I need to work on twi compatible with smbus and I2C for NRF5340 DK

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

ali vali — Sun, 21 Nov 2021 11:10:34 GMT

i cant view your image! i need to program this ic: icgram.com/.../

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Thu, 24 Jun 2021 11:52:24 GMT

Nice, I'm happy you finally got it to work!

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Thu, 24 Jun 2021 11:38:16 GMT

Hey Simon,

Thank you for your support, I got the temperature from MLX90614

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Tue, 22 Jun 2021 15:36:28 GMT

Hey simon,

Actually, !00khz frequency was fine for me, KIndly check the below image

other than Arduino, to interface mlx sensor. I need to write with the repeated start method

Kindly, give some suggestions or samples related to this.

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Tue, 22 Jun 2021 14:27:07 GMT

Can you show me your overlay file?

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Thu, 17 Jun 2021 12:58:06 GMT

Hey Simon

I have done this already. It shows "you didn't set the referenced frequency at dts". like this error has comming

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Thu, 17 Jun 2021 09:53:13 GMT

Use the clock-frequency field:

https://github.com/nrfconnect/sdk-nrf/blob/v1.5.1/boards/arm/thingy91_nrf9160/thingy91_nrf9160_common.dts#L112

Best regards,

Simon

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Thu, 17 Jun 2021 04:44:17 GMT

Hey Simon,

Even, I can't able to write address and get ack. I think It was the issue in communication frequency. Already, I have checked with 100Khz and 400Khz. Now, I need to check with 2Mhz. Kindly, explain to me how to set the i2C clock frequency at 2Mhz.

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Tue, 15 Jun 2021 06:52:51 GMT

[quote userid="72692" url="~/f/nordic-q-a/75778/i-need-to-work-on-twi-compatible-with-smbus-and-i2c-for-nrf5340-dk/315074#315074"]

Try to swap i2c_read() with i2c_transfer() and see if it works then.

[/quote]

Hey Simon, I have tried I2c_transfer. Even, I can't able to contact with my senor

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Mon, 14 Jun 2021 10:07:28 GMT

I took a look a look at your code, and I think I spotted the problem. In order to read a particular address, you need to first write the register address to the device, then you perform a read which will give you the value stored at the register address. What you are doing now, is just to run the i2c read command, and the MLX90614 has no idea what register value to return, since you haven't written it to the sensor.

I don't have an MLX90614 at the moment, but I tested with a MAX44009 GY-49, and was able to read a register using the i2c_transfer() command instead. Check out the code here:

https://github.com/simon-iversen/sdk-nrf/blob/e20d09457010acc5c6aec4bacc6e756b4c470856/samples/read_reg_max44009/src/main.c#L63

https://github.com/simon-iversen/sdk-nrf/blob/e20d09457010acc5c6aec4bacc6e756b4c470856/samples/read_reg_max44009/src/main.c#L16-L40

Try to swap i2c_read() with i2c_transfer() and see if it works then.

Best regards,

Simon

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Fri, 11 Jun 2021 12:12:38 GMT

Hey :) I have been quite busy lately, but I will take a look at it today/Monday

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Fri, 11 Jun 2021 10:20:04 GMT

hey, Simon

did you check my application?

What are the mistakes I have done?

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Wed, 09 Jun 2021 21:28:12 GMT

Thanks. I'll take a look at it.

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Tue, 08 Jun 2021 14:25:47 GMT

Yaa sure,

This is my application file

devzone.nordicsemi.com/.../MLX2.rar

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Tue, 08 Jun 2021 14:13:06 GMT

Can you zip your application and upload it? Then I'll take a look at it.

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Tue, 08 Jun 2021 13:51:30 GMT

Hey Simon,

I have successfully interfaced the Sht25 with my DK. But I can't able communicate with MLX90614.

Regards, I have tried the logging I have got this

My logic analyzer output looks like this

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Tue, 08 Jun 2021 12:29:52 GMT

[quote user="Mr.NCK"]I can't able to read the address of the Sht20 and mlx96401 sensor by using twi scanner. what can I do next ?[/quote]

Can you upload an image of the logic analyzer trace when you do this, then I can take a look at it.

Could you also attach the code you're using?

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Fri, 04 Jun 2021 12:24:57 GMT

Hi again

I can't able to read the address of the Sht20 and mlx96401 sensor by using twi scanner. what can I do next ?

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Thu, 03 Jun 2021 12:09:36 GMT

Hi Simon,

Thank you, Now I can read address

I have attached the Output image for your reference. I can read the address of the MPU6050 sensor. But I can't able to read the address of the SHT20 and MLX96401.

Regards, I have tested with the Logic analyzer. I have got a read timeout error.

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Wed, 02 Jun 2021 19:02:12 GMT

I made some modifications to the i2c_scanner sample:

Changed the name nrf5340pdk_nrf5340_cpuappns.overlay to nrf5340dk_nrf5340_cpuapp.overlay
Removed unecessary Kconfigs from the prj.conf
Swapped NRF_TWIM1_NS with NRF_TWIM1_S

Could you test the updated sample with NCS v1.5.1 and the board nrf5340dk_nrf5340_cpuapp?

i2c_scanner.zip

Connect the sensor in the following manner:

Sensor	nRF5340 DK
SDA	P1.02 (34-32=2)
SCL	P0.04 (4)
VIN	VDD
GND	GND

I tested the sample with a MAX4009 GY-49 and it worked fine. I got the following output:

*** Booting Zephyr OS build v2.4.99-ncs2  ***                                                                                                                               v2.4.99-ncs2  ***
The I2C scanner started
Value of NRF_TWIM1_S->PSEL.SCL : 4
Value of NRF_TWIM1_S->PSEL.SDA : 34
Value of NRF_TWIM1_S->FREQUENCY: 26738688
26738688 -> 100k
0x4b FOUND

Best regards,

Simon

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Tue, 01 Jun 2021 15:07:16 GMT

Simon,

Thank you for your response.

[quote userid="72692" url="~/f/nordic-q-a/75778/i-need-to-work-on-twi-compatible-with-smbus-and-i2c-for-nrf5340-dk/312850#312850"]I would recommend you to start with the i2c_scanner example,[/quote]

I have tried i2c_scanner_example.

I can't able to read the device address. I have attached my output terminal below

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Tue, 01 Jun 2021 11:27:33 GMT

[quote user="Mr.NCK"]

I have tried to interface the sht20 sensor with nrf5340. My sensor output values are always constant. even I didn't connect my sensor it throws the same values.

do you have any reference to interface external sensors other than given samples?

[/quote]

It seems like you are creating the driver yourself. I would recommend you to start with the i2c_scanner example, and just see if you can communicate with the sensor. Then you can gradually, step-by-step, build on the example. Write to a register, read a register, read sensor values. Study the datasheet of the SHT20 closely.

Do you have a logic analyzer? That's a very useful tool that allows you to see what's actually being sent.

Best regards,

Simon

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK — Mon, 31 May 2021 12:15:39 GMT

Hi Simon,

Thank you very much, I have seen your ncs tutorial series that is very helpful. to get started to create an application nrf5340. I have understood part 1 and part 2. I have got stuck at Part 3. It was a little difficult. give some implementation examples.

I have tried to interface the sht20 sensor with nrf5340. My sensor output values are always constant. even I didn't connect my sensor it throws the same values.

do you have any reference to interface external sensors other than given samples?

[quote userid="72692" url="~/f/nordic-q-a/75778/i-need-to-work-on-twi-compatible-with-smbus-and-i2c-for-nrf5340-dk/312615#312615"]It seems like the sensor should be compatible with I2C as long as you set the speed to 100kHz. Use the clock-frequency field in an i2c instance to configure the speed (see thingy91_nrf9160_common.dts and dt-bindings/i2c/i2c.h).[/quote]

I have tried the above. The same issue followed which I mentioned above.

Thanks & Regards

Navin

RE: I need to work on twi compatible with smbus and I2C for NRF5340 DK

Simon — Mon, 31 May 2021 11:17:45 GMT

Check out this DevZone case: https://devzone.nordicsemi.com/f/nordic-q-a/63687/nrf52811-i2c-compatibilty

It seems like the sensor should be compatible with I2C as long as you set the speed to 100kHz. Use the clock-frequency field in an i2c instance to configure the speed (see thingy91_nrf9160_common.dts and dt-bindings/i2c/i2c.h).

Best regards,

Simon