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Technical Support
On-Line Manuals
µVision4 User's Guide
About µVision
User Interface
Creating Applications
Utilities
Debugging
Using the Debugger
Simulation
Start Debugging
Application Program Execution
Debug Windows and Dialogs
Breakpoints Window
Call Stack and Locals Window
Code Coverage
Command Window
Disassembly Window
Event Viewer
Execution Profiler
Instruction Trace Window
Logic Analyzer
Setup
Setup in Detail
Restrictions
Using the Logic Analyzer
Memory Map
Memory Window
Performance Analyzer
Registers Window
Serial Window
Symbols Window
System Viewer
Adding System Viewer Windows
Toolbox
Trace Data Window
Trace Navigation
Watch Window
Expressions
Constants
System Variables
Peripheral Variables
I/O Ports
Serial Ports
Program Variables (Symbols)
Fully Qualified Symbols
Non-Qualified Symbols
Literal Symbols
Using Symbols
Line Numbers
Bit Addresses
Type Specifications
Operators
Memory Type Specifiers
Differences Between µVision4 and C
Expression Examples
Cortex-M Code and Data Trace
Trace Features
Tracepoint Expressions
Tracepoint Intrinsics
Tracepoint Limitations
Configuring the Trace Hardware
Tracepoint Marks
Tips and Tricks
Review Peripherals and CPU Configuration
Simulate I/O Ports
Simulate Interrupts and Clock Inputs
Simulate external I/O Devices
Assign Serial I/O to a PC COM Port
Check Illegal Memory Access
Command Input from File
Preset I/O Ports or Memory Contents
Write Debug Output to a File
Keyboard Shortcuts
TPIU Initialization after RESET (Cortex-M)
Debug Commands
Debug Functions
Simulation
Flash Programming
Dialogs
Example Programs
Command Line
Appendix
µVision4 User's Guide
Simulate external I/O Devices
External I/O devices are typical memory mapped. You may simulate such I/O devices with the Memory Window provided in the µVision4 debugger. Since the C user program does not contain any variable declarations for such memory regions it is required that you map this memory with the MAP command:
MAP 0x100000, 0x100FFF READ WRITE /* MAP memory for I/O area */
You may use breakpoints in combination with debug functions to simulate the logic behind the I/O device.
Refer to User Functions for more information.
Example for a breakpoint definition:
BS WRITE 0x100000, 1, "IO_access ()"
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