stm32l431rc与stm32l431CC区别

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。 ```c #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： ```c 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。

对于STM32F103RC小车的声音定位代码，以下是一个简单的示例，你可以根据自己的需求进行修改和扩展： ```c #include "stm32f10x.h" #include "stdio.h" #define SOUND_SPEED 343 // 声音在空气中传播的速度，单位为m/s void TIM3_IRQHandler(void) { static uint32_t risingEdgeTime = 0; static uint32_t fallingEdgeTime = 0; static uint8_t captureState = 0; if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET) { if (captureState == 0) { // 获取上升沿时间 risingEdgeTime = TIM_GetCapture1(TIM3); captureState = 1; } else if (captureState == 1) { // 获取下降沿时间 fallingEdgeTime = TIM_GetCapture1(TIM3); captureState = 0; // 计算声音传播时间 uint32_t soundTravelTime = fallingEdgeTime - risingEdgeTime; // 计算距离 float distance = (float)soundTravelTime * SOUND_SPEED / (2 * SystemCoreClock); printf("Distance: %.2f m\r\n", distance); } TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); } } int main(void) { // 初始化GPIO和TIM3 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = 0xFFFF; // 最大计数值 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_ICInitTypeDef TIM_ICInitStructure; TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStructure.TIM_ICFilter = 0x0; TIM_ICInit(TIM3, &TIM_ICInitStructure); NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE); TIM_Cmd(TIM3, ENABLE); printf("Sound localization started.\r\n"); while (1) { // 主循环中可以进行其他操作 } } ``` 这段代码使用了STM32F103RC的TIM3模块来测量声音的传播时间，并通过计算距离实现声音定位功能。代码中使用PA6引脚作为输入捕获通道，通过捕获上升沿和下降沿的时间差来计算声音传播时间，进而得到距离。 需要注意的是，此代码只是一个简单的示例，实际应用中可能需要考虑更多的因素，例如噪声、多径效应等。你可以根据具体情况进行修改和优化。