part4

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);
+}