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circuitpython/stm/lib/usbd_pyb_core.c

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/**
******************************************************************************
* @file usbd_cdc_core.c
* @author MCD Application Team
* @version V1.1.0
* @date 19-March-2012
* @brief This file provides the high layer firmware functions to manage the
* following functionalities of the USB CDC Class:
* - Initialization and Configuration of high and low layer
* - Enumeration as CDC Device (and enumeration for each implemented memory interface)
* - OUT/IN data transfer
* - Command IN transfer (class requests management)
* - Error management
*
* @verbatim
*
* ===================================================================
* CDC Class Driver Description
* ===================================================================
* This driver manages the "Universal Serial Bus Class Definitions for Communications Devices
* Revision 1.2 November 16, 2007" and the sub-protocol specification of "Universal Serial Bus
* Communications Class Subclass Specification for PSTN Devices Revision 1.2 February 9, 2007"
* This driver implements the following aspects of the specification:
* - Device descriptor management
* - Configuration descriptor management
* - Enumeration as CDC device with 2 data endpoints (IN and OUT) and 1 command endpoint (IN)
* - Requests management (as described in section 6.2 in specification)
* - Abstract Control Model compliant
* - Union Functional collection (using 1 IN endpoint for control)
* - Data interface class
* @note
* For the Abstract Control Model, this core allows only transmitting the requests to
* lower layer dispatcher (ie. usbd_cdc_vcp.c/.h) which should manage each request and
* perform relative actions.
*
* These aspects may be enriched or modified for a specific user application.
*
* This driver doesn't implement the following aspects of the specification
* (but it is possible to manage these features with some modifications on this driver):
* - Any class-specific aspect relative to communication classes should be managed by user application.
* - All communication classes other than PSTN are not managed
*
* @endverbatim
*
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include "usbd_cdc_core.h"
#include "usbd_desc.h"
#include "usbd_req.h"
#include "usbd_conf.h"
#include "usbd_msc_bot.h"
#include "usbd_msc_mem.h"
#define USB_PYB_CONFIG_DESC_SIZ (98) // for both CDC VCP and MSC interfaces
//#define USB_PYB_CONFIG_DESC_SIZ (67) // for only CDC VCP interfaces
#define MSC_EPIN_SIZE MSC_MAX_PACKET
#define MSC_EPOUT_SIZE MSC_MAX_PACKET
/*********************************************
PYB Device library callbacks
*********************************************/
static uint8_t usbd_pyb_Init (void *pdev, uint8_t cfgidx);
static uint8_t usbd_pyb_DeInit (void *pdev, uint8_t cfgidx);
static uint8_t usbd_pyb_Setup (void *pdev, USB_SETUP_REQ *req);
static uint8_t usbd_pyb_EP0_RxReady (void *pdev);
static uint8_t usbd_pyb_DataIn (void *pdev, uint8_t epnum);
static uint8_t usbd_pyb_DataOut (void *pdev, uint8_t epnum);
static uint8_t usbd_pyb_SOF (void *pdev);
/*********************************************
PYB specific management functions
*********************************************/
static void Handle_USBAsynchXfer (void *pdev);
static uint8_t *usbd_pyb_GetCfgDesc (uint8_t speed, uint16_t *length);
/** @defgroup usbd_cdc_Private_Variables
* @{
*/
extern CDC_IF_Prop_TypeDef VCP_fops;
extern uint8_t USBD_DeviceDesc [USB_SIZ_DEVICE_DESC];
__ALIGN_BEGIN static uint8_t usbd_cdc_AltSet __ALIGN_END = 0;
__ALIGN_BEGIN static uint8_t USB_Rx_Buffer[CDC_DATA_MAX_PACKET_SIZE] __ALIGN_END;
__ALIGN_BEGIN uint8_t APP_Rx_Buffer[APP_RX_DATA_SIZE] __ALIGN_END;
__ALIGN_BEGIN static uint8_t CmdBuff[CDC_CMD_PACKET_SZE] __ALIGN_END;
__ALIGN_BEGIN static uint8_t USBD_MSC_MaxLun __ALIGN_END = 0;
__ALIGN_BEGIN static uint8_t USBD_MSC_AltSet __ALIGN_END = 0;
uint32_t APP_Rx_ptr_in = 0;
uint32_t APP_Rx_ptr_out = 0;
uint32_t APP_Rx_length = 0;
uint8_t USB_Tx_State = 0;
static uint32_t cdcCmd = 0xFF;
static uint32_t cdcLen = 0;
/* PYB interface class callbacks structure */
USBD_Class_cb_TypeDef USBD_PYB_cb =
{
usbd_pyb_Init,
usbd_pyb_DeInit,
usbd_pyb_Setup,
NULL, // EP0_TxSent
usbd_pyb_EP0_RxReady,
usbd_pyb_DataIn,
usbd_pyb_DataOut,
usbd_pyb_SOF,
NULL, // IsoINIncomplete
NULL, // IsoOUTIncomplete
usbd_pyb_GetCfgDesc,
// for OTG_HS support need to add other cfg desc here
};
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma data_alignment=4
#endif
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
/* USB PYB device Configuration Descriptor */
__ALIGN_BEGIN static uint8_t usbd_pyb_CfgDesc[USB_PYB_CONFIG_DESC_SIZ] __ALIGN_END =
{
//--------------------------------------------------------------------------
// Configuration Descriptor
0x09, // bLength: Configuration Descriptor size
USB_CONFIGURATION_DESCRIPTOR_TYPE, // bDescriptorType: Configuration
LOBYTE(USB_PYB_CONFIG_DESC_SIZ), // wTotalLength: no of returned bytes
HIBYTE(USB_PYB_CONFIG_DESC_SIZ),
0x03, // bNumInterfaces: 3 interfaces
0x01, // bConfigurationValue: Configuration value
0x04, // iConfiguration: Index of string descriptor describing the configuration
0x80, // bmAttributes: bus powered; 0xc0 for self powered
0xfa, // bMaxPower: in units of 2mA
//==========================================================================
// Interface Association for CDC VCP
0x08, // bLength: 8 bytes
USB_INTERFACE_ASSOCIATION_TYPE, // bDescriptorType: IAD
0x00, // bFirstInterface: first interface for this association
0x02, // bInterfaceCount: nummber of interfaces for this association
0x00, // bFunctionClass: ?
0x00, // bFunctionSubClass: ?
0x00, // bFunctionProtocol: ?
0x04, // iFunction: index of string for this function
//--------------------------------------------------------------------------
// Interface Descriptor
0x09, // bLength: Interface Descriptor size
USB_INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType: Interface
0x00, // bInterfaceNumber: Number of Interface
0x00, // bAlternateSetting: Alternate setting
0x01, // bNumEndpoints: One endpoints used
0x02, // bInterfaceClass: Communication Interface Class
0x02, // bInterfaceSubClass: Abstract Control Model
0x01, // bInterfaceProtocol: Common AT commands
0x00, // iInterface:
// Header Functional Descriptor
0x05, // bLength: Endpoint Descriptor size
0x24, // bDescriptorType: CS_INTERFACE
0x00, // bDescriptorSubtype: Header Func Desc
0x10, // bcdCDC: spec release number
0x01, // ?
// Call Management Functional Descriptor
0x05, // bFunctionLength
0x24, // bDescriptorType: CS_INTERFACE
0x01, // bDescriptorSubtype: Call Management Func Desc
0x00, // bmCapabilities: D0+D1
0x01, // bDataInterface: 1
// ACM Functional Descriptor
0x04, // bFunctionLength
0x24, // bDescriptorType: CS_INTERFACE
0x02, // bDescriptorSubtype: Abstract Control Management desc
0x02, // bmCapabilities
// Union Functional Descriptor
0x05, // bFunctionLength
0x24, // bDescriptorType: CS_INTERFACE
0x06, // bDescriptorSubtype: Union func desc
0x00, // bMasterInterface: Communication class interface
0x01, // bSlaveInterface0: Data Class Interface
// Endpoint 2 Descriptor
0x07, // bLength: Endpoint Descriptor size
USB_ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType: Endpoint
CDC_CMD_EP, // bEndpointAddress
0x03, // bmAttributes: Interrupt
LOBYTE(CDC_CMD_PACKET_SZE), // wMaxPacketSize:
HIBYTE(CDC_CMD_PACKET_SZE),
0x80, // bInterval: polling interval in frames of 1ms
//--------------------------------------------------------------------------
// Data class interface descriptor
0x09, // bLength: Endpoint Descriptor size
USB_INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType: interface
0x01, // bInterfaceNumber: Number of Interface
0x00, // bAlternateSetting: Alternate setting
0x02, // bNumEndpoints: Two endpoints used
0x0A, // bInterfaceClass: CDC
0x00, // bInterfaceSubClass: ?
0x00, // bInterfaceProtocol: ?
0x00, // iInterface:
// Endpoint OUT Descriptor
0x07, // bLength: Endpoint Descriptor size
USB_ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType: Endpoint
CDC_OUT_EP, // bEndpointAddress
0x02, // bmAttributes: Bulk
LOBYTE(CDC_DATA_MAX_PACKET_SIZE), // wMaxPacketSize:
HIBYTE(CDC_DATA_MAX_PACKET_SIZE),
0x00, // bInterval: ignore for Bulk transfer
// Endpoint IN Descriptor
0x07, // bLength: Endpoint Descriptor size
USB_ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType: Endpoint
CDC_IN_EP, // bEndpointAddress
0x02, // bmAttributes: Bulk
LOBYTE(CDC_DATA_MAX_PACKET_SIZE), // wMaxPacketSize:
HIBYTE(CDC_DATA_MAX_PACKET_SIZE),
0x00, // bInterval: ignore for Bulk transfer
//==========================================================================
// MSC only has 1 interface so doesn't need an IAD
//--------------------------------------------------------------------------
// Interface Descriptor
0x09, // bLength: Interface Descriptor size
USB_INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType: interface descriptor
0x02, // bInterfaceNumber: Number of Interface
0x00, // bAlternateSetting: Alternate setting
0x02, // bNumEndpoints
0x08, // bInterfaceClass: MSC Class
0x06, // bInterfaceSubClass : SCSI transparent
0x50, // nInterfaceProtocol
0x00, // iInterface:
// Endpoint IN descriptor
0x07, // bLength: Endpoint descriptor length
USB_ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType: Endpoint descriptor type
MSC_IN_EP, // bEndpointAddress: IN, address 3
0x02, // bmAttributes: Bulk endpoint type
LOBYTE(MSC_MAX_PACKET), // wMaxPacketSize
HIBYTE(MSC_MAX_PACKET),
0x00, // bInterval: ignore for Bulk transfer
// Endpoint OUT descriptor
0x07, // bLength: Endpoint descriptor length
USB_ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType: Endpoint descriptor type
MSC_OUT_EP, // bEndpointAddress: OUT, address 3
0x02, // bmAttributes: Bulk endpoint type
LOBYTE(MSC_MAX_PACKET), // wMaxPacketSize
HIBYTE(MSC_MAX_PACKET),
0x00, // bInterval: ignore for Bulk transfer
};
/** @defgroup usbd_pyb_Private_Functions
* @{
*/
/**
* @brief usbd_pyb_Init
* Initilaize the PYB interface
* @param pdev: device instance
* @param cfgidx: Configuration index
* @retval status
*/
static uint8_t usbd_pyb_Init(void *pdev, uint8_t cfgidx) {
// deinit first to reset
usbd_pyb_DeInit(pdev, cfgidx);
//----------------------------------
// CDC VCP component
// Open EP IN
DCD_EP_Open(pdev,
CDC_IN_EP,
CDC_DATA_IN_PACKET_SIZE,
USB_OTG_EP_BULK);
// Open EP OUT
DCD_EP_Open(pdev,
CDC_OUT_EP,
CDC_DATA_OUT_PACKET_SIZE,
USB_OTG_EP_BULK);
// Open Command IN EP
DCD_EP_Open(pdev,
CDC_CMD_EP,
CDC_CMD_PACKET_SZE,
USB_OTG_EP_INT);
/*
// can use this to dynamically set the device class
uint8_t *pbuf = USBD_DeviceDesc;
pbuf[4] = DEVICE_CLASS_CDC;
pbuf[5] = DEVICE_SUBCLASS_CDC;
*/
// Initialize the Interface physical components
VCP_fops.pIf_Init();
// Prepare Out endpoint to receive next packet */
DCD_EP_PrepareRx(pdev,
CDC_OUT_EP,
(uint8_t*)(USB_Rx_Buffer),
CDC_DATA_OUT_PACKET_SIZE);
//----------------------------------
// MSC component
// Open EP IN
DCD_EP_Open(pdev,
MSC_IN_EP,
MSC_EPIN_SIZE,
USB_OTG_EP_BULK);
// Open EP OUT
DCD_EP_Open(pdev,
MSC_OUT_EP,
MSC_EPOUT_SIZE,
USB_OTG_EP_BULK);
// Init the BOT layer
MSC_BOT_Init(pdev);
return USBD_OK;
}
/**
* @brief usbd_pyb_Init
* DeInitialize the CDC layer
* @param pdev: device instance
* @param cfgidx: Configuration index
* @retval status
*/
static uint8_t usbd_pyb_DeInit(void *pdev, uint8_t cfgidx) {
//----------------------------------
// CDC VCP component
// close CDC EPs
DCD_EP_Close(pdev, CDC_IN_EP);
DCD_EP_Close(pdev, CDC_OUT_EP);
DCD_EP_Close(pdev, CDC_CMD_EP);
// Restore default state of the Interface physical components
VCP_fops.pIf_DeInit();
//----------------------------------
// MSC component
// Close MSC EPs
DCD_EP_Close(pdev, MSC_IN_EP);
DCD_EP_Close(pdev, MSC_OUT_EP);
// Un Init the BOT layer
MSC_BOT_DeInit(pdev);
return USBD_OK;
}
#define BOT_GET_MAX_LUN 0xFE
#define BOT_RESET 0xFF
/**
* @brief usbd_pyb_Setup
* Handle the CDC specific requests
* @param pdev: instance
* @param req: usb requests
* @retval status
*/
static uint8_t usbd_pyb_Setup(void *pdev, USB_SETUP_REQ *req) {
switch (req->bmRequest & (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)) {
// Standard Device Request ---------------------------------------------
case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_DEVICE):
/*
switch (req->bRequest) {
case USB_REQ_GET_DESCRIPTOR:
{
uint16_t len = USB_CDC_DESC_SIZ; // XXX WRONG!
uint8_t *pbuf = usbd_pyb_CfgDesc + 9;
if ((req->wValue >> 8) == CDC_DESCRIPTOR_TYPE) {
pbuf = usbd_pyb_CfgDesc + 9 + (9 * USBD_ITF_MAX_NUM); // TODO
len = MIN(USB_CDC_DESC_SIZ, req->wLength); // TODO
}
return USBD_CtlSendData(pdev, pbuf, len);
}
}
*/
break;
// Standard Interface Request ------------------------------------------
case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_INTERFACE):
switch (req->bRequest) {
case USB_REQ_GET_INTERFACE:
// wIndex & 0xff is the interface
if ((req->wIndex & 0xff) <= 1) {
return USBD_CtlSendData(pdev, &usbd_cdc_AltSet, 1);
} else {
return USBD_CtlSendData(pdev, &USBD_MSC_AltSet, 1);
}
case USB_REQ_SET_INTERFACE:
if ((uint8_t)(req->wValue) < USBD_ITF_MAX_NUM) { // TODO
if ((req->wIndex & 0xff) <= 1) {
usbd_cdc_AltSet = req->wValue;
} else {
USBD_MSC_AltSet = req->wValue;
}
return USBD_OK;
}
}
break;
// Standard Endpoint Request -------------------------------------------
case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_ENDPOINT):
// req->wIndex is the endpoint number, including direction
if (req->wIndex == MSC_IN_EP || req->wIndex == MSC_OUT_EP) {
// MSC component
switch (req->bRequest) {
case USB_REQ_CLEAR_FEATURE:
// Flush the FIFO and Clear the stall status
DCD_EP_Flush(pdev, (uint8_t)req->wIndex);
// Re-activate the EP
DCD_EP_Close(pdev, (uint8_t)req->wIndex);
if ((((uint8_t)req->wIndex) & 0x80) == 0x80) {
DCD_EP_Open(pdev, ((uint8_t)req->wIndex), MSC_EPIN_SIZE, USB_OTG_EP_BULK);
} else {
DCD_EP_Open(pdev, ((uint8_t)req->wIndex), MSC_EPOUT_SIZE, USB_OTG_EP_BULK);
}
// Handle BOT error
MSC_BOT_CplClrFeature(pdev, (uint8_t)req->wIndex);
return USBD_OK;
}
}
break;
// CDC Class Requests ------------------------------
case (USB_REQ_TYPE_CLASS | USB_REQ_RECIPIENT_INTERFACE):
// req->wIndex is the recipient interface number
if (req->wIndex == 0) {
// CDC component, communications interface (TODO do we need to handle if#1?)
// Check if the request is a data setup packet
if (req->wLength) {
if (req->bmRequest & 0x80) {
// Device-to-Host request
// Get the data to be sent to Host from interface layer
VCP_fops.pIf_Ctrl(req->bRequest, CmdBuff, req->wLength);
// Send the data to the host
return USBD_CtlSendData(pdev, CmdBuff, req->wLength);
} else {
// Host-to-Device requeset
// Set the value of the current command to be processed */
cdcCmd = req->bRequest;
cdcLen = req->wLength;
// Prepare the reception of the buffer over EP0
// Next step: the received data will be managed in usbd_cdc_EP0_TxSent() function.
return USBD_CtlPrepareRx(pdev, CmdBuff, req->wLength);
}
} else {
// Not a Data request
// Transfer the command to the interface layer */
return VCP_fops.pIf_Ctrl(req->bRequest, NULL, 0);
}
} else if (req->wIndex == 2) {
// MSC component
switch (req->bRequest) {
case BOT_GET_MAX_LUN:
if ((req->wValue == 0) && (req->wLength == 1) && ((req->bmRequest & 0x80) == 0x80)) {
USBD_MSC_MaxLun = USBD_STORAGE_fops->GetMaxLun();
if (USBD_MSC_MaxLun > 0) {
return USBD_CtlSendData(pdev, &USBD_MSC_MaxLun, 1);
}
}
break;
case BOT_RESET:
if ((req->wValue == 0) && (req->wLength == 0) && ((req->bmRequest & 0x80) != 0x80)) {
MSC_BOT_Reset(pdev);
return USBD_OK;
}
break;
}
}
break;
}
printf("SU %x %x %x %x\n", req->bmRequest, req->bRequest, req->wValue, req->wIndex);
// invalid command
USBD_CtlError(pdev, req);
return USBD_FAIL;
}
/**
* @brief usbd_pyb_EP0_RxReady
* Data received on control endpoint
* @param pdev: device device instance
* @retval status
*/
static uint8_t usbd_pyb_EP0_RxReady(void *pdev) {
if (cdcCmd != NO_CMD) {
// Process the data
VCP_fops.pIf_Ctrl(cdcCmd, CmdBuff, cdcLen);
// Reset the command variable to default value
cdcCmd = NO_CMD;
}
return USBD_OK;
}
/**
* @brief usbd_pyb_DataIn
* Data sent on non-control IN endpoint
* @param pdev: device instance
* @param epnum: endpoint number
* @retval status
*/
static uint8_t usbd_pyb_DataIn(void *pdev, uint8_t epnum) {
uint16_t USB_Tx_ptr;
uint16_t USB_Tx_length;
switch (epnum) {
case (CDC_IN_EP & 0x7f): // TODO is this correct?
case (CDC_CMD_EP & 0x7f): // TODO is this correct?
if (USB_Tx_State == 1) {
if (APP_Rx_length == 0) {
USB_Tx_State = 0;
} else {
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE) {
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
APP_Rx_ptr_out += CDC_DATA_IN_PACKET_SIZE;
APP_Rx_length -= CDC_DATA_IN_PACKET_SIZE;
} else {
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = APP_Rx_length;
APP_Rx_ptr_out += APP_Rx_length;
APP_Rx_length = 0;
}
// Prepare the available data buffer to be sent on IN endpoint
DCD_EP_Tx(pdev,
CDC_IN_EP,
(uint8_t*)&APP_Rx_Buffer[USB_Tx_ptr],
USB_Tx_length);
}
}
return USBD_OK;
case (MSC_IN_EP & 0x7f): // TODO?
MSC_BOT_DataIn(pdev, epnum);
return USBD_OK;
}
printf("DI %x\n", epnum);
return USBD_OK;
}
/**
* @brief usbd_pyb_DataOut
* Data received on non-control Out endpoint
* @param pdev: device instance
* @param epnum: endpoint number
* @retval status
*/
static uint8_t usbd_pyb_DataOut(void *pdev, uint8_t epnum) {
uint16_t USB_Rx_Cnt;
switch (epnum) {
case (CDC_OUT_EP & 0x7f): // TODO is this correct?
// Get the received data buffer and update the counter */
USB_Rx_Cnt = ((USB_OTG_CORE_HANDLE*)pdev)->dev.out_ep[epnum].xfer_count;
/* USB data will be immediately processed, this allow next USB traffic being
NAKed till the end of the application Xfer */
VCP_fops.pIf_DataRx(USB_Rx_Buffer, USB_Rx_Cnt);
// Prepare Out endpoint to receive next packet */
DCD_EP_PrepareRx(pdev,
CDC_OUT_EP,
(uint8_t*)(USB_Rx_Buffer),
CDC_DATA_OUT_PACKET_SIZE);
return USBD_OK;
case (MSC_OUT_EP & 0x7f): // TODO is this correct?
MSC_BOT_DataOut(pdev, epnum);
return USBD_OK;
}
printf("DO %x\n", epnum);
return USBD_OK;
}
/**
* @brief usbd_pyb_SOF
* Start Of Frame event management
* @param pdev: instance
* @retval status
*/
static uint8_t usbd_pyb_SOF(void *pdev) {
static uint32_t FrameCount = 0;
// TODO do we need to check that this is for CDC/VCP? can we even do that?
if (FrameCount++ == CDC_IN_FRAME_INTERVAL) {
// Reset the frame counter */
FrameCount = 0;
// Check the data to be sent through IN pipe */
Handle_USBAsynchXfer(pdev);
}
return USBD_OK;
}
/**
* @brief Handle_USBAsynchXfer
* Send data to USB
* @param pdev: instance
* @retval None
*/
static void Handle_USBAsynchXfer (void *pdev)
{
uint16_t USB_Tx_ptr;
uint16_t USB_Tx_length;
if(USB_Tx_State != 1)
{
if (APP_Rx_ptr_out == APP_RX_DATA_SIZE)
{
APP_Rx_ptr_out = 0;
}
if(APP_Rx_ptr_out == APP_Rx_ptr_in)
{
USB_Tx_State = 0;
return;
}
if(APP_Rx_ptr_out > APP_Rx_ptr_in) // rollback */
{
APP_Rx_length = APP_RX_DATA_SIZE - APP_Rx_ptr_out;
}
else
{
APP_Rx_length = APP_Rx_ptr_in - APP_Rx_ptr_out;
}
#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
APP_Rx_length &= ~0x03;
#endif // USB_OTG_HS_INTERNAL_DMA_ENABLED */
if (APP_Rx_length > CDC_DATA_IN_PACKET_SIZE)
{
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = CDC_DATA_IN_PACKET_SIZE;
APP_Rx_ptr_out += CDC_DATA_IN_PACKET_SIZE;
APP_Rx_length -= CDC_DATA_IN_PACKET_SIZE;
}
else
{
USB_Tx_ptr = APP_Rx_ptr_out;
USB_Tx_length = APP_Rx_length;
APP_Rx_ptr_out += APP_Rx_length;
APP_Rx_length = 0;
}
USB_Tx_State = 1;
DCD_EP_Tx (pdev,
CDC_IN_EP,
(uint8_t*)&APP_Rx_Buffer[USB_Tx_ptr],
USB_Tx_length);
}
}
/**
* @brief usbd_pyb_GetCfgDesc
* Return configuration descriptor
* @param speed : current device speed
* @param length : pointer data length
* @retval pointer to descriptor buffer
*/
static uint8_t *usbd_pyb_GetCfgDesc(uint8_t speed, uint16_t *length) {
*length = sizeof(usbd_pyb_CfgDesc);
return usbd_pyb_CfgDesc;
}
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