Regarding twi sensor

RE: Regarding twi sensor

Manoj Hiwarkar — Wed, 04 Apr 2018 07:39:01 GMT

I am getting the clock pulses on SCL & SDA pins of the target board. But still I am not getting the data from the max30205. I am herewith uploading the two videos (both are with different time base) these clock pulses on the oscilloscope.

Blue line is SDA

Yellow line is SCL

So please tell me where I am going wrong.devzone.nordicsemi.com/.../video_5F00_20180404_5F00_123232.mp4 devzone.nordicsemi.com/.../video_5F00_20180404_5F00_123319.mp4

RE: Regarding twi sensor

Manoj Hiwarkar — Wed, 28 Mar 2018 04:54:30 GMT

The twi sensor code is working now. The problem was in pack installation. But now the thing is I am not able to configure the pins P0.09 & P0.10 as SCL & SDA. Other pins are getting configured.

RE: Regarding twi sensor

MartinBL — Tue, 27 Mar 2018 09:27:07 GMT

I tested your code and it worked out of the box. I used

An MPU9255 as slave (shouldn't matter though as long as you have functional slave device?)
PCA10040 development kit
SDK 14.2.0
And these pins:

#define ARDUINO_SCL_PIN             27    // SCL signal pin
#define ARDUINO_SDA_PIN             26    // SDA signal pin

I have attached my .hex file. Can you try to program it to your kit and see if it works? If it doesn't, then your kit, or possibly any attached slave devices, seems to be broken. I have seen other cases where things work on my system, but not on the customer's, and in one particular case it turned out that the customer had changed his driver files and forgotten about it. Hence, it worked when I compiled the code with my original SDK files, but not when he compiled it with his modified files. So make sure to use original drivers.

RE: Regarding twi sensor

Manoj Hiwarkar — Tue, 27 Mar 2018 04:43:49 GMT

devzone.nordicsemi.com/.../twi_5F00_scanner.rar

Here is the twi scanner file. please check

RE: Regarding twi sensor

Manoj Hiwarkar — Mon, 26 Mar 2018 15:35:09 GMT

1.Yes I have tried with P0.24 & P0.25.

2. We have our target board , but we don't have another kit.

RE: Regarding twi sensor

MartinBL — Mon, 26 Mar 2018 15:27:41 GMT

You can just upload it here. In the comment "input field" click Insert -> Insert Image/Video/File and choose 'File Upload'.

DId you try different pins? And by the way, do you have another kit you can try?

RE: Regarding twi sensor

Manoj Hiwarkar — Mon, 26 Mar 2018 14:51:43 GMT

Ok how shall i send the project file to you?

RE: Regarding twi sensor

MartinBL — Mon, 26 Mar 2018 14:37:07 GMT

That is strange.

Have you tried to route the TWI to other pins on the DK? Pin 3 and 4 for example? They are my go-to TWI pins as they are not connected to any buttons or LEDs etc. on the kit.

Can you compile a fresh twi_scanner example with default pins etc., so that I can test the same code on my own development kit?

RE: Regarding twi sensor

Manoj Hiwarkar — Mon, 26 Mar 2018 12:07:11 GMT

yes

RE: Regarding twi sensor

MartinBL — Mon, 26 Mar 2018 12:05:40 GMT

Are you able to toggle the pins with minimal code (without using TWI)?

RE: Regarding twi sensor

Manoj Hiwarkar — Mon, 26 Mar 2018 09:57:45 GMT

No, I have not modified anything, the scl & sda pins are defined exactly as shown above. And I have also not connected anything other than DSO pins.

RE: Regarding twi sensor

MartinBL — Mon, 26 Mar 2018 09:44:27 GMT

Hi,

As long as you haven't modified anything, the scanner example and the PCA10040 should work out of the box. Have you double checked that you are using the correct pins? The default pins are configured in pca10040.h as:

#define ARDUINO_SCL_PIN             27    // SCL signal pin
#define ARDUINO_SDA_PIN             26    // SDA signal pin

which should be correct in your case.

Have you connecte anything else than your scope to the pins?