143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
#include "mfrc522.h"
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#include "driver/gpio.h"
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#include "esp_log.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include <stdlib.h>
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#include <string.h>
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static const char *TAG = "MFRC522";
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#define SPI_MASTER_FREQ_HZ 1000000 // 1MHz
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mfrc522_handle_t* mfrc522_init(int sck_pin, int mosi_pin, int miso_pin, int cs_pin, int rst_pin)
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{
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mfrc522_handle_t *handle = (mfrc522_handle_t *)malloc(sizeof(mfrc522_handle_t));
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if (!handle) {
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ESP_LOGE(TAG, "Failed to allocate memory");
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return NULL;
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}
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// 配置 RST 引脚
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gpio_config_t io_conf = {
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.pin_bit_mask = (1ULL << rst_pin),
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.mode = GPIO_MODE_OUTPUT,
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.pull_up_en = GPIO_PULLUP_DISABLE,
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.pull_down_en = GPIO_PULLDOWN_DISABLE,
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.intr_type = GPIO_INTR_DISABLE
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};
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gpio_config(&io_conf);
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gpio_set_level(rst_pin, 1);
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// 配置 SPI
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spi_bus_config_t buscfg = {
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.miso_io_num = miso_pin,
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.mosi_io_num = mosi_pin,
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.sclk_io_num = sck_pin,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1,
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.max_transfer_sz = 4096,
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};
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spi_device_interface_config_t devcfg = {
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.mode = 0,
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.clock_speed_hz = SPI_MASTER_FREQ_HZ,
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.spics_io_num = cs_pin,
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.queue_size = 7,
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};
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esp_err_t ret = spi_bus_initialize(HSPI_HOST, &buscfg, SPI_DMA_CH_AUTO);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to initialize SPI bus");
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free(handle);
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return NULL;
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}
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ret = spi_bus_add_device(HSPI_HOST, &devcfg, &handle->spi);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to add SPI device");
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free(handle);
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return NULL;
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}
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handle->uid_len = 0;
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memset(handle->uid, 0, sizeof(handle->uid));
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// 复位 MFRC522
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mfrc522_reset(handle);
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ESP_LOGI(TAG, "MFRC522 initialized successfully");
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return handle;
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}
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void mfrc522_reset(mfrc522_handle_t *handle)
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{
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mfrc522_write_reg(handle, MFRC522_REG_COMMAND, MFRC522_CMD_RESETPHASE);
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vTaskDelay(pdMS_TO_TICKS(50));
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// 初始化寄存器
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mfrc522_write_reg(handle, MFRC522_REG_MODE, 0x3D); // CRC初始值
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mfrc522_write_reg(handle, MFRC522_REG_TX_CONTROL, 0x83); // 打开TX1和TX2输出
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mfrc522_write_reg(handle, MFRC522_REG_TX_AUTO, 0x40); // 自动 RF 开启
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mfrc522_write_reg(handle, MFRC522_REG_COMMAND, MFRC522_CMD_IDLE);
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}
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void mfrc522_write_reg(mfrc522_handle_t *handle, uint8_t reg, uint8_t val)
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{
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uint8_t tx_data[2];
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tx_data[0] = ((reg << 1) & 0x7E) | 0x00; // 写操作
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tx_data[1] = val;
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spi_transaction_t t = {
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.length = 16,
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.tx_buffer = tx_data,
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};
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spi_device_transmit(handle->spi, &t);
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}
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uint8_t mfrc522_read_reg(mfrc522_handle_t *handle, uint8_t reg)
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{
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uint8_t tx_data[2] = {0};
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uint8_t rx_data[2] = {0};
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tx_data[0] = ((reg << 1) & 0x7E) | 0x80; // 读操作
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spi_transaction_t t = {
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.length = 16,
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.tx_buffer = tx_data,
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.rx_buffer = rx_data,
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};
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spi_device_transmit(handle->spi, &t);
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return rx_data[1];
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}
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uint8_t mfrc522_picc_is_new(mfrc522_handle_t *handle)
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{
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uint8_t status = mfrc522_read_reg(handle, MFRC522_REG_STATUS1);
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return (status & 0x01); // 检查标签检测位
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}
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uint8_t mfrc522_picc_read_serial(mfrc522_handle_t *handle)
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{
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// 这是一个简化版本，实际实现需要完整的 Mifare 协议
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// 这里仅作示例
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handle->uid_len = 4;
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return handle->uid_len;
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}
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void mfrc522_picc_halt_a(mfrc522_handle_t *handle)
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{
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mfrc522_write_reg(handle, MFRC522_REG_COMMAND, MFRC522_CMD_IDLE);
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}
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void mfrc522_deinit(mfrc522_handle_t *handle)
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{
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if (handle) {
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spi_bus_remove_device(handle->spi);
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spi_bus_free(HSPI_HOST);
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free(handle);
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}
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}
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