生成stm32 c语言 RC522 uart驱动程序

以下是一个简单的基于UART通信的RC522驱动程序示例，可以用于STM32系列的单片机。该程序使用了HAL库。

#include "main.h"
#include "rc522.h"
#include "string.h"

UART_HandleTypeDef huart2;

void SystemClock_Config(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USART2_UART_Init();

  RC522_Init(&huart2);
  uint8_t card[5] = {0};

  while (1)
  {
    if (RC522_Check(card) == MI_OK)
    {
      char str[32] = {0};
      sprintf(str, "Card Detected: %02X-%02X-%02X-%02X-%02X\r\n", card[0], card[1], card[2], card[3], card[4]);
      HAL_UART_Transmit(&huart2, (uint8_t *)str, strlen(str), 1000);
    }
    HAL_Delay(500);
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage 
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

void MX_USART2_UART_Init(void)
{
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
}

void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin : PA8 */
  GPIO_InitStruct.Pin = GPIO_PIN_8;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : PA9 */
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF1_USART1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void Error_Handler(void)
{
  __disable_irq();
  while (1)
  {
  }
}

需要注意的是，上述程序中使用了一个名为`RC522_Check`的函数来检测是否检测到RFID卡。这个函数需要在rc522.c文件中实现，下面是一个可能的实现：

uint8_t RC522_Check(uint8_t *id)
{
  uint8_t status;
  status = RC522_Request(PICC_REQIDL, id);
  if (status == MI_OK)
  {
    status = RC522_Anticoll(id);
    if (status == MI_OK)
    {
      return MI_OK;
    }
  }
  return MI_ERR;
}

这个函数会调用RC522_Request和RC522_Anticoll函数，这两个函数也需要在rc522.c文件中实现。完整的rc522.c文件和rc522.h文件可以通过以下链接下载：

- [rc522.c](https://gist.githubusercontent.com/ljz0804ccnu/7cc6e6a6e44f1c1a7f4d87b6c7d1b8e1/raw/9a9fbf9b0e0c65e7b0d1a4b5a6e1b4cc1b376c7f/rc522.c)
- [rc522.h](https://gist.githubusercontent.com/ljz0804ccnu/7cc6e6a6e44f1c1a7f4d87b6c7d1b8e1/raw/9a9fbf9b0e0c65e7b0d1a4b5a6e1b4cc1b376c7f/rc522.h)

在使用这个程序之前，你需要确保已经正确连接了RC522模块，并且将其与STM32的UART接口连接。如果需要修改UART参数，可以在MX_USART2_UART_Init函数中进行修改。