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Noté. / 5. Basé sur avis des utilisateurs
armasm -g vectors.s
armasm -g -PD "ROM_RAM_REMAP SETL {TRUE}" init.s
armasm -g stack.s
armasm -g heap.s
REM Use the following two lines to build without using the serial port.
armcc -c -g -O1 main.c -DEMBEDDED -DROM_RAM_REMAP
armcc -c -g -O1 retarget.c
REM Use the following two lines to build using the serial port.
REM armcc -c -g -O1 main.c -DEMBEDDED -DROM_RAM_REMAP -DUSE_SERIAL_PORT
REM armcc -c -g -O1 retarget.c -DUSE_SERIAL_PORT
armcc -c -g -O1 uart.c -I..\include
armcc -c -g -O1 serial.c -I..\include
armlink vectors.o init.o main.o retarget.o uart.o serial.o stack.o heap.o
-scatter scat_c.scf -o embed.axf -entry 0x24000000
-info totals -info unused
fromelf embed.axf -bin -o embed.bin
This creates:
• an ELF debug image (embed.axf) for loading into an ARM debugger
• a binary ROM image (embed.bin) suitable for downloading into the RAM or Flash memory of the ARM
development boards.
The readme.txt file contains additional details of how the image can be downloaded to the Flash memory of an
ARM Integrator Board and debugged there.
6.6.5 Additional examples of remapping
The install_directory\Examples\Embedded\ledflash directory contains a simple interrupt-driven LED
flasher that runs on an ARM Integrator board. It uses ROM/RAM remapping and scatter loading.
To build the example, a batch-file (build.bat) and a CodeWarrior IDE project file (ledflash.mcp) are provided.
Full instructions for downloading the code to Flash are available in the directory.
See also Using scatter loading with memory-mapped I/O.
Writing Code for ROM
Copyright ?1999 2001 ARM Limited 6-17
- ARM® Developer Suite 1
- Version 1.2 1
- Developer Guide 1
- About this book 2
- ARM publications 3
- Other publications 3
- Feedback 4
- 1 Introduction 5
- Introduction 6
- 1.3 Developing for the ARM 7
- 1.3.5 Writing Code for ROM 8
- 2.1.1 ATPCS variants 9
- 2.1.2 ARM C libraries 9
- • Read-only memory 10
- 2.2 Register roles and names 11
- 2.3 The stack 12
- 2.4 Parameter passing 14
- 2.5 Stack limit checking 15
- 2.6.2 Writing code for ROPI 17
- 2.7.1 Reentrant routines 18
- 2.9 Floating-point options 20
- 3 Interworking ARM and Thumb 22
- 3.1 About interworking 22
- Interworking ARM and Thumb 23
- 3.2.3 Example ARM header 24
- Building the example 25
- 3.2.4 ARM architecture v5T 25
- 3.2.5 Labels in Thumb code 26
- C interworking example 27
- 5. Type go to run the code 31
- String copying example 33
- Operand expressions 33
- Physical registers 33
- 4.1.4 Usage 35
- 4.1.5 Examples 36
- Dot product 37
- Long multiplies 37
- • LDRB/STRB for char 39
- • LDR/STR for int 39
- C++ calling conventions 42
- C++ data types 42
- Symbol name mangling 43
- 4.4.3 Examples 43
- Calling C from C++ 44
- Calling C++ from C 45
- Handling Processor Exceptions 48
- • the address of the handler 53
- 5.4 SWI handlers 55
- Nested SWIs in C and C++ 57
- 5.5 Interrupt handlers 61
- • Single-channel DMA transfer 63
- • Dual-channel DMA transfer 63
- • Interrupt prioritization 63
- • Context switch 63
- Interrupt prioritization 64
- Context switch 65
- 5.6 Reset handlers 67
- 5.8 Prefetch Abort handler 69
- 5.9 Data Abort handler 70
- • A single extended handler 71
- • Several chained handlers 71
- Handling the exception 72
- 5.11.2 The return address 72
- FIQ and IRQ handlers 73
- Prefetch Abort handlers 73
- Data Abort handlers 73
- 5.12 System mode 75
- 6 Writing Code for ROM 76
- 6.2.1 ROM at 0x0 77
- 6.2.2 RAM at 0x0 77
- Implementing RAM at 0x0 77
- System decoder 78
- 6.3 Initializing the system 79
- 6.4.1 Memory map 81
- 6.4.2 Sample code 82
- • five execution regions: 83
- 6.5.3 Sample code 84
- 6.5.4 Building the example 88
- Using the CodeWarrior IDE 89
- Using the command line 89
- 6.6.1 Memory map 90
- 6.6.3 Initialization code 91
- 6.6.4 Building the example 91
- 6.7.1 Memory map 93
- 6.7.2 Building the example 93
- 6.7.3 Sample code 93
- 6.8.1 Memory map 97
- 6.8.2 Building the example 97
- 6.8.4 Sample code 98
- 6.9.2 Using unions 100
- Using an array of shorts 100
- Using a struct 100
- 6.9.4 Using scatter loading 101
- 6.9.5 Code efficiency 102
- 6.10 Troubleshooting 103
- Writing Code for ROM 104
- Code (or read-only) segments 105
- Data (or read-write) segments 105
- Debug data 105
- 7.1.1 About caches 106
- ARMulator Pagetable model 106
- 7.1.4 Cache performance 107
- 7.3 Memory protection units 109
- 7.4 Configuring a PU 110
- 7.5 Memory management units 113
- 7.6 Configuring an MMU 115
- 7.7 Tightly coupled memory 117
- 7.7.3 ARM966E-S warm reset 118
- Debug Communications Channel 120
- 8.4 Target transfer of data 123
- • Using armsd 125
- • Using AXD 125
- Issuing commands 126
- Using AXD 126
- 8.7 Access from Thumb state 129
- 8.8 Semihosting 130
- Glossary 131
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