【国民技术N32WB452测评】第三期、在RT-Thread中使用I2C读取温湿度传感器数据

yang8555u

【国民技术N32WB452测评】第三期、在RT-Thread中使用I2C读取温湿度传感器数据 [复制链接]

<div class='showpostmsg'>本期主题是通过RT-Thread的I2C API，对板载的HDC2010温湿度传感器读取数据和手头上自备的一个HDC1080温湿度传感器读取数据。
默认N32的工程已经创建好，就不再重复描述。
#一、I2C配置
在工程根目录，打开RT-Thread Settings，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626054" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626054&handlekey=savephoto_626054">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

打开后，开启软件模拟I2C选项，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626055" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626055&handlekey=savephoto_626055">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

在硬件菜单配置中，使能软件模拟的I2C1，并设定引脚为47脚和48，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626056" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626056&handlekey=savephoto_626056">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

（该引脚的来由是板载的温湿度传感器HDC2010对应的I2C2_SDA/I2C2_SCL引脚，并参考drv_gpio.c）。
在开发板上J24/J23处，安装短路帽。
#二、HDC2010温湿度传感器驱动编写
参考HDC2010的官方手册，链接为：http://www.ti.com/cn/lit/gpn/hdc2010 。HDC2010的湿度精度为±2%，温度精度为典型值 ±0.2°C，算是性价比很高的一款器件。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626057" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626057&handlekey=savephoto_626057">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

在手册中，列出了HDC2010的I2C地址，我们右移一位后可得通信I2C地址为0x40（RT-Thread可自动移位地址以完成读写）

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626058" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626058&handlekey=savephoto_626058">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

手册中详细罗列了I2C读取的时序、操作。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626059" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626059&handlekey=savephoto_626059">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

在7.6章节，可以看到公开的寄存器地址及其说明，在本次实验中，我们需要的用到温度相关寄存器，湿度相关寄存器，配置相关寄存器，器件ID相关寄存器。其他寄存器暂未用到。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626060" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626060&handlekey=savephoto_626060">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

7.6.2章节，介绍了温度值转换实际温度的转换公式，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626061" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626061&handlekey=savephoto_626061">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

7.6.3章节，介绍了湿度值转换实际温度的转换公式，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626062" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626062&handlekey=savephoto_626062">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

7.6.17章节，介绍了配置的各个选项及其说明，如图：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626063" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626063&handlekey=savephoto_626063">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

在充分阅读手册后，我们的HDC2010驱动编写将会更加得心应手：
```c
#include <rtthread.h>
#include <rtdevice.h>
#include <stdio.h>
#define DBG_TAG "HDC2010"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
#define HW_ADR 0x40
rt_uint32_t test;
rt_uint32_t Illuminance_als;
static struct rt_i2c_bus_device *i2c_bus = RT_NULL;
rt_uint8_t temperature_reg[2];
rt_uint16_t temperature_raw = 0;
rt_uint8_t humidity_reg[2];
rt_uint16_t humidity_raw = 0;
double humidity = 0.0;
double temperature = 0.0;
#define THREAD_PRIORITY   25
#define THREAD_STACK_SIZE   2048
#define THREAD_TIMESLICE  5
static rt_thread_t tid1 = RT_NULL;
#define HDC2010_I2CBUS"i2c1"
#define HDC2010_TEMPERATURE_LOW     0x00  //0
#define HDC2010_TEMPERATURE_HIGH    0x01
#define HDC2010_HUMIDITY_LOW      0x02
#define HDC2010_HUMIDITY_HIGH       0x03
#define HDC2010_INTERRUPT_DRDY      0x04
//bit[7]:DataReady bit status
#defineDRDY_STATUS_NOT_READAY  0x00
#defineDRDY_STATUS_READAY    0x80
//bit[6]:Temperature threshold HIGH Interrupt status
#defineHH_STATUS_NO_INT    0x00
#defineHH_STATUS_INT     0x40
//bit[5]:Temperature threshold LOW Interrupt status
#defineHL_STATUS_NO_INT    0x00
#defineHL_STATUS_INT     0x20
//bit[4]:Humidity threshold HIGH Interrupt status
#defineTH_STATUS_NO_INT    0x00
#defineTH_STATUS_INT     0x10
//bit[3]:Humidity threshold LOW Interrupt status
#defineTL_STATUS_NO_INT    0x00
#defineTL_STATUS_INT     0x08

#define HDC2010_TEMPERATURE_MAX     0x05
#define HDC2010_HUMIDITY_MAX      0x06

#define HDC2010_INTERRUPT_MASK      0x07
//bit[7]:DataReady Interrupt mask
#defineDRDY_MASK_ENABLE    0x80
#defineDRDY_MASK_DISABLE   0x00
//bit[6]:Temperature threshold HIGH Interrupt mask
#defineTH_MASK_ENABLE    0x00
#defineTH_MASK_DISABLE     0x40
//bit[5]:Temperature threshold LOW Interrupt mask
#defineTL_MASK_ENABLE    0x00
#defineTL_MASK_DISABLE     0x20
//bit[4]:Humidity threshold HIGH Interrupt mask
#defineHH_MASK_ENABLE    0x00
#defineHH_MASK_DISABLE     0x10
//bit[3]:Humidity threshold HIGH Interrupt mask
#defineHL_MASK_ENABLE    0x00
#defineHL_MASK_DISABLE     0x08

#define HDC2010_TEMP_OFFSET_ADJUST    0x08
#define HDC2010_HUM_OFFSET_ADJUST     0x09
#define HDC2010_TEMP_THR_L        0x0A //0xFF
#define HDC2010_TEMP_THR_H        0x0B
#define HDC2010_RH_THR_L        0x0C //0xFF
#define HDC2010_RH_THR_H        0x0D

#define HDC2010_RESET_DRDY_INT_CONF     0x0E
//bit[7]:
#define SOFT_RES_NORMAL     0x00
#define SOFT_RES_SOFT     0x80
//bit[6:4]:Output Data Rate
#define ODR_NO        0x00   //000
#define ODR_1_120HZ     0x10   //001
#define ODR_1_60HZ      0x20   //010
#define ODR_0_1HZ       0x30   //011
#define ODR_0_2HZ       0x40   //100
#define ODR_1HZ       0x50   //101
#define ODR_2HZ       0x60   //110
#define ODR_5HZ       0x70   //111
//bit[3]:
#define HEAT_EN_ON      0x08
#define HEAT_EN_OFF     0x00
//bit[2]:DRDY/INT_EN pin configuration
#define DRDY_OR_INT_EN_ENABLE   0x04
#define DRDY_OR_INT_EN_HIGH_Z   0x00
//bit[1]:Interrupt polarity
#define INT_POL_LOW     0x00
#define INT_POL_HIGH      0x02
//bit[0]:Interrupt mode
#define INT_MODE_LEVEL    0x00
#define INT_MODE_COMPARAM   0x01

#define HDC2010_MEASUREMENT_CONF      0x0F
//bit[7:6]:Temperature resolution
#defineTEM_RES_14BIT    0x00   //00
#defineTEM_RES_11BIT    0x40   //01
#defineTEM_RES_9BIT     0x80   //10
//bit[5:4]:Humidity resolution
#defineHUM_RES_14BIT    0x00   //00
#defineHUM_RES_11BIT    0x10   //01
#defineHUM_RES_9BIT     0x20   //10
//bit[3]:res
//bit[2:1]:Measurement configuration
#defineMEAS_CONF_TEM_HUM   0x00    //00
#defineMEAS_CONF_TEM_ONLY  0x02    //01
#defineMEAS_CONF_HUM_ONLY  0x04    //10
//bit[0]:Measurement trigger
#defineMEAS_TRIG_START   0x01
#defineMEAS_TRIG_NO_ACTION 0x00

#define HDC2010_MANUFACTURER_ID_LOW     0xFC  //0x49
#define HDC2010_MANUFACTURER_ID_HIGH    0xFD  //0x54
#define HDC2010_DEVICE_ID_LOW       0xFE  //0xD0
#define HDC2010_DEVICE_ID_HIGH      0xFF  //0x07
static rt_err_t hdc2010_write(struct rt_i2c_bus_device *bus, uint8_t hwadr, uint8_t reg, rt_uint8_t *data)
{
  rt_uint8_t buf[3];
  struct rt_i2c_msg msgs;
  rt_uint32_t buf_size = 1;
  buf[0] = reg; //cmd
  if (data != RT_NULL)
  {
  buf[1] = data[0];
  buf[2] = data[1];
  buf_size = 3;
  }

msgs.addr = hwadr;
  msgs.flags = RT_I2C_WR;
  msgs.buf = buf;
  msgs.len = buf_size;

if (rt_i2c_transfer(bus, &msgs, 1) == 1)
  {
  return RT_EOK;
  }
  else
  {
  return -RT_ERROR;
  }
}
rt_err_t read_regs(struct rt_i2c_bus_device *bus, uint8_t reg, rt_uint8_t *data)
{
  struct rt_i2c_msg msgs[2];
  rt_int8_t res = 0;
  msgs[0].addr = HW_ADR; /* Slave address */
  msgs[0].flags = RT_I2C_WR; /* Write flag */
  msgs[0].buf = ® /* Slave register address */
  msgs[0].len = 1; /* Number of bytes sent */

msgs[1].addr = HW_ADR; /* Slave address */
  msgs[1].flags = RT_I2C_RD; /* Read flag */
  msgs[1].buf = data; /* Read data pointer */
  msgs[1].len = 2; /* Number of bytes read */

if (rt_i2c_transfer((struct rt_i2c_bus_device *) bus, msgs, 2) == 2)
  {
  res = RT_EOK;
  }
  else
  {
  res = -RT_ERROR;
  }
}
void hdc2010_init(const char *name)
{
  rt_uint8_t CMD[3];

i2c_bus = (struct rt_i2c_bus_device *) rt_device_find(name);
  if (i2c_bus == RT_NULL)
  {
  rt_kprintf("can't find %s device!\n",name);
  }
  else
  {
  rt_uint8_t DEVICE_ID[2];
  read_regs(i2c_bus, HDC2010_DEVICE_ID_LOW, DEVICE_ID);
  if (DEVICE_ID[0] == 0xD0 & DEVICE_ID[1] == 0x7)
  {
    rt_kprintf("hdc2010 read id success\n");
    CMD[0] = SOFT_RES_NORMAL | ODR_2HZ | HEAT_EN_OFF | DRDY_OR_INT_EN_HIGH_Z;
    CMD[1] = TEM_RES_14BIT | HUM_RES_14BIT | MEAS_CONF_TEM_HUM | MEAS_TRIG_START;
    hdc2010_write(i2c_bus, HW_ADR, HDC2010_RESET_DRDY_INT_CONF, CMD);
    rt_kprintf("hdc2010 init success\n");
  }
  rt_thread_mdelay(500);
  }
}
void hdc2010_get_data()
{
  read_regs(i2c_bus, HDC2010_TEMPERATURE_LOW, temperature_reg);
  temperature_raw = temperature_reg[0] + temperature_reg[1] * 256;
  temperature = (double) temperature_raw / 65536;
  temperature = temperature * 165 - 40;
  read_regs(i2c_bus, HDC2010_HUMIDITY_LOW, humidity_reg);
  humidity_raw = humidity_reg[0] + humidity_reg[1] * 256;
  humidity = (double) humidity_raw / 65536*100;
  LOG_I("temperature = %d.%d,humidity = %d.%d\n", (int )temperature, (int )(temperature * 10) % 10,(int )humidity, (int )(humidity * 10) % 10);
}
static void hdc2010_collect_thread_entry(void *parameter)
{
  hdc2010_init(HDC2010_I2CBUS);
  while(1)
  {
  hdc2010_get_data();
  rt_thread_mdelay(500);
  }
}
int hdc2010_collect(void)
{
  /* 创建线程*/
  tid1 = rt_thread_create("hdc2010_collect_thread", hdc2010_collect_thread_entry, RT_NULL, THREAD_STACK_SIZE,
    THREAD_PRIORITY, THREAD_TIMESLICE);

/* 如果获得线程控制块，启动这个线程 */
  if (tid1 != RT_NULL)
  rt_thread_startup(tid1);

return 0;
}

```
在main.c中调用：
```c
#include <stdint.h>
#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtthread.h>
#include <rtdevice.h>
#include <stdio.h>
#include <rtdbg.h>
#include <ulog.h>
/* defined the D1pin: PD0
 * defined the D10 pin: PD1
 * defined the D11 pin: PE2
 * defined the D12 pin: PE3
 **/
extern int hdc2010_collect(void);
#define D1_PIN  81
#define D10_PIN 82
#define D11_PIN 1
#define D12_PIN 2
#define K04_PIN 55
int main(void)
{
  uint32_t Speed = 200;
  /* set D12 pin mode to output */
  rt_pin_mode(D12_PIN, PIN_MODE_OUTPUT);
  hdc2010_collect();
  while (1)
  {
  rt_pin_write(D12_PIN, PIN_LOW);
  rt_thread_mdelay(Speed);
  rt_pin_write(D12_PIN, PIN_HIGH);
  rt_thread_mdelay(Speed);
  }
}

```
#三、编译并下载程序
确认短路帽已经安装好，下载程序到开发板中。
#四、观测HDC2010数据
可以看到，串口控制台打印出HDC2010读取器件ID成功，并配置成功的消息。并随后以0.5秒的频率不断打印温度与湿度信息，温湿度数据较为合理，驱动验证成功！

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626073" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626073&handlekey=savephoto_626073">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

#五、HDC1080温湿度传感器驱动编写
HDC1080是一款TI出品的温湿度传感器，它的软件程序与HDC2010通用程度不高。
HDC1080是我在淘宝购买的一款温湿度传感器,官方手册链接为：http://www.ti.com/cn/lit/gpn/hdc1080。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626081" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626081&handlekey=savephoto_626081">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

HDC1080相对湿度精度为 ±2%（典型值）,温度精度为 ±0.2°C（典型值）,与HDC2010比较类似。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626082" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626082&handlekey=savephoto_626082">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

HDC1080的I2C地址同样为0x40,读取的操作和HDC2010基本相似。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626083" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626083&handlekey=savephoto_626083">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

寄存器地址及说明：

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626084" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626084&handlekey=savephoto_626084">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

HDC2010和HDC1080最大的不同就在这里，多出了一个Conversion Time，即转换时间。

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626085" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626085&handlekey=savephoto_626085">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

一开始我发送了寄存器地址后直接读取数据，却一直读取到0，问题就出在这里，两次I2C操作中间必须加延迟。
在排除这个问题后，HDC1080的驱动编写就容易很多：
```c
#include <rtthread.h>
#include <rtdevice.h>
#include <stdio.h>
#define DBG_TAG "HDC1080"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
#include <hdc1080_collect.h>
static rt_err_t hdc1080_write(struct rt_i2c_bus_device *bus, uint8_t hwadr, uint8_t reg, rt_uint8_t *data)
{
  rt_uint8_t buf[3];
  struct rt_i2c_msg msgs;
  rt_uint32_t buf_size = 1;
  buf[0] = reg; //cmd
  if (data != RT_NULL)
  {
  buf[1] = data[0];
  buf[2] = data[1];
  buf_size = 3;
  }

msgs.addr = hwadr;
  msgs.flags = RT_I2C_WR;
  msgs.buf = buf;
  msgs.len = buf_size;

if (rt_i2c_transfer(bus, &msgs, 1) == 1)
  {
  return RT_EOK;
  }
  else
  {
  return -RT_ERROR;
  }
}
rt_err_t read_regs(struct rt_i2c_bus_device *bus, uint8_t reg, rt_uint8_t *data)
{
  struct rt_i2c_msg msgs[2];
  rt_int8_t res = 0;
  msgs[0].addr = HW_ADR; /* Slave address */
  msgs[0].flags = RT_I2C_WR; /* Write flag */
  msgs[0].buf = ® /* Slave register address */
  msgs[0].len = 1; /* Number of bytes sent */

msgs[1].addr = HW_ADR; /* Slave address */
  msgs[1].flags = RT_I2C_RD; /* Read flag */
  msgs[1].buf = data; /* Read data pointer */
  msgs[1].len = 2; /* Number of bytes read */

if (rt_i2c_transfer((struct rt_i2c_bus_device *) bus, msgs, 2) == 2)
  {
  res = RT_EOK;
  }
  else
  {
  res = -RT_ERROR;
  }
}
static rt_err_t read_regs_A(struct rt_i2c_bus_device *bus, uint8_t reg)
{
  struct rt_i2c_msg msgs;

msgs.addr = HW_ADR;
  msgs.flags = RT_I2C_WR;
  msgs.buf = ®
  msgs.len = 1;

/* 调用I2C设备接口传输数据 */
  if (rt_i2c_transfer(bus, &msgs, 1) == 1)
  {
  return RT_EOK;
  }
  else
  {
  return -RT_ERROR;
  }
}
static rt_err_t read_regs_B(struct rt_i2c_bus_device *bus, rt_uint8_t *data)
{
  struct rt_i2c_msg msgs;

msgs.addr = HW_ADR;
  msgs.flags = RT_I2C_RD;
  msgs.buf = data;
  msgs.len = 2;

/* 调用I2C设备接口传输数据 */
  if (rt_i2c_transfer(bus, &msgs, 1) == 1)
  {
  return RT_EOK;
  }
  else
  {
  return -RT_ERROR;
  }
}
void hdc1080_init(const char *name)
{
  rt_uint8_t CMD[2];
  rt_uint8_t DEVICE_ID[2];
  rt_uint8_t Manufacturer_ID[2];
  CMD[0] = HDC1080_NORMAL | HDC1080_Reserved | HDC1080_HEAT_DISABLE | HDC1080_MODE_MEANWHILE | HDC1080_BTST_ABOVE_2_8V
    | HDC1080_TRES_14BIT | HDC1080_HRES_14BIT;
  CMD[1] = 0x00;
  DEVICE_ID[0] = 0x00;
  DEVICE_ID[1] = 0x00;
  Manufacturer_ID[0] = 0x00;
  Manufacturer_ID[1] = 0x00;
  i2c_bus = (struct rt_i2c_bus_device *) rt_device_find(name);
  if (i2c_bus == RT_NULL)
  {
  LOG_D("can't find%s device!\n", name);
  }
  else
  {

read_regs(i2c_bus, HDC1080_DEVICE_ID, DEVICE_ID);
  if (DEVICE_ID[0] == 0x10 & DEVICE_ID[1] == 0x50)
  {
    LOG_D("hdc1080 read device id success");
    read_regs(i2c_bus, HDC1080_MANUFACTURER_ID, Manufacturer_ID);
    if (Manufacturer_ID[0] == 0x54 & Manufacturer_ID[1] == 0x49)
    {
      LOG_D("hdc1080 read manufacturer id success");
      hdc1080_write(i2c_bus, HW_ADR, HDC1080_Configuration, CMD);
      LOG_D("hdc1080 init success");
    }
    else
    {
      LOG_D("hdc1080 read manufacturer id fail");
    }
  }
  else
  {
    LOG_D("hdc1080 read device id fail");
  }

rt_thread_mdelay(500);
  }
}

void hdc1080_get_data()
{
  read_regs_A(i2c_bus, HDC1080_TempAddress);
  rt_thread_mdelay(15);
  read_regs_B(i2c_bus, temperature_reg);
  temperature_raw = temperature_reg[1] + temperature_reg[0] * 256;
  temperature = (double) temperature_raw / 65536;
  temperature = temperature * 165 - 40;
  read_regs_A(i2c_bus, HDC1080_HumiAddress);
  rt_thread_mdelay(15);
  read_regs_B(i2c_bus, humidity_reg);
  humidity_raw = humidity_reg[1] + humidity_reg[0] * 256;
  humidity = (double) humidity_raw / 65536;
  humidity = humidity * 100;
//  LOG_I("temperature = %d.%d,humidity = %d.%d\n", (int )temperature, (int )(temperature * 10) % 10, (int )humidity,
//    (int )(humidity * 10) % 10);
}
static void hdc2010_collect_thread_entry(void *parameter)
{
  hdc1080_init(HDC1080_I2CBUS);
  while (1)
  {
  hdc1080_get_data();
  rt_thread_mdelay(500);
  }
}

int hdc1080_collect(void)
{
  /* 创建线程*/
  tid1 = rt_thread_create("hdc1080_collect_thread", hdc2010_collect_thread_entry, RT_NULL, THREAD_STACK_SIZE,
  THREAD_PRIORITY, THREAD_TIMESLICE);

/* 如果获得线程控制块，启动这个线程 */
  if (tid1 != RT_NULL)
  rt_thread_startup(tid1);

return 0;
}

```
在main.c中调用：
```c
#include <stdint.h>
#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtthread.h>
#include <rtdevice.h>
#include <stdio.h>
#include <rtdbg.h>
#include <ulog.h>
/* defined the D1pin: PD0
 * defined the D10 pin: PD1
 * defined the D11 pin: PE2
 * defined the D12 pin: PE3
 **/
extern int hdc1080_collect(void);
#define D1_PIN  81
#define D10_PIN 82
#define D11_PIN 1
#define D12_PIN 2
#define K04_PIN 55
int main(void)
{
  uint32_t Speed = 200;
  /* set D12 pin mode to output */
  rt_pin_mode(D12_PIN, PIN_MODE_OUTPUT);
  hdc1080_collect();
  while (1)
  {
  rt_pin_write(D12_PIN, PIN_LOW);
  rt_thread_mdelay(Speed);
  rt_pin_write(D12_PIN, PIN_HIGH);
  rt_thread_mdelay(Speed);
  }
}

```
#六、编译并下载程序
确认未安装短路帽，，并使用杜邦线将HDC1080和开发板连接，连接好后，下载程序到开发板中。
#七、观测HDC2010数据
可以看到，串口控制台打印出HDC1080读取器件ID成功，读取厂商ID成功，并配置成功的消息。并随后以0.5秒的频率不断打印温度与湿度信息，温湿度数据较为合理，驱动验证成功！

<ignore_js_op>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_626093" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=626093&handlekey=savephoto_626093">保存到相册</a>

</p>

</div>
<div class="tip_horn"></div>
</div>

</ignore_js_op>

#下期帖子将会带来基于RT-Thread的SPI使用，敬请期待。
</div><script>					var loginstr = '<div class="locked">查看本帖全部内容，请<a href="javascript:;"   style="color:#e60000" class="loginf">登录</a>或者<a href="https://bbs.eeworld.com.cn/member.php?mod=register_eeworld.php&action=wechat" style="color:#e60000" target="_blank">注册</a></div>';
					
					if(parseInt(discuz_uid)==0){
						
					}		</script><script type="text/javascript">(function(d,c){var a=d.createElement("script"),m=d.getElementsByTagName("script")[0],eewurl="//counter.eeworld.com.cn/pv/count/";a.src=eewurl+c;m.parentNode.insertBefore(a,m)})(document,523)</script>

秦天qintian0303

楼主有实际看IIC驱动源码吗？IIC的过程判断是如何进行的

yang8555u

秦天qintian0303 发表于 2022-7-30 23:54 楼主有实际看IIC驱动源码吗？IIC的过程判断是如何进行的

什么叫过程判断？

秦天qintian0303

yang8555u 发表于 2022-8-1 15:17 什么叫过程判断？

STM32的F1系列是通过标志位判断的，出问题直接卡死

yang8555u

秦天qintian0303 发表于 2022-8-2 09:47 STM32的F1系列是通过标志位判断的，出问题直接卡死

噢。。我这是模拟I2C，GPIO操作的

秦天qintian0303

yang8555u 发表于 2022-8-2 14:54 噢。。我这是模拟I2C，GPIO操作的

可以体验一下硬件的IIC

【国民技术N32WB452测评】第三期、在RT-Thread中使用I2C读取温湿度传感器数据 [复制链接]

最新回复

点评

点评

点评

点评