From 18350e6fd760519e448029dd3697a9abb7407117 Mon Sep 17 00:00:00 2001
From: Martin Fasani <fasani@skygate.de>
Date: Tue, 1 Jun 2021 16:15:31 +0200
Subject: [PATCH] Add old calepd version

---
 lvgl_tft/calepd_epaper.cpp | 66 ++++++++++++++++++++++++++++++++++++++
 lvgl_tft/calepd_epaper.h   | 36 +++++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 lvgl_tft/calepd_epaper.cpp
 create mode 100644 lvgl_tft/calepd_epaper.h

diff --git a/lvgl_tft/calepd_epaper.cpp b/lvgl_tft/calepd_epaper.cpp
new file mode 100644
index 0000000..4ea6c89
--- /dev/null
+++ b/lvgl_tft/calepd_epaper.cpp
@@ -0,0 +1,66 @@
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "epdiy_epaper.h"
+
+// NOTE: This needs Epdiy component https://github.com/vroland/epdiy
+// Run idf.py menuconfig-> Component Config -> E-Paper driver and select:
+// Display type: LILIGO 4.7 ED047TC1
+// Board: LILIGO T5-4.7 Epaper
+// In the same section Component Config -> ESP32 Specifics -> Enable PSRAM
+#include "parallel/ED047TC1.h"
+Ed047TC1 display;
+
+/*********************
+ *      DEFINES
+ *********************/
+#define TAG "EPDIY"
+
+uint16_t flushcalls = 0;
+
+/* Display initialization routine */
+void epdiy_init(void)
+{
+    printf("epdiy_init\n");
+    display.init();
+    display.setRotation(0);
+    display.clearScreen();
+}
+
+/* Required by LVGL */
+void epdiy_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map)
+{
+    ++flushcalls;
+    printf("epdiy_flush %d x:%d y:%d w:%d h:%d\n", flushcalls,area->x1,area->y1,lv_area_get_width(area),lv_area_get_height(area));
+
+    // Full update
+    if (lv_area_get_width(area)==display.width() && lv_area_get_height(area)==display.height()) {
+      display.update();
+    } else {
+      // Partial update: Looks nice but should find a way to clear that area first. Mode: MODE_EPDIY_WHITE_TO_GL16
+      display.updateWindow(area->x1,area->y1,lv_area_get_width(area),lv_area_get_height(area),MODE_GC16);
+    }
+    
+    /* IMPORTANT!!!
+     * Inform the graphics library that you are ready with the flushing */
+    lv_disp_flush_ready(drv);
+}
+
+/* Called for each pixel */
+void epdiy_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t* buf,
+    lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
+    lv_color_t color, lv_opa_t opa)
+{
+    // Is printing Y axis only till 40 px: And flushing too many times
+    //printf("%d ", (int16_t)y); // Works and prints "Hello world"
+    //printf("%d ",(int16_t)color.full); // Debug colors
+    // Test using RGB232
+    int16_t epd_color = EPD_WHITE;
+
+    // Color setting use: RGB232
+    if ((int16_t)color.full<250) {
+        epd_color = (int16_t)color.full/3;
+    }
+    display.drawPixel((int16_t)x, (int16_t)y, epd_color);
+}
diff --git a/lvgl_tft/calepd_epaper.h b/lvgl_tft/calepd_epaper.h
new file mode 100644
index 0000000..b9cfba7
--- /dev/null
+++ b/lvgl_tft/calepd_epaper.h
@@ -0,0 +1,36 @@
+/**
+ * Display class for generic e-Paper driven by EPDiy class
+*/
+#ifndef CALEPD_H
+#define CALEPD_H
+
+#define EPDIY_COLUMNS          (LV_HOR_RES_MAX / 8)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+ #include "lvgl/lvgl.h"
+#endif
+#include "sdkconfig.h"
+
+/* Configure your display */
+void epdiy_init(void);
+
+/* LVGL callbacks */
+void epdiy_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map);
+
+/* Only for monochrome displays. But we use epdiy_set_px also for epapers */
+//void epdiy_rounder(lv_disp_drv_t *disp_drv, lv_area_t *area);
+void epdiy_set_px_cb(lv_disp_drv_t *disp_drv, uint8_t *buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y, lv_color_t color, lv_opa_t opa);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+
+#endif /* EPDIY_H */
\ No newline at end of file