实时任务调度与通信协议在嵌入式开发中的应用

#include <stdio.h>
#include "FreeRTOS.h"
#include "task.h"

void highPriorityTask(void *pvParameters) {
    while (1) {
        // 高优先级任务的代码逻辑
    }
}

void lowPriorityTask(void *pvParameters) {
    while (1) {
        // 低优先级任务的代码逻辑
    }
}

int main() {
    xTaskCreate(highPriorityTask, "HighTask", configMINIMAL_STACK_SIZE, NULL, 2, NULL);
    xTaskCreate(lowPriorityTask, "LowTask", configMINIMAL_STACK_SIZE, NULL, 1, NULL);
    vTaskStartScheduler();
    return 0;
}

#include <stdio.h>
#include "FreeRTOS.h"
#include "task.h"

void task1(void *pvParameters) {
    while (1) {
        // 任务1的代码逻辑
    }
}

void task2(void *pvParameters) {
    while (1) {
        // 任务2的代码逻辑
    }
}

int main() {
    xTaskCreate(task1, "Task1", configMINIMAL_STACK_SIZE, NULL, 1, NULL);
    xTaskCreate(task2, "Task2", configMINIMAL_STACK_SIZE, NULL, 1, NULL);
    vTaskStartScheduler();
    return 0;
}

#include <stdio.h>
#include <stdint.h>
#include "stm32f4xx.h"  // 假设使用STM32F4系列微控制器
#include "stm32f4xx_i2c.h"

#define I2C_SCL_PIN GPIO_Pin_6
#define I2C_SDA_PIN GPIO_Pin_7

void I2C_Init() {
    I2C_InitTypeDef I2C_InitStruct;
    GPIO_InitTypeDef GPIO_InitStruct;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    GPIO_InitStruct.GPIO_Pin = I2C_SCL_PIN | I2C_SDA_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1); // SCL引脚
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1); // SDA引脚

    I2C_InitStruct.I2C_ClockSpeed = 100000;  // 100 kHz
    I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStruct.I2C_OwnAddress1 = 0x00;
    I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_Init(I2C1, &I2C_InitStruct);

    I2C_Cmd(I2C1, ENABLE);
}

uint8_t I2C_ReadTemperature(uint8_t deviceAddress, uint8_t regAddress) {
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); // 等待总线空闲

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, regAddress);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    uint8_t data = I2C_ReceiveData(I2C1);

    I2C_GenerateSTOP(I2C1, ENABLE);

    return data;
}

int main() {
    I2C_Init();
    
    uint8_t temperature = I2C_ReadTemperature(0x48, 0x00); // 从设备地址0x48读取寄存器0x00的温度数据
    printf("Temperature: %d°C\n", temperature);

    while (1) {
        // 主循环
    }
}