STM32F4模拟I2C读写HTU21D程序

2019-07-20 08:19发布

///////////////////////htu21d.c///////////////////////////////////////////////////
#include "htu21d.h"
#include "myiic.h"
#include "delay.h"
#include "usart.h"
#include "lcd.h"
#include "text.h"

void HTU21D_SoftReset(void)
{
I2C1_Start();
I2C1_Send_Byte(0x80);
I2C1_Wait_Ack();
I2C1_Send_Byte(0xFE);
I2C1_Wait_Ack();
I2C1_Stop();
delay_ms(30);
}

void HTU21D_Init(void)
{
I2C1_Init();
delay_us(5);
HTU21D_SoftReset();
}

float HTU21D_Measure_Temperature_NHM(void)
{
u8 tmph, tmpl;
u16 tmp;
float temperature;

I2C1_Start();
I2C1_Send_Byte(0x80);
I2C1_Wait_Ack();
I2C1_Send_Byte(0xF3); //0xF3
I2C1_Wait_Ack();

do
{
delay_us(1000);
I2C1_Start();
I2C1_Send_Byte(0x81);
} while(I2C1_Poll_Ack());
//μè′y2aá¿½áêø

tmph = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
tmpl = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

tmp = (tmph<<8) + tmpl;
tmp &= ~0x0003;
temperature = ((float)(tmp) * 0.00268127) - 46.85; //temperature conversion

return temperature;
}

float HTU21D_Measure_Humidity_NHM(void)
{
u8 humh, huml;
u16 hum;
float humidity;
u8 ack;

I2C1_Start();
I2C1_Send_Byte(0x80);
I2C1_Wait_Ack();
I2C1_Send_Byte(0xF5); //0xF5
I2C1_Wait_Ack();

do
{
delay_us(500);
I2C1_Start();
I2C1_Send_Byte(0x81);
ack = I2C1_Poll_Ack();
} while(ack);
//μè′y2aá¿½áêø

humh = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
huml = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

hum = (humh<<8) + huml;
hum &= ~0x0003;
humidity = ((float)(hum) * 0.00190735) - 6; //humidity conversion

return humidity;
}

int float2str(float val, int precision, char *buf)
{
char *cur = NULL;
char *end = NULL;

if(!buf)
return -1;

if((precision >= 6) || (precision <0))
return -1;

switch(precision)
{
case 0:
sprintf(buf, "%.0f", val);
break;
case 1:
sprintf(buf, "%.1f", val);
break;
case 2:
sprintf(buf, "%.2f", val);
break;
case 3:
sprintf(buf, "%.3f", val);
break;
case 4:
sprintf(buf, "%.4f", val);
break;
case 5:
sprintf(buf, "%.5f", val);
break;
}

return 0;
}
/*
int float2str(float val, int precision, char *buf)
{
char *cur = NULL;
char *end = NULL;

if(!buf)
return -1;

if((precision >= 6) || (precision <0))
return -1;

switch(precision)
{
case 0:
sprintf(buf, "%.0f", val);
break;
case 1:
sprintf(buf, "%.1f", val);
break;
case 2:
sprintf(buf, "%.2f", val);
break;
case 3:
sprintf(buf, "%.3f", val);
break;
case 4:
sprintf(buf, "%.4f", val);
break;
case 5:
sprintf(buf, "%.5f", val);
break;
}

return 0;
}

void HTU21D_SoftReset(void)
{
I2C1_Start();
//I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Send_Byte(0x80);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_SOFT_RESET); //0xFE
I2C1_Wait_Ack();
I2C1_Stop();
delay_ms(50);
}

void HTU21D_Init(void)
{
I2C1_Init();
delay_us(1);
HTU21D_SoftReset();
}

float HTU21D_Measure_Temperature_HM(void)
{
u8 tmph, tmpl;
u16 tmp;
float temperature;

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_TRIG_TEMP_MEASUREMENT_HM); //0xE3
I2C1_Wait_Ack();

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x01);
I2C1_Poll_Ack();
//μè′y2aá¿½áêø
//I2C1_SCL = 1;
GPIO_Set(GPIOB, PIN10, GPIO_MODE_IN, GPIO_OTYPE_PP, GPIO_SPEED_2M, GPIO_PUPD_NONE); //PB10éèÖÃ
//SCL1_IN(); //SCLéèÖÃÎaêäèë
//delay_ms(80);
while(READ_SCL1 == 0)
{
delay_ms(2);
}
//delay_us(5);
GPIO_Set(GPIOB, PIN10, GPIO_MODE_OUT, GPIO_OTYPE_OD, GPIO_SPEED_50M, GPIO_PUPD_PU); //PB10éèÖÃ
//SCL1_OUT(); //SCLéèÖÃÎaêä3ö
tmph = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
tmpl = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

tmp = (tmph<<8) + tmpl;
tmp &= ~0x0003;
temperature = ((float)(tmp) * 0.00268127) - 46.85; //temperature conversion

return temperature;
}

float HTU21D_Measure_Humidity_HM(void)
{
u8 humh, huml;
u16 hum;
float humidity;

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_TRIG_HUMI_MEASUREMENT_HM); //0xE5
I2C1_Wait_Ack();

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x01);
I2C1_Poll_Ack();
//μè′y2aá¿½áêø
//I2C1_SCL = 1;
GPIO_Set(GPIOB, PIN10, GPIO_MODE_IN, GPIO_OTYPE_PP, GPIO_SPEED_2M, GPIO_PUPD_NONE); //PB10éèÖÃ
//SCL1_IN(); //SCLéèÖÃÎaêäèë
//delay_ms(50);
while(READ_SCL1 == 0)
{
delay_ms(2);
}
//delay_us(5);
GPIO_Set(GPIOB, PIN10, GPIO_MODE_OUT, GPIO_OTYPE_OD, GPIO_SPEED_50M, GPIO_PUPD_PU); //PB10éèÖÃ
//SCL1_OUT(); //SCLéèÖÃÎaêä3ö
humh = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
//huml = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
huml = I2C1_Recv_Byte(0); //Data(LSB),response with ACK
//I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

hum = (humh<<8) + huml;
hum &= ~0x0003;
humidity = ((float)(hum) * 0.00190735) - 6; //humidity conversion

return humidity;
}

float HTU21D_Measure_Temperature_NHM(void)
{
u8 tmph, tmpl;
u16 tmp;
float temperature;

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_TRIG_TEMP_MEASUREMENT_NHM); //0xF3
I2C1_Wait_Ack();

do
{
delay_us(1000);
I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x01);
} while(I2C1_Poll_Ack());
//μè′y2aá¿½áêø

tmph = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
tmpl = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

tmp = (tmph<<8) + tmpl;
tmp &= ~0x0003;
temperature = ((float)(tmp) * 0.00268127) - 46.85; //temperature conversion

return temperature;
}

float HTU21D_Measure_Humidity_NHM(void)
{
u8 humh, huml;
u16 hum;
float humidity;
u8 ack;

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_TRIG_HUMI_MEASUREMENT_NHM); //0xF5
I2C1_Wait_Ack();

do
{
delay_us(5000);
I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x01);
ack = I2C1_Poll_Ack();
} while(ack);
//μè′y2aá¿½áêø

humh = I2C1_Recv_Byte(1); //Data(MSB),response with ACK
huml = I2C1_Recv_Byte(1); //Data(LSB),response with ACK
I2C1_Recv_Byte(0); //Checksum,response without ACK

I2C1_Stop();

hum = (humh<<8) + huml;
hum &= ~0x0003;
humidity = ((float)(hum) * 0.00190735) - 6; //humidity conversion

return humidity;
}
*/
u8 HTU21D_Read_User_Register(void)
{
u8 reg_val;

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_READ_USER_REG); //0xE7
I2C1_Wait_Ack();

I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x01);
I2C1_Wait_Ack();
reg_val = I2C1_Recv_Byte(0);

I2C1_Stop();

return reg_val;
}

void HTU21D_Write_User_Register(u8 reg_val)
{
I2C1_Start();
I2C1_Send_Byte((HTU21D_DEVICE_ADDR<<1) | 0x00);
I2C1_Wait_Ack();
I2C1_Send_Byte(COMMAND_WRITE_USER_REG); //0xE6
I2C1_Wait_Ack();
I2C1_Send_Byte(reg_val);
I2C1_Wait_Ack();
I2C1_Stop();
}

void HTU21D_Test(void)
{
float tmp;
u8 val;
char buf[100] = {0};

#if 0
tmp = HTU21D_Measure_Temperature_HM();
printf("ÎÂ¶è1￡o%f ", tmp);
tmp = HTU21D_Measure_Humidity_HM();
printf("êa¶è1￡o%f ", tmp);
#endif
#if 1
tmp = HTU21D_Measure_Temperature_NHM();
printf("ÎÂ¶è2￡o%f ", tmp);
float2str((float)tmp, 1, buf);
LCD_Fill(150, 40, 479, 70, BLACK);
POINT_COLOR = RED; //éèÖÃ×ÖìåÎaoìé«
Show_Str(150, 40, 100, 30, (u8 *)buf, 24, 1);

tmp = HTU21D_Measure_Humidity_NHM();
printf("êa¶è2￡o%f ", tmp);
float2str((float)tmp, 1, buf);
LCD_Fill(150, 70, 479, 100, BLACK);
POINT_COLOR = GREEN; //éèÖÃ×ÖìåÎaÂìé«
Show_Str(150, 70, 100, 30, (u8 *)buf, 24, 1);
#endif
val = HTU21D_Read_User_Register();
printf("user register￡o0x%02x ", val);
}

/////////////////////////////htu21d.h///////////////////////////////////
#ifndef __HTU21D_H__
#define __HTU21D_H__

#include "sys.h"

#define HTU21D_DEVICE_ADDR 0x40
#define COMMAND_TRIG_TEMP_MEASUREMENT_HM 0xE3 //Trigger Temperature Measurement Command(Hold Master)
#define COMMAND_TRIG_HUMI_MEASUREMENT_HM 0xE5 //Trigger Humidity Measurement Command(Hold Master)
#define COMMAND_TRIG_TEMP_MEASUREMENT_NHM 0xF3 //Trigger Temperature Measurement Command(No Hold Master)
#define COMMAND_TRIG_HUMI_MEASUREMENT_NHM 0xF5 //Trigger Humidity Measurement Command(No Hold Master)
#define COMMAND_WRITE_USER_REG 0xE6 //Write user register
#define COMMAND_READ_USER_REG 0xE7 //Read user register
#define COMMAND_SOFT_RESET 0xFE //Soft Reset

void HTU21D_Init(void);
float HTU21D_Measure_Temperature_HM(void);
float HTU21D_Measure_Humidity_HM(void);
float HTU21D_Measure_Temperature_NHM(void);
float HTU21D_Measure_Humidity_NHM(void);
u8 HTU21D_Read_User_Register(void);
void HTU21D_Write_User_Register(u8 reg);
void HTU21D_SoftReset(void);
void HTU21D_Test(void);

#endif

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2条回答

店小迩

1楼-- · 2019-07-20 11:57

精彩回答 2 元偷偷看……

hgc121

2楼-- · 2019-07-20 14:52

精彩回答 2 元偷偷看……

STM32F4模拟I2C读写HTU21D程序

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