RC522

RC522是一种RFID读写模块，它可以通过射频识别技术实现对RFID标签的读写操作。以下是使用RC522模块进行读取操作的示例代码：

#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#include "mfrc522.h"

static const char *TAG = "rc522";

void rc522_task(void *pvParameter)
{
    ESP_LOGI(TAG, "RC522 task started");

    spi_device_handle_t spi;
    spi_bus_config_t buscfg = {
        .miso_io_num = PIN_NUM_MISO,
        .mosi_io_num = PIN_NUM_MOSI,
        .sclk_io_num = PIN_NUM_CLK,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = MFRC522_MAX_LEN
    };
    spi_device_interface_config_t devcfg = {
        .clock_speed_hz = 5000000,
        .mode = 0,
        .spics_io_num = PIN_NUM_CS,
        .queue_size = 7
    };
    esp_err_t ret;
    ret = spi_bus_initialize(HSPI_HOST, &buscfg, 1);
    assert(ret == ESP_OK);
    ret = spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
    assert(ret == ESP_OK);

    mfrc522_init(spi);

    while (1) {
        uint8_t uid[MFRC522_MAX_LEN];
        uint8_t uid_len = sizeof(uid);
        if (mfrc522_request(spi, PICC_REQIDL, uid, &uid_len) == MFRC522_STATUS_OK) {
            ESP_LOGI(TAG, "Card detected");
            if (mfrc522_get_card_type(uid[0]) == MFRC522_CARDTYPE_MIFARE1K) {
                ESP_LOGI(TAG, "Card type: MIFARE 1K");
                uint8_t key[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
                uint8_t sector = 1;
                uint8_t block = 4;
                if (mfrc522_authenticate(spi, PICC_AUTHENT1A, sector, key, uid, uid_len) == MFRC522_STATUS_OK) {
                    uint8_t data[MFRC522_BLOCK_SIZE];
                    if (mfrc522_read_block(spi, sector * 4 + block, data) == MFRC522_STATUS_OK) {
                        ESP_LOGI(TAG, "Block %d data: %s", sector * 4 + block, data);
                    } else {
                        ESP_LOGE(TAG, "Read block failed");
                    }
                } else {
                    ESP_LOGE(TAG, "Authenticate failed");
                }
            } else {
                ESP_LOGE(TAG, "Unsupported card type");
            }
        }
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

void app_main()
{
    xTaskCreate(rc522_task, "rc522_task", 2048, NULL, 10, NULL);
}

这个示例代码使用ESP32的HSPI接口与RC522模块进行通信，并且可以读取MIFARE 1K标签的数据。可以根据需要修改代码以实现其他操作。需要注意的是，RC522模块的接线需要参考其数据手册进行，以确保正确连接。