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Actually minimal version of rp2040 scanvideo
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| /* | |
| * Actually minimal scanvideo example | |
| */ | |
| #include <stdio.h> | |
| #include "pico.h" | |
| #include "pico/scanvideo.h" | |
| #include "pico/scanvideo/composable_scanline.h" | |
| #include "pico/stdlib.h" | |
| // Highest possible VGA_MODE with RAW_RUN seems to be 320x240_60 | |
| #define VGA_MODE vga_mode_320x240_60 | |
| extern const struct scanvideo_pio_program video_24mhz_composable; | |
| #define ALIGNED_SCANLINE_WORDS 0 | |
| static void render_scanline(struct scanvideo_scanline_buffer *dest) { | |
| uint32_t *buf = dest->data; | |
| uint16_t *output = (uint16_t*)buf; | |
| int l = scanvideo_scanline_number(dest->scanline_id); | |
| *output++ = COMPOSABLE_RAW_RUN; | |
| // First color byte in RAW_RUN comes before run length | |
| *output++ = l & 2 ? 0xffff : 0x0000; | |
| *output++ = VGA_MODE.width; | |
| *output++ = l & 2 ? 0x0000 : 0xffff; | |
| for (int i = 2; i < VGA_MODE.width; i+=2) { | |
| *output++ = l & 2 ? 0xffff : 0x0000; | |
| *output++ = l & 2 ? 0x0000 : 0xffff; | |
| } | |
| // Must end with black pixel | |
| *output++ = COMPOSABLE_RAW_1P; | |
| *output++ = 0; | |
| if (ALIGNED_SCANLINE_WORDS) { | |
| *output++ = COMPOSABLE_EOL_ALIGN; | |
| } else { | |
| *output++ = COMPOSABLE_EOL_SKIP_ALIGN; | |
| *output++ = 0xffff; | |
| } | |
| dest->data_used = (uint16_t)(((uint32_t*)output) - buf); | |
| dest->status = SCANLINE_OK; | |
| } | |
| // static void frame_update_logic() {} | |
| int vga_main(void) { | |
| scanvideo_setup(&VGA_MODE); | |
| scanvideo_timing_enable(true); | |
| while (true) { | |
| struct scanvideo_scanline_buffer *scanline_buffer = scanvideo_begin_scanline_generation(true); | |
| // frame_update_logic(); | |
| render_scanline(scanline_buffer); | |
| scanvideo_end_scanline_generation(scanline_buffer); | |
| } | |
| return 0; | |
| } | |
| int main(void) { | |
| setup_default_uart(); | |
| return vga_main(); | |
| } |
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