106 lines
3.7 KiB
Plaintext
106 lines
3.7 KiB
Plaintext
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These tests are created by Joel Yliluoma.
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The test framework however is created by Shay Green, and is documented below.
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NES Tests Source Code
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---------------------
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Building with ca65
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------------------
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To assemble a test with ca65, use the following commands:
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ca65 -I common -o rom.o source_filename_here.s
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ld65 -C nes.cfg rom.o -o rom.nes
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your_favorite_nes_emulator rom.nes
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Don't bother trying to build a multi-test ROM, since it's not worth the
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complexity. Also, tests you build won't print their name if they fail,
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since that requires special arrangements.
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Framework
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---------
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Each test is in a single source file, and makes use of several library
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source files from common/. This framework provides common services and
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reduces code to only that which performs the actual test. Virtually all
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tests include "shell.inc" at the beginning, which sets things up and
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includes all the appropriate library files.
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The reset handler does minimal NES hardware initialization, clears RAM,
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sets up the text console, then runs main. Main can exit by returning or
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jumping to "exit" with an error code in A. Exit reports the code then
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goes into an infinite loop. If the code is 0, it doesn't do anything,
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otherwise it reports the code. Code 1 is reported as "Failed", and the
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rest as "Error <code>".
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Several routines are available to print values and text to the console.
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Most update a running CRC-32 checksum which can be checked with
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check_crc, allowing ALL the output to be checked very easily. If the
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checksum doesn't match, it is printed, so you can run the code on a NES
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and paste the correct checksum into your code.
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The default is to build an iNES ROM, with other build types that I
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haven't documented (devcart, sub-test of a multi-test ROM, NSF music
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file). My nes.cfg file puts the code at $E000 since my devcart requires
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it, and I don't want the normal ROM to differ in any way from what I've
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tested.
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Library routines are organized by function into several files, each with
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short documentation. Each routine may also optionally list registers
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which are preserved, rather than those which are modified (trashed) as
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is more commonly done. This is because it's best for the caller to
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assume that ALL registers are NOT preserved unless noted.
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Some macros are used to make common operations more convenient. The left
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is equivalent to the right:
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Macro Equivalent
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-------------------------------------
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blt bcc
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bge bcs
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jne label beq skip
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jmp label
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skip:
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etc.
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zp_byte name .zeropage
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name: .res 1
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.code
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zp_res name,n .zeropage
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name: .res n
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.code
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bss_res name,n .bss
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name: .res n
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.code
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for_loop r,b,e,s calls a routine with A set to successive values
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--
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Shay Green <gblargg@gmail.com>
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Some tests might turn the screen off and on, since that affects the
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behavior being tested. This does not indicate failure, and should be
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ignored. Only the test result reported at the end is important.
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The error code at the end is also reported audibly with a series of
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tones, in case the picture isn't visible for some reason. The code is in
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binary, with a low tone indicating 0 and a high tone 1. The first tone
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is always a zero, so you can tell the difference. A code of 0 means
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passed, 1 means failure, and 2 or higher indicates a specific reason as
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listed in the source code by the corresponding set_code line. Examples:
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low = 0 = passed
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low high = 1 = failed
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low high low = 2 = error 2
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low high high = 3 = error 3
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See the source code for more information about a particular test and why
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it might be failing. Each test has comments and correct output at top.
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--
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Shay Green <gblargg@gmail.com>
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