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STM32实现气压传感器测量（BMP180）_bmp180气压传感器

作者：我家自动化 | 2024-05-02 13:29:56

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bmp180气压传感器

目录

0.接线设计

1.功能描述

2.四种方式实现大气压采集

3.模块选择

4.编程环境

5.模块主要参数

6.代码实现

        1）标准库模拟IIC实现气压值采集

         2）标准库硬件IIC实现气压值采集

         3）HAL库模拟IIC实现气压值采集

        4）HAL库硬件IIC实现气压值采集

0.接线设计

硬件接口：IIC_SCL -- PB6
                  IIC_SDA -- PB7

串口使用串口1：PA9和PA10

1.功能描述

        通过STM32实现BMP180大气压传感器模块数据采集，并将采集的数据在串口显示。

        本传感器支持IIC通信，实物图如下：

         网上建议在SCL和SDA引脚上，上拉两个4.7K电阻，保证通信稳定，但我实现没有增加这两个电阻，通信正常，可能也有不稳定情况，大家自行判断。我没有上拉电阻，信息采集正常。

2.四种方式实现大气压采集

        1）标准库模拟IIC实现气压值采集；

        2）标准库硬件IIC实现气压值采集；

        3）HAL库模拟IIC实现气压值采集；

        4）HAL库硬件IIC实现气压值采集。

3.模块选择

        ·STM32F103C8T6（其它型号也是一样）

        ·BMP180气压传感器模块

        ·USB-TTL串口调试助手

4.编程环境

        STM32CubeMX（工程可视化配置环境IDE，HAL库使用）

        keil5（编程环境）

5.模块主要参数

        BMP180有一个产品文档，大家可以参考文档实现程序。

         测量流程图。

        温度和大气压测量：

        海拔测量：

6.代码实现

        1）标准库模拟IIC实现气压值采集

  1. //********************************************************************
  2. u16 bmp180ReadTemp(void)
  3. {
  4. 	int cnt = 0;
  5. 	IIC_Start();                  //起始信号
  6. 	IIC_Send_Byte(BMP180_SlaveAddress);   //发送设备地址+写信号   BMP180_SlaveAddress  0xee	气压传感器器件地址
  7. 	cnt = 0;
  8. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  9. 	{
  10. 		cnt++;
  11. 		delay_ms(1);
  12. 		if(cnt>=100)return 1;
  13. 	} 
  14. 	IIC_Send_Byte(0xF4);	          // write register address
  15. 	cnt = 0;
  16. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  17. 	{
  18. 		cnt++;
  19. 		delay_ms(1);
  20. 		if(cnt>=100)return 1;
  21. 	} 
  22. 	IIC_Send_Byte(0x2E);       	// write register data for temp
  23. 	cnt = 0;
  24. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  25. 	{
  26. 		cnt++;
  27. 		delay_ms(1);
  28. 		if(cnt>=100)return 1;
  29. 	} 
  30. 	IIC_Stop();                   //发送停止信号
  31. 	delay_ms(10);	// max time is 4.5ms
  32. 	return Multiple_read(0xF6);
  33. }
  34. //*************************************************************
  35. u16 bmp180ReadPressure(void)
  36. {
  37. 	int cnt = 0;
  38. 	IIC_Start();                   //起始信号
  39. 	IIC_Send_Byte(BMP180_SlaveAddress);   //发送设备地址+写信号
  40. 	cnt = 0;
  41. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  42. 	{
  43. 		cnt++;
  44. 		delay_ms(1);
  45. 		if(cnt>=100)return 1;
  46. 	} 
  47. 	IIC_Send_Byte(0xF4);	          // write register address
  48. 	cnt = 0;
  49. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  50. 	{
  51. 		cnt++;
  52. 		delay_ms(1);
  53. 		if(cnt>=100)return 1;
  54. 	} 
  55. 	IIC_Send_Byte(0x34);       	  // write register data for pressure
  56. 	cnt = 0;
  57. 	while(IIC_Wait_Ack())								//这边需要增加超时退出，避免卡死
  58. 	{
  59. 		cnt++;
  60. 		delay_ms(1);
  61. 		if(cnt>=100)return 1;
  62. 	} 
  63. 	IIC_Stop();                    //发送停止信号
  64. 	delay_ms(20);    	                  // max time is 4.5ms
  65. 	return Multiple_read(0xF6);//pressure;	
  66. }
  67.  
  68. //**************************************************************
  69.  
  70. //初始化BMP085，根据需要请参考pdf进行修改**************
  71. void Init_BMP180()
  72. {
  73. 	IIC_Init();
  74. 	ac1 = Multiple_read(0xAA);
  75. 	ac2 = Multiple_read(0xAC);
  76. 	ac3 = Multiple_read(0xAE);
  77. 	ac4 = Multiple_read(0xB0);
  78. 	ac5 = Multiple_read(0xB2);
  79. 	ac6 = Multiple_read(0xB4);
  80. 	b1 =  Multiple_read(0xB6);
  81. 	b2 =  Multiple_read(0xB8);
  82. 	mb =  Multiple_read(0xBA);
  83. 	mc =  Multiple_read(0xBC);
  84. 	md =  Multiple_read(0xBE);
  85. }
  86. //***********************************************************************
  87. void bmp180Convert()
  88. {
  89. 	unsigned int ut;
  90. 	unsigned long up;
  91. 	long x1, x2, b5, b6, x3, b3, p;
  92. 	unsigned long b4, b7;
  93.  
  94. 	ut = bmp180ReadTemp();	   // 读取温度
  95. 	up = bmp180ReadPressure();  // 读取压强    return pressure;	
  96. 	//*************
  97. 	x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
  98. 	x2 = ((long) mc << 11) / (x1 + md);
  99. 	b5 = x1 + x2;
  100. 	result_UT = ((b5 + 8) >> 4);
  101. 	//*************		
  102. 	b6 = b5 - 4000;
  103. 	                         // Calculate B3
  104. 	x1 = (b2 * (b6 * b6)>>12)>>11;
  105. 	x2 = (ac2 * b6)>>11;
  106. 	x3 = x1 + x2;
  107. 	b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;	
  108. 	                         // Calculate B4
  109. 	x1 = (ac3 * b6)>>13;
  110. 	x2 = (b1 * ((b6 * b6)>>12))>>16;
  111. 	x3 = ((x1 + x2) + 2)>>2;
  112. 	b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
  113. 	
  114. 	b7 = ((unsigned long)(up - b3) * (50000>>OSS));
  115. 	if (b7 < 0x80000000)
  116. 	p = (b7<<1)/b4;
  117. 	else
  118. 	p = (b7/b4)<<1;
  119. 	
  120. 	x1 = (p>>8) * (p>>8);
  121. 	x1 = (x1 * 3038)>>16;
  122. 	x2 = (-7357 * p)>>16;
  123. 	result_UP = p+((x1 + x2 + 3791)>>4);
  124. }
  125.  
  126.  
  127. /****************************************************************
  128. 　　　函数名称：BMP085_Get_Altitude			    
  129. 　　　函数功能：获取海拔高度值
  130. 　　　入口参数：无
  131. 　　　出口参数：altitude //int型  2字节，当前海拔高度值
  132. 　　　备 注：	 返回的高度值单位为厘米，调用时再换算成带小数的以米为单位的高度值
  133. *****************************************************************/
  134. double BMP085_Get_Altitude()
  135. {
  136. 	double altitude;
  137. 	//pressure=(float)pressure;				//获取气压值
  138. 	altitude=44330.0*(1-pow((double)result_UP/101325,1/5.255));  	//根据芯片手册提供的公式计算海拔高度
  139. 	//altitude*=100;	 		//转换成厘米单位的高度值，调用时再换算成带小数的高度值，提高精度
  140. 	return altitude;
  141. }

         实现效果：

         2）标准库硬件IIC实现气压值采集

  1. //向EEPROM写入一个字节
  2. int  BMP180_Byte_Write(uint8_t addr,uint8_t data) 
  3. {
  4. 	I2CTimeout = I2CT_LONG_TIMEOUT;
  5. 	while (I2C_GetFlagStatus(I2C1,  I2C_FLAG_BUSY))  //检查I2C总线是否繁忙
  6. 	{
  7.     if((I2CTimeout--) == 0) return 13;
  8.   } 
  9. 	//发送起始信号
  10. 	I2C_GenerateSTART(BMP180_I2C,ENABLE);
  11. 	//检测EV5事件
  12. 	I2CTimeout = I2CT_LONG_TIMEOUT;
  13. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_MODE_SELECT)==ERROR)
  14. 	{
  15.     if((I2CTimeout--) == 0) return 14;
  16.   } 
  17. 	//发送设备写地址
  18. 	I2C_Send7bitAddress(BMP180_I2C,BMP180_I2C_Address,I2C_Direction_Transmitter);
  19. 	//检测EV6事件
  20. 	I2CTimeout = I2CT_LONG_TIMEOUT;
  21. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR)
  22. 	{
  23.     if((I2CTimeout--) == 0) return 15;
  24.   } 
  25. 	//发送要操作设备内部的地址
  26. 	I2C_SendData(BMP180_I2C,addr);
  27. 	I2CTimeout = I2CT_LONG_TIMEOUT;
  28. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTING )==ERROR)
  29. 	{
  30.     if((I2CTimeout--) == 0) return 16;
  31.   } 
  32.   I2C_SendData(BMP180_I2C,data);
  33. 	//检测EV8_2事件
  34. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTED )==ERROR);
  35. 	//发送停止信号
  36. 	I2C_GenerateSTOP(BMP180_I2C,ENABLE);
  37. 	return 0;
  38. }
  39.  
  40.  
  41. //向EEPROM读取多个字节
  42. uint32_t BMP180_Read(uint8_t *data,uint8_t addr,uint16_t Num_ByteToRead)
  43. {
  44. 	 I2CTimeout = I2CT_LONG_TIMEOUT;
  45.   //判断IIC总线是否忙碌
  46.   while(I2C_GetFlagStatus(BMP180_I2C, I2C_FLAG_BUSY))   
  47.   {
  48.     if((I2CTimeout--) == 0) return 1;
  49.   } 
  50. 	
  51. 	I2CTimeout = I2CT_FLAG_TIMEOUT;
  52. 	//发送起始信号
  53. 	I2C_GenerateSTART(BMP180_I2C,ENABLE);
  54. 	//检测EV5事件
  55. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_MODE_SELECT )==ERROR)
  56.   {
  57.         if((I2CTimeout--) == 0) return 7;
  58.    } 
  59. 	
  60. 	I2CTimeout = I2CT_FLAG_TIMEOUT;
  61. 	//发送设备写地址
  62. 	I2C_Send7bitAddress(BMP180_I2C,BMP180_I2C_Address,I2C_Direction_Transmitter);
  63. 	//检测EV6事件等待从机应答
  64. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED )==ERROR)
  65.  {
  66.         if((I2CTimeout--) == 0) return 8;
  67.   }
  68.   
  69. 	I2CTimeout = I2CT_FLAG_TIMEOUT;
  70. 	//发送要操作设备内部存储器的地址
  71. 	I2C_SendData(BMP180_I2C,addr);
  72. 	//检测EV8事件
  73. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_BYTE_TRANSMITTING )==ERROR)
  74.  {
  75.         if((I2CTimeout--) == 0) return 9;
  76.   }
  77. 	I2CTimeout = I2CT_FLAG_TIMEOUT;
  78. 	//发送起始信号
  79. 	I2C_GenerateSTART(BMP180_I2C,ENABLE);
  80. 	//检测EV5事件
  81. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_MODE_SELECT )==ERROR)
  82. 	{
  83.         if((I2CTimeout--) == 0) return 10;
  84.    }
  85. 	I2CTimeout = I2CT_FLAG_TIMEOUT;	 
  86. 	//发送设备读地址
  87. 	I2C_Send7bitAddress(BMP180_I2C,BMP180_I2C_Address+1,I2C_Direction_Receiver);
  88. 	//检测EV6事件
  89. 	while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED )==ERROR)
  90. 	{
  91.        if((I2CTimeout--) == 0) return 11;
  92.    }
  93. 	 
  94. 	while(Num_ByteToRead--)
  95. 	{
  96. 		//是否是最后一个字节，若是则发送非应答信号
  97. 		if( Num_ByteToRead==0)
  98. 	 {
  99. 		 //发送非应答信号
  100. 		 I2C_AcknowledgeConfig(BMP180_I2C,DISABLE);
  101. 		 //发送停止信号
  102. 	   I2C_GenerateSTOP(BMP180_I2C,ENABLE);
  103. 	 }
  104. 	 
  105. 	 I2CTimeout = I2CT_FLAG_TIMEOUT;	 
  106. 	 //检测EV7事件
  107.    while( I2C_CheckEvent(BMP180_I2C,I2C_EVENT_MASTER_BYTE_RECEIVED )==ERROR)
  108.    {
  109.        if((I2CTimeout--) == 0) return 12;
  110.    }
  111. 	 
  112.     *data=I2C_ReceiveData(BMP180_I2C);
  113. 	  data++; 
  114. 	 
  115. 	}
  116. 	
  117. 	//重新开启应答信号
  118. 	I2C_AcknowledgeConfig(BMP180_I2C,ENABLE);
  119.   return 0;
  120. }
  121.  
  122.  
  123. void BMP180_Init(void)
  124. {
  125. 	u8 msb, lsb;
  126.   delay_ms(200);     // 1s,这里的延时很重要,上电后延时，没有错误的冗余设计
  127. 	
  128. 	BMP180_Read(&msb,0xAA,1);  
  129. 	BMP180_Read(&lsb,0xAB,1); 
  130. 	ac1 = (msb << 8)|lsb;
  131. 	BMP180_Read(&msb,0xAC,1);  
  132. 	BMP180_Read(&lsb,0xAD,1); 
  133. 	ac2 = (msb << 8)|lsb;
  134. 	BMP180_Read(&msb,0xAE,1);  
  135. 	BMP180_Read(&lsb,0xAF,1); 
  136. 	ac3 = (msb << 8)|lsb;
  137. 	BMP180_Read(&msb,0xB0,1);  
  138. 	BMP180_Read(&lsb,0xB1,1); 
  139. 	ac4 = (msb << 8)|lsb;
  140. 	BMP180_Read(&msb,0xB2,1);  
  141. 	BMP180_Read(&lsb,0xB3,1); 
  142. 	ac5 = (msb << 8)|lsb;
  143. 	BMP180_Read(&msb,0xB4,1);  
  144. 	BMP180_Read(&lsb,0xB5,1); 
  145. 	ac6 = (msb << 8)|lsb;
  146. 	BMP180_Read(&msb,0xB6,1);  
  147. 	BMP180_Read(&lsb,0xB7,1); 
  148. 	b1 = (msb << 8)|lsb;
  149. 	BMP180_Read(&msb,0xB8,1);  
  150. 	BMP180_Read(&lsb,0xB9,1); 
  151. 	b2 = (msb << 8)|lsb;
  152. 	BMP180_Read(&msb,0xBA,1);  
  153. 	BMP180_Read(&lsb,0xBB,1); 
  154. 	mb = (msb << 8)|lsb;
  155. 	BMP180_Read(&msb,0xBC,1);  
  156. 	BMP180_Read(&lsb,0xBD,1); 
  157. 	mc = (msb << 8)|lsb;
  158. 	BMP180_Read(&msb,0xBE,1);  
  159. 	BMP180_Read(&lsb,0xBF,1); 
  160. 	md = (msb << 8)|lsb;
  161. }
  162.  
  163. //********************************************************************
  164.  
  165. u16 bmp180ReadTemp(void)
  166. {
  167. 	u8 msb, lsb;
  168. 	//BMP180_Byte_Write(BMP180_SlaveAddress);   //发送设备地址+写信号   BMP180_SlaveAddress  0xee	气压传感器器件地址
  169. 	BMP180_Byte_Write(0xF4,0x2E);
  170. 	//BMP180_Byte_Write(0x2E);
  171. 	
  172. 	delay_ms(20);	// max time is 4.5ms
  173. 	BMP180_Read(&msb,0xF6,1);  
  174. 	BMP180_Read(&lsb,0xF7,1); 
  175. 	
  176. 	return (msb << 8)|lsb;
  177. }
  178. //*************************************************************
  179.  
  180. u16 bmp180ReadPressure(void)
  181. {
  182. 	u8 msb, lsb;
  183. 	//BMP180_Byte_Write(BMP180_SlaveAddress);   //发送设备地址+写信号
  184. 	BMP180_Byte_Write(0xF4,0x34);	          // write register address
  185. 	//BMP180_Byte_Write(0x34);       	  	// write register data for pressure
  186. 	
  187. 	delay_ms(20);    	                  // max time is 4.5ms
  188. 	BMP180_Read(&msb,0xF6,1);  
  189. 	BMP180_Read(&lsb,0xF7,1); 
  190. 	return (msb << 8)|lsb;
  191. }

实现效果：

         3）HAL库模拟IIC实现气压值采集

  1. //********************************************************************
  2. uint16_t bmp180ReadTemp(void)
  3. {
  4. 	int cnt = 0;
  5. 	BMP180_Start();                  //起始信号
  6. 	BMP180_SendByte(BMP180_SlaveAddress);   //发送设备地址+写信号   BMP180_SlaveAddress  0xee	气压传感器器件地址
  7. 	cnt = 0;
  8. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  9. 	{
  10. 		cnt++;
  11. 		Delay_mms(1); 
  12. 		if(cnt>=100)return 1;
  13. 	} 
  14. 	BMP180_SendByte(0xF4);	          // write register address
  15. 	cnt = 0;
  16. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  17. 	{
  18. 		cnt++;
  19. 		Delay_mms(1);
  20. 		if(cnt>=100)return 1;
  21. 	} 
  22. 	BMP180_SendByte(0x2E);       	// write register data for temp
  23. 	cnt = 0;
  24. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  25. 	{
  26. 		cnt++;
  27. 		Delay_mms(1);
  28. 		if(cnt>=100)return 1;
  29. 	} 
  30. 	BMP180_Stop();                   //发送停止信号
  31. 	Delay_mms(10);	// max time is 4.5ms
  32. 	return Multiple_read(0xF6);
  33. }
  34. //*************************************************************
  35. uint16_t bmp180ReadPressure(void)
  36. {
  37. 	int cnt = 0;
  38. 	BMP180_Start();                   //起始信号
  39. 	BMP180_SendByte(BMP180_SlaveAddress);   //发送设备地址+写信号
  40. 	cnt = 0;
  41. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  42. 	{
  43. 		cnt++;
  44. 		Delay_mms(1);
  45. 		if(cnt>=100)return 1;
  46. 	} 
  47. 	BMP180_SendByte(0xF4);	          // write register address
  48. 	cnt = 0;
  49. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  50. 	{
  51. 		cnt++;
  52. 		Delay_mms(1);
  53. 		if(cnt>=100)return 1;
  54. 	} 
  55. 	BMP180_SendByte(0x34);       	  // write register data for pressure
  56. 	cnt = 0;
  57. 	while(BMP180_RecvACK())								//这边需要增加超时退出，避免卡死
  58. 	{
  59. 		cnt++;
  60. 		Delay_mms(1);
  61. 		if(cnt>=100)return 1;
  62. 	} 
  63. 	BMP180_Stop();                    //发送停止信号
  64. 	Delay_mms(20);    	                  // max time is 4.5ms
  65. 	return Multiple_read(0xF6);//pressure;	
  66. }
  67.  
  68.  
  69.  
  70. //初始化BMP180，根据需要请参考pdf进行修改**************
  71. void Init_BMP180()
  72. {
  73. 	char str[100] = "";
  74. 	ac1 = Multiple_read(0xAA);
  75. 	ac2 = Multiple_read(0xAC);
  76. 	ac3 = Multiple_read(0xAE);
  77. 	ac4 = Multiple_read(0xB0);
  78. 	ac5 = Multiple_read(0xB2);
  79. 	ac6 = Multiple_read(0xB4);
  80. 	b1 =  Multiple_read(0xB6);
  81. 	b2 =  Multiple_read(0xB8);
  82. 	mb =  Multiple_read(0xBA);
  83. 	mc =  Multiple_read(0xBC);
  84. 	md =  Multiple_read(0xBE);
  85. 	
  86. 	sprintf(str,"ac1=%d ac2=%d ac3=%d ac4=%d ac5=%d ac6=%d b1=%d b2=%d mb=%d mc=%d md=%d\r\n",(int)ac1,(int)ac2,(int)ac3,(int)ac4,(int)ac5,(int)ac6,(int)b1,(int)b2,(int)mb,(int)mc,(int)md);
  87.   HAL_UART_Transmit(&huart1, (uint8_t *)str, (uint8_t)strlen(str), 5000);
  88. }
  89. //***********************************************************************
  90. void bmp180Convert()
  91. {
  92. 	unsigned int ut;
  93. 	unsigned long up;
  94. 	long x1, x2, b5, b6, x3, b3, p;
  95. 	unsigned long b4, b7;
  96.  
  97. 	ut = bmp180ReadTemp();	   // 读取温度
  98. 	up = bmp180ReadPressure();  // 读取压强    return pressure;	
  99. 	//*************
  100. 	x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
  101. 	x2 = ((long) mc << 11) / (x1 + md);
  102. 	b5 = x1 + x2;
  103. 	result_UT = ((b5 + 8) >> 4);
  104. 	//*************		
  105. 	b6 = b5 - 4000;
  106. 	                         // Calculate B3
  107. 	x1 = (b2 * (b6 * b6)>>12)>>11;
  108. 	x2 = (ac2 * b6)>>11;
  109. 	x3 = x1 + x2;
  110. 	b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;	
  111. 	                         // Calculate B4
  112. 	x1 = (ac3 * b6)>>13;
  113. 	x2 = (b1 * ((b6 * b6)>>12))>>16;
  114. 	x3 = ((x1 + x2) + 2)>>2;
  115. 	b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
  116. 	
  117. 	b7 = ((unsigned long)(up - b3) * (50000>>OSS));
  118. 	if (b7 < 0x80000000)
  119. 	p = (b7<<1)/b4;
  120. 	else
  121. 	p = (b7/b4)<<1;
  122. 	
  123. 	x1 = (p>>8) * (p>>8);
  124. 	x1 = (x1 * 3038)>>16;
  125. 	x2 = (-7357 * p)>>16;
  126. 	result_UP = p+((x1 + x2 + 3791)>>4);
  127. }
  128.  
  129.  
  130. /****************************************************************
  131. 　　　函数名称：BMP085_Get_Altitude			    
  132. 　　　函数功能：获取海拔高度值
  133. 　　　入口参数：无
  134. 　　　出口参数：altitude //int型  2字节，当前海拔高度值
  135. 　　　备 注：	 返回的高度值单位为厘米，调用时再换算成带小数的以米为单位的高度值
  136. *****************************************************************/
  137. //double BMP085_Get_Altitude()
  138. //{
  139. //	double altitude;
  140. //	//pressure=(float)pressure;				//获取气压值
  141. //	altitude=44330.0*(1-pow((double)pressure/101325,1/5.255));  	//根据芯片手册提供的公式计算海拔高度
  142. //	//altitude*=100;	 		//转换成厘米单位的高度值，调用时再换算成带小数的高度值，提高精度
  143. //	return altitude;
  144. //}

 实现效果：

        4）HAL库硬件IIC实现气压值采集

 

  1. //	在从设备指定内存中写数据
  2. void BMP180_WR_CMD(uint8_t cmd,uint8_t data)
  3. {
  4. 	//HAL_I2C_Master_Transmit(&hi2c1, BMP180_I2C_Address, &cmd,1, 0x100);
  5. 	HAL_I2C_Mem_Write(&hi2c1, BMP180_I2C_Address, cmd, I2C_MEMADD_SIZE_8BIT, &data, 1, 0x100);
  6. 	//HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout);
  7. 	//HAL_I2C_Mem_Write(&hi2c1 ,0x46,0x00,I2C_MEMADD_SIZE_8BIT,&cmd,1,0x100);
  8. }
  9.  
  10. //读数据
  11. void BMP180_READ_DATA(uint8_t cmd,uint8_t *data,uint16_t size)
  12. {
  13. 	HAL_I2C_Master_Transmit(&hi2c1, BMP180_I2C_Address, &cmd,size, 0x100);
  14. 	HAL_I2C_Master_Receive(&hi2c1, BMP180_I2C_Address+1, data,size, 0x100);
  15. }
  16.  
  17.  
  18. /**
  19.  @brief BH1750初始化函数
  20.  @param 无
  21.  @return 无
  22. */
  23. void BMP180_Init(void)
  24. {
  25. 	char str[100] = "";
  26. 	uint8_t msb, lsb;
  27.   HAL_Delay(200);     // 1s,这里的延时很重要,上电后延时，没有错误的冗余设计
  28. 	
  29. 	BMP180_READ_DATA(0xAA,&msb,1);
  30. 	BMP180_READ_DATA(0xAB,&lsb,1);
  31. 	ac1 = (msb << 8)|lsb;
  32. 	BMP180_READ_DATA(0xAC,&msb,1);
  33. 	BMP180_READ_DATA(0xAD,&lsb,1); 
  34. 	ac2 = (msb << 8)|lsb;
  35. 	BMP180_READ_DATA(0xAE,&msb,1);
  36. 	BMP180_READ_DATA(0xAF,&lsb,1); 
  37. 	ac3 = (msb << 8)|lsb;
  38. 	BMP180_READ_DATA(0xB0,&msb,1);
  39. 	BMP180_READ_DATA(0xB1,&lsb,1); 
  40. 	ac4 = (msb << 8)|lsb;
  41. 	BMP180_READ_DATA(0xB2,&msb,1);
  42. 	BMP180_READ_DATA(0xB3,&lsb,1); 
  43. 	ac5 = (msb << 8)|lsb;
  44. 	BMP180_READ_DATA(0xB4,&msb,1);
  45. 	BMP180_READ_DATA(0xB5,&lsb,1); 
  46. 	ac6 = (msb << 8)|lsb;
  47. 	BMP180_READ_DATA(0xB6,&msb,1);
  48. 	BMP180_READ_DATA(0xB7,&lsb,1); 
  49. 	b1 = (msb << 8)|lsb;
  50. 	BMP180_READ_DATA(0xB8,&msb,1);
  51. 	BMP180_READ_DATA(0xB9,&lsb,1); 
  52. 	b2 = (msb << 8)|lsb;
  53. 	BMP180_READ_DATA(0xBA,&msb,1);
  54. 	BMP180_READ_DATA(0xBB,&lsb,1);
  55. 	mb = (msb << 8)|lsb;
  56. 	BMP180_READ_DATA(0xBC,&msb,1);
  57. 	BMP180_READ_DATA(0xBD,&lsb,1);
  58. 	mc = (msb << 8)|lsb;
  59. 	BMP180_READ_DATA(0xBE,&msb,1);
  60. 	BMP180_READ_DATA(0xBF,&lsb,1);
  61. 	md = (msb << 8)|lsb;
  62. 	
  63. 	sprintf(str,"ac1=%d ac2=%d ac3=%d ac4=%d ac5=%d ac6=%d b1=%d b2=%d mb=%d mc=%d md=%d\r\n",(int)ac1,(int)ac2,(int)ac3,(int)ac4,(int)ac5,(int)ac6,(int)b1,(int)b2,(int)mb,(int)mc,(int)md);
  64.   HAL_UART_Transmit(&huart1, (uint8_t *)str, (uint8_t)strlen(str), 5000);
  65. }
  66.  
  67.  
  68. uint16_t bmp180ReadTemp(void)
  69. {
  70. 	uint8_t msb, lsb;
  71. 	//发送设备地址+写信号   BMP180_SlaveAddress  0xee	气压传感器器件地址
  72. 	BMP180_WR_CMD(0xF4,0x2E);
  73. 	
  74. 	HAL_Delay(20);	// max time is 4.5ms
  75. 	BMP180_READ_DATA(0xF6,&msb,1);  
  76. 	BMP180_READ_DATA(0xF7,&lsb,1); 
  77. 	
  78. 	return (msb << 8)|lsb;
  79. }
  80. //*************************************************************
  81.  
  82. uint16_t bmp180ReadPressure(void)
  83. {
  84. 	uint8_t msb, lsb;
  85. 	//发送设备地址+写信号
  86. 	BMP180_WR_CMD(0xF4,0x34);
  87. 	
  88. 	HAL_Delay(20);    	                  // max time is 4.5ms
  89. 	BMP180_READ_DATA(0xF6,&msb,1);  
  90. 	BMP180_READ_DATA(0xF7,&lsb,1); 
  91. 	return (msb << 8)|lsb;
  92. }
  93.  
  94.  
  95. //***********************************************************************
  96.  
  97. void bmp180Convert()
  98. {
  99. 	unsigned int ut;
  100. 	unsigned long up;
  101. 	long x1, x2, b5, b6, x3, b3, p;
  102. 	unsigned long b4, b7;
  103.  
  104. 	ut = bmp180ReadTemp();	   // 读取温度
  105. 	up = bmp180ReadPressure();  // 读取压强    return pressure;	
  106. 	//
  107. 	x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
  108. 	x2 = ((long) mc << 11) / (x1 + md);
  109. 	b5 = x1 + x2;
  110. 	result_UT = ((b5 + 8) >> 4);
  111. 	//	
  112. 	b6 = b5 - 4000;
  113. 	                         // Calculate B3
  114. 	x1 = (b2 * (b6 * b6)>>12)>>11;
  115. 	x2 = (ac2 * b6)>>11;
  116. 	x3 = x1 + x2;
  117. 	b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;	
  118. 	                         // Calculate B4
  119. 	x1 = (ac3 * b6)>>13;
  120. 	x2 = (b1 * ((b6 * b6)>>12))>>16;
  121. 	x3 = ((x1 + x2) + 2)>>2;
  122. 	b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
  123. 	
  124. 	b7 = ((unsigned long)(up - b3) * (50000>>OSS));
  125. 	if (b7 < 0x80000000)
  126. 	p = (b7<<1)/b4;
  127. 	else
  128. 	p = (b7/b4)<<1;
  129. 	
  130. 	x1 = (p>>8) * (p>>8);
  131. 	x1 = (x1 * 3038)>>16;
  132. 	x2 = (-7357 * p)>>16;
  133. 	result_UP = p+((x1 + x2 + 3791)>>4);
  134. }

实现效果：

资源下载链接：(20条消息) STM32实现气压传感器测量（BMP180）资源-CSDN文库

吾芯电子工作室

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