用STM32CubeMX设置"mode"为Device_Only,"class for FS IP"为Communication Device class.
生成代码只在几个地方修改一点代码,自己写的不超过50行代码,PC就可以识别为串口了。
1.Heap Size 要加大。
2.usbd_cdc_if.c 中要加上:
1)
USBD_CDC_LineCodingTypeDef LineCoding;
2)
#define APP_RX_DATA_SIZE 64
#define APP_TX_DATA_SIZE 64
3)
case CDC_SET_LINE_CODING:
LineCoding.bitrate = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |
(pbuf[2] << 16) | (pbuf[3] << 24));
LineCoding.format = pbuf[4];
LineCoding.paritytype = pbuf[5];
LineCoding.datatype = pbuf[6];
break;
case CDC_GET_LINE_CODING:
pbuf[0] = (uint8_t)(LineCoding.bitrate);
pbuf[1] = (uint8_t)(LineCoding.bitrate >> 8);
pbuf[2] = (uint8_t)(LineCoding.bitrate >> 16);
pbuf[3] = (uint8_t)(LineCoding.bitrate >> 24);
pbuf[4] = LineCoding.format;
pbuf[5] = LineCoding.paritytype;
pbuf[6] = LineCoding.datatype;
break;
4)
static int8_t CDC_Receive_FS (uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
memcpy(UserTxBufferFS,Buf,*Len);
CDC_Transmit_FS(UserTxBufferFS,*Len);
USBD_CDC_ReceivePacket(hUsbDevice_0);
return (USBD_OK);
/* USER CODE END 6 */
}
3. stmcdc.inf文件
;
; STMicroelectronics Comunication Device Class driver instalation file
; (C)2006 Copyright STMicroelectronics
;
[Version]
Signature="$Windows NT$"
Class=Ports
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
Provider=%STM%
LayoutFile=layout.inf
DriverVer=10/02/06
[Manufacturer]
%STM%=DeviceList
[DestinationDirs]
DefaultDestDir=12
[SourceDisksFiles]
[SourceDisksNames]
[DeviceList]
%DESCRIPTION%=STMUSB, USBVID_0483&PID_5740
;------------------------------------------------------------------------------
; Windows 2000/XP Sections
;------------------------------------------------------------------------------
[STMUSB.nt]
include=mdmcpq.inf
CopyFiles=DriverCopyFiles
AddReg=STMUSB.nt.AddReg
[DriverCopyFiles]
usbser.sys,,,0x20
[STMUSB.nt.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,usbser.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
[STMUSB.nt.Services]
AddService=usbser, 0x00000002, DriverService
[STMUSB.nt.HW]
include=mdmcpq.inf
[DriverService]
DisplayName=%DESCRIPTION%
ServiceType=1
StartType=3
ErrorControl=1
ServiceBinary=%12%usbser.sys
;------------------------------------------------------------------------------
; String Definitions
;------------------------------------------------------------------------------
[Strings]
STM="STMicroelectronics"
DESCRIPTION="STM32 Virtual COM Port"
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