Add ESP-IDF grayscale test

examples/esp_idf/grayscale_test/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.5)
+
+set(EXTRA_COMPONENT_DIRS "../../..")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(grayscale_test)

examples/esp_idf/grayscale_test/main/CMakeLists.txt

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+
+set(
+    app_sources "grayscale_test.cpp"
+    )
+
+idf_component_register(SRCS ${app_sources} 
+    REQUIRES
+    esp_wifi driver esp_lcd
+    nvs_flash esp-tls esp_http_client esp_timer
+    FastEPD #Must be the same name as the git root folder
+    )

examples/esp_idf/grayscale_test/main/grayscale_test.cpp

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+#include <FastEPD.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "esp_log.h"
+
+#include <string>
+
+FASTEPD epaper;
+
+unsigned int WIDTH = 1872;
+unsigned int HEIGHT = 1404;
+int PANNEL = BB_PANEL_V7_103;
+
+extern "C" {
+void app_main();
+}
+
+static const char *TAG = "GRAYSCALE_TEST";
+
+void drawTest(bool flipped) {
+    epaper.fillScreen(0xf);
+    int color = (flipped) ? 15 : 0;
+    epaper.setFont(FONT_12x16);
+    epaper.setTextColor(BBEP_BLACK);
+    for (int i=0; i<WIDTH; i+=WIDTH/16) {
+        std::string str = std::to_string(color);
+        epaper.drawString(str.c_str(), i+(WIDTH/32), HEIGHT-50+5);
+        epaper.fillRect(i, 0, WIDTH/16, HEIGHT-50, flipped ? color-- : color++);
+    }
+    epaper.fullUpdate();
+}
+void app_main(void)
+{
+    epaper.initPanel(PANNEL);
+    epaper.setPanelSize(WIDTH, HEIGHT);
+    epaper.setMode(BB_MODE_4BPP);
+
+    ESP_LOGI(TAG, "Starting grayscale test");
+    bool flipped = false;
+    while (1) {
+        ESP_LOGI(TAG, "Drawing test with orientation %d", flipped);
+        drawTest(flipped);
+        flipped = !flipped;
+        vTaskDelay(5000 / portTICK_PERIOD_MS);
+    }
+}