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8.1 Code Assembler
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What constitutes a program for the AVR controller Well, the contents of the program memory is the program for the AVR controller. Each memory location in the program memory
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186 AVR SYSTEM DEVELOPMENT TOOLS
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map of the AVR controller is a 16-bit word. This 16-bit word constitutes the op-code and the (optional) operand. The controller reads the program memory and interprets the binary word. For human convenience, rather than handle the op-codes, you can use the mnemonic representation of the op-codes (e.g., CLI, Clear Global Interrupt flag, is a mnemonic representation of the op-code: $94F0). However, the controller understands the op-code and not the mnemonic, and so you need a translation program that takes the mnemonic codes and translates these codes into op-codes. The program that does this job is called an assembler. An assembler takes a text file called the source file, with the mnemonic representation of the program (simply called the source code) and converts it into another file with the machine op-codes (simply called the machine code or object code).
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One of the assemblers available for AVR controllers is from Atmel. It is called avrasm and can be downloaded from the atmel site. The assembler covers the entire range of AVR controllers (Figure 8.1). The assembler takes an assembler source code file and translates it into an object code file. The object code can be used as an input to a simulator or an emulator. The assembler also generates a file containing the code that can be programmed into the chip by a suitable programmer. The avrasm is a very simple assembler and takes only a single input assembler code file. It is not possible to link other object code files using the avrasm. The avrasm can also generate an EEPROM file if EEPROM data has been allocated in the assembler source file.
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FIGURE 8.1 Windows version of the AVR Assembler.
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The avrasm has the following syntax.
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AVRASM: AVR macro assembler version 1.21 (Mar 5 1998 01:21:00) Copyright (C) 1995-1997 ATMEL Corporation usage: avrasm [-m -i -g] [-w] <infile> <lisfile> <romfile> -m Output Motorola S-record format -i Output Intel HEX format (default) -g Output Generic format -w Relative jumps are allowed to wrap for program ROM up to 4k words in size
The avrasm runs as an MS-DOS command line version. There is also a windows version available for Windows 3.11, Windows 95, or Windows NT. The windows version of the avrasm is wavrasm, and this has online help. However, the wavrasm cannot assemble very large source files.
IAR ASSEMBLER
IAR assembler is a shareware product from IAR (www.iar.com). This is a very high quality assembler with sophisticated features. The IAR assembler can be downloaded either from the atmel Web site or the IAR site (ftp://ftp.iar.se/pub/mirror/aa90.exe). IAR assembler allows assembling of multiple files, as well as linking object code. The IAR assembler is fast and has a C preprocessor front end.
8.2 Code Simulator
Now once you have the object file, you can transfer the op-codes into the AVR controller, and if you have written a program exactly according to the system design, it may work correctly. However, there are good chances that your program does not work as expected. In such a case, you will need to find out where the errors are and make suitable changes or additions to the source file, assemble the source file again, and load the machine code into the controller. This may be a time-consuming, iterative process. Rather than transferring the op-codes into the controller and debugging the code, it is possible to simulate the working of the AVR controller on the development PC itself without downloading the machine code into the controller. A program that simulates or mimics the AVR controller is called a simulator. A simulator can execute the program code, one code at a time, displaying the result on the screen (contents of registers, ports, status, etc.), and this can help ensure that the program works as expected.
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