探索STM32G431：高性能与代码实践

#include "main.h"

#include "stm32g4xx_hal.h"



UART_HandleTypeDef huart2;

TIM_HandleTypeDef htim3;



void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_USART2_UART_Init(void);

static void MX_TIM3_Init(void);



int main(void)

{

    HAL_Init();

    SystemClock_Config();

    MX_GPIO_Init();

    MX_USART2_UART_Init();

    MX_TIM3_Init();



    // 启动PWM

    HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);



    char msg[] = "Hello, STM32G431!\r\n";



    while (1)

    {

        // 通过 UART 发送信息

        HAL_UART_Transmit(&huart2, (uint8_t*)msg, sizeof(msg) - 1, HAL_MAX_DELAY);

        HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0); // 切换 LED 状态

        HAL_Delay(500); // 延迟 500ms

    }

}



void SystemClock_Config(void)

{

    // 配置时钟为 170MHz

    RCC_OscInitTypeDef RCC_OscInitStruct = {0};

    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};



    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;

    RCC_OscInitStruct.HSIState = RCC_HSI_ON;

    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;

    RCC_OscInitStruct.PLL.PLLM = 2;

    RCC_OscInitStruct.PLL.PLLN = 85;

    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;

    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;

    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;

    HAL_RCC_OscConfig(&RCC_OscInitStruct);



    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK

                                | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;

    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;

    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;

    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);

}



static void MX_GPIO_Init(void)

{

    // 初始化 GPIO，用于 LED 输出

    __HAL_RCC_GPIOB_CLK_ENABLE();

    GPIO_InitTypeDef GPIO_InitStruct = {0};



    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(GPIOB, &GPIO_InitStruct);

}



static void MX_USART2_UART_Init(void)

{

    // 配置 UART2

    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;

    HAL_UART_Init(&huart2);

}



static void MX_TIM3_Init(void)

{

    // 配置定时器 TIM3，用于 PWM 输出

    __HAL_RCC_TIM3_CLK_ENABLE();

    TIM_OC_InitTypeDef sConfigOC = {0};



    htim3.Instance = TIM3;

    htim3.Init.Prescaler = 84 - 1;

    htim3.Init.CounterMode = TIM_COUNTERMODE_UP;

    htim3.Init.Period = 1000 - 1;

    htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

    HAL_TIM_PWM_Init(&htim3);



    sConfigOC.OCMode = TIM_OCMODE_PWM1;

    sConfigOC.Pulse = 500; // 占空比50%

    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

    HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);

}