[mw_shl_code=c,true]#include "iic.h"
#include "delay.h" //调用了延时函数
#include "usart.h"
#include <math.h>
//SCL -> PC1
//SDA -> PC2
#define SCL_H() GPIO_SetBits(GPIOC, GPIO_Pin_1)
#define SCL_L() GPIO_ResetBits(GPIOC, GPIO_Pin_1)
#define SDA_H() GPIO_SetBits(GPIOC, GPIO_Pin_2)
#define SDA_L() GPIO_ResetBits(GPIOC, GPIO_Pin_2)
#define SDA GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_2)
#define BMP180_SlaveAddr 0xee //BMP180的器件地址
//BMP180校准系数
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;
u8 BMP180_ID=0; //BMP180的ID
float True_Temp=0; //实际温度,单位:℃
float True_Press=0; //实际气压,单位
a
float True_Altitude=0; //实际高度,单位:m
/*外部芯片IIC引脚初始化
*SCL
C1
*SDA
C2
*/
void IIC_PortInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure; //定义一个GPIO_InitTypeDef类型的结构体
GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_1|GPIO_Pin_2); //PC1,PC2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //漏极开漏
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC, GPIO_Pin_1|GPIO_Pin_2); //拉高
}
void IIC_Init(void)
{
SCL_H(); //SCL = 1;
delay_us(5);
SDA_H(); //SDA = 1;
delay_us(5);
}
void IIC_Start(void)
{
SDA_H(); //SDA = 1;
delay_us(5);
SCL_H(); //SCL = 1;
delay_us(5);
SDA_L(); //SDA = 0;
delay_us(5);
}
void IIC_Stop(void)
{
SDA_L(); //SDA = 0;
delay_us(5);
SCL_H(); //SCL = 1;
delay_us(5);
SDA_H(); //SDA = 1;
delay_us(5);
}
unsigned char IIC_ReceiveACK(void)
{
unsigned char ACK;
SDA_H(); //SDA=1;//要读低电平需先拉高再读,否则读到的是错误数据,很重要！
SCL_H(); //SCL=1;
delay_us(5);
if (SDA==1) //SDA为高
{
ACK = 1;
}
else ACK = 0; //SDA为低
SCL_L(); //SCL = 0;//SCL为低电平时SDA上的数据才允许变化,为传送下一个字节做准备
delay_us(5);
return ACK;
}
void IIC_SendACK(unsigned char ack)
{
if (ack == 1)SDA_H();
else if (ack == 0)SDA_L();
//SDA = ack;
SCL_H(); //SCL = 1;
delay_us(5);
SCL_L(); //SCL = 0;
delay_us(5);
}
unsigned char IIC_SendByte(unsigned char dat)
{
unsigned char i;
unsigned char bResult=1;
SCL_L(); //SCL = 0;//拉低时钟线
delay_us(5);
for( i=0;i<8;i++ ) //一个SCK,把dat一位一位的移送到SDA上
{
if( (dat<<i)&0x80 )SDA_H(); //SDA = 1;//先发高位
else SDA_L(); //SDA = 0;
delay_us(5);
SCL_H(); //SCL = 1;
delay_us(5);
SCL_L(); //SCL = 0;
delay_us(5);
}
bResult=IIC_ReceiveACK(); //发送完一个字节的数据,等待接受应答信号
return bResult; //返回应答信号
}
unsigned char IIC_ReadByte(void)
{
unsigned char dat;
unsigned char i;
SCL_H(); //SCL = 1;//始终线拉高为读数据做准备
delay_us(5);
for( i=0;i<8;i++ )
{
dat <<= 1;
dat = dat | (SDA);
delay_us(5);
SCL_L(); //SCL = 0;
delay_us(5);
SCL_H(); //SCL = 1;
delay_us(5);
}
return dat;
}
/*从BMP180中读1个字节的数据*/
u8 BMP180_ReadOneByte(u8 ReadAddr)
{
u8 temp = 0;
u8 IIC_ComFlag = 1; //IIC通信标志,为0标志正常,1表示通信错误
IIC_Start(); //IIC start
IIC_ComFlag = IIC_SendByte(BMP180_SlaveAddr); //slave address+W:0
//printf("IIC_ComFlag=%u \r\n",IIC_ComFlag);
if (IIC_ComFlag == 0) //返回值为0表示通信正常,可以继续通信。否则不通信了
{
IIC_SendByte(ReadAddr); //发送命令代码
IIC_Start();
IIC_SendByte(BMP180_SlaveAddr|0x01); //slave address+R:1
temp = IIC_ReadByte(); //读数据
IIC_SendACK(1);
IIC_Stop();
}
return (temp);
}
/*从BMP180中读2个字节的数据*/
short BMP180_ReadTwoByte(u8 ReadAddr)
{
u8 IIC_ComFlag = 1; //IIC通信标志,为0标志正常,1表示通信错误
u8 MSB,LSB;
short temp;
IIC_Start();
IIC_ComFlag = IIC_SendByte(BMP180_SlaveAddr);
if (IIC_ComFlag == 0)
{
IIC_SendByte(ReadAddr);
IIC_Start();
IIC_SendByte(BMP180_SlaveAddr|0x01);
MSB = IIC_ReadByte(); //先读高位
IIC_SendACK(0); //ACK
LSB = IIC_ReadByte(); //再读低位
IIC_SendACK(1); //NACK
IIC_Stop();
}
temp = MSB*256+LSB;
return temp;
}
/*向BMP180的寄存器写一个字节的数据*/
void Write_OneByteToBMP180(u8 RegAdd, u8 Data)
{
IIC_Start(); //IIC start
IIC_SendByte(BMP180_SlaveAddr); //slave address+W:0
IIC_SendByte(RegAdd);
IIC_SendByte(Data);
IIC_Stop();
}
/*读取BMP180的校准系数*/
void Read_CalibrationData(void)
{
AC1 = BMP180_ReadTwoByte(0xaa);
AC2 = BMP180_ReadTwoByte(0xac);
AC3 = BMP180_ReadTwoByte(0xae);
AC4 = BMP180_ReadTwoByte(0xb0);
AC5 = BMP180_ReadTwoByte(0xb2);
AC6 = BMP180_ReadTwoByte(0xb4);
B1 = BMP180_ReadTwoByte(0xb6);
B2 = BMP180_ReadTwoByte(0xb8);
MB = BMP180_ReadTwoByte(0xba);
MC = BMP180_ReadTwoByte(0xbc);
MD = BMP180_ReadTwoByte(0xbe);
printf("AC1:%d \r\n",AC1);
printf("AC2:%d \r\n",AC2);
printf("AC3:%d \r\n",AC3);
printf("AC4:%d \r\n",AC4);
printf("AC5:%d \r\n",AC5);
printf("AC6:%d \r\n",AC6);
printf("B1:%d \r\n",B1);
printf("B2:%d \r\n",B2);
printf("MB:%d \r\n",MB);
printf("MC:%d \r\n",MC);
printf("MD:%d \r\n",MD);
}
/*读BMP180没有经过补偿的温度值*/
long Get_BMP180UT(void)
{
long UT;
Write_OneByteToBMP180(0xf4,0x2e); //write 0x2E into reg 0xf4
delay_ms(10); //wait 4.5ms
UT = BMP180_ReadTwoByte(0xf6); //read reg 0xF6(MSB),0xF7(LSB)
printf("UT:%ld \r\n",UT);
return UT;
}
/*读BMP180没有经过补偿的压力值*/
long Get_BMP180UP(void)
{
long UP=0;
Write_OneByteToBMP180(0xf4,0x34); //write 0x34 into reg 0xf4
delay_ms(10); //wait 4.5ms
UP = BMP180_ReadTwoByte(0xf6);
UP &= 0x0000FFFF;
printf("UP:%ld \r\n",UP);
return UP;
}
/*把未经过补偿的温度和压力值转换为时间的温度和压力值
*True_Temp:实际温度值,单位:℃
*True_Press:时间压力值,单位
a
*True_Altitude:实际海拔高度,单位:m
*/
void Convert_UncompensatedToTrue(long UT,long UP)
{
long X1,X2,X3,B3,B5,B6,B7,T,P;
unsigned long B4;
X1 = ((UT-AC6)*AC5)>>15; //printf("X1:%ld \r\n",X1);
X2 = ((long)MC<<11)/(X1+MD); //printf("X2:%ld \r\n",X2);
B5 = X1+X2; //printf("B5:%ld \r\n",B5);
T = (B5+8)>>4; //printf("T:%ld \r\n",T);
True_Temp = T/10.0; printf("Temperature:%.1f \r\n",True_Temp);
B6 = B5-4000; //printf("B6:%ld \r\n",B6);
X1 = (B2*B6*B6)>>23; //printf("X1:%ld \r\n",X1);
X2 = (AC2*B6)>>11; //printf("X2:%ld \r\n",X2);
X3 = X1+X2; //printf("X3:%ld \r\n",X3);
B3 = (((long)AC1*4+X3)+2)/4; //printf("B3:%ld \r\n",B3);
X1 = (AC3*B6)>>13; //printf("X1:%ld \r\n",X1);
X2 = (B1*(B6*B6>>12))>>16; //printf("X2:%ld \r\n",X2);
X3 = ((X1+X2)+2)>>2; //printf("X3:%ld \r\n",X3);
B4 = AC4*(unsigned long)(X3+32768)>>15; //printf("B4:%lu \r\n",B4);
B7 = ((unsigned long)UP-B3)*50000; //printf("B7:%lu \r\n",B7);
if (B7 < 0x80000000)
{
P = (B7*2)/B4;
}
else P=(B7/B4)*2; //printf("P:%ld \r\n",P);
X1 = (P/256.0)*(P/256.0); //printf("X1:%ld \r\n",X1);
X1 = (X1*3038)>>16; //printf("X1:%ld \r\n",X1);
X2 = (-7357*P)>>16; //printf("X2:%ld \r\n",X2);
P = P+((X1+X2+3791)>>4); //printf("P:%ld \r\n",P);
True_Press = P; printf("Press:%.1fPa \r\n",True_Press);
True_Altitude = 44330*(1-pow((P/101325.0),(1.0/5.255)));
printf("Altitude:%.3fm \r\n",True_Altitude);
}[/mw_shl_code]
[mw_shl_code=c,true]int main()
{
long UT,UP;
delay_init(); //延时函数初始化
NVIC_Configuration(); //设置NVIC中断分组2: 2位抢占优先级，2位响应优先级
uart1_init(38400); //串口1初始化,和上位机通信
System_Init(); //io,timer,adc,dac,lcd初始化
Read_CalibrationData(); //读取BMP180的校准系数
while(1)
{
BMP180_ID = BMP180_ReadOneByte(0xd0); //读取ID地址
printf("BMP180_ID:0x%x \r\n",BMP180_ID);
UT = Get_BMP180UT();
UP = Get_BMP180UP();
Convert_UncompensatedToTrue(UT,UP);
sprintf(LCD_Buff,"ID:0x%x",BMP180_ID); Lcd12864_WriteString(0,0,LCD_Buff);
sprintf(LCD_Buff,"Temp:%.1f'C",True_Temp); Lcd12864_WriteString(1,0,LCD_Buff);
sprintf(LCD_Buff,"Press:%.1fPa",True_Press); Lcd12864_WriteString(2,0,LCD_Buff);
sprintf(LCD_Buff,"Altitude:%.1fm",True_Altitude); Lcd12864_WriteString(3,0,LCD_Buff);
delay_ms(1000);[/mw_shl_code]
[mw_shl_code=c,true]
} [/mw_shl_code]
[mw_shl_code=c,true][/mw_shl_code]
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发表于 2015-4-14 17:15:02
发表于 2015-4-14 23:38:11
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