Initial WIP

examples/Readme.md

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+Arduino Examples for PicoDVI Library
+====================================

examples/hello/hello.ino

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+#include <PicoDVI.h>
+
+PicoDVI dvi(320, 240, VREG_VOLTAGE_1_20, dvi_timing_640x480p_60hz);
+
+void setup() {
+  dvi.begin();
+}
+
+void loop() {
+}

library.properties

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+name=PicoDVI
+version=1.0.0
+author=Wren6991
+maintainer=Luke Wren
+sentence=Arduino library for RP2040 DVI output
+paragraph=Arduino library for RP2040 DVI output
+category=Display
+url=https://github.com/Wren6991/PicoDVI
+architectures=rp2040
+depends=

software/libdvi/dvi_serialiser.pio.h

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+// -------------------------------------------------- //
+// This file is autogenerated by pioasm; do not edit! //
+// -------------------------------------------------- //
+
+#pragma once
+
+#if !PICO_NO_HARDWARE
+#include "hardware/pio.h"
+#endif
+
+// -------------- //
+// dvi_serialiser //
+// -------------- //
+
+#define dvi_serialiser_wrap_target 0
+#define dvi_serialiser_wrap 1
+
+static const uint16_t dvi_serialiser_program_instructions[] = {
+            //     .wrap_target
+    0x70a1, //  0: out    pc, 1           side 2     
+    0x68a1, //  1: out    pc, 1           side 1     
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program dvi_serialiser_program = {
+    .instructions = dvi_serialiser_program_instructions,
+    .length = 2,
+    .origin = 0,
+};
+
+static inline pio_sm_config dvi_serialiser_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + dvi_serialiser_wrap_target, offset + dvi_serialiser_wrap);
+    sm_config_set_sideset(&c, 2, false, false);
+    return c;
+}
+#endif
+
+// -------------------- //
+// dvi_serialiser_debug //
+// -------------------- //
+
+#define dvi_serialiser_debug_wrap_target 0
+#define dvi_serialiser_debug_wrap 11
+
+static const uint16_t dvi_serialiser_debug_program_instructions[] = {
+            //     .wrap_target
+    0x98e0, //  0: pull   ifempty block   side 1     
+    0xb042, //  1: nop                    side 0     
+    0x6001, //  2: out    pins, 1                    
+    0x6001, //  3: out    pins, 1                    
+    0x6001, //  4: out    pins, 1                    
+    0x6001, //  5: out    pins, 1                    
+    0x6001, //  6: out    pins, 1                    
+    0x6001, //  7: out    pins, 1                    
+    0x6001, //  8: out    pins, 1                    
+    0x6001, //  9: out    pins, 1                    
+    0x6001, // 10: out    pins, 1                    
+    0x6001, // 11: out    pins, 1                    
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program dvi_serialiser_debug_program = {
+    .instructions = dvi_serialiser_debug_program_instructions,
+    .length = 12,
+    .origin = -1,
+};
+
+static inline pio_sm_config dvi_serialiser_debug_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + dvi_serialiser_debug_wrap_target, offset + dvi_serialiser_debug_wrap);
+    sm_config_set_sideset(&c, 2, true, false);
+    return c;
+}
+
+#include "dvi_config_defs.h"
+static inline void dvi_serialiser_program_init(PIO pio, uint sm, uint offset, uint data_pins, bool debug) {
+    pio_sm_set_pins_with_mask(pio, sm, 2u << data_pins, 3u << data_pins);
+    pio_sm_set_pindirs_with_mask(pio, sm, ~0u, 3u << data_pins);
+    pio_gpio_init(pio, data_pins);
+    pio_gpio_init(pio, data_pins + 1);
+    pio_sm_config c;
+    if (debug) {
+        c = dvi_serialiser_debug_program_get_default_config(offset);
+    }
+    else {
+        c = dvi_serialiser_program_get_default_config(offset);
+    }
+    sm_config_set_sideset_pins(&c, data_pins);
+    if (debug)
+	    sm_config_set_out_pins(&c, data_pins, 1);
+    sm_config_set_out_shift(&c, true, !debug, 10 * DVI_SYMBOLS_PER_WORD);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, false);
+}
+
+#endif
+

src/PicoDVI.cpp

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+#include "PicoDVI.h"
+#include <stdlib.h>
+
+PicoDVI::PicoDVI(uint16_t w, uint16_t h, vreg_voltage v, const struct dvi_timing &t) {
+  framebuf_width = w;
+  framebuf_height = h;
+  timing = &t;
+  voltage = v;
+}
+
+PicoDVI::~PicoDVI(void) {
+  if (framebuf) free(framebuf);
+}
+
+bool PicoDVI::begin(void) {
+  if ((framebuf = (uint16_t *)malloc(framebuf_width * framebuf_height * sizeof(uint16_t)))) {
+    return true;
+  }
+  return false;
+}
+
+#if 0
+void core1_main() {
+        dvi_register_irqs_this_core(&dvi0, DMA_IRQ_0);
+        dvi_start(&dvi0);
+        dvi_scanbuf_main_16bpp(&dvi0);
+        __builtin_unreachable();
+}
+
+void core1_scanline_callback() {
+        // Discard any scanline pointers passed back
+        uint16_t *bufptr;
+        while (queue_try_remove_u32(&dvi0.q_colour_free, &bufptr))
+                ;
+        // // Note first two scanlines are pushed before DVI start
+        static uint scanline = 2;
+        bufptr = &framebuf[FRAME_WIDTH * scanline];
+        queue_add_blocking_u32(&dvi0.q_colour_valid, &bufptr);
+        scanline = (scanline + 1) % FRAME_HEIGHT;
+}
+#endif

src/PicoDVI.h

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+#pragma once
+
+#include "hardware/vreg.h" // In Pico SDK
+#include "libdvi/dvi.h"    // Requires soft link in src to ../software/libdvi
+#include "libdvi/dvi_timing.h"
+// Also, one must build PicoDVI via the usual route (mkdir build & cmake, etc.)
+// and copy dvi_serialiser.pio.h to libdvi. 'build' is in .gitignore and
+// doesn't get included w/push.
+
+class PicoDVI {
+public:
+  PicoDVI(uint16_t w, uint16_t h, vreg_voltage v, const struct dvi_timing &t);
+  ~PicoDVI(void);
+  bool begin(void);
+private:
+  uint16_t *framebuf = NULL;
+  uint16_t framebuf_width;
+  uint16_t framebuf_height;
+  struct dvi_inst dvi0;
+  const struct dvi_timing *timing;
+  vreg_voltage voltage;
+};

src/Readme.md

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+Arduino wrapper for PicoDVI Library
+===================================

src/libdvi

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+../software/libdvi