STM32f10x的BMP180模拟IIC（已调通）

/********************* BMP180驱动程序 2014-12-19 Leven 主要函数为BMP180_getdat(); 两种读取方法： 可以函数直接输出32位的数据 也可以直接调用全局变量，bmp180_temp,bmp180_press分别是温度和压强 说明： 压强数据最后两位是小数，单位是帕斯卡，数据大约是10170000 温度数据单位没留意，不过也用不上。。。。 温度和压强分别引入一阶和二阶低通滤波，压强的低通是分段的低通，当接近目标值时将上限截止频率降低 不想用滤波也可以将滤波的部分注释掉 *********************/ #include "bmp180.h" short ac1; short ac2; short ac3; unsigned short ac4; unsigned short ac5; unsigned short ac6; short b1; short b2; short mb; short mc; short md; s32 bmp180_temp,bmp180_press; /*********** 本程序用到的延时（4.5ms） 一共用了两次 ***********/ void BMP180_delay(void) { u32 count=200000; while(count--); } /**************** IIC与BMP180通讯驱动 ****************/ /* u8 Read_BMP180(u8 REG_Address) { u8 REG_data; IIC_Start(); //起始信号 IIC_Send_Byte(BMP180_Address); //发送设备地址+写信号 IIC_Wait_Ack(); IIC_Send_Byte(REG_Address); //发送存储单元地址，从0开始 IIC_Wait_Ack(); IIC_Start(); //起始信号 IIC_Send_Byte(BMP180_Address+1); //发送设备地址+读信号 IIC_Wait_Ack(); REG_data=IIC_Read_Byte(0); //读出寄存器数据 IIC_Stop(); //停止信号 return REG_data; } */ void Multiple_read_BMP180(u8 add,u8*BUF,u16 num) { u8 i; IIC_Start(); //起始信号 IIC_Send_Byte(BMP180_Address); //发送设备地址+写信号 IIC_Wait_Ack(); IIC_Send_Byte(add); //发送存储单元地址 IIC_Wait_Ack(); IIC_Start(); //起始信号 IIC_Send_Byte(BMP180_Address+1); //发送设备地址+读信号 IIC_Wait_Ack(); for (i=0; i<num; i++) //连续读取num个地址数据，存储中BUF { if (i == num-1) { BUF[i] = IIC_Read_Byte(0); //最后一个数据需要回NOACK } else { BUF[i] = IIC_Read_Byte(1); //返回ACK } } IIC_Stop(); //停止信号 } void Write_BMP180(u8 add, u8 da) { IIC_Start(); //起始信号 IIC_Send_Byte(BMP180_Address); //发送设备地址+写信号 IIC_Wait_Ack(); IIC_Send_Byte(add); //内部寄存器地址，请参考中文pdf IIC_Wait_Ack(); IIC_Send_Byte(da); //内部寄存器数据，请参考中文pdf IIC_Wait_Ack(); IIC_Stop(); //发送停止信号 } /* void Multiple_write_BMP180(u8 add,u8*BUF,u16 num) { while(num--) { Write_BMP180(add++, *BUF++); } } */ /*************** 上面是读取数据的驱动 下面开始读取数据 ***************/ /******************* 读取补偿数据 *******************/ void Read_calibration(void) { u8 buf[2]; Multiple_read_BMP180(0xaa,buf, 2); ac1 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xac,buf, 2); ac2 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xae,buf, 2); ac3 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xb0,buf, 2); ac4 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xb2,buf, 2); ac5 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xb4,buf, 2); ac6 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xb6,buf, 2); b1 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xb8,buf, 2); b2 = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xba,buf, 2); mb = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xbc,buf, 2); mc = buf[0] << 8 |buf[1]; Multiple_read_BMP180(0xbe,buf, 2); md = buf[0] << 8 |buf[1]; } /********************* 获取压强数据 *********************/ s32 BMP180_getdat(void) { long x1,x2,x3,b3,b5,b6,b7,UP,press,UT,temp; unsigned long b4; u8 ReadBuffer[3]; char oss = 0; //这个值在读气压时可以置进寄存器 static float press_fliter=101700,press_q=0.1,temp_fliter=20000,temp_q=0.1;//低通滤波&初值 //读取补偿数据 Read_calibration(); //读取原始温度数据 Write_BMP180(0xf4,0x2e); BMP180_delay(); //delay 4.5ms Multiple_read_BMP180(0xf6,ReadBuffer,2); UT = ReadBuffer[0] << 8 | ReadBuffer[1]; //读取原始压强数据 Write_BMP180(0xf4,(0x34 +(oss<<6))); BMP180_delay(); //delay 4.5ms Multiple_read_BMP180(0xf6,ReadBuffer,3); UP = ((ReadBuffer[0] << 16)+(ReadBuffer[1] << 8)+ReadBuffer[2]) >> (8 - oss); //温度换算 x1 = ((UT - ac6) * ac5) >> 15; x2 = ((long) mc << 11) / (x1 + md); b5 = x1 + x2; temp = ((b5 + 8)*100) >> 4;//*100是为了增加两位，temp即为读出数据 //开始滤波算法 temp_fliter = temp_fliter*(1-temp_q)+(float)temp*temp_q; bmp180_temp=temp_fliter; //压强换算 b6 = b5 - 4000; x1 = (b2 * ((b6 * b6) >> 12)) >> 11; x2 = (ac2 * b6) >> 11; x3 = x1 + x2; b3 = ((((long)ac1 * 4 + x3) << oss) + 2) / 4; x1 = (ac3 * b6) >> 13; x2 = (b1 * ((b6 * b6)>> 12)) >> 16; x3 = ((x1 + x2 )+ 2) >> 2; b4 = (ac4 * (unsigned long)(x3 + 32768)) >> 15; b7 = ((unsigned long)UP - b3) * (50000 >> oss); if(b7 < 0x80000000) press = (b7 * 2) / b4; else press = (b7 / b4 ) * 2; x1 = ((press) >> 8) * ((press) >> 8); x1 = (x1 * 3038) >> 16; x2 = (-7357 * press) >> 16; press = press + (((x1 + x2 + 3791)) >> 4);//press即为读出的数据 //开始滤波算法 if(fabs(press_fliter-press)<100)press_q=fabs(press_fliter-press)/1000; else press_q=0.1; press_fliter = press_fliter*(1-press_q)+(float)press*press_q; bmp180_press = press_fliter*100; return bmp180_press; }