Configure pins as * Analog * Input * Output * EVENT_OUT * EXTI */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; /* GPIO Ports Clock Enable */ //__HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); //__HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(LEDR_OUT_PD3_GPIO_Port, LEDR_OUT_PD3_Pin, GPIO_PIN_SET); /*Configure GPIO pin Output Level */ //HAL_GPIO_WritePin(GPIOB, RS485_RE_OUT_PB8_Pin|RS485_SE_OUT_PB9_Pin, GPIO_PIN_RESET); /*Configure GPIO pin : LEDR_OUT_PD3_Pin */ GPIO_InitStruct.Pin = LEDR_OUT_PD3_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; HAL_GPIO_Init(LEDR_OUT_PD3_GPIO_Port, &GPIO_InitStruct); /*Configure GPIO pins : RS485_RE_OUT_PB8_Pin RS485_SE_OUT_PB9_Pin */ GPIO_InitStruct.Pin = RS485_RE_OUT_PB8_Pin|RS485_SE_OUT_PB9_Pin; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); } /* USER CODE BEGIN 4 */ /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @param file: The file name as string. * @param line: The line in file as a number. * @retval None */ void _Error_Handler(char *file, int line) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ while(1) { } /* USER CODE END Error_Handler_Debug */

这是用于初始化GPIO引脚的函数。在该函数中，首先使能了GPIOC、GPIOD和GPIOB端口的时钟。然后，配置了LEDR_OUT_PD3_Pin引脚为输出模式，初始电平为高电平。接着，配置了RS485_RE_OUT_PB8_Pin和RS485_SE_OUT_PB9_Pin引脚为输出模式，初始电平为高电平。最后，定义了一个错误处理函数_Error_Handler，当发生错误时会进入该函数进行处理。

需要注意的是，该函数中有一段注释掉的代码，可能是之前的配置代码被注释掉了。

相关问题

stm32f103zet6GPIO

### STM32F103ZET6 GPIO Configuration and Usage Examples

For configuring the General-Purpose Input/Output (GPIO) pins on an STM32F103ZET6 microcontroller, several steps must be followed to ensure proper initialization and operation of these pins. The process can be efficiently managed using tools like ST's CubeMX software or directly through code when working within environments such as PlatformIO integrated with VSCode.

#### Initialization Using HAL Library Functions
The Hardware Abstraction Layer (HAL) library simplifies peripheral control by providing ready-to-use functions that abstract hardware-specific details away from developers. For initializing a GPIO pin:

// Define the GPIO structure parameters.
GPIO_InitTypeDef GPIO_InitStruct = {0};

// Enable clock for the specific GPIO port being used.
__HAL_RCC_GPIOA_CLK_ENABLE();

// Configure PA0 as output push-pull mode at low speed.
GPIO_InitStruct.Pin = GPIO_PIN_0;
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);

This example sets up Port A Pin 0 (`PA0`) as an output in push-pull configuration without pull-up/pull-down resistors enabled[^1].

#### Reading and Writing Digital Signals
Once configured, reading input values or writing outputs becomes straightforward via provided API calls:

To set `PA0` high:

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);

To read the state of another pin, say `PB1`, after setting it as input:

uint8_t value = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1);
if(value != GPIO_PIN_RESET){
    // PB1 is HIGH
}
else{
    // PB1 is LOW
}

These operations allow direct manipulation of digital signals connected to the specified I/O lines while adhering closely to best practices outlined in development guidelines related to this device family.

#### Interrupt Handling Example
Interrupts provide efficient ways to respond asynchronously to changes occurring externally relative to program flow. Setting up interrupts involves configuring EXTI lines associated with particular ports and enabling corresponding NVIC channels:

// Assuming PC13 has been previously initialized as input.
EXTI_HandleTypeDef hexti;

hexti.Instance = EXTI13; 
hexti.Init.Trigger = EXTI_TRIGGER_RISING_FALLING;
hexti.Init.LineCmd = ENABLE;

if(HAL_EXTI_Init(&hexti)!= HAL_OK){
    Error_Handler();
}

NVIC_SetPriority(EXTI15_10_IRQn, 0);  
NVIC_EnableIRQ(EXTI15_10_IRQn);

void EXTI15_10_IRQHandler(void){
    HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_13);
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){
    if(GPIO_Pin == GPIO_PIN_13){
        // Handle interrupt event here...
    }
}

In summary, configuring and utilizing GPIO functionalities on STM32 devices requires careful setup but offers powerful capabilities once implemented correctly according to established procedures found in official documentation and community resources.

Connect EXTI3 Line to PC3 pin

To connect EXTI3 line to PC3 pin, you need to configure the GPIO pins of the microcontroller. Here are the steps to do it:

1. Enable the GPIOC clock.

2. Configure PC3 as an input pin.

3. Configure EXTI3 to use PC3 as the interrupt source.

4. Enable the EXTI3 interrupt.

Here is some sample code to do it:

// Enable GPIOC clock
RCC->AHBENR |= RCC_AHBENR_GPIOCEN;

// Configure PC3 as input pin
GPIOC->MODER &= ~(GPIO_MODER_MODER3);

// Configure EXTI3 to use PC3 as interrupt source
SYSCFG->EXTICR[0] &= ~(SYSCFG_EXTICR1_EXTI3);
SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI3_PC;

// Enable EXTI3 interrupt
EXTI->IMR |= EXTI_IMR_IM3;

After this code is executed, the EXTI3 line will be connected to the PC3 pin and the interrupt will be enabled. When the input on PC3 changes, the microcontroller will generate an interrupt on EXTI3.