Прошло 2 года.

lib/epdiy/examples/grayscale_test/main/CMakeLists.txt

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+set(app_sources "main.c")
+
+idf_component_register(SRCS ${app_sources} REQUIRES epdiy)

lib/epdiy/examples/grayscale_test/main/main.c

@@ -0,0 +1,81 @@
+/*
+ * Test program for displaying a grayscale pattern.
+ *
+ * Use this to calibrate grayscale timings for new displays or test alternative waveforms.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "esp_heap_caps.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "sdkconfig.h"
+
+#include "epd_highlevel.h"
+#include "epdiy.h"
+
+// choose the default demo board depending on the architecture
+#ifdef CONFIG_IDF_TARGET_ESP32
+#define DEMO_BOARD epd_board_v6
+#elif defined(CONFIG_IDF_TARGET_ESP32S3)
+#define DEMO_BOARD epd_board_v7
+#endif
+
+#define WAVEFORM EPD_BUILTIN_WAVEFORM
+
+EpdiyHighlevelState hl;
+
+void write_grayscale_pattern(bool direction, uint8_t* fb) {
+    int ep_width = epd_width();
+    uint8_t grayscale_line[ep_width / 2];
+    if (direction) {
+        for (uint32_t i = 0; i < ep_width / 2; i++) {
+            uint8_t segment = i / (ep_width / 16 / 2);
+            grayscale_line[i] = (segment << 4) | segment;
+        }
+    } else {
+        for (uint32_t i = 0; i < ep_width / 2; i++) {
+            uint8_t segment = (ep_width / 2 - i - 1) / (ep_width / 16 / 2);
+            grayscale_line[i] = (segment << 4) | segment;
+        }
+    }
+    for (uint32_t y = 0; y < epd_height(); y++) {
+        memcpy(fb + ep_width / 2 * y, grayscale_line, ep_width / 2);
+    }
+}
+
+void loop() {
+    uint8_t* fb = epd_hl_get_framebuffer(&hl);
+
+    write_grayscale_pattern(false, fb);
+
+    int temperature = 25;  // epd_ambient_temperature();
+
+    epd_poweron();
+    epd_clear();
+    enum EpdDrawError err = epd_hl_update_screen(&hl, MODE_GC16, temperature);
+    epd_poweroff();
+
+    vTaskDelay(5000);
+
+    write_grayscale_pattern(true, fb);
+
+    epd_poweron();
+    err = epd_hl_update_screen(&hl, MODE_GC16, temperature);
+    if (err != EPD_DRAW_SUCCESS) {
+        printf("Error in epd_hl_update_screen:%d\n", err);
+    }
+    epd_poweroff();
+
+    vTaskDelay(100000);
+}
+
+void IRAM_ATTR app_main() {
+    epd_init(&DEMO_BOARD, &ED097TC2, EPD_LUT_64K);
+    epd_set_vcom(1560);
+    hl = epd_hl_init(WAVEFORM);
+
+    while (1) {
+        loop();
+    };
+}