开发示例-光照强度采集

开发示例——光照强度采集新建文件夹，把文件夹命名为BH1750，然后在文件夹下新建名为bh1750.c和BUILD.gn的文件。1.编写bh1750.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"#defineBH1750_ADDR

0x46

//地址总线#defineAHT20_BAUDRATE

40*1000

//I2C的波特率#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,AHT20_BAUDRATE);

//初始化I2C1}/**BH1750初始化**/intBH1750_Init(void){

intret;

uint8_tsend_data[1]={0x01};

hi_i2c_datai2c_data;

i2c_data.receive_buf=NULL;

i2c_data.receive_len=0;

i2c_data.send_buf=send_data;

i2c_data.send_len=1;

ret=hi_i2c_write(IOT_I2C_IDX_1,BH1750_ADDR,&i2c_data);

//向BH1750写数据

if(ret!=0)

{

printf("===BH1750InitError!===\r\n");

return-1;

}

return0;}/**读BH1750的数据**/intBH1750_ReadData(float*data){

intret;

uint8_trecv_data[2]={0};

uint8_tsend_data[1]={0x10};

hi_i2c_datai2c_data;

i2c_data.receive_buf=NULL;

i2c_data.receive_len=0;

i2c_data.send_buf=send_data;

i2c_data.send_len=1;

ret=hi_i2c_write(IOT_I2C_IDX_1,BH1750_ADDR,&i2c_data);

//启动BH1750

if(ret!=0)

{

printf("===BH1750Startfailed!===\r\n");

return-1;

}

usleep(BH1750_READ_DELAY_180MS);

i2c_data.receive_buf=recv_data;

i2c_data.receive_len=sizeof(recv_data);

i2c_data.send_buf=NULL;

i2c_data.send_len=0;

ret=hi_i2c_read(IOT_I2C_IDX_1,BH1750_ADDR,&i2c_data);

//读取采集到的数据

if(ret!=0)

{

printf("===BH1750Readfailed!===\r\n");

return-1;

}

*data=(float)(((recv_data[0]<<8)+recv_data[1])/1.2);//合成数据，即光照数据

return0;}staticvoid*BH1750Task(constchar*arg){

(void)arg;

floatlux;

GPIO_Init();

//初始化GPIO

BH1750_Init();

//初始化BH1750

while(1)

{

BH1750_ReadData(&lux);

//读取BH1750的数据

printf("Lux:%.2f\r\n",lux);

usleep(BH1750_READ_DELAY_2S);

}

returnNULL;}staticvoidBH1750TaskEntry(void){

/**任务属性的结构体**/

osThreadAttr_tattr;

="BH1750Task";

//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)BH1750Task,NULL,&attr)==NULL){

printf("[BH1750TaskEntry]FaliedtocreateBH1750Task!\n");

}}/**让系统运行指定的函数**/SYS_RUN(BH1750TaskEntry);2.编写BUILD.gn文件源码如下：static_library("BH1750"){sources=["bh1750.c"]include_dirs=["//utils/native/lite/include","//kernel/liteos_m/kal/cmsis","//device/hisilicon/hispark_pegasus/sdk_lite