我目前正在尝试为 pic32MZ2048EFH100 编写代码，该代码通过 USB CDC 驱动程序和谐地接收和响应来自 PC 上的自定义程序的消息。
目前，图片能够发送和接收消息。但是，每当它向 PC 发送消息时，它总是错误地引发缓冲区 80% 满标志 (EV_RX80FULL)。除此之外，PIC32 发送消息的速度相对较慢。我正在从工作正常的 TERN 板上移植固件。有时 PC 会非常快速地发送两条消息，TERN 会发送一条确认消息，接收下一条消息，然后确认该消息。另一方面，PIC 将接收两者，然后发出两个确认，这将导致 PC 端的程序出现问题。
两个板之间最大的区别是驱动程序不同，这是我们认为问题的根源。PIC 使用 Microchip 的驱动程序，.inf 如下
;---------------------------------------------------------------------------------
;Note: When the driver package is signed, any modifications to this .inf file will
;break the signature, and the driver package will need to be re-signed.
;---------------------------------------------------------------------------------
; Modified Windows USB CDC Abstract Control Model Serial Driver Setup File
; Copyright (C) 2012 Microchip Technology Inc.
[Version]
Signature="$Windows NT$"
Class=Ports
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
Provider=%MFGNAME%
CatalogFile=%MFGFILENAME%.cat
DriverVer=10/06/2014,5.1.2600.9
[Manufacturer]
%MFGNAME%=DeviceList,NTamd64
;------------------------------------------------------------------------------
; Vendor and Product ID Definitions
;------------------------------------------------------------------------------
; When developing your USB device, the VID and PID used in the PC side
; application program and the firmware on the microcontroller must match.
; The VID and PID can be changed in the USB device descriptor and on the below
; lines in this file. If you modify this .inf file to customize it for your
; device, please remove all existing Microchip (VID 0x04D8) entries from
; the device lists.
;------------------------------------------------------------------------------
[DeviceList]
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_000A
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0205
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0206
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_00DF&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0057&MI_01
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_006E&MI_01
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0208&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0208&MI_02
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_00DD&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0207&MI_00
[DeviceList.NTamd64]
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_000A
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0205
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0206
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_00DF&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0057&MI_01
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_006E&MI_01
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0208&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0208&MI_02
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_00DD&MI_00
%DESCRIPTION%=DriverInstall,USB\VID_04D8&PID_0207&MI_00
;------------------------------------------------------------------------------
; Windows 32bit OSes Section
;------------------------------------------------------------------------------
[DriverInstall.nt]
include=mdmcpq.inf
CopyFiles=FakeModemCopyFileSection
AddReg=DriverInstall.nt.AddReg
[DriverInstall.nt.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,%DRIVERFILENAME%.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
[DriverInstall.NT.Services]
include=mdmcpq.inf
AddService=usbser, 0x00000002, LowerFilter_Service_Inst
;------------------------------------------------------------------------------
; Windows 64bit OSes Section
;------------------------------------------------------------------------------
[DriverInstall.NTamd64]
include=mdmcpq.inf
CopyFiles=FakeModemCopyFileSection
AddReg=DriverInstall.NTamd64.AddReg
[DriverInstall.NTamd64.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,%DRIVERFILENAME%.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
[DriverInstall.NTamd64.Services]
include=mdmcpq.inf
AddService=usbser, 0x00000002, LowerFilter_Service_Inst
;------------------------------------------------------------------------------
; Common Sections
;------------------------------------------------------------------------------
[DestinationDirs]
DefaultDestDir=12
[SourceDisksNames]
[SourceDisksFiles]
[FakeModemCopyFileSection]
[LowerFilter_Service_Inst]
DisplayName= %SERVICE%
ServiceType= 1
StartType = 3
ErrorControl = 0
ServiceBinary = %12%\usbser.sys
;------------------------------------------------------------------------------
; String Definitions
;------------------------------------------------------------------------------
; These strings can be modified to customize your device
;------------------------------------------------------------------------------
[Strings]
MFGFILENAME="mchpcdc"
DRIVERFILENAME ="usbser"
MFGNAME="Microchip Technology, Inc." ;This name shows up in the device manager properties for the device
DESCRIPTION="USB Serial Port" ;This is the "friendly name" that shows up in the device manager
SERVICE="USB to Serial Driver"
这是PIC上的USB配置：
/**************************************************
* USB Device Function Driver Init Data
**************************************************/
const USB_DEVICE_CDC_INIT cdcInit0 =
{
.queueSizeRead = 1,
.queueSizeWrite = 1,
.queueSizeSerialStateNotification = 1
};
/**************************************************
* USB Device Layer Function Driver Registration
* Table
**************************************************/
const USB_DEVICE_FUNCTION_REGISTRATION_TABLE funcRegistrationTable[1] =
{
/* Function 1 */
{
.configurationValue = 1, /* Configuration value */
.interfaceNumber = 0, /* First interfaceNumber of this function */
.speed = USB_SPEED_HIGH|USB_SPEED_FULL, /* Function Speed */
.numberOfInterfaces = 2, /* Number of interfaces */
.funcDriverIndex = 0, /* Index of CDC Function Driver */
.driver = (void*)USB_DEVICE_CDC_FUNCTION_DRIVER, /* USB CDC function data exposed to device layer */
.funcDriverInit = (void*)&cdcInit0 /* Function driver init data */
},
};
/*******************************************
* USB Device Layer Descriptors
*******************************************/
/*******************************************
* USB Device Descriptor
*******************************************/
const USB_DEVICE_DESCRIPTOR deviceDescriptor =
{
0x12, // Size of this descriptor in bytes
USB_DESCRIPTOR_DEVICE, // DEVICE descriptor type
0x0200, // USB Spec Release Number in BCD format
USB_CDC_CLASS_CODE, // Class Code
USB_CDC_SUBCLASS_CODE, // Subclass code
0x00, // Protocol code
USB_DEVICE_EP0_BUFFER_SIZE, // Max packet size for EP0, see system_config.h
0x04D8, // Vendor ID
0x000A, // Product ID
0x0100, // Device release number in BCD format
0x01, // Manufacturer string index
0x02, // Product string index
0x00, // Device serial number string index
0x01 // Number of possible configurations
};
/*******************************************
* USB Device Qualifier Descriptor for this
* demo.
*******************************************/
const USB_DEVICE_QUALIFIER deviceQualifierDescriptor1 =
{
0x0A, // Size of this descriptor in bytes
USB_DESCRIPTOR_DEVICE_QUALIFIER, // Device Qualifier Type
0x0200, // USB Specification Release number
USB_CDC_CLASS_CODE, // Class Code
USB_CDC_SUBCLASS_CODE, // Subclass code
0x00, // Protocol code
USB_DEVICE_EP0_BUFFER_SIZE, // Maximum packet size for endpoint 0
0x01, // Number of possible configurations
0x00 // Reserved for future use.
};
/*******************************************
* USB High Speed Configuration Descriptor
*******************************************/
const uint8_t highSpeedConfigurationDescriptor[]=
{
/* Configuration Descriptor */
0x09, // Size of this descriptor in bytes
USB_DESCRIPTOR_CONFIGURATION, // Descriptor Type
67,0, //(67 Bytes)Size of the Config descriptor.e
2, // Number of interfaces in this cfg
0x01, // Index value of this configuration
0x00, // Configuration string index
USB_ATTRIBUTE_DEFAULT | USB_ATTRIBUTE_SELF_POWERED, // Attributes
50, // Max power consumption (2X mA)
/* Descriptor for Function 1 - CDC */
/* Interface Descriptor */
0x09, // Size of this descriptor in bytes
USB_DESCRIPTOR_INTERFACE, // Descriptor Type
0, // Interface Number
0x00, // Alternate Setting Number
0x01, // Number of endpoints in this interface
USB_CDC_COMMUNICATIONS_INTERFACE_CLASS_CODE, // Class code
USB_CDC_SUBCLASS_ABSTRACT_CONTROL_MODEL, // Subclass code
USB_CDC_PROTOCOL_AT_V250, // Protocol code
0x00, // Interface string index
/* CDC Class-Specific Descriptors */
sizeof(USB_CDC_HEADER_FUNCTIONAL_DESCRIPTOR), // Size of the descriptor
USB_CDC_DESC_CS_INTERFACE, // CS_INTERFACE
USB_CDC_FUNCTIONAL_HEADER, // Type of functional descriptor
0x20,0x01, // CDC spec version
sizeof(USB_CDC_ACM_FUNCTIONAL_DESCRIPTOR), // Size of the descriptor
USB_CDC_DESC_CS_INTERFACE, // CS_INTERFACE
USB_CDC_FUNCTIONAL_ABSTRACT_CONTROL_MANAGEMENT, // Type of functional descriptor
USB_CDC_ACM_SUPPORT_LINE_CODING_LINE_STATE_AND_NOTIFICATION,// bmCapabilities of ACM
sizeof(USB_CDC_UNION_FUNCTIONAL_DESCRIPTOR_HEADER) + 1, // Size of the descriptor
USB_CDC_DESC_CS_INTERFACE, // CS_INTERFACE
USB_CDC_FUNCTIONAL_UNION, // Type of functional descriptor
0, // com interface number
1,
sizeof(USB_CDC_CALL_MANAGEMENT_DESCRIPTOR), // Size of the descriptor
USB_CDC_DESC_CS_INTERFACE, // CS_INTERFACE
USB_CDC_FUNCTIONAL_CALL_MANAGEMENT, // Type of functional descriptor
0x00, // bmCapabilities of CallManagement
1, // Data interface number
/* Interrupt Endpoint (IN)Descriptor */
0x07, // Size of this descriptor
USB_DESCRIPTOR_ENDPOINT, // Endpoint Descriptor
1| USB_EP_DIRECTION_IN, // EndpointAddress ( EP1 IN INTERRUPT)
USB_TRANSFER_TYPE_INTERRUPT, // Attributes type of EP (INTERRUPT)
0x10,0x00, // Max packet size of this EP
0x02, // Interval (in ms)
/* Interface Descriptor */
0x09, // Size of this descriptor in bytes
USB_DESCRIPTOR_INTERFACE, // INTERFACE descriptor type
1, // Interface Number
0x00, // Alternate Setting Number
0x02, // Number of endpoints in this interface
USB_CDC_DATA_INTERFACE_CLASS_CODE, // Class code
0x00, // Subclass code
USB_CDC_PROTOCOL_NO_CLASS_SPECIFIC, // Protocol code
0x00, // Interface string index
/* Bulk Endpoint (OUT)Descriptor */
0x07, // Size of this descriptor
USB_DESCRIPTOR_ENDPOINT, // Endpoint Descriptor
2|USB_EP_DIRECTION_OUT, // EndpointAddress ( EP2 OUT)
USB_TRANSFER_TYPE_BULK, // Attributes type of EP (BULK)
0x00, 0x02, // Max packet size of this EP
0x00, // Interval (in ms)
/* Bulk Endpoint (IN)Descriptor */
0x07, // Size of this descriptor
USB_DESCRIPTOR_ENDPOINT, // Endpoint Descriptor
2|USB_EP_DIRECTION_IN, // EndpointAddress ( EP2 IN )
0x02, // Attributes type of EP (BULK)
0x00, 0x02, // Max packet size of this EP
0x00, // Interval (in ms)
};
/******************************************************
* USB Driver Initialization
******************************************************/
const DRV_USBHS_INIT drvUSBInit =
{
/* Interrupt Source for USB module */
.interruptSource = INT_SOURCE_USB_1,
/* Interrupt Source for USB module */
.interruptSourceUSBDma = INT_SOURCE_USB_1_DMA,
/* System module initialization */
.moduleInit = {SYS_MODULE_POWER_RUN_FULL},
.operationMode = DRV_USBHS_OPMODE_DEVICE,
.operationSpeed = USB_SPEED_HIGH,
/* Stop in idle */
.stopInIdle = false,
/* Suspend in sleep */
.suspendInSleep = false,
/* Identifies peripheral (PLIB-level) ID */
.usbID = 0,
};