nRF51822 with LIS3DH using SPI

RE: nRF51822 with LIS3DH using SPI

walterLIte — Sun, 09 Aug 2020 18:36:32 GMT

no ..still no results

RE: nRF51822 with LIS3DH using SPI

Christoph_I — Tue, 24 Dec 2019 11:08:24 GMT

Hey walterLlte, Jules, Davies Chung and Mango. Do you have the results of Davis Chung? It would be really nice to have the results.

RE: nRF51822 with LIS3DH using SPI

walterLIte — Mon, 21 Aug 2017 20:18:00 GMT

anyone get this to work ??

RE: nRF51822 with LIS3DH using SPI

Jules — Sun, 15 May 2016 09:59:38 GMT

Hi ! Could you share your results ? I am trying to use the LIS3DH in vain too, I see that some people managed to do it on this forum, but nobody posted how they did :/ I hope I'm not too late !

RE: nRF51822 with LIS3DH using SPI

Davis Chung — Mon, 27 Jul 2015 16:27:14 GMT

Thanks Mango in responding to my question so prompt. I really appreciate it! After your reminder about the CS pin and also reading of the WHO_AM_I register, I tried a few settings and finally everything goes smooth. Now I could config the LIS3DH to generate nice interrupt signal when it detects any motion. Thanks you very much!!

RE: nRF51822 with LIS3DH using SPI

MANGO — Mon, 27 Jul 2015 04:07:28 GMT

I'm not 100% sure whether it is okay to hold the CS pin to GND.

The best way to check is using the oscilloscope, in my opinion.

Because you can tell whether your code is wrong or your hardware has problems.

Hook up the MISO and MOSI if they show the result you expected.

If it does not, it won't be good to hold the CS pin to GND.

As you see at the datasheet, Figure 10 shows that you need to tie the CS to GND to write multiple bytes.

However, your code may not create the clock signal continuously like Figure 10.

Also, if you see Figure 3, CS's hold time and Output disable time are stated.

You have to make the signals like Figure 3 and I think holding the CS to GND will screw this.

In this sense, I do not recommend you to tie the CS pin.

I hope for you to work out well.

RE: nRF51822 with LIS3DH using SPI

Davis Chung — Mon, 27 Jul 2015 01:18:47 GMT

Thanks for answering. I have physically connected the CS pin to GND, so Im wondering it should be fine, shouldn't?? And I should definitely try to read the 0Fh register. Indeed Im not sure whether my code is correct or not. I hope it would be a soldering problem. I will check about it!

RE: nRF51822 with LIS3DH using SPI

MANGO — Sun, 26 Jul 2015 18:18:26 GMT

Hi, I once tried those ST's accelerometer with other vendor's MCU.

However I didn't tried the SPI example so I can't tell much about the code.

The pin connection

(MISO nRF51822 SPI RX - pin 7 SDO and MOSI nRF51822 SPI TX - pin 6 SDA) is correct.

As far as I know, if you use the NRF51822 as a master, you might need to control the CS pin to low manually.

(Since I haven't tried SPI, I state my answer with caution.)

But you did not make a connection with the CS pin, did you?

Assuming the code is correct, I really hope it is just a soldering problem.

Also I will just assume that you have soldered the accelerometer to a board like this.

I don't know what this is called in English.

So, can you check two things?

If you have an oscilloscope, can you check your CS pin drops to 0 Volts when you read?

If it does not become low, the accelerometer is using I2C.

What is the result when you read the WHO_AM_I (0Fh) register?

The result should be 0x33.

If you do not receive this, the soldering may not be done perfectly to that red board up there.

Finally, try your code once more after adding codes about lowering the CS.

Or ask the Nordic developers whether the SDK can control the CS pin you are about to use.

I hope you could search some examples that lowers the CS pins.

Also, check once more about theSPI_MODE0 ,1 ,2 ,or 3 you should use.

-Regards, Mango922