huart->RxState = HAL_UART_STATE_READY;
时间: 2024-05-27 18:11:04 浏览: 19
This line of code sets the RxState of the UART (Universal Asynchronous Receiver/Transmitter) to the READY state, indicating that the UART is ready to receive data. The HAL (Hardware Abstraction Layer) is a layer of software that abstracts the hardware details of the microcontroller, allowing higher-level software to be written in a more portable and easier-to-understand way. This line is likely part of the initialization code for the UART, which sets up the necessary hardware and software structures to enable the UART to function properly.
相关问题
怎么使用这个函数初始化串口3HAL_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; }
这个函数是用来初始化UART串口的,具体的使用方法如下:
1. 首先需要定义一个`UART_HandleTypeDef`类型的结构体变量`huart`,并对其中的各个成员变量进行配置,例如:
```
UART_HandleTypeDef huart;
huart.Instance = USART3;
huart.Init.BaudRate = 115200;
huart.Init.WordLength = UART_WORDLENGTH_8B;
huart.Init.StopBits = UART_STOPBITS_1;
huart.Init.Parity = UART_PARITY_NONE;
huart.Init.Mode = UART_MODE_TX_RX;
huart.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart.Init.OverSampling = UART_OVERSAMPLING_16;
```
2. 调用`HAL_UART_Init()`函数进行初始化,将上述结构体变量传入该函数即可。
```
HAL_StatusTypeDef result = HAL_UART_Init(&huart);
if (result != HAL_OK) {
// 初始化失败,进行错误处理
} else {
// 初始化成功,进行后续操作
}
```
在该函数内部,会先进行一些参数检查,然后根据参数配置寄存器,最终完成UART串口的初始化。
if (huart->gState == HAL_UART_STATE_READY),return HAL_BUSY;怎么解决
要解决这个问题,你可以使用一个循环来等待 `HAL_UART_STATE_READY` 状态。在循环中,检查 `huart->gState` 的值,直到它变为 `HAL_UART_STATE_READY`。一旦达到这个状态,你可以返回 `HAL_BUSY`。以下是一个示例代码:
```c
while (huart->gState != HAL_UART_STATE_READY) {
// 等待直到状态变为 HAL_UART_STATE_READY
}
return HAL_BUSY;
```
这段代码会一直循环检查状态,直到状态变为 `HAL_UART_STATE_READY`。一旦达到这个状态,就会跳出循环并返回 `HAL_BUSY`。这样可以确保在状态变为 `HAL_UART_STATE_READY` 之前不会继续执行后面的代码。
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