void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { UNUSED(huart); if(huart->Instance ==USART3) { RxBuffer[Rxcouter++] = Res; state=3; HAL_UART_Receive_IT(&huart3, (uint8_t *)&Res, 1); } }

根据你提供的代码，HAL_UART_RxCpltCallback 函数是用于串口接收完成中断的回调函数。在这个函数中，首先使用 UNUSED 宏来消除编译器对未使用的参数的警告。

接下来，通过判断 huart->Instance 是否等于 USART3，确定是对 USART3 串口的接收完成中断的处理。在这个判断条件下，将接收到的数据 Res 存储到 RxBuffer 数组中，并对 state 进行相应的操作。

最后，通过调用 HAL_UART_Receive_IT 函数再次启动 USART3 串口的中断接收。

需要注意的是，这段代码中的变量 Rxcouter 和 state 需要在其他地方进行定义和初始化，以及确保 USART3 的相关配置和初始化已经完成。此外，你可能还需要在主函数中使用 HAL_UART_Receive_IT 函数启动 USART3 的中断接收。

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HAL_StatusTypeDef HAL_UART_Init(UART_HandleTypeDef *huart) { /* Check the UART handle allocation */ if (huart == NULL) { return HAL_ERROR; } /* Check the parameters */ if (huart->Init.HwFlowCtl != UART_HWCONTROL_NONE) { /* The hardware flow control is available only for USART1, USART2, USART3 and USART6. Except for STM32F446xx devices, that is available for USART1, USART2, USART3, USART6, UART4 and UART5. */ assert_param(IS_UART_HWFLOW_INSTANCE(huart->Instance)); assert_param(IS_UART_HARDWARE_FLOW_CONTROL(huart->Init.HwFlowCtl)); } else { assert_param(IS_UART_INSTANCE(huart->Instance)); } assert_param(IS_UART_WORD_LENGTH(huart->Init.WordLength)); assert_param(IS_UART_OVERSAMPLING(huart->Init.OverSampling)); if (huart->gState == HAL_UART_STATE_RESET) { /* Allocate lock resource and initialize it */ huart->Lock = HAL_UNLOCKED; #if (USE_HAL_UART_REGISTER_CALLBACKS == 1) UART_InitCallbacksToDefault(huart); if (huart->MspInitCallback == NULL) { huart->MspInitCallback = HAL_UART_MspInit; } /* Init the low level hardware */ huart->MspInitCallback(huart); #else /* Init the low level hardware : GPIO, CLOCK */ HAL_UART_MspInit(huart); #endif /* (USE_HAL_UART_REGISTER_CALLBACKS) */ } huart->gState = HAL_UART_STATE_BUSY; /* Disable the peripheral */ __HAL_UART_DISABLE(huart); /* Set the UART Communication parameters */ UART_SetConfig(huart); /* In asynchronous mode, the following bits must be kept cleared: - LINEN and CLKEN bits in the USART_CR2 register, - SCEN, HDSEL and IREN bits in the USART_CR3 register.*/ CLEAR_BIT(huart->Instance->CR2, (USART_CR2_LINEN | USART_CR2_CLKEN)); CLEAR_BIT(huart->Instance->CR3, (USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN)); /* Enable the peripheral */ __HAL_UART_ENABLE(huart); /* Initialize the UART state */ huart->ErrorCode = HAL_UART_ERROR_NONE; huart->gState = HAL_UART_STATE_READY; huart->RxState = HAL_UART_STATE_READY; return HAL_OK; }

这是HAL库中初始化UART外设的函数。它会首先检查传入的参数是否合法，然后根据传入的参数设置UART通信参数，最后使能UART外设并将状态设置为READY。在这个函数中还会调用HAL_UART_MspInit()或者用户自定义的MspInitCallback()函数来初始化外设的引脚和时钟等低级硬件。

这个函数怎么使用HAL_StatusTypeDef HAL_UART_Init(UART_HandleTypeDef *huart) { /* Check the UART handle allocation */ if (huart == NULL) { return HAL_ERROR; } /* Check the parameters */ if (huart->Init.HwFlowCtl != UART_HWCONTROL_NONE) { /* The hardware flow control is available only for USART1, USART2, USART3 and USART6. Except for STM32F446xx devices, that is available for USART1, USART2, USART3, USART6, UART4 and UART5. */ assert_param(IS_UART_HWFLOW_INSTANCE(huart->Instance)); assert_param(IS_UART_HARDWARE_FLOW_CONTROL(huart->Init.HwFlowCtl)); } else { assert_param(IS_UART_INSTANCE(huart->Instance)); } assert_param(IS_UART_WORD_LENGTH(huart->Init.WordLength)); assert_param(IS_UART_OVERSAMPLING(huart->Init.OverSampling)); if (huart->gState == HAL_UART_STATE_RESET) { /* Allocate lock resource and initialize it */ huart->Lock = HAL_UNLOCKED; #if (USE_HAL_UART_REGISTER_CALLBACKS == 1) UART_InitCallbacksToDefault(huart); if (huart->MspInitCallback == NULL) { huart->MspInitCallback = HAL_UART_MspInit; } /* Init the low level hardware */ huart->MspInitCallback(huart); #else /* Init the low level hardware : GPIO, CLOCK */ HAL_UART_MspInit(huart); #endif /* (USE_HAL_UART_REGISTER_CALLBACKS) */ } huart->gState = HAL_UART_STATE_BUSY; /* Disable the peripheral */ __HAL_UART_DISABLE(huart); /* Set the UART Communication parameters */ UART_SetConfig(huart); /* In asynchronous mode, the following bits must be kept cleared: - LINEN and CLKEN bits in the USART_CR2 register, - SCEN, HDSEL and IREN bits in the USART_CR3 register.*/ CLEAR_BIT(huart->Instance->CR2, (USART_CR2_LINEN | USART_CR2_CLKEN)); CLEAR_BIT(huart->Instance->CR3, (USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN)); /* Enable the peripheral */ __HAL_UART_ENABLE(huart); /* Initialize the UART state */ huart->ErrorCode = HAL_UART_ERROR_NONE; huart->gState = HAL_UART_STATE_READY; huart->RxState = HAL_UART_STATE_READY; return HAL_OK; }

这个函数是HAL库（STM32的驱动库）中的UART初始化函数，用于初始化指定的UART外设。它的参数是一个UART_HandleTypeDef类型的指针，其中包含了UART的初始化参数和外设的实例。函数执行过程中会进行一系列的参数检查，包括检查参数是否为空、硬件流控制是否可用、数据位长度是否合法等等。如果UART的gState状态为HAL_UART_STATE_RESET，那么它会先初始化底层硬件资源（包括GPIO和时钟），否则会直接进行配置和使能。最后，函数会将UART的状态设置为HAL_UART_STATE_READY，表示初始化完成。