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39 PCI-1680U/1682U User Manual
Chapter 4 Software Requirements
4.3.5 WriteFile
Users can use this interface to send data to CAN port which was opened. One or
more frames can be selected each time.
Syntax
BOOL WriteFile(
HANDLE hDevice,
LPCVOID lpBuffer,
DWORD nNumberOfFramesToWrite,
LPDWORD lpNumberOfFramesWritten,
LPOVERLAPPED lpOverlapped
);
Parameters
Return Value
It will be considered successful if non-zero values are returned in the following situa-
tions:
Driver send all the requested data.
Timeout occur when driver only send part of the data or no data.
It will be considered unsuccessful if zero values are returned in the following situa-
tions. Please call GetLastError.
If user cancel the operation or reset chip while drivers are sending data, GetLastEr-
ror will be called to return ERROR_OPERATION_ABORTED.
If busoff of device is discovered before drivers send any frames, GetLastError will be
called to return ERROR_GEN_FAILURE.
If drivers cannot allocate resources according to the number defined by the third
parameter frame, GetLastError will be called to return
ERROR_INVALID_PARAMETER.
Note! The third and fourth parameters of WriteFile are defined as byte length
in MSDN, but stand for the number of frames here.
Name Direction Description
hDevice Input Handle of the device which was opened.
lpBuffer Input Start address of send buffer.
nNmberOf-
FramesToWrite
Input
Number of frames to be sent to drivers. The definition here
is different from that in MSDN.
lpNumberOf-
FramesWritten
Output
Real number of frames sent to driver. The definition here
is different from that in MSDN.
lpOverlapped Input
If CreateFile uses asynchronous open, asynchronous
operation must be supported here. Please refer to MSDN
for detailed instruction to asynchronous open.
*Note In WINDOWS CE,set to NULL.
- User Manual 1
- PCI-1680U 1
- PCI-1682U 1
- Copyright 2
- Acknowledgements 2
- Product Warranty (2 years) 2
- Declaration of Conformity 3
- Packing List 3
- Contents 5
- Chapter 1 7
- 1.1 Description 8
- 1.2 Features 8
- Chapter 1 Introduction 9
- PCI-1680U/1682U User Manual 4 10
- Chapter 2 11
- PCI-1680U/1682U User Manual 6 12
- Chapter 2 Install WDM driver 13
- 2.1.2 ISA device setup 14
- 2.1.3 Port setup 20
- Chapter 3 23
- 3.1 Initial Inspection 24
- 3.3 Card Installation 27
- Chapter 4 29
- 4.1 Introduction 30
- WDM&CE Driver 30
- Table 4.1: Hardware Support 32
- 4.3 Introduction to API 33
- 4.3.2 CloseHandle 35
- 4.3.3 DeviceIoControl 35
- 4.3.4 ReadFile 42
- 4.3.5 WriteFile 45
- 4.3.6 SetCommMask 47
- 4.3.7 GetCommMask 48
- 4.3.8 WaitCommEvent 48
- 4.3.9 ClearCommError 50
- 4.3.10 GetOverlappedResult 52
- ov.OffsetHigh = 0; 53
- 4.4 Structure List 54
- 4.4.1 canmsg_t 55
- 4.4.2 CanStatusPar_t 56
- 4.4.3 Command_par 57
- 4.5 How to dispose message 60
- 4.5.3 How to send RTR frame 61
- 4.6 Acceptance filtering 63
- 4.7.3.3 Write code 74
- Write code in source file 74
- Driver 80
- 4.7.5.3 Write code 82
- 4.8 Examples 83
- 4.8.1 Interface 84
- 4.8.2 Flow Chart 89
- 4.8.2.2 Receive flow chart 90
- 4.8.2.3 Configure flow chart 91
- 4.8.2.4 Event flow chart 92
- 4.10 CANMonitor 94
- 4.10.1 Function Introduction 95
- Menu Introduction 96
- Filter has CAN Filter setting 98
- Toolbar Introduction 99
- Status Bar Introduction 99
- Chapter 5 101
- 5.1 Pin Assignments 102
- 5.2 Wiring 102
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