How to get die temperature on NRF52832 using Zephyr

RE: How to get die temperature on NRF52832 using Zephyr

zciwor — Mon, 19 Jul 2021 21:20:03 GMT

I ended up finding this example which solved the problem for me: github.com/.../hts.c

RE: How to get die temperature on NRF52832 using Zephyr

zciwor — Mon, 19 Jul 2021 20:54:47 GMT

Hey David, did you find a solution here? I'm running into the same issue.

RE: How to get die temperature on NRF52832 using Zephyr

David — Thu, 01 Apr 2021 13:27:51 GMT

Yes, the header file is included. I'll see if I can get some help on Slack

Thanks for your help

RE: How to get die temperature on NRF52832 using Zephyr

Christian Holland — Thu, 01 Apr 2021 13:19:53 GMT

Are you sure to include the sensor header file too?

#include <drivers/sensor.h>

If not I'm not sure what else, there's nothing else relevant in my prj.conf. Are you in the Zephyr Slack channel? They're normally quite helpful there.

RE: How to get die temperature on NRF52832 using Zephyr

David — Thu, 01 Apr 2021 13:17:28 GMT

Thank you for the hint. Unfortunately, CONFIG_TEMP_NRF5_NAME is still undefined.

However, CONFIG_HAS_HW_NRF_TEMP is set to 1, which means the hardware exists, but I can't figure out its name.

RE: How to get die temperature on NRF52832 using Zephyr

Christian Holland — Thu, 01 Apr 2021 12:52:26 GMT

We've only been testing and using NRF52832 so i guess the binding could be different for the 528340 (although i wouldn't imagine so).

Try adding this to you prj.conf

CONFIG_TEMP_NRF5=y

RE: How to get die temperature on NRF52832 using Zephyr

David — Thu, 01 Apr 2021 12:49:15 GMT

According to Zephyr documentation, the default value for CONFIG_TEMP_NRF5_NAME should be "TEMP_0", but that doesn't work for me. Could you check how it's expanded in your example?

Which chip / board do you use? I have an nRF52840-DK

What are the contents of your prj.conf file? Do I have to enable something more than CONFIG_SENSOR=y

RE: How to get die temperature on NRF52832 using Zephyr

Christian Holland — Thu, 01 Apr 2021 12:30:06 GMT

I assign temp_dev by using the CONFIG_TEMP_NRF5_NAME macro:

temp_dev = device_get_binding(CONFIG_TEMP_NRF5_NAME);

RE: How to get die temperature on NRF52832 using Zephyr

David — Thu, 01 Apr 2021 12:28:08 GMT

Hi Christian,

Thank you for the fast reply. Could you please tell me how to populate struct device* in your function call?

I found another example (installed with nRF Connect SDK in \ncs\v1.5.0\zephyr\samples\sensor\thermometer) that is quite similar to your code. Unfortunately, the following initialisation returns an error

temp_dev = device_get_binding("TEMP_0");

Best regards

David

RE: How to get die temperature on NRF52832 using Zephyr

Christian Holland — Thu, 01 Apr 2021 10:13:13 GMT

Hi mate, I struggled with this one so I'll help you out - this is how I did it in the end:

static int read_temperature(struct device *temp_dev,

struct sensor_value *float_val) {

const char *name = temp_dev->name;

struct sensor_value temp_val;

int ret;

ret = sensor_sample_fetch(temp_dev);

if (ret) {

printk("%s: I/O error: %d", name, ret);

return ret;

}

ret = sensor_channel_get(temp_dev, SENSOR_CHAN_DIE_TEMP, &temp_val);

if (ret) {

printk("%s: can't get data: %d", name, ret);

return ret;

}

//printk("%s: read %d.%d C\n", name, temp_val.val1, temp_val.val2);

float_val->val1 = temp_val.val1;

float_val->val2 = temp_val.val2;

generic_data[3] = temp_val.val1;

return 0;

}

RE: How to get die temperature on NRF52832 using Zephyr

David — Thu, 01 Apr 2021 09:47:19 GMT

Are there any news on this topic? I would be interested in the answer to the original question

Thanks

RE: How to get die temperature on NRF52832 using Zephyr

Simonr — Mon, 06 Jan 2020 08:18:46 GMT

Nordic contributes device support to the Zephyr open source project and can recommend it as a solution, though we do not offer technical support for Zephyr RTOS on nRF52 today. I am sorry, but we don't offer technical support for the Zephyr RTOS on nRF52 as of yet.

Best regards,

Simon