自己添加了package，使用SHT20遇到的问题

发布于 2019-10-25 16:32:49 浏览：1592 订阅该版

通过env配置，打开了I2C配置，然后packge也选中了SHT2X，并下载更新
前面都很正常，运行package中自带的finsh接口能读取数据如下：
msh >sht20 probe i2c1
msh >sht20 probe i2c2
[E/sht20] Can't find sht20 device on 'i2c2' 
msh >sht20 read
Please using 'sht20 probe <dev_name>' first
msh >sht20 probe i2c1
msh >sht20 read
read sht20 sensor humidity   : 45.5 %
read sht20 sensor temperature: 25.1 
msh >sht20 read
read sht20 sensor humidity   : 50.1 %
read sht20 sensor temperature: 24.7

第二步，我开始新建了一个叫watchdog的线程【线程名称没关系不用在意，实际上里面就是周期性读取并显示温度值】
在线程里编写了以下代码：
void watchdog_thread_entry()
{
	static sht20_device_t dev_sht20 = RT_NULL;
	while(1)
	{
		rt_thread_mdelay(2000);
		dev_sht20=sht20_init("i2c1");
		temp_sht20=sht20_read_temperature(dev_sht20);
		rt_kprintf("read sht20 sensor temperature: %d.%d <br>", (int)temp_sht20, (int)(temp_sht20 * 10) % 10);
	}
}

然后运行，发现有3个问题：
1、读到的温度都是0
read sht20 sensor temperature: 0.0 
2、过不了多少时间就会报错
msh >read sht20 sensor temperature: 0.0 
[E/sht20] Can't start filtering function for sht20 device on 'i2c1' 
(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex) assertion failed at function:rt_mutex_take, line number:6

3、查看线程状态如下：
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
sht20     15  suspend 0x00000100 0x00000400    25%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  ready   0x00000070 0x00000400    35%   0x0000000a -02
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x00000009 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000009 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  ready   0x00000070 0x00000400    35%   0x0000000a -02
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x00000009 000
sht20     15  ready   0x00000074 0x00000400    35%   0x00000008 -02
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000009 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x0000000a 000
sht20     15  ready   0x00000070 0x00000400    35%   0x0000000a -02
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000007 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x0000000a 000
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000008 000
sht20     15  ready   0x00000070 0x00000400    35%   0x00000007 -02
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000008 000
sht20     15  suspend 0x00000100 0x00000400    35%   0x00000006 000
sht20     15  ready   0x00000074 0x00000400    35%   0x00000008 -02
sht20     15  ready   0x00000168 0x00000400    35%   0x00000008 -02
sht20     15  suspend 0x00000104 0x00000400    35%   0x00000007 000
led        5  suspend 0x00000078 0x00000100    46%   0x00000014 000
watchdog  10  ready   0x000000a0 0x00000400    26%   0x0000000b 000
tshell     2  ready   0x00000080 0x00001000    08%   0x00000003 000
tidle     31  ready   0x00000050 0x00000100    31%   0x0000000b 000
main      10  suspend 0x00000090 0x00000800    11%   0x00000012 000

最后，我尝试把该线程的内存改大，时间片改大，现象都是一样的

6 个回答

tyustli 2019-10-25

这家伙很懒，什么也没写！

sjj430 2019-10-25

这家伙很懒，什么也没写！

sjj430 2019-10-25

这家伙很懒，什么也没写！

sjj430 2019-10-25

这家伙很懒，什么也没写！

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
led        5  suspend 0x00000078 0x00000100    46%   0x00000014 000
watchdog  10  suspend 0x00000078 0x00000400    35%   0x0000001a 000
tshell     2  ready   0x00000080 0x00001000    07%   0x0000000a 000
tidle     31  ready   0x00000050 0x00000100    31%   0x00000004 000
main      10  suspend 0x00000090 0x00000800    11%   0x00000012 000
msh >read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 24.9 
read sht20 sensor temperature: 24.9 
read sht20 sensor temperature: 24.9 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 24.9 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0 
read sht20 sensor temperature: 25.0