kopia lustrzana https://github.com/Wren6991/PicoDVI
81 wiersze
2.5 KiB
C
81 wiersze
2.5 KiB
C
#ifndef _DVI_H
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#define _DVI_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define N_TMDS_LANES 3
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#define TMDS_SYNC_LANE 0 // blue!
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#include "pico/util/queue.h"
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#include "dvi_config_defs.h"
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#include "dvi_timing.h"
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#include "dvi_serialiser.h"
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#include "util_queue_u32_inline.h"
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typedef void (*dvi_callback_t)(void);
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struct dvi_inst {
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// Config ---
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const struct dvi_timing *timing;
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struct dvi_lane_dma_cfg dma_cfg[N_TMDS_LANES];
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struct dvi_timing_state timing_state;
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struct dvi_serialiser_cfg ser_cfg;
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// Called in the DMA IRQ once per scanline -- careful with the run time!
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dvi_callback_t scanline_callback;
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// State ---
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struct dvi_scanline_dma_list dma_list_vblank_sync;
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struct dvi_scanline_dma_list dma_list_vblank_nosync;
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struct dvi_scanline_dma_list dma_list_active;
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struct dvi_scanline_dma_list dma_list_error;
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// After a TMDS buffer has been enqueue via a control block for the last
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// time, two IRQs must go by before freeing. The first indicates the control
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// block for this buf has been loaded, and the second occurs some time after
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// the actual data DMA transfer has completed.
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uint32_t *tmds_buf_release_next;
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uint32_t *tmds_buf_release;
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// Remember how far behind the source is on TMDS scanlines, so we can output
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// solid colour until they catch up (rather than dying spectacularly)
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uint late_scanline_ctr;
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// Encoded scanlines:
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queue_t q_tmds_valid;
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queue_t q_tmds_free;
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// Either scanline buffers or frame buffers:
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queue_t q_colour_valid;
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queue_t q_colour_free;
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};
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// Set up data structures and hardware for DVI.
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void dvi_init(struct dvi_inst *inst, uint spinlock_tmds_queue, uint spinlock_colour_queue);
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// Call this after calling dvi_init(). DVI DMA interrupts will be routed to
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// whichever core called this function. Registers an exclusive IRQ handler.
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void dvi_register_irqs_this_core(struct dvi_inst *inst, uint irq_num);
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// Start actually wiggling TMDS pairs. Call this once you have initialised the
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// DVI, have registered the IRQs, and are producing rendered scanlines.
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void dvi_start(struct dvi_inst *inst);
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// TMDS encode worker function: core enters and doesn't leave, but still
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// responds to IRQs. Repeatedly pop a scanline buffer from q_colour_valid,
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// TMDS encode it, and pass it to the tmds valid queue.
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void dvi_scanbuf_main_8bpp(struct dvi_inst *inst);
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void dvi_scanbuf_main_16bpp(struct dvi_inst *inst);
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// Same as above, but each q_colour_valid entry is a framebuffer
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void dvi_framebuf_main_8bpp(struct dvi_inst *inst);
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void dvi_framebuf_main_16bpp(struct dvi_inst *inst);
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#ifdef __cplusplus
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}
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#endif
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#endif
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