abstract.txt

at91sam7s64的HelloWorld示例代码。~

This is a WinARM-Demo based on the Keil "Hello" example  

done by Martin Thomas, Kaiserslautern, Germany
<[e-mail]>
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects

Feedback and suggestions welcome.

Have fun.
Martin


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2. Dec. 2005

- modified makefile to output ".bin"-file when FORMAT is
  set to binary. Useful for SAM-BA
- changes in linker-skript for RAM (AT91SAM7S64-RAM.ld)
  and startup-code (startup_SAM7S.S) for RAM-target.
  Useful for debugging. Only tested with Keil uVision3 Demo (not gdb).
- minor cleanup of code by adding header-files to avoid extern

TODO: 
- UART PDC-Mode
- Test with SAM-BA
- Test with gdb/ocd-remote/wiggler


1. Nov. 2005

- compiler: arm-elf-gcc, libc: newlib (as in WinARM)
- modified startup-code and linker-skript for arm-elf-gcc / WinARM
- modified and extended the UART functions (still just "polled" mode)
- adapted interrupt handling to gcc, includes some "workarounds" for thumb
- added syscalls (for newlib's stdio/(i)printf)
- added "ramfunc-style" for gcc (so i.e. ISRs can be placed in RAM - see board.h)
- thumb/thumb-interwork supported
- supports remapping of exception vectors to RAM
- enabled "Reset-Button" on Eval. Board
- added simple "key-echo" in main.c

Tested with arm-elf-gcc 4.0.1 newlib 1.13.0 from WinARM 8/2005.


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Original Text from Keil:


The Hello project is a demo program for the AT91SAM7S64
using Atmel AT91SAM7S Microcontroller Board.

It prints "Hello World" to the serial port and blinks
LEDs according to the push buttons on the board:
 - pressing SW1 prints "Hello World" and blinks LED1
 - holding down SW2 holds the main program 
   (except LED4 blinking) and lights LED2
 - pressing SW3 turns on LED3
 - pressing SW4 turns off LED3
 - LED4 blinks at 1Hz rate

The example shows:
 - how to setup the Vectored Interrupt Controller (VIC)
 - how to setup Interrupt Priority and Interrupt nesting
 - how to setup Periodic Interval Timer (PIT)
 - how to use the UART Interface
 - how to use the Parallel I/O (PIO) Controller

The Hello program is available in different targets:
  Simulator:       configured for software Simulator
  AT91SAM7S Flash: configured for on-chip Flash ROM
                   (used for production or target debugging)
  AT91SAM7S FRIRQ: configured for on-chip Flash ROM with
                   Fast IRQ functions located in on-chip RAM
                   (used for production or target debugging)
  AT91SAM7S RAM:   configured to run from on-chip RAM
                   (may be used for target debugging)