环境
1、keilMDK 5.38
2、STM32CUBEMX
初始配置
默认即可。
程序
1、头文件
#ifndef __BMP_180_H
#define __BMP_180_H#include "main.h"typedef struct
{float fTemp; /*温度，摄氏度*/float fPressure; /*压力，pa*/float fAltitude; /*高度，米*/
}BMP180Data_T;extern BMP180Data_T g_tBMP180;void BMP180_Init(void);void BMP180_StartTempSample(void); /*开始温度采集*/
void BMP180_GetTemp(BMP180Data_T *tpBMP180); /*最少等待4.5ms，才能获取温度*/void BMP180_StartPressureSample(void);
void BMP180_GetPressureAltitude(BMP180Data_T *tpBMP180);
#endif2、C文件
#include "bmp180.h"
#include "i2c.h"
#include "math.h"#define BMP180_COM_PORT hi2c1 /*通讯端口*/#define BMP180_ADDR 0xEE /*定义器件在IIC总线中的从地址*/
#define BMP180_CALIB_REG 0xAA /*校准寄存器开始地址*/
#define BMP180_MADDR_W 0xF4 /*写入地址*/
#define BMP180_MADDR_R 0xF6 /*读取地址*/#define SEA_PRESSURE 101325.0f /*海平面气压，pa*/BMP180Data_T g_tBMP180;uint16_t BMP180_CMD_WD = 0X2E; /*温度控制寄存器，设置后，读取温度需要延迟4.5ms*///uint16_t BMP180_CMD_QY = 0x34; //气压，需要延迟4.5ms
//uint16_t BMP180_CMD_QY = 0x74; //气压，需要延迟7.5ms
//uint16_t BMP180_CMD_QY = 0xB4; //气压，需要延迟13.5ms
uint16_t BMP180_CMD_QY = 0xF4; /*气压控制寄存器值，设置后，读取气压需要延迟25.5ms*/
int osrs;//定义BMP初始化变量
typedef struct {int16_t AC1;int16_t AC2;int16_t AC3;uint16_t AC4;uint16_t AC5;uint16_t AC6;int16_t B1;int16_t B2;int16_t MB;int16_t MC;int16_t MD;int32_t B5;
} BMP180_Calibration_TypeDef;
BMP180_Calibration_TypeDef BMP180_Calibration;/** I2C气压读取 **/
//初始化所有默认值
void BMP180_Init()
{uint8_t buffer[22];if(BMP180_CMD_QY == 0x34){osrs = 0;}else if(BMP180_CMD_QY == 0x74){osrs = 1;}else if(BMP180_CMD_QY == 0xb4){osrs = 2;}else if(BMP180_CMD_QY == 0xF4){osrs = 3;} HAL_I2C_Mem_Read(&BMP180_COM_PORT, BMP180_ADDR, BMP180_CALIB_REG, I2C_MEMADD_SIZE_8BIT, (uint8_t *)buffer, 22, 3000);BMP180_Calibration.AC1 = (buffer[0] << 8) | buffer[1];BMP180_Calibration.AC2 = (buffer[2] << 8) | buffer[3];BMP180_Calibration.AC3 = (buffer[4] << 8) | buffer[5];BMP180_Calibration.AC4 = (buffer[6] << 8) | buffer[7];BMP180_Calibration.AC5 = (buffer[8] << 8) | buffer[9];BMP180_Calibration.AC6 = (buffer[10] << 8) | buffer[11];BMP180_Calibration.B1 = (buffer[12] << 8) | buffer[13];BMP180_Calibration.B2 = (buffer[14] << 8) | buffer[15];BMP180_Calibration.MB = (buffer[16] << 8) | buffer[17];BMP180_Calibration.MC = (buffer[18] << 8) | buffer[19];BMP180_Calibration.MD = (buffer[20] << 8) | buffer[21];
}
//温度计算
int16_t BMP180_Calc_WD(uint16_t UT)
{BMP180_Calibration.B5 = (((int32_t)UT - (int32_t)BMP180_Calibration.AC6) * (int32_t)BMP180_Calibration.AC5) >> 15;BMP180_Calibration.B5 += ((int32_t)BMP180_Calibration.MC << 11) / (BMP180_Calibration.B5 + BMP180_Calibration.MD);return (BMP180_Calibration.B5 + 8) >> 4;
}
//气压计算
int32_t BMP180_Calc_QY(uint32_t UP, uint8_t oss)
{int32_t B3,B6,X3,p;uint32_t B4,B7;B6 = BMP180_Calibration.B5 - 4000;X3 = ((BMP180_Calibration.B2 * ((B6 * B6) >> 12)) >> 11) + ((BMP180_Calibration.AC2 * B6) >> 11);B3 = (((((int32_t)BMP180_Calibration.AC1) * 4 + X3) << oss) + 2) >> 2;X3 = (((BMP180_Calibration.AC3 * B6) >> 13) + ((BMP180_Calibration.B1 * ((B6 * B6) >> 12)) >> 16) + 2) >> 2;B4 = (BMP180_Calibration.AC4 * (uint32_t)(X3 + 32768)) >> 15;B7 = ((uint32_t)UP - B3) * (50000 >> oss);if (B7 < 0x80000000) p = (B7 << 1) / B4; else p = (B7 / B4) << 1;p = p + (((((p >> 8) * (p >> 8) * 3038) >> 16) + ((-7357 * p) >> 16) + 3791) >> 4);return p;
}
//海拔计算
float BMP180_Calc_HB(int32_t Pa)
{
// return 44330 * (1 - pow( Pa/ SEA_PRESSURE, 1.0f / 5.255f));return 44330 * (1 - pow( Pa/ SEA_PRESSURE, 0.190295F));
}/*
****************************************************************************************
* 说明：开始温度采集
* 输入：无
* 输出：无
****************************************************************************************
*/
void BMP180_StartTempSample(void)
{HAL_I2C_Mem_Write(&BMP180_COM_PORT, BMP180_ADDR, BMP180_MADDR_W, I2C_MEMADD_SIZE_8BIT, (uint8_t *)&BMP180_CMD_WD, 1, 100);
}/*
****************************************************************************************
* 说明：获取温度
* 输入：无
* 输出：浮点温度值，摄氏度，
****************************************************************************************
*/
void BMP180_GetTemp(BMP180Data_T *tpBMP180)
{uint8_t ucTemp[2];uint16_t usTemp;float fTemp;HAL_I2C_Mem_Read(&BMP180_COM_PORT, BMP180_ADDR, BMP180_MADDR_R, I2C_MEMADD_SIZE_8BIT, ucTemp, 2, 100);usTemp = (ucTemp[0]<<8) | ucTemp[1];fTemp = BMP180_Calc_WD(usTemp) / 10.0f;tpBMP180->fTemp = fTemp;
}/*
****************************************************************************************
* 说明：开始压力采集
* 输入：无
* 输出：无
****************************************************************************************
*/
void BMP180_StartPressureSample(void)
{HAL_I2C_Mem_Write(&BMP180_COM_PORT, BMP180_ADDR, BMP180_MADDR_W, I2C_MEMADD_SIZE_8BIT, (uint8_t *)&BMP180_CMD_QY, 1, 100);
}/*
****************************************************************************************
* 说明：获取压力和高度
* 输入：无
* 输出：浮点压力数据，高度数据
****************************************************************************************
*/
void BMP180_GetPressureAltitude(BMP180Data_T *tpBMP180)
{uint8_t ucTemp[3];uint32_t ulPressure;int32_t lPressure;HAL_I2C_Mem_Read(&BMP180_COM_PORT, BMP180_ADDR, BMP180_MADDR_R, I2C_MEMADD_SIZE_8BIT, ucTemp, 3, 1000);//做气压运算ulPressure = ((ucTemp[0] << 16) + (ucTemp[1] <<8) + ucTemp[2]) >> (8 - osrs);lPressure = BMP180_Calc_QY(ulPressure,osrs); //气压值tpBMP180->fPressure = (float)lPressure;//计算海拔tpBMP180->fAltitude = BMP180_Calc_HB(lPressure);
}使用
包含头文件后，先初始化BMP180
注意
1、温度的转换-读取时间是4.5ms间隔，压力的转换-读取时间，根据配置的不一样，延时时间不一样。
2、读取压力的时候，有些文章里面用的是“|”运算，结果不对，应该是“+”运算。
错误代码：
((uint32_t)REG_Data[0] << 16 | (uint32_t)REG_Data[1] <<8 | (uint32_t)REG_Data[2]) >> (8 - OSS);
正确运算：
结果
