nRF52832 use device of lis2dh, Failed to read chip id

[psencao]

use the example project of lis2dh on ncs,the pin configuration of the i2c is correct,but it's can't to initialize，as follows:

Is there anything else need to configure

[helsing]

Could you please also post the complete log file?

[psencao]

a_beacon.zipthe version of ncs is v2.2.0。only use the lis2dh application,can't Initial start with no log，add the lis2dh device to beacon application,found the i2c error.

the board is dwm1001 dev,The pin has been configured as follows:

prj.conf:

.dts:

main.c:

the rttlog：

does the project have a log saved during debugging?

i use the nRF5_SDK_16.0.0 to control the lis2dh and it's normal

thank you

[Jared]

Hi,

The schematics shows that you're using P0.28 and P0.29 but the unmodified sample use P0.26 and P0.27. Did you modify the sample to fit your board? Can you share the dts file that you're using, and preferably your build folder as well?

regards

Jared 

[psencao]

the i2c of sample is using p0.28 and p0.29,Is this configuration of i2c not in effect？thank you

decawave_dwm1001_dev.dtsdecawave_dwm1001_dev-pinctrl.dtsi

[Jared]

Hi,

Yes with your custom dtsi and dts it would use P0.28 and P0.29, but using the standard nRF52832 LIS2DH sample I think it should use P0.26 and P0.27,

Either way, can you flash your custom code and try to read out the GPIO_PIN_CNF[n] for P0.28 and P0.29? 

You can use nRF Command Line Tools for this:

Like this:

//For P0.28
nrfjprog --memrd 0x50000770

//For P0.29
nrfjprog --memrd 0x50000774

regards

Jared 

[psencao]

with debug at main,configuration is as follows,the i2c pins are correct

[Jared]

Hi,

Do you have a logic analyzer? 

Could you take a trace of the SDA and SCL line when you try to initialize the device?

I think for some reason either the slave sends a NACK during the initialization routine, or the Master does not send the correct sequence, a trace would show us what is happening,

regards

Jared 

[psencao]

this is the signal of sda and scl at initialization

[psencao]

was the command executed incorrectly during initialization?

thankyou

[Jared]

Hi,

That is strange, it doesn't look like I2C signals, the pins should initially be high and then SDA should go low before the SCLK line. Are you sure that you're measuring on the correct pins? Maybe the device that is connected is driving the pins somehow. Can you try to disconnect anything that is connected to the clock and data line and measure on them again?

regards

Jared