c语言float气压,STM32+MS5611测气压温度例程详解,测试无误[通俗易懂]

DELAY

#include “delay.h”

static u8 fac_us=0;//us延时倍乘数

static u16 fac_ms=0;//ms延时倍乘数,在ucos下,代表每个节拍的ms数

//初始化延迟函数

//SYSTICK的时钟固定为HCLK时钟的1/8

//SYSCLK:系统时钟

void delay_init()

{

SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);//选择外部时钟 HCLK/8

fac_us=SystemCoreClock/8000000;//为系统时钟的1/8

fac_ms=(u16)fac_us*1000;//非OS下,代表每个ms需要的systick时钟数

}

//延时nus

//nus为要延时的us数.

void delay_us(u32 nus)

{

u32 temp;

SysTick->LOAD=nus*fac_us; //时间加载

SysTick->VAL=0x00; //清空计数器

SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;//开始倒数

do

{

temp=SysTick->CTRL;

}while((temp&0x01)&&!(temp&(1<<16)));//等待时间到达

SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;//关闭计数器

SysTick->VAL =0X00; //清空计数器

}

//延时nms

//注意nms的范围

//SysTick->LOAD为24位寄存器,所以,最大延时为:

//nms<=0xffffff*8*1000/SYSCLK

//SYSCLK单位为Hz,nms单位为ms

//对72M条件下,nms<=1864

void delay_ms(u16 nms)

{

u32 temp;

SysTick->LOAD=(u32)nms*fac_ms;//时间加载(SysTick->LOAD为24bit)

SysTick->VAL =0x00;//清空计数器

SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;//开始倒数

do

{

temp=SysTick->CTRL;

}while((temp&0x01)&&!(temp&(1<<16)));//等待时间到达

SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;//关闭计数器

SysTick->VAL =0X00; //清空计数器

}

MS5611#include “MS5611.h”

/*宏定义——————————————————————*/

//定义器件在IIC总线中的从地址,根据CSB引脚不同修改

//#define MS561101BA_ADDR 0xec //CBR=1 0x76 I2C address when CSB is connected to HIGH (VCC)

#define MS561101BA_ADDR 0xee //CBR=0 0x77 I2C address when CSB is connected to LOW (GND)

// 定义MS561101BA内部地址

// registers of the device

#define MS561101BA_D1 0x40

#define MS561101BA_D2 0x50

#define MS561101BA_RESET 0x1E

// D1 and D2 result size (bytes)

#define MS561101BA_D1D2_SIZE 3

// OSR (Over Sampling Ratio) constants

#define MS561101BA_OSR_256 0x00

#define MS561101BA_OSR_512 0x02

#define MS561101BA_OSR_1024 0x04

#define MS561101BA_OSR_2048 0x06

#define MS561101BA_OSR_4096 0x08

//#define MS561101BA_D1_OSR_256 0x40

//#define MS561101BA_D1_OSR_512 0x42

//#define MS561101BA_D1_OSR_1024 0x44

//#define MS561101BA_D1_OSR_2048 0x46

#define MS561101BA_D1_OSR_4096 0x48

//#define MS561101BA_D2_OSR_256 0x50

//#define MS561101BA_D2_OSR_512 0x52

//#define MS561101BA_D2_OSR_1024 0x54

//#define MS561101BA_D2_OSR_2048 0x56

#define MS561101BA_D2_OSR_4096 0x58

#define MS561101BA_PROM_BASE_ADDR 0xA0 // by adding ints from 0 to 6 we can read all the prom configuration values.

// C1 will be at 0xA2 and all the subsequent are multiples of 2

#define MS561101BA_PROM_REG_COUNT 6 // number of registers in the PROM

#define MS561101BA_PROM_REG_SIZE 2 // size in bytes of a prom registry.

/*变量声明—————————————————————-*/

uint16_t Cal_C[7]; //用于存放PROM中的6组数据

uint32_t D1_Pres,D2_Temp; // 存放数字压力和温度

float Pressure;//温度补偿大气压

float dT,Temperature,Temperature2;//实际和参考温度之间的差异,实际温度,中间值

double OFF,SENS; //实际温度抵消,实际温度灵敏度

float Aux,OFF2,SENS2; //温度校验值

uint32_t ex_Pressure;//串口读数转换值

uint8_t exchange_num[8];

/*函数声明—————————————————————-*/

void MS561101BA_Reset(void);

void MS561101BA_readPROM(void);

uint32_t MS561101BA_DO_CONVERSION(u8 command);

void MS561101BA_GetTemperature(u8 OSR_Temp);

void MS561101BA_GetPressure(u8 OSR_Pres);

void MS561101BA_Init(void);

void SampleANDExchange(void);

/************************************************************

* 函数名:MS561101BA_Reset

* 描述 : 复位

* 输入 :无

* 输出 :无

*/

void MS561101BA_Reset(void)

{

I2C_NoAddr_WriteByte(MS561101BA_ADDR,MS561101BA_RESET);

}

/************************************************************

* 函数名:MS561101BA_readPROM

* 描述 : 从PROM读取出厂校准数据

* 输入 :无

* 输出 :无

*/

void MS561101BA_readPROM(void)

{ uint16_t value=0;u8 temp1[2]={0};

u8 i;

for (i=0;i<=MS561101BA_PROM_REG_COUNT;i++)

{

// I2C_Read_MultiBytes(MS561101BA_ADDR,MS561101BA_PROM_BASE_ADDR + (i * MS561101BA_PROM_REG_SIZE),2,temp1);

//value=temp1[0]<<8|temp1[1];

//Cal_C[i]=value;

Cal_C[i]=I2C_Read_2Bytes(MS561101BA_ADDR,MS561101BA_PROM_BASE_ADDR + (i * MS561101BA_PROM_REG_SIZE));

}

printf(“

The MS561101BA is reading PROM :

“);

printf(“

C1 = %d

C2 = %d

C3 = %d

C4 = %d

C5 = %d

C6 = %d

“,Cal_C[1],Cal_C[2],Cal_C[3],Cal_C[4],Cal_C[5],Cal_C[6]);

}

/************************************************************

* 函数名:MS561101BA_DO_CONVERSION

* 描述 :

* 输入 :无

* 输出 :无

*/

uint32_t MS561101BA_DO_CONVERSION(uint8_t command)

{

uint32_t conversion;

I2C_NoAddr_WriteByte(MS561101BA_ADDR,command);

delay_ms(10);//延时,去掉数据错误

conversion=I2C_Read_3Bytes(MS561101BA_ADDR,0);

return conversion;

}

/************************************************************

* 函数名:MS561101BA_GetTemperature

* 描述 : 读取数字温度

* 输入 :过采样率

* 输出 :无

*/

void MS561101BA_GetTemperature(u8 OSR_Temp)

{

D2_Temp= MS561101BA_DO_CONVERSION(OSR_Temp);

delay_ms(100);

dT=D2_Temp – (((uint32_t)Cal_C[5])<<8);

Temperature=2000+dT*((uint32_t)Cal_C[6])/8388608;//算出温度值的100倍，2001表示20.01°

}

/************************************************************

* 函数名:MS561101BA_GetPressure

* 描述 : 读取数字气压

* 输入 :过采样率

* 输出 :无

*/

void MS561101BA_GetPressure(u8 OSR_Pres)

{

D1_Pres= MS561101BA_DO_CONVERSION(OSR_Pres);

delay_ms(100);

OFF=(uint32_t)(Cal_C[2]<<16)+((uint32_t)Cal_C[4]*dT)/128.0;

SENS=(uint32_t)(Cal_C[1]<<15)+((uint32_t)Cal_C[3]*dT)/256.0;

//温度补偿

if(Temperature < 2000)// second order temperature compensation when under 20 degrees C

{

Temperature2 = (dT*dT) / 0x80000000;

Aux = (Temperature-2000)*(Temperature-2000);

OFF2 = 2.5*Aux;

SENS2 = 1.25*Aux;

if(Temperature < -1500)

{

Aux = (Temperature+1500)*(Temperature+1500);

OFF2 = OFF2 + 7*Aux;

SENS2 = SENS + 5.5*Aux;

}

}else //(Temperature > 2000)

{

Temperature2 = 0;

OFF2 = 0;

SENS2 = 0;

}

Temperature = Temperature – Temperature2;

OFF = OFF – OFF2;

SENS = SENS – SENS2;

Pressure=(D1_Pres*SENS/2097152.0-OFF)/32768.0;

}

/************************************************************

* 函数名:MS561101BA_Init

* 描述 : MS561101BA初始化

* 输入 :无

* 输出 :无

*/

void MS561101BA_Init(void)

{

MS561101BA_Reset();

delay_ms(100);

MS561101BA_readPROM();

delay_ms(100);

}

/************************************************************

* 函数名:SampleANDExchange

* 描述 : 读取数据并转换串口发送

* 输入 :无

* 输出 :无

*/

void SampleANDExchange(void)

{

uint8_t i=0;

MS561101BA_GetTemperature(MS561101BA_D2_OSR_4096);//0x58

MS561101BA_GetPressure(MS561101BA_D1_OSR_4096);//0x48

ex_Pressure=(long)(Pressure);

if(Pressure<0)

{

ex_Pressure=-ex_Pressure;

exchange_num[0]=’-‘;

}

else exchange_num[0]=’ ‘;

exchange_num[1]=ex_Pressure/100000+0x30;

ex_Pressure=ex_Pressure%100000;

exchange_num[2]=ex_Pressure/10000+0x30;

ex_Pressure=ex_Pressure%10000;

exchange_num[3]=ex_Pressure/1000+0x30;

ex_Pressure=ex_Pressure%1000;

exchange_num[4]=ex_Pressure/100+0x30;

ex_Pressure=ex_Pressure%100;

exchange_num[5]=’.’;

exchange_num[6]=ex_Pressure/10+0x30;

ex_Pressure=ex_Pressure%10;

exchange_num[7]=ex_Pressure+0x30;

printf(“

P : %c%c%c%c%c%c%c%c mbar

“,exchange_num[0],exchange_num[1],exchange_num[2],exchange_num[3],exchange_num[4],exchange_num[5],exchange_num[6],exchange_num[7]);

// for(i=0;i<8;i++)

// {

// printf(“%c”,exchange_num[i]);

// }

//printf(” mbar

“);

printf(“T : %4.3f °C

“,Temperature/100);

}

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