CCS/CC2640R2F: Project Zero: Passing a voltage value into a service.

Salvador Garza

Part Number: CC2640R2F

Tool/software: Code Composer Studio

Hello,

I generated a service (using bluetooth developer studio) called Voltage_Service that is meant for transmitting the voltage value as a characteristic value. The voltage was gathered by using the process in ADC single channel driver example. I attempted to pass the value of ADC0MicroVolt into the parameter using the set_parameter function (the characteristic of which had a length of 4 and the state was uint32_t.

The voltage_service shows when I connect to it via my IOS device, but whenever I try reading the value the peripheral disconnects.

Not only that, when I try accessing the other services they do not behave the way that they are supposed to.

So I guess my question is, what is the proper way to read an analog voltage and then send it over the wave through a service?

over 6 years ago

0 Sy Su over 6 years ago

TI__Expert 5390 points

Hi Salvador,

When trying to read the characteristic, can you set a breakpoint in the service's readAttrCB and let me know if it reaches there before a disconnection occurs? There should be useful debugging information to be found here.
Within this callback, do you have a case statement that checks for the UUID of the voltage characteristic?

-Sy Su

0 Salvador Garza over 6 years ago in reply to Sy Su

Intellectual 500 points

There is a case. Where do you think I should put the breakpoint?

0 Salvador Garza over 6 years ago in reply to Sy Su

Intellectual 500 points

It hits the breakpoint at paramID = VOLTAGE_SERVICE_findCharParamID( pAttr );

0 Sy Su over 6 years ago in reply to Salvador Garza

TI__Expert 5390 points

Hi Salvador,

Is paramID returning as the expected UUID for the correct voltage value characteristic? Does it enter the case statement and does the callback return successfully?

-Sy Su

0 Salvador Garza over 6 years ago in reply to Sy Su

Intellectual 500 points

Is there a debugging guide to help me with this? Not quite sure how to view the return variable. I think I will have to put the breakpoint immediately after return status, but not to sure how to view the results.

0 Salvador Garza over 6 years ago in reply to Sy Su

Intellectual 500 points

No in expressions paramID is listed as unknown.

0 Sy Su over 6 years ago in reply to Salvador Garza

TI__Expert 5390 points

Hi Salvador,

It seems like these variables are being optimized out.
Use the following guide to turn off optimizations. You'll only what to do this for debugging purposes.
software-dl.ti.com/.../optimizations.html

-Sy Su

0 Sy Su over 6 years ago in reply to Sy Su

TI__Expert 5390 points

Hey Salvador,

Did turning off optimizations help you view the paramID variable?

-Sy Su

0 Salvador Garza over 6 years ago in reply to Sy Su

Intellectual 500 points

No it turns out I was improperly using the hardware interrupts so the task got stuck. Thank you for the help and the analog transmitter is working fine if you would like me to post the function anywhere.

0 Sy Su over 6 years ago in reply to Salvador Garza

TI__Expert 5390 points

Ah. I see. I'm glad to hear you have it working now.

It's up to you if you want to share it.
There's always a chance your code could help someone in the community in the future.

-Sy Su

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CCS/CC2640R2F: Project Zero: Passing a voltage value into a service.