part4

part4_inputs_outputs/lab1-2/main.c

@@ -0,0 +1,118 @@
+/****************************************************************************
+ * Copyright (C) 2021 by Fabrice Muller                                     *
+ *                                                                          *
+ * This file is useful for ESP32 Design course.                             *
+ *                                                                          *
+ ****************************************************************************/
+
+/**
+ * @file main.c
+ * @author Fabrice Muller
+ * @date 31 Oct. 2021
+ * @brief File containing the lab1-2 of Part 4.
+ *
+ * @see https://github.com/fmuller-pns/esp32-vscode-project-template
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "freertos/FreeRTOSConfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "esp_timer.h"
+#include "esp_sleep.h"
+
+#include "driver/gpio.h"
+#include "driver/dac.h"
+
+#include "driver/adc.h"
+#include "driver/adc_common.h"
+#include "esp_adc_cal.h"
+
+/*
+ADC : Analog to Digital Converter
+Documentation:
+https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html
+
+
+Command to obtain Vref: 
+espefuse.py --port /dev/ttyUSB0 adc_info
+
+*/
+
+/* Default eFuse Vref in mV */
+#define DEFAULT_VREF 1121
+
+const adc_unit_t unit = ADC_UNIT_1;
+const adc_channel_t channel = ADC_CHANNEL_1;   
+const adc_bits_width_t width = ADC_WIDTH_BIT_10;
+const adc_atten_t atten = ADC_ATTEN_DB_11;
+
+
+esp_adc_cal_characteristics_t *adc_chars;
+
+/**
+ * @brief Print the Characterization type.
+ * 
+ * @param val_type type of characterization
+ */
+static void print_char_val_type(esp_adc_cal_value_t val_type) {
+	switch (val_type) {
+		case ESP_ADC_CAL_VAL_EFUSE_TP:
+        	printf("Characterized using Two Point Value\n");
+			break;
+		case ESP_ADC_CAL_VAL_EFUSE_VREF:
+        	printf("Characterized using eFuse Vref (%d mV)\n", DEFAULT_VREF);
+			break;
+		default:
+        	printf("Characterized using Default Vref\n");
+    }
+}
+
+
+/**
+ * @brief Starting point function
+ * 
+ */
+
+void app_main(void) {
+
+	/* Configure ADC */
+	adc1_config_width(width);	
+   	adc1_config_channel_atten(channel, atten);
+
+    /* Characterize ADC */
+    adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
+    esp_adc_cal_value_t val_type = esp_adc_cal_characterize(unit, atten, width, DEFAULT_VREF, adc_chars);
+    print_char_val_type(val_type);
+
+	uint16_t measuredValues;
+	int v;
+
+	for (;;) {
+
+		/* Get start time */
+		int64_t t1 = esp_timer_get_time();
+
+		/* Perform measure */
+		v = adc1_get_raw(channel);
+		measuredValues = esp_adc_cal_raw_to_voltage(v, adc_chars);
+
+		/* Get end time */
+		int64_t t2 = esp_timer_get_time();
+
+		/* Print time conversion and voltage */
+		printf("full time conversion = %lld µs\n", t2-t1);
+		printf("V = %d mV\n", measuredValues);
+
+		/* Every second */
+		vTaskDelay(pdMS_TO_TICKS(1000));
+	}
+
+	/* to ensure its exit is clean */
+	vTaskDelete(NULL);
+}
+

part4_inputs_outputs/lab1-2/sdkconfig.defaults

@@ -0,0 +1,3 @@
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE="4MB"
+

part4_inputs_outputs/lab2_pwm/main.c

@@ -0,0 +1,92 @@
+/****************************************************************************
+ * Copyright (C) 2021 by Fabrice Muller                                     *
+ *                                                                          *
+ * This file is useful for ESP32 Design course.                             *
+ *                                                                          *
+ ****************************************************************************/
+
+/**
+ * @file main.c
+ * @author Fabrice Muller
+ * @date 02 Nov. 2021
+ * @brief File containing the lab2 of Part 4.
+ *
+ * @see https://github.com/fmuller-pns/esp32-vscode-project-template
+ */
+
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/ledc.h"
+#include "esp_err.h"
+
+#include "soc/ledc_reg.h"
+
+
+/*
+Documentation:
+https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/ledc.html
+
+*/
+
+/**
+ * @brief Starting point function
+ * 
+ */
+void app_main(void) {
+
+  /* 
+   * LEDC Timer configuration
+   * Timer 0, Low speed mode, Auto clk, Résolution 10bits, Frequency 5 KHz
+   */
+  ledc_timer_config_t timer = {
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .duty_resolution = LEDC_TIMER_10_BIT,
+      .timer_num = LEDC_TIMER_0,
+      .freq_hz = 5000,
+      .clk_cfg = LEDC_AUTO_CLK};
+
+  ledc_timer_config(&timer);
+
+  /*
+   * Channel configuration
+   * Timer 0, Channel 0, GPIO21 pin, Low speed mode, duty=0
+   */
+  ledc_channel_config_t channel = {
+      .gpio_num = 21,
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .channel = LEDC_CHANNEL_0,  
+      .timer_sel = LEDC_TIMER_0,
+      .duty = 0,    
+      .hpoint = 0
+      };
+
+  ledc_channel_config(&channel);
+
+  /* Fade installation */
+  esp_err_t result = ledc_fade_func_install(0);
+  if (result != ESP_OK) {
+    printf("Error installing fade: %04x\n", result);  
+    return;
+  }
+
+  /* First scenario */
+  printf("First scenario\n");
+
+  for (int i = 0; i < 1024; i++) {
+    ledc_set_duty_and_update(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0,i,0);
+    vTaskDelay(pdMS_TO_TICKS(10));
+  }
+
+  /* Second scenario */
+  printf("Second scenario\n");
+
+  while(true) {
+    printf("Action 1\n");
+    ledc_set_fade_time_and_start(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0, 0, 2000, LEDC_FADE_WAIT_DONE);
+
+    printf("Action 2\n");
+    ledc_set_fade_time_and_start(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0, 1024, 5000, LEDC_FADE_WAIT_DONE);
+  }
+
+}

part4_inputs_outputs/lab3_uart/.gitignore

@@ -0,0 +1,10 @@
+
+# Configuration files
+sdkconfig
+sdkconfig.old
+
+# Production folder
+build/
+
+# HTML documentation
+html_doc/

part4_inputs_outputs/lab3_uart/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(main)

part4_inputs_outputs/lab3_uart/Makefile

@@ -0,0 +1,3 @@
+PROJECT_NAME := main
+
+include $(IDF_PATH)/make/project.mk

part4_inputs_outputs/lab3_uart/ftdi_ft2232.cfg

@@ -0,0 +1,22 @@
+interface ftdi
+ftdi_vid_pid 0x0403 0x6010
+ftdi_layout_init 0x0038 0x003b
+
+# The ESP32 only supports JTAG.
+transport select jtag
+
+# This can go as high as 20MHz if CPU frequency is 80MHz, or 26MHz
+# if CPU frequency is 160MHz or 240MHz.
+adapter_khz 20000
+
+# If single core debugging is required, uncomment the following line
+#set ESP32_ONLYCPU 1
+
+# To disable RTOS support, uncomment the following line
+# set ESP32_RTOS none
+
+# This option defaults to 3.3v
+set ESP32_FLASH_VOLTAGE 3.3
+
+# Source the ESP32 configuration file
+source [find target/esp32.cfg]

part4_inputs_outputs/lab3_uart/main/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(
+            SRC_DIRS "." 
+            INCLUDE_DIRS ".")

part4_inputs_outputs/lab3_uart/main/component.mk

@@ -0,0 +1,2 @@
+COMPONENT_SRCDIRS := .
+COMPONENT_ADD_INCLUDEDIRS := .

part4_inputs_outputs/lab3_uart/main/main.c

@@ -0,0 +1,99 @@
+/****************************************************************************
+ * Copyright (C) 2021 by Fabrice Muller                                     *
+ *                                                                          *
+ * This file is useful for ESP32 Design course.                             *
+ *                                                                          *
+ ****************************************************************************/
+
+/**
+ * @file main.c
+ * @author Fabrice Muller
+ * @date 02 Nov. 2021
+ * @brief File containing the lab3 of Part 4.
+ *
+ * @see https://github.com/fmuller-pns/esp32-vscode-project-template
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "esp_log.h"
+
+#include "esp_intr_alloc.h"
+
+#include "freertos/FreeRTOSConfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "driver/uart.h"
+#include "driver/gpio.h"
+
+static const char *TAG = "MAIN"; 
+
+// GPIO18
+#define TXD_PIN 18
+// GPIO23
+#define RXD_PIN 23
+// Not Connected
+#define RTS_PIN (UART_PIN_NO_CHANGE)
+// Not Connected
+#define CTS_PIN (UART_PIN_NO_CHANGE)
+
+// Port number : 2
+#define UART_PORT_NUM      2
+
+// Rate : 115200
+#define UART_BAUD_RATE     115200
+
+#define TASK_STACK_SIZE    2048
+
+#define BUF_SIZE (1024)
+static char data[BUF_SIZE];
+
+/**
+ * @brief Starting point function
+ * 
+ */
+
+void app_main(void) {
+
+	printf("Echo UART\n");
+	
+    /* Configure parameters of the UART driver,
+     * communication pins and install the driver.
+     *
+     * Configuration: 115000 BAUDS, 8 BITS, No Parity, 1 STOP BIT, No Flow Control, APB CLK
+     */
+    uart_config_t uart_config = {
+        .baud_rate = UART_BAUD_RATE,   
+        .data_bits = 0x3,
+        .parity    = 0x0,
+        .stop_bits = 0x1,
+        .flow_ctrl = 0x0,
+        .source_clk = 0x0,
+    };
+
+    ESP_ERROR_CHECK(uart_driver_install(UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, 0));
+    ESP_ERROR_CHECK(uart_param_config(UART_PORT_NUM, &uart_config));
+    ESP_ERROR_CHECK(uart_set_pin(UART_PORT_NUM, TXD_PIN, RXD_PIN, RTS_PIN, CTS_PIN));
+
+     char text[100];
+	for (int iter=0; iter<10; iter++) {
+
+         sprintf(text, "(iter = %d) => HELLO, I'M TESTING UART !\r\n", iter);
+
+        // Write data back to the UART
+ 		int length = uart_write_bytes(UART_PORT_NUM, (const char *) text, strlen(text));
+        if (length == -1)
+            ESP_LOGE(TAG, "Error when writing in UART.");
+
+		vTaskDelay(pdMS_TO_TICKS(1000));
+
+		// Read data from the UART
+        length = uart_read_bytes(UART_PORT_NUM, data, BUF_SIZE, 20 / portTICK_RATE_MS);
+		if (length != 0)
+			printf("Read data: %s\n", data);
+	}
+
+	vTaskDelete(NULL);
+}

part4_inputs_outputs/lab3_uart/readme.md

@@ -0,0 +1,294 @@
+# Visual Studio Code Template for ESP32
+
+## Prerequisites
+
+We consider that the Espressif IoT Development Framework (ESP-IDF), version 4.4.1, and Visual Studio Code environment is installed on the computer.
+For more details, see:  
+- https://docs.espressif.com/projects/esp-idf/en/v4.4.1/esp32/get-started/index.html#installation-step-by-step
+- https://code.visualstudio.com/
+
+As of VS-code v1.56.1 integrated terminals require additional configuration to work correctly. see https://code.visualstudio.com/docs/getstarted/settings#_settings-file-locations to edit the `setting.json` file and add the following entry:
+```bash
+"terminal.integrated.allowWorkspaceConfiguration":true
+```
+
+In Linux (from Ubuntu 20.x), on connecting an ESP32 board with a CP210x USB to serial converter, there is a problem of connection. Add the following entries below that disable both parts of the brltty service and allowed the ESP32 development boards to properly connect.
+```bash
+sudo systemctl stop brltty-udev.service
+sudo systemctl mask brltty-udev.service
+sudo systemctl stop brltty.service
+sudo systemctl disable brltty.service
+```
+Another solution is to uninstall brltty as below: 
+```bash
+sudo apt remove brltty
+```
+
+## Getting Started
+
+Firstly, you have to clone the `esp32-vscode-project-template` project and follow the next steps.
+```bash
+git clone https://github.com/fmuller-pns/esp32-vscode-project-template.git
+```
+
+#### 1. Rename the `vscode_project_template` folder
+```bash
+mv esp32-vscode-project-template <my_project_name>
+```
+#### 2. Go to the project directory
+```bash
+cd <my_project_name>
+```
+#### 3. Remove the GIT directory
+```bash
+rm -fR .git
+```
+#### 4. Open visual studio code for the new project
+```bash
+code .
+```
+#### 5. Verify paths in the `c_cpp_properties.json` file and change them if wrong.
+```json
+"IDF_TOOLS": "~/.espressif/tools",
+"IDF_PATH": "~/esp/esp-idf"
+```
+#### 6. [Not required] Change the default project name called `main` in files.
+This step renames the executable file. By default, the executable file is `main.elf`.
+1. Open `CMakeLists.txt` and replace `main` by <my_project_name>
+2. Open `Makefile` and replace `main` by <my_project_name>
+3. Open `.vscode/launch.json` and replace `main` by <my_project_name> (lines 11 and 19)
+
+#### 7. Open a terminal from Visual Studio Code to perform commands
+Choose an external or internal terminal.
+
+##### Open integrated terminal from Visual Studio Code
+
+  * using keyboard shortcut: `Ctrl+Shift+`<sup>2</sup>
+  * or pressing `F1` key and typing `integrated`
+
+##### Open external terminal from Visual Studio Code
+
+  * using keyboard shortcut: `Ctrl+Shift+C`
+  * or pressing `F1` key and typing `external`
+
+#### 8. Identify the USB serial port (usually `/dev/ttyUSB0`)
+```bash
+ls /dev/ttyUSB*
+```
+<span style="color:yellow">/dev/ttyUSB0</span>
+
+#### 9. Building, flashing and running project
+The serial port is `/dev/ttyUSB0` identified above.
+
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+
+##### Push the button on the ESP32 board when connecting
+
+```bash
+Serial port /dev/ttyUSB0
+Connecting........_____....._
+Detecting chip type... ESP32
+Chip is ESP32-PICO-D4 (revision 1)
+```
+
+##### Flashing and monitoring
+The message "`Hello ESP32 !`" appears.
+```bash
+...
+W (290) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
+I (300) cpu_start: Starting scheduler on PRO CPU.
+I (0) cpu_start: Starting scheduler on APP CPU.
+Hello ESP32 !
+```
+
+To exit monitoring, typing `Ctrl+AltGr+]`
+
+## Useful Commands 
+
+#### Open external terminal from vscode to perform commands
+
+  * using keyboard shortcut: `Ctrl+Shift+C`
+  * or pressing `F1` key and typing `external`
+
+#### Open integrated terminal from vscode to perform commands
+
+  * using keyboard shortcut: `Ctrl+Shift+`<sup>2</sup>
+  * or pressing `F1` key and typing `integrated`
+
+#### Clean project
+```bash
+idf.py fullclean
+```
+
+#### Configuration of the ESP32 board (only in external terminal)
+```bash
+idf.py menuconfig
+```
+
+#### Compile and build the executable file (`.elf` extension)
+```bash
+idf.py build
+```
+
+#### Identify the USB serial port (usually `/dev/ttyUSB0`)
+```bash
+ls /dev/ttyUSB*
+```
+
+#### Compile, build, flash
+```bash
+idf.py -p /dev/ttyUSB0 flash
+```
+
+#### Compile, build, flash and monitor
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+To exit monitoring, typing `Ctrl+AltGr+]`
+
+## Using Tasks for ESP32 to run, debug Project and so on
+
+1. In the menu, select `Run Task...`
+2. Select the task you want to launch:
+- `ESP32 - Build only`: just build the project
+- `ESP32 - Flash and Monitor`: build (when modifications of code), flash and monitor
+- `ESP32 - Clean Project`: Clean project (Full clean)
+- `ESP32 - OpenOCD with FT2232`: Run in dedicated terminal the openOCD command to debug the project
+- `ESP32 - Doxygen - HTML doc.`: Generate HTML documentation with Doxygen
+
+## Configure GIT for your new project
+
+#### Go to your new project folder
+```bash
+cd <project_name>
+```
+#### Configure name and email address
+```bash
+git config --global user.name "your name" 
+git config --global user.email "your email address"
+```
+#### Avoid typing your username and personal access token in vscode each time
+This is useful when connecting your GIT to GitHub.
+```bash
+git config credential.helper store
+```
+
+## Using GITHUB with visual studio code
+
+We consider you have followed the sections above:
+* Getting Started
+* Configure GIT for your new project
+
+Now, how to communicate with GitHub ?
+
+1. Open visual studio code.
+2. Click on the `Source Control` icon on your left side or use `Ctrl+Shift+G` shortcut. 
+3. For the first time, click on `Initialize Repository` button
+4. Enter a message for your first commit (ex: first commit) and click on Commit icon
+5. Press `F1` and typing `git add remote` and entering :
+   * *remote name* : your github repository previously created
+   * *remote url* : https://github.com/xxx/your_project.git
+   * *username* and *password*
+6. Push to the GitHub server (master branch)
+
+See https://code.visualstudio.com/docs/editor/versioncontrol for more details.
+
+## Debugging with JTAG FT2232
+
+You must install FTDI FT2232 driver.
+### Quick Driver installation for Linux:
+
+1. Install USB Driver
+```bash
+sudo apt-get install libusb-1.0
+$ lsusb
+Bus 001 Device 002: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC
+```
+2. Install OpenOCD rules. The path for rule copy can be different and depend on your ESP-IDF installation.
+```bash
+$ sudo usermod -a -G dialout $USER
+$ sudo usermod -a -G plugdev $USER
+$ sudo cp ~/.espressif/tools/openocd-esp32/v0.10.0-esp32-20210401/openocd-esp32/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d/
+$ sudo reboot
+```
+
+### Step 1: From external terminals
+
+1. Connect the ESP32 board (USB)
+2. Open an external terminal for building, flashing and running project
+The serial port is `/dev/ttyUSB0` identified above.
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+3. Connect the JTAG FT2232 (USB)
+4. Open another external terminal for running `openocd` with configuration file (`ftdi_ft2232.cfg`) located in the project root.
+```bash
+openocd -f ftdi_ft2232.cfg
+```
+
+5. Result on openocd terminal
+```bash
+Open On-Chip Debugger  v0.10.0-esp32-20190313 (2019-03-13-09:52)
+Licensed under GNU GPL v2
+adapter speed: 20000 kHz
+Info : Configured 2 cores
+esp32 interrupt mask on
+Info : Listening on port 6666 for tcl connections
+Info : Listening on port 4444 for telnet connections
+Info : ftdi: if you experience problems at higher adapter clocks, try the command "ftdi_tdo_sample_edge falling"
+Info : clock speed 20000 kHz
+Info : JTAG tap: esp32.cpu0 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
+Info : JTAG tap: esp32.cpu1 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
+Info : esp32: Debug controller 0 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Core 0 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Debug controller 1 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Core 1 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : Detected debug stubs @ 3ffb2950 on core0 of target 'esp32'
+Info : Listening on port 3333 for gdb connections
+```
+
+### Step 2: From Visual Studio Code
+1. Click on the left on the line you want to set a breakpoint. A red bullet appears.
+
+2. Click on debug Icon
+
+3. Click on RUN `ESP32 OpenOCD`. If an error arises, click again.
+
+4. The program stops at the breakpoint and you can see variables and more
+
+### Step 3: When you modify the code
+
+Do not touch the terminal with `openocd` command. 
+
+1. Stop the program into the terminal, typing `Ctrl+AltGr+]`
+2. Build, flash and run program
+The serial port is `/dev/ttyUSB0` identified above.
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+3. Click on RUN `ESP32 OpenOCD`. If an error arises, click again.
+4. The program stops at the breakpoint and you can see variables and more 
+
+## Generate Doxygen documentation
+
+You can use [Using Tasks for ESP32](#using-tasks-for-esp32-to-run-debug-project-and-so-on) or follow the steps below.
+
+1. Open external terminal from vscode, using keyboard shortcut: `Ctrl+Shift+C`, or pressing `F1` key and typing `external`
+2. Generate HTML documentation in `html_doc` folder
+
+  * From the User interface (allow you updating the `Doxyfile` configuration file)
+
+```bash
+doxywizard
+```
+
+  * Directly from `Doxyfile` configuration file
+
+
+```bash
+doxygen
+```
+3. A new `html` folder  is created, the entry file is `index.html`
+

part4_inputs_outputs/lab3_uart/sdkconfig.defaults

@@ -0,0 +1,3 @@
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE="4MB"
+

part4_inputs_outputs/lab4_app_photoresisor/.gitignore

@@ -0,0 +1,10 @@
+
+# Configuration files
+sdkconfig
+sdkconfig.old
+
+# Production folder
+build/
+
+# HTML documentation
+html_doc/

part4_inputs_outputs/lab4_app_photoresisor/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(main)

part4_inputs_outputs/lab4_app_photoresisor/Makefile

@@ -0,0 +1,3 @@
+PROJECT_NAME := main
+
+include $(IDF_PATH)/make/project.mk

part4_inputs_outputs/lab4_app_photoresisor/ftdi_ft2232.cfg

@@ -0,0 +1,22 @@
+interface ftdi
+ftdi_vid_pid 0x0403 0x6010
+ftdi_layout_init 0x0038 0x003b
+
+# The ESP32 only supports JTAG.
+transport select jtag
+
+# This can go as high as 20MHz if CPU frequency is 80MHz, or 26MHz
+# if CPU frequency is 160MHz or 240MHz.
+adapter_khz 20000
+
+# If single core debugging is required, uncomment the following line
+#set ESP32_ONLYCPU 1
+
+# To disable RTOS support, uncomment the following line
+# set ESP32_RTOS none
+
+# This option defaults to 3.3v
+set ESP32_FLASH_VOLTAGE 3.3
+
+# Source the ESP32 configuration file
+source [find target/esp32.cfg]

part4_inputs_outputs/lab4_app_photoresisor/main/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(
+            SRC_DIRS "." 
+            INCLUDE_DIRS ".")

part4_inputs_outputs/lab4_app_photoresisor/main/component.mk

@@ -0,0 +1,2 @@
+COMPONENT_SRCDIRS := .
+COMPONENT_ADD_INCLUDEDIRS := .

part4_inputs_outputs/lab4_app_photoresisor/main/main.c

@@ -0,0 +1,297 @@
+/****************************************************************************
+ * Copyright (C) 2021 by Fabrice Muller                                     *
+ *                                                                          *
+ * This file is useful for ESP32 Design course.                             *
+ *                                                                          *
+ ****************************************************************************/
+
+/**
+ * @file main.c
+ * @author Fabrice Muller
+ * @date 08 Nov. 2021
+ * @brief File containing the lab4 of Part 4.
+ *
+ * @see https://github.com/fmuller-pns/esp32-vscode-project-template
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "esp_log.h"
+
+#include "esp_intr_alloc.h"
+
+#include "freertos/FreeRTOSConfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+
+#include "my_helper_fct.h"
+
+#include "driver/uart.h"
+#include "driver/gpio.h"
+
+#include "driver/adc.h"
+#include "driver/adc_common.h"
+#include "esp_adc_cal.h"
+
+#include "driver/ledc.h"
+#include "soc/ledc_reg.h"
+
+static const char *TAG = "MAIN"; 
+
+/******************** ADC Declaration **********************/
+
+// Vref in mV
+#define DEFAULT_VREF    1100
+const adc_unit_t unit = ADC_UNIT_1;
+const adc_channel_t channel = ADC_CHANNEL_1;   
+const adc_bits_width_t width = ADC_WIDTH_BIT_10;
+const adc_atten_t atten = ADC_ATTEN_DB_11;
+ 
+
+
+
+
+/******************** UART Declaration **********************/
+// GPIO18 / IO18
+#define TXD_PIN 18
+// GPIO23 / IO23
+#define RXD_PIN 23
+// Not Connected
+#define RTS_PIN (UART_PIN_NO_CHANGE)
+// Not Connected
+#define CTS_PIN (UART_PIN_NO_CHANGE)
+
+#define UART_PORT_NUM      2
+#define UART_BAUD_RATE     115200
+
+QueueHandle_t uart_queue;
+
+#define BUF_SIZE (1024)
+static char data[BUF_SIZE];
+
+/******************** Task Declaration **********************/
+
+/* The tasks */
+void vUpdateLedTask(void *pvParameters);
+void vScanTask(void *pvParameters);
+
+/* LED constants */
+static const char * WHITE_LED_CMD = "WHITE";
+static const char * BLUE_LED_CMD = "BLUE";
+
+/**
+ * @brief Starting point function
+ * 
+ */
+
+void app_main(void) {
+
+	printf("Application - Photoresistance - IHM Node-RED\n");
+	
+    /* Configure parameters of the UART driver,
+     * communication pins and install the driver.
+     *
+     * Configuration: 115000 BAUDS, 8 BITS, No Parity, 1 STOP BIT, No Flow Control, APB CLK
+     */
+    uart_config_t uart_config = {
+        .baud_rate = UART_BAUD_RATE,   
+        .data_bits = 0x3,
+        .parity    = 0x0,
+        .stop_bits = 0x1,
+        .flow_ctrl = 0x0,
+        .source_clk = 0x0,
+    };
+
+    ESP_ERROR_CHECK(uart_driver_install(UART_PORT_NUM, BUF_SIZE * 2, BUF_SIZE * 2, 20, &uart_queue, 0));
+    ESP_ERROR_CHECK(uart_param_config(UART_PORT_NUM, &uart_config));
+    ESP_ERROR_CHECK(uart_set_pin(UART_PORT_NUM, TXD_PIN, RXD_PIN, RTS_PIN, CTS_PIN));
+
+    /* Configure ADC : ADC1, Channel 1, 10 bits, Attenuation 11dB */
+
+
+
+/* Configure ADC */
+	adc1_config_width(width);	
+   	adc1_config_channel_atten(channel, atten);
+
+
+    /* 
+    * LEDC Timer configuration
+    * Timer 0, Low speed mode, Auto clk, Résolution 10bits, Frequency 5 KHz
+    */
+    ledc_timer_config_t timer = {
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .duty_resolution = LEDC_TIMER_10_BIT,
+      .timer_num = LEDC_TIMER_0,
+      .freq_hz = 5000,
+      .clk_cfg = LEDC_AUTO_CLK};
+    ledc_timer_config(&timer);
+
+    /*
+    * Channel 0 configuration
+    * Timer 0, Channel 0, GPIO21 pin, Low speed mode
+    */
+    ledc_channel_config_t channel_0 = {
+      .gpio_num = 21,
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .channel = LEDC_CHANNEL_0,  
+      .timer_sel = LEDC_TIMER_0,
+      .duty = 0,    
+      .hpoint = 0
+      };
+    ledc_channel_config(&channel_0);
+
+    /*
+    * Channel 1 configuration
+    * Timer 0, Channel 1, GPIO22 pin, Low speed mode
+    */
+    ledc_channel_config_t channel_1 = {
+        .gpio_num = 22, 
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .channel = LEDC_CHANNEL_1,  
+        .timer_sel = LEDC_TIMER_0,
+        .duty = 0,
+        .hpoint = 0};
+    ledc_channel_config(&channel_1);    
+
+    esp_err_t result = ledc_fade_func_install(0);  // 0 : no interrupt
+    if (result != ESP_OK) {
+        printf("Error installing fade: %04x\n", result);  
+        return;
+    }
+
+    /* Create Tasks */
+
+xTaskCreatePinnedToCore(vUpdateLedTask, "UpdateTask", 4096, NULL, 2, NULL,CORE_1);
+xTaskCreatePinnedToCore(vScanTask, "UpdateTask", 4096, NULL, 2, NULL,CORE_0);
+
+
+    /* Delete Main task */
+	vTaskDelete(NULL);
+}
+
+void vScanTask(void *pvParameters){
+
+	esp_adc_cal_characteristics_t *adc_chars;
+
+	adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
+    esp_adc_cal_value_t val_type = esp_adc_cal_characterize(unit, atten, width, DEFAULT_VREF, adc_chars);
+    
+
+	uint16_t measuredValues;
+	int v;
+
+	for (;;) {
+
+		
+		/* Perform measure */
+		v = adc1_get_raw(channel);
+		measuredValues = esp_adc_cal_raw_to_voltage(v, adc_chars);
+
+		/* Print time conversion and voltage */
+		
+		printf("V = %d mV\n", measuredValues);
+
+// Send message 
+char text[100];
+sprintf(text, "%d\r\n", measuredValues);
+
+ // Write data back to the UART
+ 		int length = uart_write_bytes(UART_PORT_NUM, (const char *) text, strlen(text));
+        if (length == -1)
+            ESP_LOGE(TAG, "Error when writing in UART.");
+
+		/* Every second */
+		vTaskDelay(pdMS_TO_TICKS(1000));
+	}
+}
+
+void vUpdateLedTask(void *pvParameters) {
+
+    uart_event_t event;
+
+	for (;;) {
+		/* Wait for message with infinite timeout */
+        if(xQueueReceive(uart_queue, (void * )&event, (portTickType)portMAX_DELAY)) {
+			
+            switch(event.type) {
+                // Event of received data
+                case UART_DATA:
+                    uart_read_bytes(UART_PORT_NUM, data, event.size, portMAX_DELAY);
+                    DISPLAY("[UART DATA]: %.*s", event.size, data);
+
+                    data[event.size] = 0;   // Be sure the last character in NULL (end of string)
+                    int cmp_length;
+                    char *ptr;
+
+                    /* Extract Value */
+                    char *str_value = strrchr(data, ':');
+                    if (str_value != NULL)
+                        cmp_length = event.size - strlen(str_value);
+                    else {
+                        DISPLAYE(TAG, "[UART DATA]: Format Error");
+                        continue;
+                    }
+                    uint32_t value = strtoul((str_value+1), &ptr, 10);
+
+                    /* duty cycle according to the color LED */
+                    if (strncmp(WHITE_LED_CMD, data, cmp_length) == 0) {
+                        
+
+
+                    }
+                    else if (strncmp(BLUE_LED_CMD, data, cmp_length) == 0) {
+                        
+
+
+                    }
+                    break;
+
+                // Event of HW FIFO overflow detected
+                case UART_FIFO_OVF:
+                    DISPLAYE(TAG, "hw fifo overflow");
+                    uart_flush_input(UART_PORT_NUM);
+                    xQueueReset(uart_queue);
+                    break;
+
+                // Event of UART ring buffer full
+                case UART_BUFFER_FULL:
+                    ESP_LOGI(TAG, "ring buffer full");
+                    uart_flush_input(UART_PORT_NUM);
+                    xQueueReset(uart_queue);
+                    break;
+
+                //Event of UART RX break detected
+                case UART_BREAK:
+                    DISPLAYE(TAG, "uart rx break");
+                    break;
+                //Event of UART parity check error
+                case UART_PARITY_ERR:
+                    DISPLAYE(TAG, "uart parity error");
+                    break;
+                //Event of UART frame error
+                case UART_FRAME_ERR:
+                    DISPLAYE(TAG, "uart frame error");
+                    break;
+                //UART_PATTERN_DET
+                case UART_PATTERN_DET:
+                    DISPLAYW(TAG, "uart pattern detected");
+                    break;
+                //Others
+                default:
+                    DISPLAYW(TAG, "uart event type: %d", event.type);
+                    break;
+            }
+    	}
+	}
+
+    vTaskDelete(NULL);  
+}
+
+
+
+
+

part4_inputs_outputs/lab4_app_photoresisor/main/my_helper_fct.h

@@ -0,0 +1,47 @@
+#ifndef _MY_HELPER_FCT_
+#define _MY_HELPER_FCT_
+
+#include <unistd.h>
+#include "esp_log.h"
+
+
+/* Core constants fot xTaskCreatePinnedToCore() function */
+const uint32_t CORE_0 = 0;
+const uint32_t CORE_1 = 1;
+const uint32_t PRO_CPU = 0;
+const uint32_t APP_CPU = 1;
+
+/**
+ * @brief Macro to display the buffer with arguments. msg is a formatted string as printf() function.
+ * 
+ */
+#define DISPLAY(msg, ...) printf("%d:%d>\t"msg"\r\n", xTaskGetTickCount(), xPortGetCoreID(), ##__VA_ARGS__);
+
+
+/**
+ * @brief Macro to display error/warning/info for the buffer with arguments. msg is a formatted string as printf() function.
+ * 
+ */
+#define DISPLAYE(tag, msg, ...) ESP_LOGE(tag, "%d:%d>\t"msg"", xTaskGetTickCount(), xPortGetCoreID(), ##__VA_ARGS__);
+
+#define DISPLAYW(tag, msg, ...) ESP_LOGW(tag, "%d:%d>\t"msg"", xTaskGetTickCount(), xPortGetCoreID(), ##__VA_ARGS__);
+
+#define DISPLAYI(tag, msg, ...) ESP_LOGI(tag, "%d:%d>\t"msg"", xTaskGetTickCount(), xPortGetCoreID(), ##__VA_ARGS__);
+
+/**
+ * @brief Macro to display the buffer without argument
+ * 
+ */
+#define DISPLAYB(msg) printf("%d:%d>\t", xTaskGetTickCount(), xPortGetCoreID());\
+	printf(msg);\
+	printf("\r\n");
+
+
+/* Consume CPU cycles. Time parameter is for the default frequency: 160MHz (ESP32_DEFAULT_CPU_FREQ_MHZ=160) */
+#define COMPUTE_IN_TIME_US(time_us) {register uint32_t i=(uint32_t)time_us*5.02*100/22; while (i-- > 0) {asm(" nop");}}
+
+#define COMPUTE_IN_TIME_MS(time_ms) {register uint32_t i=(uint32_t)time_ms*1000*5.02*100/22; while (i-- > 0) {asm(" nop");}} 
+
+#define COMPUTE_IN_TICK(tick) {register uint32_t i=(uint32_t)(tick*1000/configTICK_RATE_HZ)*1000*5.02*100/22; while (i-- > 0) {asm(" nop");}} 
+
+#endif

part4_inputs_outputs/lab4_app_photoresisor/readme.md

@@ -0,0 +1,294 @@
+# Visual Studio Code Template for ESP32
+
+## Prerequisites
+
+We consider that the Espressif IoT Development Framework (ESP-IDF), version 4.4.1, and Visual Studio Code environment is installed on the computer.
+For more details, see:  
+- https://docs.espressif.com/projects/esp-idf/en/v4.4.1/esp32/get-started/index.html#installation-step-by-step
+- https://code.visualstudio.com/
+
+As of VS-code v1.56.1 integrated terminals require additional configuration to work correctly. see https://code.visualstudio.com/docs/getstarted/settings#_settings-file-locations to edit the `setting.json` file and add the following entry:
+```bash
+"terminal.integrated.allowWorkspaceConfiguration":true
+```
+
+In Linux (from Ubuntu 20.x), on connecting an ESP32 board with a CP210x USB to serial converter, there is a problem of connection. Add the following entries below that disable both parts of the brltty service and allowed the ESP32 development boards to properly connect.
+```bash
+sudo systemctl stop brltty-udev.service
+sudo systemctl mask brltty-udev.service
+sudo systemctl stop brltty.service
+sudo systemctl disable brltty.service
+```
+Another solution is to uninstall brltty as below: 
+```bash
+sudo apt remove brltty
+```
+
+## Getting Started
+
+Firstly, you have to clone the `esp32-vscode-project-template` project and follow the next steps.
+```bash
+git clone https://github.com/fmuller-pns/esp32-vscode-project-template.git
+```
+
+#### 1. Rename the `vscode_project_template` folder
+```bash
+mv esp32-vscode-project-template <my_project_name>
+```
+#### 2. Go to the project directory
+```bash
+cd <my_project_name>
+```
+#### 3. Remove the GIT directory
+```bash
+rm -fR .git
+```
+#### 4. Open visual studio code for the new project
+```bash
+code .
+```
+#### 5. Verify paths in the `c_cpp_properties.json` file and change them if wrong.
+```json
+"IDF_TOOLS": "~/.espressif/tools",
+"IDF_PATH": "~/esp/esp-idf"
+```
+#### 6. [Not required] Change the default project name called `main` in files.
+This step renames the executable file. By default, the executable file is `main.elf`.
+1. Open `CMakeLists.txt` and replace `main` by <my_project_name>
+2. Open `Makefile` and replace `main` by <my_project_name>
+3. Open `.vscode/launch.json` and replace `main` by <my_project_name> (lines 11 and 19)
+
+#### 7. Open a terminal from Visual Studio Code to perform commands
+Choose an external or internal terminal.
+
+##### Open integrated terminal from Visual Studio Code
+
+  * using keyboard shortcut: `Ctrl+Shift+`<sup>2</sup>
+  * or pressing `F1` key and typing `integrated`
+
+##### Open external terminal from Visual Studio Code
+
+  * using keyboard shortcut: `Ctrl+Shift+C`
+  * or pressing `F1` key and typing `external`
+
+#### 8. Identify the USB serial port (usually `/dev/ttyUSB0`)
+```bash
+ls /dev/ttyUSB*
+```
+<span style="color:yellow">/dev/ttyUSB0</span>
+
+#### 9. Building, flashing and running project
+The serial port is `/dev/ttyUSB0` identified above.
+
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+
+##### Push the button on the ESP32 board when connecting
+
+```bash
+Serial port /dev/ttyUSB0
+Connecting........_____....._
+Detecting chip type... ESP32
+Chip is ESP32-PICO-D4 (revision 1)
+```
+
+##### Flashing and monitoring
+The message "`Hello ESP32 !`" appears.
+```bash
+...
+W (290) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
+I (300) cpu_start: Starting scheduler on PRO CPU.
+I (0) cpu_start: Starting scheduler on APP CPU.
+Hello ESP32 !
+```
+
+To exit monitoring, typing `Ctrl+AltGr+]`
+
+## Useful Commands 
+
+#### Open external terminal from vscode to perform commands
+
+  * using keyboard shortcut: `Ctrl+Shift+C`
+  * or pressing `F1` key and typing `external`
+
+#### Open integrated terminal from vscode to perform commands
+
+  * using keyboard shortcut: `Ctrl+Shift+`<sup>2</sup>
+  * or pressing `F1` key and typing `integrated`
+
+#### Clean project
+```bash
+idf.py fullclean
+```
+
+#### Configuration of the ESP32 board (only in external terminal)
+```bash
+idf.py menuconfig
+```
+
+#### Compile and build the executable file (`.elf` extension)
+```bash
+idf.py build
+```
+
+#### Identify the USB serial port (usually `/dev/ttyUSB0`)
+```bash
+ls /dev/ttyUSB*
+```
+
+#### Compile, build, flash
+```bash
+idf.py -p /dev/ttyUSB0 flash
+```
+
+#### Compile, build, flash and monitor
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+To exit monitoring, typing `Ctrl+AltGr+]`
+
+## Using Tasks for ESP32 to run, debug Project and so on
+
+1. In the menu, select `Run Task...`
+2. Select the task you want to launch:
+- `ESP32 - Build only`: just build the project
+- `ESP32 - Flash and Monitor`: build (when modifications of code), flash and monitor
+- `ESP32 - Clean Project`: Clean project (Full clean)
+- `ESP32 - OpenOCD with FT2232`: Run in dedicated terminal the openOCD command to debug the project
+- `ESP32 - Doxygen - HTML doc.`: Generate HTML documentation with Doxygen
+
+## Configure GIT for your new project
+
+#### Go to your new project folder
+```bash
+cd <project_name>
+```
+#### Configure name and email address
+```bash
+git config --global user.name "your name" 
+git config --global user.email "your email address"
+```
+#### Avoid typing your username and personal access token in vscode each time
+This is useful when connecting your GIT to GitHub.
+```bash
+git config credential.helper store
+```
+
+## Using GITHUB with visual studio code
+
+We consider you have followed the sections above:
+* Getting Started
+* Configure GIT for your new project
+
+Now, how to communicate with GitHub ?
+
+1. Open visual studio code.
+2. Click on the `Source Control` icon on your left side or use `Ctrl+Shift+G` shortcut. 
+3. For the first time, click on `Initialize Repository` button
+4. Enter a message for your first commit (ex: first commit) and click on Commit icon
+5. Press `F1` and typing `git add remote` and entering :
+   * *remote name* : your github repository previously created
+   * *remote url* : https://github.com/xxx/your_project.git
+   * *username* and *password*
+6. Push to the GitHub server (master branch)
+
+See https://code.visualstudio.com/docs/editor/versioncontrol for more details.
+
+## Debugging with JTAG FT2232
+
+You must install FTDI FT2232 driver.
+### Quick Driver installation for Linux:
+
+1. Install USB Driver
+```bash
+sudo apt-get install libusb-1.0
+$ lsusb
+Bus 001 Device 002: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC
+```
+2. Install OpenOCD rules. The path for rule copy can be different and depend on your ESP-IDF installation.
+```bash
+$ sudo usermod -a -G dialout $USER
+$ sudo usermod -a -G plugdev $USER
+$ sudo cp ~/.espressif/tools/openocd-esp32/v0.10.0-esp32-20210401/openocd-esp32/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d/
+$ sudo reboot
+```
+
+### Step 1: From external terminals
+
+1. Connect the ESP32 board (USB)
+2. Open an external terminal for building, flashing and running project
+The serial port is `/dev/ttyUSB0` identified above.
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+3. Connect the JTAG FT2232 (USB)
+4. Open another external terminal for running `openocd` with configuration file (`ftdi_ft2232.cfg`) located in the project root.
+```bash
+openocd -f ftdi_ft2232.cfg
+```
+
+5. Result on openocd terminal
+```bash
+Open On-Chip Debugger  v0.10.0-esp32-20190313 (2019-03-13-09:52)
+Licensed under GNU GPL v2
+adapter speed: 20000 kHz
+Info : Configured 2 cores
+esp32 interrupt mask on
+Info : Listening on port 6666 for tcl connections
+Info : Listening on port 4444 for telnet connections
+Info : ftdi: if you experience problems at higher adapter clocks, try the command "ftdi_tdo_sample_edge falling"
+Info : clock speed 20000 kHz
+Info : JTAG tap: esp32.cpu0 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
+Info : JTAG tap: esp32.cpu1 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
+Info : esp32: Debug controller 0 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Core 0 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Debug controller 1 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : esp32: Core 1 was reset (pwrstat=0x5F, after clear 0x0F).
+Info : Detected debug stubs @ 3ffb2950 on core0 of target 'esp32'
+Info : Listening on port 3333 for gdb connections
+```
+
+### Step 2: From Visual Studio Code
+1. Click on the left on the line you want to set a breakpoint. A red bullet appears.
+
+2. Click on debug Icon
+
+3. Click on RUN `ESP32 OpenOCD`. If an error arises, click again.
+
+4. The program stops at the breakpoint and you can see variables and more
+
+### Step 3: When you modify the code
+
+Do not touch the terminal with `openocd` command. 
+
+1. Stop the program into the terminal, typing `Ctrl+AltGr+]`
+2. Build, flash and run program
+The serial port is `/dev/ttyUSB0` identified above.
+```bash
+idf.py -p /dev/ttyUSB0 flash monitor
+```
+3. Click on RUN `ESP32 OpenOCD`. If an error arises, click again.
+4. The program stops at the breakpoint and you can see variables and more 
+
+## Generate Doxygen documentation
+
+You can use [Using Tasks for ESP32](#using-tasks-for-esp32-to-run-debug-project-and-so-on) or follow the steps below.
+
+1. Open external terminal from vscode, using keyboard shortcut: `Ctrl+Shift+C`, or pressing `F1` key and typing `external`
+2. Generate HTML documentation in `html_doc` folder
+
+  * From the User interface (allow you updating the `Doxyfile` configuration file)
+
+```bash
+doxywizard
+```
+
+  * Directly from `Doxyfile` configuration file
+
+
+```bash
+doxygen
+```
+3. A new `html` folder  is created, the entry file is `index.html`
+

part4_inputs_outputs/lab4_app_photoresisor/sdkconfig.defaults

@@ -0,0 +1,3 @@
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE="4MB"
+