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本程序实现BMP280读取温度气压从串口发送的功能，分为直接赋值和printf两个版本，直接赋值版本使用定点计算，printf版本使用浮点计算，printf版本精度更高（示例：T=23.60335℃ P=100654.9Pa），BMP280在只读寄存器中有12个校准参数，均为16bit，地址为0x88~0xA1，但数据类型不同，具体请查看数据手册，其中3个温度校准参数，9个气压校准参数，用于校正每个BMP280的个体差异，这些参数在初始化时读取一次即可，在程序中要加载这些参数进行运算才能得到正确的测量值，实时读取的寄存器，温度地址为0xF7~0xF9，气压地址为0xFA~0xFC，均为20bit，数据类型为signed long，这两个值随温度和气压变化，要实时读取，这些值在数据手册中给出了测试值，用于验证算法是否正确，如需要验证，这些固定值取消注释即可，输出温度25.08℃，气压100653Pa，证明算法正确，当然本程序是已经验证过的。
单片机STC8G1K08A-8PIN，时钟频率11.0592MHz，UART1 9600bps 8N1，BMP280使用成品模块。
BMP280模块长这样：
串口和printf的使用见此连接：
https://www.stcaimcu.com/forum.php?mod=viewthread&tid=4598
附带部分中文数据手册，重要部分已翻译。
直接赋值版本：
/*----------------------------分割线----------------------------*/
#include <STC8G.H>
#include "define.h"
#include <intrins.h>
#include <string.h>
#define RXD P30
#define TXD P31
#define SCL P32
#define SDA P33
#define FOSC 11059200UL
#define BAUD 9600UL
#define BRT (0x10000-FOSC/BAUD/4)
#define T_Buffer_Len 64 //Uart1发送缓存长度
#define R_Buffer_Len 64 //Uart1接收缓存长度
#define BMP280_WRITE 0xEC
#define BMP280_READ 0xED
#define BMP280_PRESS_ADDR 0xF7
#define BMP280_PRESS_MSB 0xF7
#define BMP280_PRESS_LSB 0xF8
#define BMP280_PRESS_XLSB 0xF9
#define BMP280_TEMP_ADDR 0xFA
#define BMP280_TEMP_MSB 0xFA
#define BMP280_TEMP_LSB 0xFB
#define BMP280_TEMP_XLSB 0xFC
bit I2C_Busy;
unsigned char RP; //Uart1接收指针
unsigned char TP; //Uart1发送指针
unsigned char Uart_Send_Lenth; //Uart1发送长度
unsigned char xdata R_Buffer[R_Buffer_Len]; //Uart1接收缓存
unsigned char xdata T_Buffer[T_Buffer_Len]; //Uart1发送缓存
unsigned int Temp;
unsigned char code Hex_to_Ascii[16]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46};
unsigned int dig_T1;
signed int dig_T2;
signed int dig_T3;
unsigned int dig_P1;
signed int dig_P2;
signed int dig_P3;
signed int dig_P4;
signed int dig_P5;
signed int dig_P6;
signed int dig_P7;
signed int dig_P8;
signed int dig_P9;
signed long ADC_T,ADC_P;
/*----------------------------延时10us@STC-Y6@11.0592MHz----------------------------*/
void Delay_10us(void)
{
unsigned char i;
i=35;
while(--i);
}
/*----------------------------延时x10us----------------------------*/
void Delay_x10us(unsigned char x)
{
while(x--)
Delay_10us();
}
/*----------------------------延时10ms@STC-Y6@11.0592MHz----------------------------*/
void Delay_10ms(void)
{
unsigned char i,j;
_nop_();
_nop_();
i=144;
j=157;
do
{
while(--j);
}while(--i);
}
/*----------------------------延时x10ms----------------------------*/
void Delay_x10ms(unsigned char x)
{
while(x--)
Delay_10ms();
}
void UART_Send(unsigned int x)
{
TP=0;
Uart_Send_Lenth=x;
TI=1;
}
void I2C_Start(void)
{
I2C_Busy=1;
I2CMSCR=0x81;
while(I2C_Busy);
}
void I2C_SendData(unsigned char dat)
{
I2CTXD=dat;
I2C_Busy=1;
I2CMSCR=0x82;
while(I2C_Busy);
}
void I2C_RecvACK(void)
{
I2C_Busy=1;
I2CMSCR=0x83;
while(I2C_Busy);
}
unsigned char I2C_RecvData(void)
{
I2C_Busy=1;
I2CMSCR=0x84;
while(I2C_Busy);
return I2CRXD;
}
void I2C_SendACK(void)
{
I2CMSST=0x00;
I2C_Busy=1;
I2CMSCR=0x85;
while(I2C_Busy);
}
//void I2C_SendNAK(void)
//{
// I2CMSST=0x01;
// I2C_Busy=1;
// I2CMSCR=0x85;
// while(I2C_Busy);
//}
void I2C_Stop(void)
{
I2C_Busy=1;
I2CMSCR=0x86;
while(I2C_Busy);
}
void bmp280_WriteByte(unsigned char addr, unsigned char dat)
{
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_SendData(dat);
I2C_RecvACK();
I2C_Stop();
}
signed int Bmp280_Read_Two_Byte(unsigned char addr)
{
unsigned char msb,lsb;
int temp=0;
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_Start();
I2C_SendData(BMP280_READ);
I2C_RecvACK();
lsb=I2C_RecvData();
I2C_SendACK();
msb=I2C_RecvData();
I2C_Stop();
temp=(unsigned int)msb<<8;
temp|=(unsigned int)lsb;
return temp;
}
signed long Bmp280_Read_Three_Byte(unsigned char addr)
{
unsigned char msb,lsb,xlsb;
long temp=0;
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_Start();
I2C_SendData(BMP280_READ);
I2C_RecvACK();
msb=I2C_RecvData();
I2C_SendACK();
lsb=I2C_RecvData();
I2C_SendACK();
xlsb=I2C_RecvData();
I2C_Stop();
temp=(long)(((unsigned long)msb<<12)|((unsigned long)lsb<<4)|((unsigned long)xlsb>>4));
return temp;
}
//Returns temperature in DegC, float precision. Output value of “51.23” equals 51.23 DegC.
//t_fine carries fine temperature as global value
//float bmp280_compensate_T_float(long adc_T)
//{
// long t_fine;
// float var1,var2,T;
// var1=(((float)adc_T)/16384.0-((float)dig_T1)/1024.0)*((float)dig_T2);
// var2=((((float)adc_T)/131072.0-((float)dig_T1)/8192.0)*(((float)adc_T)/131072.0-((float) dig_T1)/8192.0))*((float)dig_T3);
// t_fine=(long)(var1+var2);
// T=(var1+var2)/5120.0;
// return T;
//}
//Returns pressure in Pa as float. Output value of “96386.2” equals 96386.2 Pa = 963.862 hPa
//float bmp280_compensate_P_float(long adc_P)
//{
// long t_fine;
// float var1,var2,p;
// var1=((float)t_fine/2.0)-64000.0;
// var2=var1*var1*((float)dig_P6)/32768.0;
// var2=var2+var1*((float)dig_P5)*2.0;
// var2=(var2/4.0)+(((float)dig_P4)*65536.0);
// var1=(((float)dig_P3) * var1 *var1/524288.0 +((float)dig_P2)*var1)/524288.0;
// var1=(1.0+var1/32768.0)*((float)dig_P1);
// if(var1==0.0)
// {
// return 0; //avoid exception caused by division by zero
// }
// p=1048576.0-(float)adc_P;
// p=(p-(var2/4096.0))*6250.0/var1;
// var1=((float)dig_P9)*p*p/2147483648.0;
// var2=p*((float)dig_P8)/32768.0;
// p=p+(var1+var2+((float)dig_P7))/16.0;
// return p;
//}
//Returns temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC.
//t_fine carries fine temperature as global value
signed long bmp280_compensate_T_int32(long adc_T)
{
long t_fine;
long var1,var2,T;
var1=((((adc_T>>3)-((long)dig_T1<<1)))*((long)dig_T2))>>11;
var2=(((((adc_T>>4)-((long)dig_T1))*((adc_T>>4)-((long)dig_T1)))>>12)*((long)dig_T3))>>14;
t_fine=var1+var2;
T=(t_fine*5+128)>>8;
return T;
}
//Returns pressure in Pa as unsigned 32 bit integer. Output value of “96386” equals 96386 Pa = 963.86 hPa
unsigned long bmp280_compensate_P_int32(long adc_P)
{
long t_fine;
long var1,var2;
unsigned long p;
var1=(((long)t_fine)>>1)-(long)64000;
var2=(((var1>>2)*(var1>>2))>>11)*((long)dig_P6);
var2=var2+((var1*((long)dig_P5))<<1);
var2=(var2>>2)+(((long)dig_P4)<<16);
var1=(((dig_P3*(((var1>>2)*(var1>>2))>>13))>>3)+((((long)dig_P2)*var1)>>1))>>18;
var1=((((32768+var1))*((long)dig_P1))>>15);
if(var1==0)
{
return 0; //avoid exception caused by division by zero
}
p=(((unsigned long)(((long)1048576)-adc_P)-(var2>>12)))*3125;
if(p<0x80000000)
{
p=(p<<1)/((unsigned long)var1);
}
else
{
p=(p/(unsigned long)var1)*2;
}
var1=(((long)dig_P9)*((long)(((p>>3)*(p>>3))>>13)))>>12;
var2=(((long)(p>>2))*((long)dig_P8))>>13;
p=(unsigned long)((long)p+((var1+var2+dig_P7)>>4));
return p;
}
void Bmp280_Read(void)
{
ADC_T=Bmp280_Read_Three_Byte(BMP280_TEMP_ADDR);
ADC_P=Bmp280_Read_Three_Byte(BMP280_PRESS_ADDR);
// ADC_T=519888;
// ADC_P=415148;
}
void Bmp280_Init(void)
{
bmp280_WriteByte(0xe0,0xb6);
Delay_x10us(100);
bmp280_WriteByte(0xf4,0xff);
bmp280_WriteByte(0xf5,0x00);
dig_T1=Bmp280_Read_Two_Byte(0x88);
dig_T2=Bmp280_Read_Two_Byte(0x8a);
dig_T3=Bmp280_Read_Two_Byte(0x8c);
dig_P1=Bmp280_Read_Two_Byte(0x8e);
dig_P2=Bmp280_Read_Two_Byte(0x90);
dig_P3=Bmp280_Read_Two_Byte(0x92);
dig_P4=Bmp280_Read_Two_Byte(0x94);
dig_P5=Bmp280_Read_Two_Byte(0x96);
dig_P6=Bmp280_Read_Two_Byte(0x98);
dig_P7=Bmp280_Read_Two_Byte(0x9a);
dig_P8=Bmp280_Read_Two_Byte(0x9c);
dig_P9=Bmp280_Read_Two_Byte(0x9e);
// dig_T1=27504;
// dig_T2=26435;
// dig_T3=-1000;
// dig_P1=36477;
// dig_P2=-10685;
// dig_P3=3024;
// dig_P4=2855;
// dig_P5=140;
// dig_P6=-7;
// dig_P7=15500;
// dig_P8=-14600;
// dig_P9=6000;
}
void Init(void)
{
P_SW2|=EAXFR;
P3M0=0x00;
P3M1=0x00;
P5M0=0x00;
P5M1=0x00;
P3PU=0x0c;
AUXR=0x40; //设置定时器0时钟为12T模式，设置定时器1为1T模式，设置定时器1为波特率发生器
TMOD=0x01; //设置定时器0为16位不自动重装载模式，设置定时器1为16位自动重装载模式
TL0=0x00; //设置定时器0初始值（5ms）
TH0=0xEE; //设置定时器0初始值（5ms）
TF0=0; //清除TF0中断标志位
ET0=1; //启用定时器0中断
SCON=0x50; //设置UART1模式为8位数据可变波特率
TL1=BRT; //设置UART1波特率
TH1=BRT>>8; //设置UART1波特率
TR1=1; //打开定时器1
ES=1; //启用UART1中断
I2CCFG=0xC6; //345.6K@11.0592M
I2CMSCR=EMSI;
I2CMSST=0x00;
EA=1; //启用总中断
Bmp280_Init();
}
void main(void)
{
unsigned long t,p;
Init();
while(1)
{
Bmp280_Read();
t=bmp280_compensate_T_int32(ADC_T);
p=bmp280_compensate_P_int32(ADC_P);
T_Buffer[0]='T';
T_Buffer[1]='=';
T_Buffer[2]=Hex_to_Ascii[t%10000/1000];
T_Buffer[3]=Hex_to_Ascii[t%1000/100];
T_Buffer[4]='.';
T_Buffer[5]=Hex_to_Ascii[t%100/10];
T_Buffer[6]=Hex_to_Ascii[t%10];
T_Buffer[7]='C';
T_Buffer[8]=' ';
T_Buffer[9]='P';
T_Buffer[10]='=';
T_Buffer[11]=Hex_to_Ascii[p%1000000/100000];
T_Buffer[12]=Hex_to_Ascii[p%100000/10000];
T_Buffer[13]=Hex_to_Ascii[p%10000/1000];
T_Buffer[14]='.';
T_Buffer[15]=Hex_to_Ascii[p%1000/100];
T_Buffer[16]=Hex_to_Ascii[p%100/10];
T_Buffer[17]=Hex_to_Ascii[p%10];
T_Buffer[18]='K';
T_Buffer[19]='P';
T_Buffer[20]='a';
T_Buffer[21]=0x0d;
T_Buffer[22]=0x0a;
UART_Send(23);
Delay_x10ms(10);
}
}
void Uart_Start(void)
{
TL0=0x00;
TH0=0xEE;
TR0=1;
}
void Uart_Stop(void)
{
TR0=0;
TL0=0x00;
TH0=0xEE;
RP=0;
memset(R_Buffer,0x00,sizeof R_Buffer);
}
void Timer0_Isr(void) interrupt 1
{
Uart_Stop();
}
void Uart_Isr(void) interrupt 4
{
if(RI)
{
RI=0;
Uart_Start();
R_Buffer[RP]=SBUF;
if(RP==R_Buffer_Len-1)
{
Uart_Stop();
}
else if(TR0)
{
RP++;
}
}
if(TI)
{
TI=0;
if(Uart_Send_Lenth!=0)
{
SBUF=(T_Buffer[TP]);
TP++;
}
if(TP==Uart_Send_Lenth)
{
TP=0;
Uart_Send_Lenth=0;
}
}
}
void I2C_Isr(void) interrupt 24
{
_push_(P_SW2);
P_SW2|=EAXFR;
if(I2CMSST&MSIF)
{
I2CMSST&=~MSIF;
I2C_Busy=0;
}
_pop_(P_SW2);
}
/*----------------------------分割线----------------------------*/
printf版本：
/*----------------------------分割线----------------------------*/
#include <STC8G.H>
#include "define.h"
#include <intrins.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#define RXD P30
#define TXD P31
#define SCL P32
#define SDA P33
#define FOSC 11059200UL
#define BAUD 9600UL
#define BRT (0x10000-FOSC/BAUD/4)
#define T_Buffer_Len 64 //Uart1发送缓存长度
#define R_Buffer_Len 64 //Uart1接收缓存长度
#define BMP280_WRITE 0xEC
#define BMP280_READ 0xED
#define BMP280_PRESS_ADDR 0xF7
#define BMP280_PRESS_MSB 0xF7
#define BMP280_PRESS_LSB 0xF8
#define BMP280_PRESS_XLSB 0xF9
#define BMP280_TEMP_ADDR 0xFA
#define BMP280_TEMP_MSB 0xFA
#define BMP280_TEMP_LSB 0xFB
#define BMP280_TEMP_XLSB 0xFC
bit I2C_Busy;
unsigned char RP; //Uart1接收指针
unsigned char TP; //Uart1发送指针
unsigned char Uart_Send_Lenth; //Uart1发送长度
unsigned char xdata R_Buffer[R_Buffer_Len]; //Uart1接收缓存
unsigned char xdata T_Buffer[T_Buffer_Len]; //Uart1发送缓存
unsigned int Temp;
unsigned char code Hex_to_Ascii[16]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46};
unsigned int xdata dig_T1;
signed int xdata dig_T2;
signed int xdata dig_T3;
unsigned int xdata dig_P1;
signed int xdata dig_P2;
signed int xdata dig_P3;
signed int xdata dig_P4;
signed int xdata dig_P5;
signed int xdata dig_P6;
signed int xdata dig_P7;
signed int xdata dig_P8;
signed int xdata dig_P9;
signed long xdata ADC_T,ADC_P;
/*----------------------------延时10us@STC-Y6@11.0592MHz----------------------------*/
void Delay_10us(void)
{
unsigned char i;
i=35;
while(--i);
}
/*----------------------------延时x10us----------------------------*/
void Delay_x10us(unsigned char x)
{
while(x--)
Delay_10us();
}
/*----------------------------延时10ms@STC-Y6@11.0592MHz----------------------------*/
void Delay_10ms(void)
{
unsigned char i,j;
_nop_();
_nop_();
i=144;
j=157;
do
{
while(--j);
}while(--i);
}
/*----------------------------延时x10ms----------------------------*/
void Delay_x10ms(unsigned char x)
{
while(x--)
Delay_10ms();
}
void UART_Send(unsigned int x)
{
TP=0;
Uart_Send_Lenth=x;
TI=1;
}
void Uart_Printf(unsigned char *v,...)
{
va_list ap;
va_start(ap,v);
UART_Send(vsprintf(T_Buffer,v,ap));
va_end(ap);
}
void I2C_Start(void)
{
I2C_Busy=1;
I2CMSCR=0x81;
while(I2C_Busy);
}
void I2C_SendData(unsigned char dat)
{
I2CTXD=dat;
I2C_Busy=1;
I2CMSCR=0x82;
while(I2C_Busy);
}
void I2C_RecvACK(void)
{
I2C_Busy=1;
I2CMSCR=0x83;
while(I2C_Busy);
}
unsigned char I2C_RecvData(void)
{
I2C_Busy=1;
I2CMSCR=0x84;
while(I2C_Busy);
return I2CRXD;
}
void I2C_SendACK(void)
{
I2CMSST=0x00;
I2C_Busy=1;
I2CMSCR=0x85;
while(I2C_Busy);
}
//void I2C_SendNAK(void)
//{
// I2CMSST=0x01;
// I2C_Busy=1;
// I2CMSCR=0x85;
// while(I2C_Busy);
//}
void I2C_Stop(void)
{
I2C_Busy=1;
I2CMSCR=0x86;
while(I2C_Busy);
}
void bmp280_WriteByte(unsigned char addr, unsigned char dat)
{
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_SendData(dat);
I2C_RecvACK();
I2C_Stop();
}
signed int Bmp280_Read_Two_Byte(unsigned char addr)
{
unsigned char msb,lsb;
int temp=0;
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_Start();
I2C_SendData(BMP280_READ);
I2C_RecvACK();
lsb=I2C_RecvData();
I2C_SendACK();
msb=I2C_RecvData();
I2C_Stop();
temp=(unsigned int)msb<<8;
temp|=(unsigned int)lsb;
return temp;
}
signed long Bmp280_Read_Three_Byte(unsigned char addr)
{
unsigned char msb,lsb,xlsb;
long temp=0;
I2C_Start();
I2C_SendData(BMP280_WRITE);
I2C_RecvACK();
I2C_SendData(addr);
I2C_RecvACK();
I2C_Start();
I2C_SendData(BMP280_READ);
I2C_RecvACK();
msb=I2C_RecvData();
I2C_SendACK();
lsb=I2C_RecvData();
I2C_SendACK();
xlsb=I2C_RecvData();
I2C_Stop();
temp=(long)(((unsigned long)msb<<12)|((unsigned long)lsb<<4)|((unsigned long)xlsb>>4));
return temp;
}
//Returns temperature in DegC, float precision. Output value of “51.23” equals 51.23 DegC.
//t_fine carries fine temperature as global value
float bmp280_compensate_T_float(long adc_T)
{
long t_fine;
float var1,var2,T;
var1=(((float)adc_T)/16384.0-((float)dig_T1)/1024.0)*((float)dig_T2);
var2=((((float)adc_T)/131072.0-((float)dig_T1)/8192.0)*(((float)adc_T)/131072.0-((float) dig_T1)/8192.0))*((float)dig_T3);
t_fine=(long)(var1+var2);
T=(var1+var2)/5120.0;
return T;
}
//Returns pressure in Pa as float. Output value of “96386.2” equals 96386.2 Pa = 963.862 hPa
float bmp280_compensate_P_float(long adc_P)
{
long t_fine;
float var1,var2,p;
var1=((float)t_fine/2.0)-64000.0;
var2=var1*var1*((float)dig_P6)/32768.0;
var2=var2+var1*((float)dig_P5)*2.0;
var2=(var2/4.0)+(((float)dig_P4)*65536.0);
var1=(((float)dig_P3) * var1 *var1/524288.0 +((float)dig_P2)*var1)/524288.0;
var1=(1.0+var1/32768.0)*((float)dig_P1);
if(var1==0.0)
{
return 0; //avoid exception caused by division by zero
}
p=1048576.0-(float)adc_P;
p=(p-(var2/4096.0))*6250.0/var1;
var1=((float)dig_P9)*p*p/2147483648.0;
var2=p*((float)dig_P8)/32768.0;
p=p+(var1+var2+((float)dig_P7))/16.0;
return p;
}
//Returns temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC.
//t_fine carries fine temperature as global value
//signed long bmp280_compensate_T_int32(long adc_T)
//{
// long t_fine;
// long var1,var2,T;
// var1=((((adc_T>>3)-((long)dig_T1<<1)))*((long)dig_T2))>>11;
// var2=(((((adc_T>>4)-((long)dig_T1))*((adc_T>>4)-((long)dig_T1)))>>12)*((long)dig_T3))>>14;
// t_fine=var1+var2;
// T=(t_fine*5+128)>>8;
// return T;
//}
//Returns pressure in Pa as unsigned 32 bit integer. Output value of “96386” equals 96386 Pa = 963.86 hPa
//unsigned long bmp280_compensate_P_int32(long adc_P)
//{
// long t_fine;
// long var1,var2;
// unsigned long p;
// var1=(((long)t_fine)>>1)-(long)64000;
// var2=(((var1>>2)*(var1>>2))>>11)*((long)dig_P6);
// var2=var2+((var1*((long)dig_P5))<<1);
// var2=(var2>>2)+(((long)dig_P4)<<16);
// var1=(((dig_P3*(((var1>>2)*(var1>>2))>>13))>>3)+((((long)dig_P2)*var1)>>1))>>18;
// var1=((((32768+var1))*((long)dig_P1))>>15);
// if(var1==0)
// {
// return 0; //avoid exception caused by division by zero
// }
// p=(((unsigned long)(((long)1048576)-adc_P)-(var2>>12)))*3125;
// if(p<0x80000000)
// {
// p=(p<<1)/((unsigned long)var1);
// }
// else
// {
// p=(p/(unsigned long)var1)*2;
// }
// var1=(((long)dig_P9)*((long)(((p>>3)*(p>>3))>>13)))>>12;
// var2=(((long)(p>>2))*((long)dig_P8))>>13;
// p=(unsigned long)((long)p+((var1+var2+dig_P7)>>4));
// return p;
//}
void Bmp280_Read(void)
{
ADC_T=Bmp280_Read_Three_Byte(BMP280_TEMP_ADDR);
ADC_P=Bmp280_Read_Three_Byte(BMP280_PRESS_ADDR);
// ADC_T=519888;
// ADC_P=415148;
}
void Bmp280_Init(void)
{
bmp280_WriteByte(0xe0,0xb6);
Delay_x10us(100);
bmp280_WriteByte(0xf4,0xff);
bmp280_WriteByte(0xf5,0x00);
dig_T1=Bmp280_Read_Two_Byte(0x88);
dig_T2=Bmp280_Read_Two_Byte(0x8a);
dig_T3=Bmp280_Read_Two_Byte(0x8c);
dig_P1=Bmp280_Read_Two_Byte(0x8e);
dig_P2=Bmp280_Read_Two_Byte(0x90);
dig_P3=Bmp280_Read_Two_Byte(0x92);
dig_P4=Bmp280_Read_Two_Byte(0x94);
dig_P5=Bmp280_Read_Two_Byte(0x96);
dig_P6=Bmp280_Read_Two_Byte(0x98);
dig_P7=Bmp280_Read_Two_Byte(0x9a);
dig_P8=Bmp280_Read_Two_Byte(0x9c);
dig_P9=Bmp280_Read_Two_Byte(0x9e);
// dig_T1=27504;
// dig_T2=26435;
// dig_T3=-1000;
// dig_P1=36477;
// dig_P2=-10685;
// dig_P3=3024;
// dig_P4=2855;
// dig_P5=140;
// dig_P6=-7;
// dig_P7=15500;
// dig_P8=-14600;
// dig_P9=6000;
}
void Init(void)
{
P_SW2|=EAXFR;
P3M0=0x00;
P3M1=0x00;
P5M0=0x00;
P5M1=0x00;
P3PU=0x0c;
AUXR=0x40; //设置定时器0时钟为12T模式，设置定时器1为1T模式，设置定时器1为波特率发生器
TMOD=0x01; //设置定时器0为16位不自动重装载模式，设置定时器1为16位自动重装载模式
TL0=0x00; //设置定时器0初始值（5ms）
TH0=0xEE; //设置定时器0初始值（5ms）
TF0=0; //清除TF0中断标志位
ET0=1; //启用定时器0中断
SCON=0x50; //设置UART1模式为8位数据可变波特率
TL1=BRT; //设置UART1波特率
TH1=BRT>>8; //设置UART1波特率
TR1=1; //打开定时器1
ES=1; //启用UART1中断
I2CCFG=0xC6; //345.6K@11.0592M
I2CMSCR=EMSI;
I2CMSST=0x00;
EA=1; //启用总中断
Bmp280_Init();
}
void main(void)
{
float t,p;
Init();
while(1)
{
Bmp280_Read();
t=bmp280_compensate_T_float(ADC_T);
p=bmp280_compensate_P_float(ADC_P);
Uart_Printf("T=%2.5f℃ P=%6.1fPa\r\n",t,p);
Delay_x10ms(5);
}
}
void Uart_Start(void)
{
TL0=0x00;
TH0=0xEE;
TR0=1;
}
void Uart_Stop(void)
{
TR0=0;
TL0=0x00;
TH0=0xEE;
RP=0;
memset(R_Buffer,0x00,sizeof R_Buffer);
}
void Timer0_Isr(void) interrupt 1
{
Uart_Stop();
}
void Uart_Isr(void) interrupt 4
{
if(RI)
{
RI=0;
Uart_Start();
R_Buffer[RP]=SBUF;
if(RP==R_Buffer_Len-1)
{
Uart_Stop();
}
else if(TR0)
{
RP++;
}
}
if(TI)
{
TI=0;
if(Uart_Send_Lenth!=0)
{
SBUF=(T_Buffer[TP]);
TP++;
}
if(TP==Uart_Send_Lenth)
{
TP=0;
Uart_Send_Lenth=0;
}
}
}
void I2C_Isr(void) interrupt 24
{
_push_(P_SW2);
P_SW2|=EAXFR;
if(I2CMSST&MSIF)
{
I2CMSST&=~MSIF;
I2C_Busy=0;
}
_pop_(P_SW2);
}
/*----------------------------分割线----------------------------*/
完整工程见附件：
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|手机版|小黑屋|深圳国芯人工智能有限公司
( 粤ICP备2022108929号-2 )
发表于 2023-10-11 20:42:39
发表于 2023-11-4 20:37:12
