MATLAB XPC TARGET 4 - DEVICE DRIVERS Guia do Utilizador descarregar pdf (Página 73)

DMA Considerations

If your board directly accesses system RAM, such as a DMA controller, you

must allocate that memory using the

xpcAllocPhysicalMemory function.

This function allocates the buffer such that the buffer virtual address i s the

same as its physical address.

6-5

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 110 111

Device Drivers 1
508-647-7000 (Phone) 2
508-647-7001 (Fax) 2
The MathWorks, Inc 2
3 Apple Hill Drive 2
Natick, MA 01760-2098 2
Revision History 3
Contents 5
Driver Authoring Tool 7
I/O Structures — By Category 8
I/O Functions — By Category 8
Customizing xPC Target 9
Introduction 10
References 12
Source Code 13
MathWorks Consulting 13
Third-Party Directory 14
Block mask 15
Mask editor 15
Mask initialization (M-file) 15
Before You Star t 16
- I/O port mapped 16
- Memory address mapped 16
- Input and output ports 17
- Mask parameters 17
Register Access 18
Inlining xPC Target Drivers 18
Creating a Custom Driver 19
Creating a C ustom Driver 21
Debugging Notes 24
PCI Drivers 25
PCI Bus Considerations 26
PCI Configuration Space API 27
2 PCI Drivers 28
Sample PCI Device Driver 32
ISA and PC/104 Drivers 33
3 ISA and PC/104 Drivers 34
Memory Mapped 35
Masking Drivers 37
4 Masking Drivers 38
Driver Mask Guidelines 39
Cross-Block Checking 41
When You Are Done 42
Sample Driver Mask 43
Interrupt Support 49
5 Interrupt Support 50
Adding Interrupt Support 55
6 Save and close the file 57
- Async IRQ Source block 59
• your_company_name_boardStop 63
PostHook 64
Argument 66
See Also xpcPCIDevice 66
Custom xPC Target Driver 69
S-Function Guidelines 70
DMA Considerations 73
Passing Parameters 74
Accessing Registers 75
• Structure 76
Creating Custom Drivers 77
Using the xPC T arget 77
Setting Up Driver Variables 80
3 In the M ain tab, enter: 81
Saving the Configuration 83
Reloading the Configuration 84
Creating the C File Template 84
3 Click the Build button 85
I/O Structures — By 87
Category 87
I/O Structures — By Catego ry 88
I/O Structures — 89
Alphabetical List 89
BaseAddress to a virtual 92
VirtAddress field 92
I/O Functions — By 95
Por t I/O 96
PCI Configur 96
Physical Memory 96
Miscellaneous 97
I/O Functions — By C atego ry 98
I/O Functions — 99
Free physical memory 102
Free specified m e mory 102
Arguments 103
XPC_NO_SUB for s ubDeviceId 105
See Also xpcGetPCIDeviceInfo 110

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