基于STM32F10X的BMP280完整程序示例，采用IIC通信方式，可以实现温度、气压和高度的测试。
硬件连接
| BMP280 Pin | STM32 Pin |
|---|---|
| SDA | PB7 |
| SCL | PB6 |
| VCC | 3.3V |
| GND | GND |
软件部分
1. 初始化I2C GPIO引脚
void MX_GPIO_Init(void) {
__HAL_RCC_GPIOB_CLK_ENABLE(); // 启用 GPIOB 时钟
GPIO_InitTypeDef GPIO_InitStruct = {
0};
// 配置 SCL (PB6)
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; // 复用开漏模式
GPIO_InitStruct.Pull = GPIO_PULLUP; // 上拉电阻
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1; // 设置为 I2C1 复用功能
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
// 配置 SDA (PB7)
GPIO_InitStruct.Pin = GPIO_PIN_7;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
2. BMP280驱动代码
bmp280.h
#ifndef __BMP280_H
#define __BMP280_H
#include "stm32f10x.h"
#include "sys.h"
#include "stdbool.h"
#define SCL_GPIO_PORT GPIOB /* GPIO端口 */
#define SCL_GPIO_CLK RCC_APB2Periph_GPIOB /* GPIO端口时钟 */
#define SCL_GPIO_PIN GPIO_Pin_6 /* 连接到SCL时钟线的GPIO */
#define SDA_GPIO_PORT GPIOB /* GPIO端口 */
#define SDA_GPIO_CLK RCC_APB2Periph_GPIOB /* GPIO端口时钟 */
#define SDA_GPIO_PIN GPIO_Pin_7 /* 连接到SDA数据线的GPIO */
//IO操作函数
#define IIC_SCL PBout(6) //SCL
#define IIC_SDA PBout(7) //SDA
#define READ_SDA PBin(7) //输入SDA
// BME280的I2C地址，通常为0xEC
#define BME280_ADDRESS 0XEC
#define BME280_ADDR (0x76)
#define BME280_DEFAULT_CHIP_ID (0x60)
#define BME280_CHIP_ID (0xD0) /* Chip ID Register */
#define BME280_RST_REG (0xE0) /* Softreset Register */
#define BME280_CTRL_HUM (0xF2) /* Ctrl Humidity Register */
#define BME280_STAT_REG (0xF3) /* Status Register */
#define BME280_CTRL_MEAS_REG (0xF4) /* Ctrl Measure Register */
#define BME280_CONFIG_REG (0xF5) /* Configuration Register */
#define BME280_PRESSURE_MSB_REG (0xF7) /* Pressure MSB Register */
#define BME280_PRESSURE_LSB_REG (0xF8) /* Pressure LSB Register */
#define BME280_PRESSURE_XLSB_REG (0xF9) /* Pressure XLSB Register */
#define BME280_TEMPERATURE_MSB_REG (0xFA) /* Temperature MSB Reg */
#define BME280_TEMPERATURE_LSB_REG (0xFB) /* Temperature MSB Reg */
#define BME280_TEMPERATURE_XLSB_REG (0xFC) /* Temperature XLSB Reg */
#define BME280_HUMIDITY_MSB_REG (0xFD) /* Humidity MSB Reg */
#define BME280_HUMIDITY_LSB_REG (0xFE) /* Humidity LSB Reg */
#define BME280_SLEEP_MODE (0x00)
#define BME280_FORCED_MODE (0x01)
#define BME280_NORMAL_MODE (0x03)
#define BME280_TEMPERATURE_CALIB_DIG_T1_LSB_REG (0x88)
#define BME280_PRESSURE_TEMPERATURE_CALIB_DATA_LENGTH (32)
#define BME280_DATA_FRAME_SIZE (8)
#define BME280_OVERSAMP_SKIPPED (0x00)
#define BME280_OVERSAMP_1X (0x01)
#define BME280_OVERSAMP_2X (0x02)
#define BME280_OVERSAMP_4X (0x03)
#define BME280_OVERSAMP_8X (0x04)
#define BME280_OVERSAMP_16X (0x05)
#define CONST_PF 0.1902630958 //(1/5.25588f) Pressure factor
#define FIX_TEMP 25 // Fixed Temperature. ASL is a function of pressure and temperature, but as the temperature changes so much (blow a little towards the flie and watch it drop 5 degrees) it corrupts the ASL estimates.
typedef struct
{
u16 dig_T1; /* calibration T1 data */
s16 dig_T2; /* calibration T2 data */
s16 dig_T3; /* calibration T3 data */
u16 dig_P1; /* calibration P1 data */
s16 dig_P2; /* calibration P2 data */
s16 dig_P3; /* calibration P3 data */
s16 dig_P4; /* calibration P4 data */
s16 dig_P5; /* calibration P5 data */
s16 dig_P6; /* calibration P6 data */
s16 dig_P7; /* calibration P7 data */
s16 dig_P8; /* calibration P8 data */
s16 dig_P9; /* calibration P9 data */
u8 dig_H1; /* calibration H1 data */
s16 dig_H2; /* calibration H2 data */
u8 dig_H3; /* calibration H3 data */
s16 dig_H4; /* calibration H4 data */
s16 dig_H5; /* calibration H5 data */
u8 dig_H6; /* calibration H6 data */
s32 t_fine; /* calibration t_fine data */
} bme280Calib;
// BMP280
void bme280Init(void);
void bme280GetData(float* pressure,float* temperature,float* asl);
//IIC所有操作函数
void IIC_Init(void); //初始化IIC的IO口
void IIC_Start(void); //发送IIC开始信号
void IIC_Stop(void); //发送IIC停止信号
void IIC_Send_Byte(u8 txd); //IIC发送一个字节
u8 IIC_Read_Byte(unsigned char ack); //IIC读取一个字节
u8 IIC_Wait_Ack(void); //IIC等待ACK信号
void IIC_Ack(void); //IIC发送ACK信号
void IIC_NAck(void); //IIC不发送ACK信号
void IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data);
u8 IIC_Read_One_Byte(u8 daddr,u8 addr);
u8 iicDevReadByte(u8 devaddr,u8 addr); /*读一字节*/
void iicDevWriteByte(u8 devaddr,u8 addr,u8 data); /*写一字节*/
void iicDevRead(u8 devaddr,u8 addr,u8 len,u8 *rbuf); /*连续读取多个字节*/
void iicDevWrite(u8 devaddr,u8 addr,u8 len,u8 *wbuf); /*连续写入多个字节*/
void iicDevReadCal(u8 devaddr,u8 addr,u8 len,bme280Calib *bme280Ctype);
void iicDevReadCal1(u8 devaddr,u8 addr,u8 len,u8 *rbuf);
#endif // __BMP280_H
3. 主程序main.c
#include "stm32f10x.h"
#include "delay.h"
#include "led.h"
#include "key.h"
#include "usart.h"
#include "bmp280.h"
int main(void)
{
float bmp280_temp;
float bmp280_press;
float bmp280_humi;
float high;
delay_init();
NVIC_PriorityGroupConfig(NVIC
