Add simple PCB tester script (soldering)

examples/v7-pcb-tester/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16.0)
+set(EXTRA_COMPONENT_DIRS "../../")
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(pcb_tester)

examples/v7-pcb-tester/README.md

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+PCB tester
+==========
+
+This PCB tester is just a simple script that will iterate first the data lines (0 to 15) in a sequencial mode. 
+Then it will light all of them at the same time and turn it down.
+And then as latest step will do the same with the signals.
+
+That way you can discover in a simple way if there is any bridge in your soldering, either in MCU or in the FPC connectors, without the need to connect a display.
+
+The PCB you can find in the [vroland.github.io/epdiy-hardware](https://vroland.github.io/epdiy-hardware) open source files. But you can also do it yourself with a 40 pin expander breakout and soldering the Leds+ Resistances manually.

examples/v7-pcb-tester/main/CMakeLists.txt

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

examples/v7-pcb-tester/main/main.c

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+/* Simple firmware to turn HIGH and Low sequencially the Data and Signals for controlling epaper
+ * displays */
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "epdiy.h"
+
+#include <driver/gpio.h>
+
+#define D15 GPIO_NUM_47
+#define D14 GPIO_NUM_21
+#define D13 GPIO_NUM_14
+#define D12 GPIO_NUM_13
+#define D11 GPIO_NUM_12
+#define D10 GPIO_NUM_11
+#define D9 GPIO_NUM_10
+#define D8 GPIO_NUM_9
+
+#define D7 GPIO_NUM_8
+#define D6 GPIO_NUM_18
+#define D5 GPIO_NUM_17
+#define D4 GPIO_NUM_16
+#define D3 GPIO_NUM_15
+#define D2 GPIO_NUM_7
+#define D1 GPIO_NUM_6
+#define D0 GPIO_NUM_5
+
+/* Control Lines */
+#define CKV GPIO_NUM_48
+#define STH GPIO_NUM_41
+#define LEH GPIO_NUM_42
+#define STV GPIO_NUM_45
+/* Edges */
+#define CKH GPIO_NUM_4
+
+gpio_num_t data_bus[] = {D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15};
+
+gpio_num_t signal_bus[] = {CKV, STH, LEH, STV, CKH};
+
+void idf_loop() {
+    // Sequence data GPIOs
+    for (int x = 0; x < 16; x++) {
+        printf("IO:%d\n", (int)data_bus[x]);
+        gpio_set_level(data_bus[x], 1);
+        vTaskDelay(pdMS_TO_TICKS(100));
+        gpio_set_level(data_bus[x], 0);
+        vTaskDelay(pdMS_TO_TICKS(20));
+    }
+    vTaskDelay(pdMS_TO_TICKS(800));
+
+    // Sequence signal GPIOs
+    for (int x = 0; x < 5; x++) {
+        gpio_set_level(signal_bus[x], 1);
+        vTaskDelay(pdMS_TO_TICKS(200));
+        gpio_set_level(signal_bus[x], 0);
+        vTaskDelay(pdMS_TO_TICKS(20));
+    }
+    vTaskDelay(pdMS_TO_TICKS(800));
+}
+
+void idf_setup() {
+    // If we do not instance epdiy then we should declare all the Data and signals as OUTPUT
+    epd_init(&epd_board_v7, &ED078KC1, EPD_LUT_64K);
+
+    epd_set_vcom(1560);
+
+    // Sequence data GPIOs
+    // Initialize GPIOs direction & initial states
+    printf("Set all IOs output\n\n");
+    for (int x = 0; x < 16; x++) {
+        gpio_set_direction(data_bus[x], GPIO_MODE_OUTPUT);
+    }
+    for (int x = 0; x < 5; x++) {
+        gpio_set_direction(signal_bus[x], GPIO_MODE_OUTPUT);
+    }
+}
+
+#ifndef ARDUINO_ARCH_ESP32
+void app_main() {
+    idf_setup();
+
+    while (1) {
+        idf_loop();
+    };
+}
+#endif

examples/v7-pcb-tester/main/main.ino

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+/**
+ * This is the Arduino wrapper for the "Demo" example.
+ * Please go to the main.c for the main example file.
+ *
+ * This example was developed for the ESP IoT Development Framework (IDF).
+ * You can still use this code in the Arduino IDE, but it may not look
+ * and feel like a classic Arduino sketch.
+ * If you are looking for an example with Arduino look-and-feel,
+ * please check the other examples.
+ */
+
+// Important: These are C functions, so they must be declared with C linkage!
+extern "C" {
+void idf_setup();
+void idf_loop();
+}
+
+void setup() {
+    if (psramInit()) {
+        Serial.println("\nThe PSRAM is correctly initialized");
+    } else {
+        Serial.println("\nPSRAM does not work");
+    }
+
+    idf_setup();
+}
+
+void loop() {
+    idf_loop();
+}