esp-idf/examples/peripherals/i2c/i2c_tools/main/i2ctools_example_main.c

/* i2c-tools example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <stdio.h>
#include <string.h>
#include "esp_system.h"
#include "esp_log.h"
#include "esp_console.h"
#include "esp_vfs_dev.h"
#include "driver/uart.h"
#include "linenoise/linenoise.h"
#include "argtable3/argtable3.h"
#include "cmd_decl.h"
#include "esp_vfs_fat.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "sdkconfig.h"

static const char *TAG = "i2c-tools";

#if CONFIG_STORE_HISTORY

#define MOUNT_PATH "/data"
#define HISTORY_PATH MOUNT_PATH "/history.txt"

static void initialize_filesystem()
{
    static wl_handle_t wl_handle;
    const esp_vfs_fat_mount_config_t mount_config = {
        .max_files = 4,
        .format_if_mount_failed = true
    };
    esp_err_t err = esp_vfs_fat_spiflash_mount(MOUNT_PATH, "storage", &mount_config, &wl_handle);
    if (err != ESP_OK) {
        ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
        return;
    }
}
#endif // CONFIG_STORE_HISTORY

static void initialize_nvs()
{
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        err = nvs_flash_init();
    }
    ESP_ERROR_CHECK(err);
}

static void initialize_console()
{
    /* Disable buffering on stdin */
    setvbuf(stdin, NULL, _IONBF, 0);

    /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
    esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);
    /* Move the caret to the beginning of the next line on '\n' */
    esp_vfs_dev_uart_set_tx_line_endings(ESP_LINE_ENDINGS_CRLF);

    /* Configure UART. Note that REF_TICK is used so that the baud rate remains
     * correct while APB frequency is changing in light sleep mode.
     */
    const uart_config_t uart_config = {
        .baud_rate = CONFIG_CONSOLE_UART_BAUDRATE,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .use_ref_tick = true
    };
    ESP_ERROR_CHECK(uart_param_config(CONFIG_CONSOLE_UART_NUM, &uart_config));

    /* Install UART driver for interrupt-driven reads and writes */
    ESP_ERROR_CHECK(uart_driver_install(CONFIG_CONSOLE_UART_NUM,
                                        256, 0, 0, NULL, 0));

    /* Tell VFS to use UART driver */
    esp_vfs_dev_uart_use_driver(CONFIG_CONSOLE_UART_NUM);

    /* Initialize the console */
    esp_console_config_t console_config = {
        .max_cmdline_args = 8,
        .max_cmdline_length = 256,
#if CONFIG_LOG_COLORS
        .hint_color = atoi(LOG_COLOR_CYAN)
#endif
    };
    ESP_ERROR_CHECK(esp_console_init(&console_config));

    /* Configure linenoise line completion library */
    linenoiseSetMultiLine(1);

    /* Tell linenoise where to get command completions and hints */
    linenoiseSetCompletionCallback(&esp_console_get_completion);
    linenoiseSetHintsCallback((linenoiseHintsCallback *)&esp_console_get_hint);

    /* Set command history size */
    linenoiseHistorySetMaxLen(100);

#if CONFIG_STORE_HISTORY
    /* Load command history from filesystem */
    linenoiseHistoryLoad(HISTORY_PATH);
#endif
}

void app_main()
{
    initialize_nvs();

#if CONFIG_STORE_HISTORY
    initialize_filesystem();
#endif

    initialize_console();

    /* Register commands */
    esp_console_register_help_command();
    register_i2ctools();
    register_system();

    /* Prompt to be printed before each line.
     * This can be customized, made dynamic, etc.
     */
    const char *prompt = LOG_COLOR_I "esp32> " LOG_RESET_COLOR;

    printf("\n ==============================================================\n");
    printf(" |       Steps to Use i2c-tools on ESP32                      |\n");
    printf(" |                                                            |\n");
    printf(" |  1. Try 'help', check all supported commands               |\n");
    printf(" |  2. Try 'i2cconfig' to configure your I2C bus              |\n");
    printf(" |  3. Try 'i2cdetect' to scan devices on the bus             |\n");
    printf(" |  4. Try 'i2cget' to get the content of specific register   |\n");
    printf(" |  5. Try 'i2cset' to set the value of specific register     |\n");
    printf(" |  6. Try 'i2cdump' to dump all the register (Experiment)    |\n");
    printf(" |                                                            |\n");
    printf(" ==============================================================\n\n");

    /* Figure out if the terminal supports escape sequences */
    int probe_status = linenoiseProbe();
    if (probe_status) {
        /* zero indicates success */
        printf("\n"
               "Your terminal application does not support escape sequences.\n"
               "Line editing and history features are disabled.\n"
               "On Windows, try using Putty instead.\n");
        linenoiseSetDumbMode(1);
#if CONFIG_LOG_COLORS
        /* Since the terminal doesn't support escape sequences,
         * don't use color codes in the prompt.
         */
        prompt = "esp32> ";
#endif //CONFIG_LOG_COLORS
    }

    /* Main loop */
    while (true) {
        /* Get a line using linenoise.
         * The line is returned when ENTER is pressed.
         */
        char *line = linenoise(prompt);
        if (line == NULL) {
            /* Ignore empty lines */
            continue;
        }
        /* Add the command to the history */
        linenoiseHistoryAdd(line);
#if CONFIG_STORE_HISTORY
        /* Save command history to filesystem */
        linenoiseHistorySave(HISTORY_PATH);
#endif

        /* Try to run the command */
        int ret;
        esp_err_t err = esp_console_run(line, &ret);
        if (err == ESP_ERR_NOT_FOUND) {
            printf("Unrecognized command\n");
        } else if (err == ESP_ERR_INVALID_ARG) {
            // command was empty
        } else if (err == ESP_OK && ret != ESP_OK) {
            printf("Command returned non-zero error code: 0x%x (%s)\n", ret, esp_err_to_name(err));
        } else if (err != ESP_OK) {
            printf("Internal error: %s\n", esp_err_to_name(err));
        }
        /* linenoise allocates line buffer on the heap, so need to free it */
        linenoiseFree(line);
    }
}