80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
#ifndef _GRAY_H
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#define _GRAY_H 1
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//---
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// Public API.
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//---
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/*
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gray_start()
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Starts the gray engine. The control of the screen is transferred to the
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gray engine.
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*/
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void gray_start(void);
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/*
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gray_stop()
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Stops the gray engine. The monochrome display system takes control of
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the video ram.
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*/
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void gray_stop(void);
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/*
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gray_lightVRAM()
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Returns the module's gray vram address.
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*/
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void *gray_lightVRAM(void);
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/*
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gray_lightVRAM()
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Returns the module's dark vram address.
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*/
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void *gray_darkVRAM(void);
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/*
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gray_getDelays()
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Returns the gray engine delays.
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@arg light Will be set if non-NULL.
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@arg dark Will be set if non-NULL.
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*/
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void gray_getDelays(int *light, int *dark);
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/*
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gray_setDelays()
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Changes the gray engine delays. Usually you don't need to call this,
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because the engine has its default values.
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Finding values that give proper grays is quite the hard part of the
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gray engine. Usual values are about 1000, with light being between 75
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and 90% of dark.
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@arg light Light gray duration (the lower).
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@arg dark Dark gray duration (the higher).
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*/
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void gray_setDelays(int light, int dark);
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//---
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// Internal API.
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// Referenced here for documentation purposes only. Do not call.
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//--
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/*
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gray_swap()
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Swaps the vram buffers.
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*/
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void gray_swap(void);
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/*
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gray_interrupt()
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Answers a timer interrupt. Swaps the two buffers.
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*/
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void gray_interrupt(void) __attribute__((section(".gint.int")));
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/*
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gray_init()
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Initializes the gray engine.
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*/
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void gray_init(void) __attribute__((constructor));
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#endif // _GRAY_H
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