code.nes/basics/flicker.s, branch mainHacking the Famicom/NES just for the fun of it.
https://git.mssola.com/nes/code.nes/atom?h=main2025-03-20T17:01:34ZClear VBlank on reset on all examples2025-03-20T17:01:34ZMiquel Sabaté Solàmikisabate@gmail.com2025-03-20T17:01:34Zurn:sha1:b21e3d2588749568c777a84435905bef110f3479
This was an oversight from the very first example that has propagated
into the other ones.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
shared: Bring joypad into a proper style2025-03-11T16:00:47ZMiquel Sabaté Solàmikisabate@gmail.com2025-03-11T16:00:47Zurn:sha1:428c301a80641361f51af8102628b545cf9ae63e
Put functions inside of the scope, avoid useless fallthroughs and be
more realistic on what is needed from elsewhere.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Bring code style to better standards2025-03-10T21:52:15ZMiquel Sabaté Solàmikisabate@gmail.com2025-03-10T21:52:15Zurn:sha1:1a74e6a1856673072a61abd0861759901bc2d939
Be more careful on everything and try to follow along style.nes from my
repository. This might change in the future, but it's in a much better
state now.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
shared: Add utilities for clearing screens2025-03-07T15:07:04ZMiquel Sabaté Solàmikisabate@gmail.com2025-03-07T15:04:42Zurn:sha1:ff22231f8a2f3714df701fd7c12b07915adc15e9
These are quite mindless, but they are rather useful on simple examples
in which we don't care about performance and we just want to show
something on the screen.
For now this didn't matter much, but on real hardware I was able to
reproduce the same glitches as with emulators which randomized memory on
both the CPU memory and on the PPU. Hence, just allow some examples to
manually reset these regions and avoid silly graphical glitches.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Ensure background/sprite tiles are spread properly2025-02-04T21:00:36ZMiquel Sabaté Solàmikisabate@gmail.com2025-02-04T14:46:54Zurn:sha1:3e7549c71f60ee1c4b49a7c09fde3b6017818089
At least on the MMC3 chip, it's important to have background tiles on
the first pattern table and then sprite tiles on the second pattern
table. This avoids a hardware bug on scanline IRQs.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Use custom configurations everywhere2025-02-04T21:00:02ZMiquel Sabaté Solàmikisabate@gmail.com2025-01-23T12:57:45Zurn:sha1:0aefffacb5cb08202f7ba53b6e3b9a7303b1d66e
Moreover, I have introduced a linker configuration for MMC1 as well, so
to properly implement the `basics/persist.s` example.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Vastly improve the documentation2025-02-04T20:12:11ZMiquel Sabaté Solàmsabate@suse.com2024-04-16T20:46:31Zurn:sha1:4cfc79f145b7c620a2688f4a755d5e53c7ef0e9d
This includes more clear explanations, images, etc.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Add a way to safely read from controllers2025-02-04T20:04:36ZMiquel Sabaté Solàmsabate@suse.com2024-04-02T21:49:52Zurn:sha1:3c6a583190b827c0e88e535d486a4f191ee255c0
First of all, move some reading utilities into the new `shared`
directory, so controllers can be read by more than one example. Second,
even if we keep the example on `basics/input.s` simple, let's provide a
safe alternative for the other examples.
Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>
basics: Add a flickering example2025-02-04T20:04:01ZMiquel Sabaté Solàmsabate@suse.com2024-04-02T20:02:59Zurn:sha1:1d1f08646352df00977a88adb99e04d54e4dfd5d
Add an example on how to flicker sprites so to not surpass the scanline
limit for them.
Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>
basics: Add an example on CHR-RAM2025-02-04T20:03:23ZMiquel Sabaté Solàmsabate@suse.com2024-03-30T21:54:52Zurn:sha1:6913995597651172b88301776a9e3a66a7c68117
Moreover, add a simple fix to the CI.
Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>