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#include "bmp180.h"
#include "delay.h"
#include "math.h"
#include "led.h"
#include "usart.h"
//存儲BMP180數據的結構
_bmp180 bmp180;
//BMP180初始化
//對使用的IIC端口進行初始化
void BMP_Init(void)
{
IIC_Init();
}
//寫一個數據到BMP180
void BMP_WriteOneByte(uint8_t WriteAddr,uint8_t DataToWrite)
{
IIC_Start();
IIC_Send_Byte(0xEE);//發送一個字節（地址為 Module address 0cEE）
IIC_Wait_Ack();//等待
IIC_Send_Byte(WriteAddr);//發送字節的地址
IIC_Wait_Ack();
IIC_Send_Byte(DataToWrite);//發送字節地址中的數據
IIC_Wait_Ack();
IIC_Stop();
}
//從BMP180讀一個字節數據
uint8_t BMP_ReadOneByte(uint8_t ReadAddr)
{
uint8_t data = 0;
IIC_Start();
IIC_Send_Byte(0xEE);
IIC_Wait_Ack();
IIC_Send_Byte(ReadAddr);
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(0xEF); //把讀取的字節存到下一個地址（0xef)中去
IIC_Wait_Ack();
data = IIC_Read_Byte(1); //讀取地址總的字節
IIC_Stop();
return data;
}
//從BMP180讀一個16位的數據
short BMP_ReadTwoByte(uint8_t ReadAddr)
{
short data;
uint8_t msb,lsb;
IIC_Start();
IIC_Send_Byte(0xEE);//發送字節（地址為 Module address 0cEE）
IIC_Wait_Ack();
IIC_Send_Byte(ReadAddr);
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(0xEF);//把讀取的字節存到下一個地址（0xef)中去
IIC_Wait_Ack();
msb = IIC_Read_Byte(1);//讀取16位的高八位
lsb = IIC_Read_Byte(0);//讀取16位的低八位
IIC_Stop();
data = msb*256 + lsb;//以16位的二進制數據給data
return data;
}
//從BMP180的獲取計算參數
void BMP_ReadCalibrationData(void)
{
bmp180.AC1 = BMP_ReadTwoByte(0xAA);
bmp180.AC2 = BMP_ReadTwoByte(0xAC);
bmp180.AC3 = BMP_ReadTwoByte(0xAE);
bmp180.AC4 = BMP_ReadTwoByte(0xB0);
bmp180.AC5 = BMP_ReadTwoByte(0xB2);
bmp180.AC6 = BMP_ReadTwoByte(0xB4);
bmp180.B1 = BMP_ReadTwoByte(0xB6);
bmp180.B2 = BMP_ReadTwoByte(0xB8);
bmp180.MB = BMP_ReadTwoByte(0xBA);
bmp180.MC = BMP_ReadTwoByte(0xBC);
bmp180.MD = BMP_ReadTwoByte(0xBE);
}
//從BMP180讀取未修正的溫度
long BMP_Read_UT(void)
{
long temp = 0;
BMP_WriteOneByte(0xF4,0x2E);
delay_ms(5);
temp = (long)BMP_ReadTwoByte(0xF6);
return temp;
}
//從BMP180讀取未修正的大氣壓
long BMP_Read_UP(void)
{
long pressure = 0;
BMP_WriteOneByte(0xF4,0x34);
delay_ms(5);
pressure = (long)BMP_ReadTwoByte(0xF6);
//pressure = pressure + BMP_ReadOneByte(0xf8);
pressure &= 0x0000FFFF; //位運算，將pressure中的高八位清0，低八位保留
return pressure;
}
//用獲取的參數對溫度和大氣壓進行修正，并計算海拔
void BMP_UncompemstatedToTrue(void)
{
bmp180.UT = BMP_Read_UT();//第一次讀取錯誤測試的實際的溫度值只有-78度海拔高度有2500多米（改變延時沒用）
bmp180.UT = BMP_Read_UT();//進行第二次讀取修正參數讀取兩次溫度值正確
bmp180.UP = BMP_Read_UP();//第一次讀取壓強值
/**--得到溫度值--**/
bmp180.X1 = ((bmp180.UT - bmp180.AC6) * bmp180.AC5) >> 15;
bmp180.X2 = (((long)bmp180.MC) << 11) / (bmp180.X1 + bmp180.MD);
bmp180.B5 = bmp180.X1 + bmp180.X2;
bmp180.Temp = (bmp180.B5 + 8) >> 4;
/**--得到氣壓值--**/
bmp180.B6 = bmp180.B5 - 4000;
bmp180.X1 = ((long)bmp180.B2 * (bmp180.B6 * bmp180.B6 >> 12)) >> 11;
bmp180.X2 = ((long)bmp180.AC2) * bmp180.B6 >> 11;
bmp180.X3 = bmp180.X1 + bmp180.X2;
bmp180.B3 = ((((long)bmp180.AC1) * 4 + bmp180.X3) + 2) /4;
bmp180.X1 = ((long)bmp180.AC3) * bmp180.B6 >> 13;
bmp180.X2 = (((long)bmp180.B1) *(bmp180.B6*bmp180.B6 >> 12)) >>16;
bmp180.X3 = ((bmp180.X1 + bmp180.X2) + 2) >> 2;
bmp180.B4 = ((long)bmp180.AC4) * (unsigned long)(bmp180.X3 + 32768) >> 15;
bmp180.B7 = ((unsigned long)bmp180.UP - bmp180.B3) * 50000;
if(bmp180.B7 < 0x80000000)
{
bmp180.p = (bmp180.B7 * 2) / bmp180.B4;
}
else
{
bmp180.p = (bmp180.B7 / bmp180.B4) * 2;
}
bmp180.X1 = (bmp180.p >> 8) * (bmp180.p >>8);
bmp180.X1 = (((long)bmp180.X1) * 3038) >> 16;
bmp180.X2 = (-7357 * bmp180.p) >> 16;
bmp180.p = bmp180.p + ((bmp180.X1 + bmp180.X2 + 3791) >> 4);
/**--得到海拔高度--**/
bmp180.altitude = 44330 * (1-pow(((bmp180.p) / 101325.0),(1.0/5.255)));
}
/**--串口顯示讀取到的數據--**/
void Show_Read_Data(void)
{
u8 ID = 0;
u16 i=0;
ID = BMP_ReadOneByte(0xd0);
BMP_UncompemstatedToTrue();
printf("ID = %d\t temp = %d.%dC\t Pressure = %ldPa\t Altitude = %.5fm\r\n",ID,bmp180.Temp/10,bmp180.Temp%10,bmp180.p,bmp180.altitude);
i++;
delay_ms(1000);
if(i==1)
{
LED0=!LED0;//燈閃爍，提示系統正在運行
i=0;
}
}

復制代碼

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