Color sensor pca20035

[Hoang]

Dear, 

I am using thingy:91 pca20035 and try to test the color sensor BH1749NUC

I tried to run the /samples/sensor/bh1749

I got the output: 

SPM: NS image at 0xc000
SPM: NS MSP at 0x20020a78
SPM: NS reset vector at 0xde51
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-1270-gb1d603491de8 *****
device is 0x20021d9c, name is BH1749
[00:00:00.004,913] [1B][0m<inf> BH1749: BH1749 initialized[1B][0m

I expected it will return the color in process(dev); but I got nothing. 

Do I need to do some "trigger" to enable sensor? 

Thanks, 

BR, 

Hoang Nguyen

[Simon]

The reason you're not getting any input is because it's stuck at process(..)→while(1)→k_sem_take(..). In order for the program to continue from there, k_sem_give(..) has to be called (this is because the count it zero, and the give function will increase it, read more about semaphores here). In trigger_handler(..) this function is called, and it will allow the program to continue.

When I ran the program, the trigger function was never called, I am not sure why, since sensor_trigger_set() executed without any errors. It might be something wrong with the configuration of the bh1479 sensor, and it will never trigger GPIO PIN 27.

However, I was able to make the sensor work by disabling triggering, which can be done by setting CONFIG_BH1749_TRIGGER=n in prj.conf. Then you have to call sensor_sample_fetch_chan(..) followed by sensor_channel_get(..) at regular intervals.

If you would like to use the sensor in interrupt mode, I can look into it.

Best regards,

Simon

[Hoang]

Hello @Simon 

Are you there?

[Hoang]

hi @Simon, 

I changed the prj.conf as your:

(added) 

CONFIG_HAS_SEGGER_RTT=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=n

and ran again: 

nothing come ( run NS)

Peripheral		Domain		Status
00 NRF_P0		Non-Secure	OK
01 NRF_CLOCK		Non-Secure	OK
02 NRF_RTC1		Non-Secure	OK
03 NRF_NVMC		Non-Secure	OK
04 NRF_UARTE1		Non-Secure	OK
05 NRF_TWIM2		Non-Secure	OK
06 NRF_SPIM3		Non-Secure	OK
07 NRF_TIMER0		Non-Secure	OK
08 NRF_TIMER1		Non-Secure	OK
09 NRF_TIMER2		Non-Secure	OK
10 NRF_SAADC		Non-Secure	OK
11 NRF_PWM0		Non-Secure	OK
12 NRF_PWM1		Non-Secure	OK
13 NRF_PWM2		Non-Secure	OK
14 NRF_PWM3		Non-Secure	OK
15 NRF_IPC		Non-Secure	OK
16 NRF_VMC		Non-Secure	OK
17 NRF_FPU		Non-Secure	OK
18 NRF_EGU1		Non-Secure	OK
19 NRF_EGU2		Non-Secure	OK
20 NRF_GPIOTE1		Non-Secure	OK

SPM: NS image at 0xc000
SPM: NS MSP at 0x20020f38
SPM: NS reset vector at 0xdff1
SPM: prepare to jump to Non-Secure image.

Could you please share your code, is it possible?

Thanks, 

BR, 

Hoang Nguyen

[Simon]

I am not at the office at the moment, and not able to share the sample, but I will do it on monday.

I saw in your last post that sensor_sample_fetch() returned -5 (= -EIO), could you debug your sample using this approach, and try to figure out where exactly this error happens. Put breakpoints in the function bh1749_sample_fetch(..) at each "return -EIO" and see where it stops.

Best regards,

Simon

[Hoang]

hi Simon 

Have you backed? Im still waiting for you

[Simon]

Hello, I am sorry, I forgot to share the code with you yesterday. Currently I am sick, and not at the office. I don't have the Thingy91 at hand either. I will share it as soon as I am back in office.

But I am pretty sure I have described all the changes I have done to samples\sensor\bh1749 in this ticket.

You should investigate the EIO error, then you will find out what is causing your problems.

Try running it in debug mode as well, I wonder if that is what I did. Also, check if bh1749_init() runs successfully.

Best regards,

Simon

[Hoang]

Hi Hi Simon 

Have you backed to work today? How are you? I hope you are better now

[Simon]

I am feeling better now, and I'm back in office. I will provide you the sample today.

Best regards,

Simon

[Hoang]

Thanks

[Hoang]

hi Simon, 

I tried to combine bh1749 source code to asset_tracker, and it works

But, I didnt work when it stood alone

Thanks, 

BR, 

Hoang Nguyen

[Simon]

Strange.. Do you need to make it work alone, or should we consider this case resolved?

Best regards,

Simon

[Hoang]

With me, I want to make it clean, I want to know why it couldn't work when it stands alone. 

then, i can understand more clearly about sensor api. but no rush, if you are so busy. 

Thanks, 

BR, 

Hoang Nguyen