问题描述
我在ST Temperature sensor( hts221 )上工作，我与传感器使用I2C命令通信.
I am working on ST Temperature sensor( hts221 ) , I use I2C command communication with sensor.
我从文档中看到如下文本.
I see from the document like the following text.
enter code here Temperature data are expressed as TEMP_OUT_H & TEMP_OUT_L as 2’s complement numbers.
enter code here Temperature data are expressed as TEMP_OUT_H & TEMP_OUT_L as 2’s complement numbers.
下面的图片是来自文档的描述.
And the following picture is the description from document.
从传感器读取的Temperature data如下所示
And the Temperature data read from the sensor is like the following
TEMP_OUT_L is 0xA8
TEMP_OUT_H is 0xFF
如何将TEMP_OUT_L和TEMP_OUT_H的值转换为温度数据?
提前谢谢吗?
推荐答案
在数据表说:
Temperature sensitivity 0.016 °C/LSB
这就是您需要做的:
#define TEMP_SENSITIVITY 0.016f
#define TEMP_OFFSET ??? /* Get this value from the datasheet. */
unsigned char tempOutH;
unsigned char tempOutL;
/* Here you get the values for tempOutH and tempOutL. */
uint16_t tempData = (tempOutH << 8) | tempOutL;
float temp = (tempData * TEMP_SENSITIVITY) + TEMP_OFFSET;
因此，您要做的是将两个8位的高值和低值连接在一起.这为您提供了一个16位值.然后，您可以将0到65535之间的数字转换/缩放为实际温度值.
So what you do is concatenate the two 8-bit high and low values. This gives you a single 16-bit value. Then you convert/scale that number between 0 and 65535 to the real temperature value.
我假设必须在数据表中指定一个偏移量，因为否则温度只能为正值:在0.0和65363 * 0.016之间.该偏移量将为负值.我让你找这个偏移量.
I assumed that there must be an offset specified in the datasheet, because otherwise the temperature can only positive: between 0.0 and 65363 * 0.016. This offset will be a negative value. I leave it up to you to find this offset.
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