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Fix VCLK at half rate; chunk the DMA stream; cycle test images
PCNT measurement showed I2S0 BCK (VCLK) rising once per two bytes in 8-bit LCD mode, so the panel saw every other byte. Each VCLK is now two identical bytes at a 10 MHz byte rate (VCLK 5 MHz). The doubled ~142 KB stream is allocated as 38 per-descriptor chunks. The test sketch now cycles through 12 labelled test images. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mangavalkandClaude Opus 5.5 committed
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@@ -1,4 +1,4 @@
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// Test sketch: bring up the EL512.256-H and draw a test pattern with Adafruit GFX.
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// Test sketch: bring up the EL512.256-H and slowly cycle through test images.
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#include <Arduino.h>
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#include <EL512.h>
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@@ -15,27 +15,137 @@ static EL512Panel panel({
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});
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static EL512_GFX display(panel);
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static void drawTestPattern() {
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display.fillScreen(0);
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display.drawRect(0, 0, display.width(), display.height(), 1);
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display.drawLine(0, 0, display.width() - 1, display.height() - 1, 1);
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display.drawLine(display.width() - 1, 0, 0, display.height() - 1, 1);
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static constexpr uint32_t IMAGE_MS = 5000; // time per test image
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// Checkerboard strip to check VID/TVID column ordering.
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for (int16_t y = 8; y < 24; y++)
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for (int16_t x = 8; x < 136; x++)
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if ((x ^ y) & 1) display.drawPixel(x, y, 1);
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static const int16_t W = EL512Panel::WIDTH;
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static const int16_t H = EL512Panel::HEIGHT;
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display.fillCircle(display.width() / 2, display.height() / 2, 40, 1);
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// Name tag in the bottom-right corner so each image can be identified.
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static void drawLabel(const char* name) {
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int16_t bx, by;
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uint16_t bw, bh;
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display.setTextSize(1);
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display.getTextBounds(name, 0, 0, &bx, &by, &bw, &bh);
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const int16_t w = bw + 8, h = bh + 6;
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const int16_t x = W - w - 4, y = H - h - 4;
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display.fillRect(x, y, w, h, 0);
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display.drawRect(x, y, w, h, 1);
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display.setTextColor(1);
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display.setCursor(x + 4, y + 3);
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display.print(name);
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}
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static void drawOverview() {
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display.drawRect(0, 0, W, H, 1);
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display.drawLine(0, 0, W - 1, H - 1, 1);
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display.drawLine(W - 1, 0, 0, H - 1, 1);
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display.fillCircle(W / 2, H / 2, 40, 1);
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display.setTextColor(1);
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display.setTextSize(2);
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display.setCursor(8, 32);
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display.setCursor(8, 8);
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display.print("EL512.256-H");
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display.setTextSize(1);
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display.setCursor(8, 56);
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display.printf("%ux%u %.1f Hz", EL512Panel::WIDTH, EL512Panel::HEIGHT,
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EL512Panel::refreshHz());
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display.setCursor(8, 32);
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display.printf("%ux%u %.1f Hz", W, H, EL512Panel::refreshHz());
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}
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static void drawAllOff() {}
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static void drawAllOn() { display.fillScreen(1); }
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// Datasheet columns are numbered from 1: x = 0 is column 1 (odd, TVID).
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static void drawVidColumns() {
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for (int16_t x = 1; x < W; x += 2) display.drawFastVLine(x, 0, H, 1);
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}
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static void drawTvidColumns() {
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for (int16_t x = 0; x < W; x += 2) display.drawFastVLine(x, 0, H, 1);
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}
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static void drawRowStripes() {
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for (int16_t y = 0; y < H; y += 2) display.drawFastHLine(0, y, W, 1);
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}
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static void drawCheckerboard() {
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for (int16_t y = 0; y < H; y++)
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for (int16_t x = 0; x < W; x++)
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if ((x ^ y) & 1) display.drawPixel(x, y, 1);
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}
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static void drawBlocks() {
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for (int16_t y = 0; y < H; y += 16)
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for (int16_t x = 0; x < W; x += 16)
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if (((x ^ y) >> 4) & 1) display.fillRect(x, y, 16, 16, 1);
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}
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static void drawGrid() {
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display.setTextSize(1);
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display.setTextColor(1);
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for (int16_t x = 0; x < W; x += 32) display.drawFastVLine(x, 0, H, 1);
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for (int16_t y = 0; y < H; y += 32) display.drawFastHLine(0, y, W, 1);
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display.drawFastVLine(W - 1, 0, H, 1);
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display.drawFastHLine(0, H - 1, W, 1);
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for (int16_t y = 0; y < H; y += 64)
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for (int16_t x = 0; x < W; x += 64) {
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display.setCursor(x + 3, y + 3);
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display.printf("%d,%d", x, y);
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}
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}
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static void drawCircles() {
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for (int16_t r = 8; r < W; r += 12) display.drawCircle(W / 2, H / 2, r, 1);
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}
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// Ordered 4x4 dither from left (dark) to right (bright).
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static void drawDither() {
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static const uint8_t bayer[4][4] = {
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{0, 8, 2, 10}, {12, 4, 14, 6}, {3, 11, 1, 9}, {15, 7, 13, 5}};
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for (int16_t y = 0; y < H; y++)
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for (int16_t x = 0; x < W; x++)
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if (bayer[y & 3][x & 3] < (x * 17) / W) display.drawPixel(x, y, 1);
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}
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static void drawText() {
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display.setTextColor(1);
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display.setTextSize(1);
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display.setCursor(0, 0);
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for (int line = 0; line < 30; line++) {
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for (char c = ' ' + (line % 3) * 32; c < ' ' + (line % 3) * 32 + 32 && c <= '~'; c++)
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display.print(c);
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display.print(" The quick brown fox jumps over the lazy dog.\n");
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}
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display.setTextSize(3);
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display.setCursor(8, H - 40);
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display.print("Size 3 text");
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}
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struct TestImage {
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const char* name;
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void (*draw)();
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};
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static const TestImage images[] = {
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{"overview", drawOverview},
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{"all off", drawAllOff},
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{"all on", drawAllOn},
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{"VID columns (even)", drawVidColumns},
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{"TVID columns (odd)", drawTvidColumns},
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{"row stripes", drawRowStripes},
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{"checkerboard", drawCheckerboard},
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{"16px blocks", drawBlocks},
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{"grid 32px", drawGrid},
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{"circles", drawCircles},
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{"dither ramp", drawDither},
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{"text", drawText},
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};
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static constexpr size_t IMAGE_COUNT = sizeof(images) / sizeof(images[0]);
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static void showImage(size_t i) {
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display.fillScreen(0);
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images[i].draw();
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drawLabel(images[i].name);
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display.display();
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Serial.printf("image %u/%u: %s\n", (unsigned)(i + 1), (unsigned)IMAGE_COUNT, images[i].name);
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}
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void setup() {
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@@ -46,18 +156,16 @@ void setup() {
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Serial.println("panel init failed (out of DMA memory?)");
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while (true) delay(1000);
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}
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drawTestPattern();
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Serial.printf("free heap: %u\n", ESP.getFreeHeap());
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showImage(0);
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}
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void loop() {
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static uint32_t last = 0;
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static uint32_t seconds = 0;
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if (millis() - last >= 1000) {
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static size_t current = 0;
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static uint32_t last = millis();
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if (millis() - last >= IMAGE_MS) {
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last = millis();
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display.fillRect(8, 72, 120, 8, 0);
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display.setCursor(8, 72);
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display.printf("uptime %lus", (unsigned long)seconds++);
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display.display();
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current = (current + 1) % IMAGE_COUNT;
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showImage(current);
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}
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}
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