开发示例-获取环境温湿度

开发示例——获取环境温湿度新建文件夹，把文件夹命名为SHT30，文件夹下新建名为sht30.c和BUILD.gn的文件。1.编写sht30.c文件程序源码如下：#include<stdio.h>#include<unistd.h>#include"ohos_init.h"#include"cmsis_os2.h"#include"hi_io.h"#include"hi_gpio.h"#include"hi_i2c.h"#defineSHT30_ADDR

0x88

//地址总线#defineSHT30_BAUDRATE

40*1000

//I2C的波特率#defineSHT30_CONSTANT_1

175#defineSHT30_CONSTANT_2

45#defineSHT30_CONSTANT_3

100#defineBH1750_READ_DELAY_180MS180*1000

#defineBH1750_READ_DELAY_2S

2*1000*1000#defineI2C1_SDA_GPIOHI_GPIO_IDX_0#defineI2C1_SCL_GPIOHI_GPIO_IDX_1#defineIOT_I2C_IDX_11/**GPIO初始化**/staticvoidGPIO_Init(void){

hi_gpio_init();

//初始化io口

hi_io_set_func(I2C1_SDA_GPIO,HI_IO_FUNC_GPIO_0_I2C1_SDA);

//设置为I2C1的SDA引脚

hi_io_set_func(I2C1_SCL_GPIO,HI_IO_FUNC_GPIO_1_I2C1_SCL);

//设置为I2C1的SCL引脚

hi_i2c_init(IOT_I2C_IDX_1,SHT30_BAUDRATE);

//初始化I2C1}intSHT30_Reset(void){

intret;

uint8_tsend_data[2]={0x30,0xA2};

hi_i2c_datai2c_data;

i2c_data.receive_buf=NULL;

i2c_data.receive_len=0;

i2c_data.send_buf=send_data;

i2c_data.send_len=2;

ret=hi_i2c_write(IOT_I2C_IDX_1,SHT30_ADDR,&i2c_data);

//向SHT30写数据

if(ret!=0){

printf("====SHT30Resetfailed!====\r\n");

return-1;

}

return0;}/**SHT30初始化**/intSHT30_Init(void){

intret;

uint8_tsend_data[2]={0x22,0x36};

hi_i2c_datai2c_data;

i2c_data.receive_buf=NULL;

i2c_data.receive_len=0;

i2c_data.send_buf=send_data;

i2c_data.send_len=2;

ret=hi_i2c_write(IOT_I2C_IDX_1,SHT30_ADDR,&i2c_data);

//向BH1750写数据

if(ret!=0)

{

printf("===SHT30Initfailed!===\r\n");

return-1;

}

return0;}/**检查数据正确性**/staticintSHT30_CheckCrc(uint8_tdata[],uint8_tnbrOfBytes,uint8_tchecksum){

uint8_tcrc=0xFF;

uint8_tbit=0;

uint8_tbyteCtr;

constint16_tPOLYNOMIAL=0x131;

//calculates8-Bitchecksumwithgivenpolynomial

for(byteCtr=0;byteCtr<nbrOfBytes;++byteCtr){

crc^=(data[byteCtr]);

for(bit=8;bit>0;--bit){

if(crc&0x80)

crc=(crc<<1)^POLYNOMIAL;

else

crc=(crc<<1);

}

}

if(crc!=checksum)

return1;

else

return0;}/**温度计算**/staticfloatSHT30_CalcTempratureC(uint16_tu16st){

floattemperatureC=0; //variableforresult

u16st&=~0x0003;

//clearbits[1..0](statusbits)

//--calculatetemperature[℃]--temperatureC=(SHT30_CONSTANT_1*(float)u16st/0xffff-SHT30_CONSTANT_2);//T=-45+175*rawValue/(2^16-1)

returntemperatureC;}/**湿度计算**/staticfloatSHT30_CalcRH(uint16_tu16sRH){

floathumidityRH=0;//variableforresult

u16sRH&=~0x0003;

//clearbits[1..0](statusbits)

//--calculaterelativehumidity[%RH]--

humidityRH=(SHT30_CONSTANT_3*(float)u16sRH/0xffff);//RH=rawValue/(2^16-1)*10

returnhumidityRH;}/**读SHT30的数据**/intSHT30_ReadData(float*temp,float*humi){

intret;

uint8_tdata[3];//dataarrayforchecksumverification

uint16_tdat,tmp;

uint8_tSHT3X_Data_Buffer[6];//byte0,1istemperaturebyte4,5ishumidity

hi_i2c_datasht30_i2c_data={0};

uint8_tsend_data[2]={0xE0,0x00};

sht30_i2c_data.send_buf=send_data;

sht30_i2c_data.send_len=sizeof(send_data);

sht30_i2c_data.receive_buf=SHT3X_Data_Buffer;

sht30_i2c_data.receive_len=sizeof(SHT3X_Data_Buffer);ret=hi_i2c_writeread(IOT_I2C_IDX_1,SHT30_ADDR,&sht30_i2c_data);//Readbh1750sensordata

if(ret!=0)

{

printf("===SHT30Readdatafailed!===\r\n");

return-1;

}

/*checktem*/

data[0]=SHT3X_Data_Buffer[0];

data[1]=SHT3X_Data_Buffer[1];

data[2]=SHT3X_Data_Buffer[2];

tmp=SHT30_CheckCrc(data,2,data[2]);

/*valueistrue*/

if(!tmp){

dat=((uint16_t)data[0]<<8)|data[1];

*temp=SHT30_CalcTempratureC(dat);

}

/*checkhumidity*/

data[0]=SHT3X_Data_Buffer[3];

data[1]=SHT3X_Data_Buffer[4];

data[2]=SHT3X_Data_Buffer[5];

/*valueistrue*/

tmp=SHT30_CheckCrc(data,2,data[2]);

if(!tmp){

dat=((uint16_t)data[0]<<8)|data[1];

*humi=SHT30_CalcRH(dat);

}

return0;}staticvoid*SHT30Task(constchar*arg){

(void)arg;

floattemp,humi;

GPIO_Init();

//初始化GPIO

SHT30_Init();

//初始化SHT30

while(1)

{

SHT30_ReadData(&temp,&humi);

//读取BH1750的数据

printf("Temp:%.2f\n",temp);

printf("Humi:%.2f\r\n",humi);

usleep(BH1750_READ_DELAY_2S);

}

returnNULL;}staticvoidSHT30TaskEntry(void){

/**任务属性的结构体**/

osThreadAttr_tattr;

="SHT30Task";

//任务名称

attr.attr_bits=0U;

//任务的属性位

attr.cb_mem=NULL;

//任务控制块的内存初始地址，默认为系统自动分配

attr.cb_size=0U;

//任务控制块的内存大小

attr.stack_mem=NULL;

//任务的内存初始地址，默认为系统自动分配

attr.stack_size=4096;

//任务的内存大小

attr.priority=11;

//任务的优先级

/**创建任务**/

if(osThreadNew((osThreadFunc_t)SHT30Task,NULL,&attr)==NULL){

printf("[SHT30TaskEntry]FaliedtocreateSHT30Task!\n");

}}/**让系统运行指定的函数**/SYS_RUN(SHT30TaskEntry);2.编写BUILD.gn文件源码如下：static_library("SHT30"){sources=["sht30.c"]include_dirs=["//util