initial

2022-10-30 23:00:53 +01:00
commit 7f087ae854
226 changed files with 27881 additions and 0 deletions
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+/*
+ * Credits to https://github.com/bitluni/ESP32CompositeVideo
+ */
+
+#pragma once
+
+#include "ssd1306_hal/io.h"
+
+#if defined(CONFIG_VGA_AVAILABLE) && defined(CONFIG_VGA_ENABLE) && defined(__XTENSA__)
+
+#include <stdint.h>
+#include "driver/i2s.h"
+
+typedef struct
+{
+  float lineMicros;
+  float syncMicros;
+  float blankEndMicros;
+  float backMicros;
+  float shortVSyncMicros;
+  float overscanLeftMicros;
+  float overscanRightMicros;
+  float syncVolts;
+  float blankVolts;
+  float blackVolts;
+  float whiteVolts;
+  short lines;
+  short linesFirstTop;
+  short linesOverscanTop;
+  short linesOverscanBottom;
+  float imageAspect;
+} TechProperties;
+
+class CompositeOutput
+{
+public:
+
+    enum Mode
+    {
+        PAL,
+        NTSC
+    };
+
+    CompositeOutput(Mode mode, double Vcc = 3.3);
+
+    void init(int xres, int yres, int bpp);
+
+    void fillValues(uint8_t value, int count);
+
+    void sendFrameHalfResolution(const uint8_t *frame);
+
+private:
+    const TechProperties &properties;
+
+    int m_samples_per_line = 0;
+    int samplesSync = 0;
+    int samplesBlank = 0;
+    int samplesBack = 0;
+    int samplesActive = 0;
+    int samplesBlackLeft = 0;
+    int samplesBlackRight = 0;
+
+    int samplesVSyncShort = 0;
+    int samplesVSyncLong = 0;
+
+    uint8_t levelSync = 0;
+    uint8_t levelBlank = 0;
+    uint8_t levelBlack = 0;
+    uint8_t levelWhite = 0;
+    uint8_t grayValues = 0;
+
+    int targetXres = 0;
+    int targetYres = 0;
+    int targetYresEven = 0;
+    int targetYresOdd = 0;
+
+    int linesEven = 0;
+    int linesOdd = 0;
+    int linesEvenActive = 0;
+    int linesOddActive = 0;
+    int linesEvenVisible = 0;
+    int linesOddVisible = 0;
+    int linesEvenBlankTop = 0;
+    int linesEvenBlankBottom = 0;
+    int linesOddBlankTop = 0;
+    int linesOddBlankBottom = 0;
+
+    int m_buffer_width = 0;
+    int m_buffer_height = 0;
+    int m_bpp = 0;
+
+//    float pixelAspect;
+
+    uint16_t *line = nullptr;
+    uint16_t *m_end = nullptr;
+    uint16_t *m_ptr = nullptr;
+
+    void init_hardware();
+    void check_buffer();
+    void generate_vsync();
+    void generate_long_sync();
+    void generate_short_sync();
+    void generate_long_short_sync();
+    void generate_short_long_sync();
+    void generate_short_blank_sync();
+    void generate_blank_short_sync();
+    void generate_blank_line();
+    const uint8_t * generate_line_from_buffer(const uint8_t * buffer);
+};
+
+#endif
+