【AT-START-F407测评】+使用RTThread的soft-I2C设备接口读取传感器

1万 · 2021-2-16 12:38

上次使用keil开发的I2C接口读取传感器数据 https://bbs.21ic.com/icview-3071262-1-1.html。这次试了下使用RTT-Studio开发I2C设备方式读取传感器。
在RT-Thread Studio打开新建基于RT-Thread的工程。

在RT-Thread Studio中配置组件，这里主要添加了软件模拟I2C组件读取传感器。

使能软件模拟I2C。

软件模拟I2C的引脚PB8和PB9。

初始化I2C，和I2C读写函数。

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    /* 查找I2C总线设备，获取I2C总线设备句柄 */

    i2c_bus = (struct rt_i2c_bus_device *)rt_device_find("i2c1");



    if (i2c_bus == RT_NULL)

    {

        rt_kprintf("can't find i21 device!\n");

    }

复制

void I2C_WriteByte(unsigned char dev_addr, unsigned int addr,unsigned char Byte)

{

    rt_uint8_t buf[4];

    struct rt_i2c_msg msgs;



    buf[0] = addr&0xff; //cmd

    buf[1] = Byte;



    msgs.addr = dev_addr;

    msgs.flags = RT_I2C_WR;

    msgs.buf = buf;

    msgs.len = 2;



    /* 调用I2C设备接口传输数据 */

    rt_i2c_transfer(i2c_bus, &msgs, 1);



}



unsigned char I2C_ReadByte(unsigned char dev_addr, unsigned int addr)

{  

    rt_uint8_t buf[4];

    struct rt_i2c_msg msgs[2];



    buf[0] = addr&0xff; //cmd

    msgs[0].addr = dev_addr;

    msgs[0].flags = RT_I2C_WR;

    msgs[0].buf = buf;

    msgs[0].len = 1;



    msgs[1].addr = dev_addr;

    msgs[1].flags = RT_I2C_RD;

    msgs[1].buf = buf;

    msgs[1].len = 1;



    /* 调用I2C设备接口传输数据 */

    rt_i2c_transfer(i2c_bus, msgs, 2);

        

        return buf[0];

}





void I2C_PageWrite(unsigned char dev_addr,unsigned int addr,unsigned char *str,unsigned int num)   

{

    rt_uint8_t buf[4];

    struct rt_i2c_msg msgs;



    buf[0] = addr&0xff; //cmd

    msgs.addr = dev_addr;

    msgs.flags = RT_I2C_WR;

    msgs.buf = buf;

    msgs.len = 1;

    /* 调用I2C设备接口传输数据 */

    rt_i2c_transfer(i2c_bus, &msgs, 1);



    msgs.addr = dev_addr;

    msgs.flags = RT_I2C_WR;

    msgs.buf = str;

    msgs.len = num;

    /* 调用I2C设备接口传输数据 */

    rt_i2c_transfer(i2c_bus, &msgs, 1);

}



void I2C_PageRead(unsigned char dev_addr,unsigned int addr,unsigned char *str,unsigned int num)

{

//    rt_uint8_t buf[4];

//    struct rt_i2c_msg msgs;

//

//    buf[0] = addr&0xff; //cmd

//    msgs.addr = dev_addr;

//    msgs.flags = RT_I2C_WR;

//    msgs.buf = buf;

//    msgs.len = 1;

//    /* 调用I2C设备接口传输数据 */

//    rt_i2c_transfer(i2c_bus, &msgs, 1);



//    msgs.addr = dev_addr;

//    msgs.flags = RT_I2C_RD;

//    msgs.buf = str;

//    msgs.len = num;

//    /* 调用I2C设备接口传输数据 */

//    rt_i2c_transfer(i2c_bus, &msgs, 1);



    rt_uint8_t buf[4];

    struct rt_i2c_msg msgs[2];



    buf[0] = addr&0xff; //cmd

    msgs[0].addr = dev_addr;

    msgs[0].flags = RT_I2C_WR;

    msgs[0].buf = buf;

    msgs[0].len = 1;



    msgs[1].addr = dev_addr;

    msgs[1].flags = RT_I2C_RD;

    msgs[1].buf = str;

    msgs[1].len = num;



    /* 调用I2C设备接口传输数据 */

    rt_i2c_transfer(i2c_bus, msgs, 2);

}

main主函数读取传感器数据：

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#include <rtthread.h>



#define DBG_TAG "main"

#define DBG_LVL DBG_LOG

#include <rtdbg.h>



#include <rtdevice.h>



#include "gpio_i2c.h"

#include "RPR-0521RS.h"

#include "BM1422AGMV.h"

#include "BM1383AGLV.h"



#ifndef LED2_PIN_NUM

    #define LED2_PIN_NUM            61  /* PD13 */

#endif

#ifndef LED3_PIN_NUM

    #define LED3_PIN_NUM            62  /* PD14 */

#endif

#ifndef LED4_PIN_NUM

    #define LED4_PIN_NUM            63    /* PD15 */

#endif



int main(void)

{

    uint8_t         utbuff[6];

    float press; float temp;

    uint16_t ps; float als;



    i2c_gpio_init();



    rt_pin_mode(LED2_PIN_NUM, PIN_MODE_OUTPUT);

    rt_pin_write(LED2_PIN_NUM, PIN_HIGH);

    rt_pin_mode(LED3_PIN_NUM, PIN_MODE_OUTPUT);

    rt_pin_write(LED3_PIN_NUM, PIN_HIGH);

    rt_pin_mode(LED4_PIN_NUM, PIN_MODE_OUTPUT);

    rt_pin_write(LED4_PIN_NUM, PIN_HIGH);



    if(RPR0521RS_Init() == 0)

    {

        rt_kprintf("RPR0521RS_Init OK\r\n");

    }

    if(BM1422AGMV_Init() == 0)

    {

        rt_kprintf("BM1422AGMV_Init OK\r\n");

    }

    if(BM1383AGLV_Init() == 0)

    {

        rt_kprintf("BM1383AGLV_Init OK\r\n");

    }



    while (1)

    {

        //LOG_D("Hello RT-Thread!");

        rt_thread_mdelay(500);

        rt_pin_write(LED4_PIN_NUM, PIN_HIGH);

        rt_pin_write(LED2_PIN_NUM, PIN_LOW);

        rt_thread_mdelay(500);

        rt_pin_write(LED2_PIN_NUM, PIN_HIGH);

        rt_pin_write(LED3_PIN_NUM, PIN_LOW);

        rt_thread_mdelay(500);

        rt_pin_write(LED3_PIN_NUM, PIN_HIGH);

        rt_pin_write(LED4_PIN_NUM, PIN_LOW);





        RPR0521RS_get_psalsval(&ps,&als);

        rt_kprintf("RPR0521RS:Lx=%u\t\tPs=%d\n",(uint16_t)als,ps);

        BM1383AGLV_get_val(&press,&temp);

        rt_kprintf("BM1383AGLV:P=%u\t\tTem=%u\n",(uint16_t)press,(uint16_t)temp);

        BM1422AGMV_get_rawdata(utbuff);

        rt_kprintf("BM1422AGMV:xx=%u\t\tyy=%u\t\tzz=%u\r\n\n",(uint16_t)(utbuff[1]<<8)|utbuff[0],

                                                        (uint16_t)(utbuff[3]<<8)|utbuff[2],

                                                        (uint16_t)(utbuff[5]<<8)|utbuff[4]);



   }



    return RT_EOK;

}