- #include <math.h>
- #include "delay.h"
- #include "myiic.h"
- #include "stdio.h"
- #define BME280_ADDRESS 0XEC
- unsigned long int hum_raw,temp_raw,pres_raw;
- signed long int t_fine;
- static float bme280PressureToAltitude(float* pressure/*, float* groundPressure, float* groundTemp*/);
- void writeReg(uint8_t reg_address, uint8_t data);
- void readData(void);
- void readTrim(void);
- uint16_t dig_T1;
- int16_t dig_T2;
- int16_t dig_T3;
- uint16_t dig_P1;
- int16_t dig_P2;
- int16_t dig_P3;
- int16_t dig_P4;
- int16_t dig_P5;
- int16_t dig_P6;
- int16_t dig_P7;
- int16_t dig_P8;
- int16_t dig_P9;
- int8_t dig_H1;
- int16_t dig_H2;
- int8_t dig_H3;
- int16_t dig_H4;
- int16_t dig_H5;
- int8_t dig_H6;
- void setup()
- {
- uint8_t osrs_t = 1; //Temperature oversampling x 1
- uint8_t osrs_p = 1; //Pressure oversampling x 1
- uint8_t osrs_h = 1; //Humidity oversampling x 1
- uint8_t mode = 3; //Normal mode
- uint8_t t_sb = 5; //Tstandby 1000ms
- uint8_t filter = 0; //Filter off
- uint8_t spi3w_en = 0; //3-wire SPI Disable
-
- uint8_t ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode;
- uint8_t config_reg = (t_sb << 5) | (filter << 2) | spi3w_en;
- uint8_t ctrl_hum_reg = osrs_h;
-
- writeReg(0xF2,ctrl_hum_reg);
- writeReg(0xF4,ctrl_meas_reg);
- writeReg(0xF5,config_reg);
- readTrim(); //
- }
- void readTrim(void)
- {
- uint8_t data[32];
-
- iicDevRead(BME280_ADDRESS,0x88,24,&data[0]);
- iicDevRead(BME280_ADDRESS,0xA1,1,&data[24]);
- iicDevRead(BME280_ADDRESS,0xE1,7,&data[25]);
- dig_T1 = (data[1] << 8) | data[0];
- dig_T2 = (data[3] << 8) | data[2];
- dig_T3 = (data[5] << 8) | data[4];
- dig_P1 = (data[7] << 8) | data[6];
- dig_P2 = (data[9] << 8) | data[8];
- dig_P3 = (data[11]<< 8) | data[10];
- dig_P4 = (data[13]<< 8) | data[12];
- dig_P5 = (data[15]<< 8) | data[14];
- dig_P6 = (data[17]<< 8) | data[16];
- dig_P7 = (data[19]<< 8) | data[18];
- dig_P8 = (data[21]<< 8) | data[20];
- dig_P9 = (data[23]<< 8) | data[22];
- dig_H1 = data[24];
- dig_H2 = (data[26]<< 8) | data[25];
- dig_H3 = data[27];
- dig_H4 = (data[28]<< 4) | (0x0F & data[29]);
- dig_H5 = (data[30] << 4) | ((data[29] >> 4) & 0x0F);
- dig_H6 = data[31];
-
- }
- void writeReg(uint8_t reg_address, uint8_t data)
- {
- iicDevWriteByte(BME280_ADDRESS,reg_address,data);
- }
- void readData(void)
- {
- u8 data[8];
- iicDevRead(BME280_ADDRESS,0xF7,8,data);
- pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
- temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
- hum_raw = (data[6] << 8) | data[7];
- }
- signed long int calibration_T(signed long int adc_T)
- {
-
- signed long int var1, var2, T;
- var1 = ((((adc_T >> 3) - ((signed long int)dig_T1<<1))) * ((signed long int)dig_T2)) >> 11;
- var2 = (((((adc_T >> 4) - ((signed long int)dig_T1)) * ((adc_T>>4) - ((signed long int)dig_T1))) >> 12) * ((signed long int)dig_T3)) >> 14;
-
- t_fine = var1 + var2;
- T = (t_fine * 5 + 128) >> 8;
- return T;
- }
- unsigned long int calibration_P(signed long int adc_P)
- {
- signed long int var1, var2;
- unsigned long int P;
- var1 = (((signed long int)t_fine)>>1) - (signed long int)64000;
- var2 = (((var1>>2) * (var1>>2)) >> 11) * ((signed long int)dig_P6);
- var2 = var2 + ((var1*((signed long int)dig_P5))<<1);
- var2 = (var2>>2)+(((signed long int)dig_P4)<<16);
- var1 = (((dig_P3 * (((var1>>2)*(var1>>2)) >> 13)) >>3) + ((((signed long int)dig_P2) * var1)>>1))>>18;
- var1 = ((((32768+var1))*((signed long int)dig_P1))>>15);
- if (var1 == 0)
- {
- return 0;
- }
- P = (((unsigned long int)(((signed long int)1048576)-adc_P)-(var2>>12)))*3125;
- if(P<0x80000000)
- {
- P = (P << 1) / ((unsigned long int) var1);
- }
- else
- {
- P = (P / (unsigned long int)var1) * 2;
- }
- var1 = (((signed long int)dig_P9) * ((signed long int)(((P>>3) * (P>>3))>>13)))>>12;
- var2 = (((signed long int)(P>>2)) * ((signed long int)dig_P8))>>13;
- P = (unsigned long int)((signed long int)P + ((var1 + var2 + dig_P7) >> 4));
- return P;
- }
- unsigned long int calibration_H(signed long int adc_H)
- {
- signed long int v_x1;
-
- v_x1 = (t_fine - ((signed long int)76800));
- v_x1 = (((((adc_H << 14) -(((signed long int)dig_H4) << 20) - (((signed long int)dig_H5) * v_x1)) +
- ((signed long int)16384)) >> 15) * (((((((v_x1 * ((signed long int)dig_H6)) >> 10) *
- (((v_x1 * ((signed long int)dig_H3)) >> 11) + ((signed long int) 32768))) >> 10) + (( signed long int)2097152)) *
- ((signed long int) dig_H2) + 8192) >> 14));
- v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * ((signed long int)dig_H1)) >> 4));
- v_x1 = (v_x1 < 0 ? 0 : v_x1);
- v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1);
- return (unsigned long int)(v_x1 >> 12);
- }
- void bme280Init(void)
- {
- IIC_Init(); /*初始化I2C*/
- delay_ms(20);
- setup();
- }
- void bme280GetData(float* pressure,float* temperature,float* humidity,float* asl)
- {
- double temp_act = 0.0, press_act = 0.0,hum_act=0.0;
- signed long int temp_cal;
- unsigned long int press_cal,hum_cal;
- readData();
-
- temp_cal = calibration_T(temp_raw);
- press_cal = calibration_P(pres_raw);
- hum_cal = calibration_H(hum_raw);
- temp_act = (double)temp_cal / 100.0;
- press_act = (double)press_cal / 100.0;
- hum_act = (double)hum_cal / 1024.0;
- printf("temp_raw:%ld\r\n",temp_raw);
- printf("pres_raw:%ld\r\n",pres_raw);
- printf("hum_raw:%ld\r\n",hum_raw);
- *temperature=temp_act; /*单位度*/
- *pressure=press_act; /*单位hPa*/
- *humidity=hum_act;
- *asl=bme280PressureToAltitude(pressure); /*转换成海拔*/
- }
- #define CONST_PF 0.1902630958 //(1/5.25588f) Pressure factor
- #define FIX_TEMP 25 // Fixed Temperature. ASL is a function of pressure and temperature, but as the temperature changes so much (blow a little towards the flie and watch it drop 5 degrees) it corrupts the ASL estimates.
- // TLDR: Adjusting for temp changes does more harm than good.
- /*
- * Converts pressure to altitude above sea level (ASL) in meters
- */
- static float bme280PressureToAltitude(float* pressure/*, float* groundPressure, float* groundTemp*/)
- {
- if (*pressure>0)
- {
- return((pow((1015.7f/ *pressure),CONST_PF)-1.0f)*(FIX_TEMP+273.15f))/0.0065f;
- }
- else
- {
- return 0;
- }
- }
复制代码
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "myiic.h"
#include "bme280.h"
int main(void)
{
float bmp280_temp;
float bmp280_press;
float bmp280_humi;
float high;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断优先级分组2
uart_init(9600); //初始化USART
LED_Init(); //初始化LED
IIC_Init();
delay_init();
bme280Init();
while(1)
{
bme280GetData(&bmp280_press,&bmp280_temp,&bmp280_humi,&high);
delay_ms(500);
LED0=!LED0;
printf("bmp280_press:%.3fkPa\r\n",bmp280_press/10.0);
delay_ms(100);
printf("bmp280_temp:%.3fC\r\n",bmp280_temp);
delay_ms(100);
printf("bmp280_humidity:%.3f%%\r\n",bmp280_humi);
delay_ms(100);
printf("bmp280_high:%.3fm\r\n\r\n",high);
}
}
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BME280_STM32.7z
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