stm32f103c8t6驱动bmp280

基于STM32F103C8T6驱动BMP280可以使用硬件SPI或者软件I2C进行通信。下面是两种方法的介绍：

1. 使用硬件SPI驱动BMP280：

#include "stm32f10x.h"
#include "spi.h"
#include "bmp280.h"

#define BMP280_CS_PIN GPIO_Pin_4
#define BMP280_CS_PORT GPIOA

void BMP280_SPI_Init(void)
{
    // 初始化SPI接口
    SPI_InitTypeDef SPI_InitStruct;
    SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
    SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStruct.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStruct);
    SPI_Cmd(SPI1, ENABLE);

    // 初始化CS引脚
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.GPIO_Pin = BMP280_CS_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(BMP280_CS_PORT, &GPIO_InitStruct);
}

void BMP280_SPI_CS(uint8_t state)
{
    if (state == 0)
    {
        GPIO_ResetBits(BMP280_CS_PORT, BMP280_CS_PIN);
    }
    else
    {
        GPIO_SetBits(BMP280_CS_PORT, BMP280_CS_PIN);
    }
}

void BMP280_SPI_Transfer(uint8_t *txData, uint8_t *rxData, uint16_t size)
{
    while (size--)
    {
        SPI_I2S_SendData(SPI1, *txData++);
        while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
            ;
        *rxData++ = SPI_I2S_ReceiveData(SPI1);
    }
}

void BMP280_Delay(uint32_t ms)
{
    // 延时函数，根据实际情况实现
    // 例如使用SysTick定时器
    uint32_t start = SysTick->VAL;
    uint32_t end = start - ms * (SystemCoreClock / 1000);
    if (end > start)
    {
        while (SysTick->VAL > end)
            ;
    }
    else
    {
        while (SysTick->VAL > end && SysTick->VAL < start)
            ;
    }
}

int main(void)
{
    // 初始化SPI和CS引脚
    BMP280_SPI_Init();
    BMP280_SPI_CS(1);

    // 初始化BMP280
    bmp280_init(BMP280_SPI_Transfer, BMP280_SPI_CS, BMP280_Delay);

    // 获取气压值和温度值
    int32_t pressure;
    int32_t temperature;
    bmp280_get_pressure_temperature(&pressure, &temperature);

    // 打印结果
    printf("Pressure: %ld Pa\n", pressure);
    printf("Temperature: %ld °C\n", temperature);

    while (1)
    {
    }
}

2. 使用软件I2C驱动BMP280：

#include "stm32f10x.h"
#include "i2c.h"
#include "bmp280.h"

#define BMP280_I2C_ADDR 0x76

void BMP280_I2C_Init(void)
{
    // 初始化I2C接口
    I2C_InitTypeDef I2C_InitStruct;
    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_InitStruct.I2C_ClockSpeed = 100000;
    I2C_Init(I2C1, &I2C_InitStruct);
    I2C_Cmd(I2C1, ENABLE);
}

void BMP280_I2C_Write(uint8_t regAddr, uint8_t *data, uint16_t size)
{
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, BMP280_I2C_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
        ;

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

    while (size--)
    {
        I2C_SendData(I2C1, *data++);
        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
            ;
    }

    I2C_GenerateSTOP(I2C1, ENABLE);
}

void BMP280_I2C_Read(uint8_t regAddr, uint8_t *data, uint16_t size)
{
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, BMP280_I2C_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
        ;

    I2C_SendData(I2C1, regAddr);
    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, BMP280_I2C_ADDR, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
        ;

    while (size--)
    {
        if (size == 0)
        {
            I2C_AcknowledgeConfig(I2C1, DISABLE);
            I2C_GenerateSTOP(I2C1, ENABLE);
        }

        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
            ;
        *data++ = I2C_ReceiveData(I2C1);
    }

    I2C_AcknowledgeConfig(I2C1, ENABLE);
}

void BMP280_Delay(uint32_t ms)
{
    // 延时函数，根据实际情况实现
    // 例如使用SysTick定时器
    uint32_t start = SysTick->VAL;
    uint32_t end = start - ms * (SystemCoreClock / 1000);
    if (end > start)
    {
        while (SysTick->VAL > end)
            ;
    }
    else
    {
        while (SysTick->VAL > end && SysTick->VAL < start)
            ;
    }
}

int main(void)
{
    // 初始化I2C接口
    BMP280_I2C_Init();

    // 初始化BMP280
    bmp280_init(BMP280_I2C_Write, BMP280_I2C_Read, BMP280_Delay);

    // 获取气压值和温度值
    int32_t pressure;
    int32_t temperature;
    bmp280_get_pressure_temperature(&pressure, &temperature);

    // 打印结果
    printf("Pressure: %ld Pa\n", pressure);
    printf("Temperature: %ld °C\n", temperature);

    while (1)
    {
    }
}