ui: introduce double buffering #1595
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NickeZ
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src/ui/canvas.c
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| void canvas_commit(void) | ||
| { | ||
| _canvas_active = (_canvas_active + 1) % 2; |
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DeepSeek
Potential Race Conditions:
- The volatile
_canvas_activeswitch isn't atomic. On 32-bit MCUs, this could cause torn buffer states if interrupted during update. Consider using atomic operations or disabling interrupts briefly duringcanvas_commit().
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deepseek can fight gemini
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Well, you are not just writing the value, you are reading it too.
| /* | ||
| * Initialize canvases | ||
| */ | ||
| void canvas_init(void); |
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DeepSeek:
Buffer Initialization:
canvas_init()is declared in canvas.h but not implemented.
src/ui/canvas.c
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| // Copyright 2025 Shift Cryptosecurity AG | |||
src/ui/canvas.c
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| #include <string.h> | ||
| #include <ui/canvas.h> | ||
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| // This is sometimes updated from interrupts :( to be undone eventually |
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If you know what "sometimes" means exactly, please specify for clarity. BIP39 unlock? More?
"to be undone" you mean the volatile qualifier right?
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yup, volatile can be removed when we simplify all interrupts to just set flags.
src/ui/canvas.h
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| // Copyright 2025 Shift Cryptosecurity AG | |||
test/hardware-fakes/src/fake_oled.c
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| // Copyright 2025 Shift Cryptosecurity AG | |||
I guess I could return a dirty buffer and keep all the clears instead. I have no strong opinion, just thought it would be nicer like this. (if you didn't commit/switch the buffers the current buffer will never be drawn, so I guess it would be hard to miss?) |
NickeZ
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Create a new module called "canvas" which is responsible for double buffering. Double buffering is required to enable asynchronous transfer of the frame buffer. While the "active" frame buffer is being transferred to the oled in the background, the ui will render to a "working" frame buffer. When the rendering is complete the buffers are flipped with "canvas_commit".
NickeZ
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Create a new module called "canvas" which is responsible for double buffering. Double buffering is required to enable asynchronous transfer of the frame buffer. While the "active" frame buffer is being transferred to the oled in the background, the ui will render to a "working" frame buffer. When the rendering is complete the buffers are flipped with "canvas_commit".
I tested with both ssd1312 and sh1107 screens.