The "twi_sensor" example is not working properly

[lisi]

SDK ： nRF5_SDK_15.0.0_a53641a

example： nRF5_SDK_15.0.0_a53641a\examples\peripheral\twi_sensor

I didn't change anything. After build and download to the Nordic development board,

The  LM75B_set_mode()  function in the main function is blocked and not executed normally. The blocking expression is while (m_xfer_done == false);

After I used the SDK： nRF5_SDK_15.2.0_9412b96 , also appeared the above situation

pics:

 

Please help to answer it, thanks.

[Jørgen Holmefjord]

Hi,

Did you connect a LM75B sensor to the TWI pins defined in the example, before running it?

If there is no sensor connected, the example will detect an error on the TWI bus and not set the m_xfer_done flag.

Best regards,
Jørgen

[lisi]

Hi，

I used the Nordic board for pca1004， does this board have no  an LM75B sensor？

Please help to answer it, thanks

[Jørgen Holmefjord]

No, there is no sensor on the board. You need to connect it externally. This is written in the example documentation:

"This example assumes that an mbed application shield is used and that the SDA and the SCL lines are connected to Arduino define pins."

[lisi]

I was wrong，before this，I thought there was a temperature sensor on the pca10040 board .

But, when I was debugging other sensors, the analog I2C communication could be used.But the hardware I2C communicate could not be used , and also stopped on the expression (m_xfer_done == false)

[Jørgen Holmefjord]

There is a die temperature sensor inside the chip itself, but this does not use the TWI peripheral.