BK0)
bank = AT91C_UDP_RX_DATA_BK1;
else
bank = AT91C_UDP_RX_DATA_BK0;
}
if (time_out++ == 0x1fff) break;
}
btReceiveBank = bank;
return nbBytesRcv;
}
//*----------------------------------------------------------------------------
//* \fn usb_write
//* \brief Send through endpoint 2
//*----------------------------------------------------------------------------
uint32_t usb_write(const byte_t* data, const size_t len) {
size_t length = len;
uint32_t cpt = 0;
if (!length) return 0;
if (!usb_check()) return 0;
// Send the first packet
cpt = MIN(length, AT91C_EP_IN_SIZE-1);
length -= cpt;
while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY)
//pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
while (length) {
// Fill the second bank
cpt = MIN(length, AT91C_EP_IN_SIZE-1);
length -= cpt;
while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
// Wait for the first bank to be sent
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
if (!usb_check()) return length;
}
UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP)
//pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
//while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY)
//pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
}
// Wait for the end of transfer
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
if (!usb_check()) return length;
}
UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP)
//pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
//while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
return length;
}
//*----------------------------------------------------------------------------
//* \fn AT91F_USB_SendData
//* \brief Send Data through the control endpoint
//*----------------------------------------------------------------------------
unsigned int csrTab[100] = {0x00};
unsigned char csrIdx = 0;
static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
uint32_t cpt = 0;
AT91_REG csr;
do {
cpt = MIN(length, 8);
length -= cpt;
while (cpt--)
pUdp->UDP_FDR[0] = *pData++;
if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)
//pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
//while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
UDP_SET_EP_FLAGS(0, AT91C_UDP_TXPKTRDY)
// pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
do {
csr = pUdp->UDP_CSR[0];
// Data IN stage has been stopped by a status OUT
if (csr & AT91C_UDP_RX_DATA_BK0) {
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RX_DATA_BK0)
//pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
return;
}
} while ( !(csr & AT91C_UDP_TXCOMP) );
} while (length);
if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)
//pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
//while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
}
//*----------------------------------------------------------------------------
//* \fn AT91F_USB_SendZlp
//* \brief Send zero length packet through the control endpoint
//*----------------------------------------------------------------------------
void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
UDP_SET_EP_FLAGS(0, AT91C_UDP_TXPKTRDY)
//pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_TXCOMP)
//pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
//while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}
//*----------------------------------------------------------------------------
//* \fn AT91F_USB_SendStall
//* \brief Stall the control endpoint
//*----------------------------------------------------------------------------
void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
}
//*----------------------------------------------------------------------------
//* \fn AT91F_CDC_Enumerate
//* \brief This function is a callback invoked when a SETUP packet is received
//*----------------------------------------------------------------------------
void AT91F_CDC_Enumerate() {
byte_t bmRequestType, bRequest;
uint16_t wValue, wIndex, wLength, wStatus;
if ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
return;
bmRequestType = pUdp->UDP_FDR[0];
bRequest = pUdp->UDP_FDR[0];
wValue = (pUdp->UDP_FDR[0] & 0xFF);
wValue |= (pUdp->UDP_FDR[0] << 8);
wIndex = (pUdp->UDP_FDR[0] & 0xFF);
wIndex |= (pUdp->UDP_FDR[0] << 8);
wLength = (pUdp->UDP_FDR[0] & 0xFF);
wLength |= (pUdp->UDP_FDR[0] << 8);
if (bmRequestType & 0x80) {
UDP_SET_EP_FLAGS(0, AT91C_UDP_DIR)
//pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;
//while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );
}
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RXSETUP)
//pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
//while ( (pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) );
// Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
switch ((bRequest << 8) | bmRequestType) {
case STD_GET_DESCRIPTOR:
if (wValue == 0x100) // Return Device Descriptor
AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));
else if (wValue == 0x200) // Return Configuration Descriptor
AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
else if ((wValue & 0x300) == 0x300) // Return String Descriptor
AT91F_USB_SendData(pUdp, strDescriptor, MIN(sizeof(strDescriptor), wLength));
else
AT91F_USB_SendStall(pUdp);
break;
case STD_SET_ADDRESS:
AT91F_USB_SendZlp(pUdp);
pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);
pUdp->UDP_GLBSTATE = (wValue) ? AT91C_UDP_FADDEN : 0;
break;
case STD_SET_CONFIGURATION:
btConfiguration = wValue;
AT91F_USB_SendZlp(pUdp);
pUdp->UDP_GLBSTATE = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
pUdp->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
pUdp->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN) : 0;
pUdp->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN) : 0;
break;
case STD_GET_CONFIGURATION:
AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));
break;
case STD_GET_STATUS_ZERO:
wStatus = 0;
AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
break;
case STD_GET_STATUS_INTERFACE:
wStatus = 0;
AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
break;
case STD_GET_STATUS_ENDPOINT:
wStatus = 0;
wIndex &= 0x0F;
if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
}
else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
}
else
AT91F_USB_SendStall(pUdp);
break;
case STD_SET_FEATURE_ZERO:
AT91F_USB_SendStall(pUdp);
break;
case STD_SET_FEATURE_INTERFACE:
AT91F_USB_SendZlp(pUdp);
break;
case STD_SET_FEATURE_ENDPOINT:
wIndex &= 0x0F;
if ((wValue == 0) && wIndex && (wIndex <= 3)) {
pUdp->UDP_CSR[wIndex] = 0;
AT91F_USB_SendZlp(pUdp);
}
else
AT91F_USB_SendStall(pUdp);
break;
case STD_CLEAR_FEATURE_ZERO:
AT91F_USB_SendStall(pUdp);
break;
case STD_CLEAR_FEATURE_INTERFACE:
AT91F_USB_SendZlp(pUdp);
break;
case STD_CLEAR_FEATURE_ENDPOINT:
wIndex &= 0x0F;
if ((wValue == 0) && wIndex && (wIndex <= 3)) {
if (wIndex == 1)
pUdp->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
else if (wIndex == 2)
pUdp->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
else if (wIndex == 3)
pUdp->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
AT91F_USB_SendZlp(pUdp);
}
else
AT91F_USB_SendStall(pUdp);
break;
// handle CDC class requests
case SET_LINE_CODING:
while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
UDP_CLEAR_EP_FLAGS(0, AT91C_UDP_RX_DATA_BK0)
//pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
AT91F_USB_SendZlp(pUdp);
break;
case GET_LINE_CODING:
AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));
break;
case SET_CONTROL_LINE_STATE:
btConnection = wValue;
AT91F_USB_SendZlp(pUdp);
break;
default:
AT91F_USB_SendStall(pUdp);
break;
}
}