CCS/TMS570LC4357: ADC module stuck in Conversion Loop

Hamzah Ayaz

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

I wanted to connect some analog sensors to the TMS570LC4357 HDK board and get a reading from them, so following the guides available online, in halcogen i set up pins 0 and 1 in ADC1, Group 1. I used software trigger and set the FIFO size to 2. The rest i left as it is as shown in tutorials. When testing the code that is in the examples, i get stuck in the while loop for the function: adcIsConversionComplete(). The function continuously returns zero (which according to my research means not complete). Alos if i press reset, the terminal randomly displays 2 or 4 converted reading and then again gets stuck in the loop. Can anyone help me out or tell me what is going on?

here is a pic of my halcogen configuration (ADC1 is enabled in driver tab):

and here is the section of the code handling ADC (the readSensors() function in called inside a while loop in the main() function):

over 7 years ago

0 Miro over 7 years ago

TI__Mastermind 21425 points

Hello,

Attached are HALCoGen and CCS projects that reads HDKs Temperature and Light onboard sensors.

2555.ADC_4357.ZIP

0 Hamzah Ayaz over 7 years ago in reply to Miro

Prodigy 60 points

Hello Miro, Thanks for the reply

I tested out the ADC code that you shared, unfortunately i am still having the same problem. The code gets stuck in the adcIsConversionComplete() function as the conversion complete flag register always stays zero. On resting the board i did get reading but only once after that code again got stuck in a loop. Here is a screen shot during the dubugging:

The screen shot is after 3 mins of running the code

0 Miro over 7 years ago in reply to Hamzah Ayaz

TI__Mastermind 21425 points

Hello,

Did you make changes to my project?

Can you share your project with attaching it here?

0 Hamzah Ayaz over 7 years ago in reply to Miro

Prodigy 60 points

Hi,

No i did not make any changes to the project you shared and ran it directly on the HDK and sure i will be happy to share it. Here is the link: 3823.ADC_Test.rar

0 Miro over 7 years ago in reply to Hamzah Ayaz

TI__Mastermind 21425 points

Hello,

I've just imported your project and ADC is reading without any problem. The only difference is compiler version since I don't have the last one. I'll install it and try again.

0 Hamzah Ayaz over 7 years ago in reply to Miro

Prodigy 60 points

Hi Miro,

So if the code is fine then do you think there is problem with hardware? if so would you have any knowledge of what exactly might be causing the problem?

Thanks

0 Miro over 7 years ago in reply to Hamzah Ayaz

TI__Mastermind 21425 points

Hello,

I did a test with the latest compiler version and ADC readings are fine. The only modification I've made is changing channels to 8 and 9 (onboard temperature sensor ans light sensor).

0 Hamzah Ayaz over 7 years ago in reply to Miro

Prodigy 60 points

Thanks for the confirmation Miro, turns out it is a hardware issue as the board itself is heating (which i somehow did not notice) but for now i have managed to get values by skipping the adcIsConvertionComplete() function and just adding delays in its place (hoping that the values are converted during that delay period). the rest of the board is still (somehow) working fine.

Thanks again for the help!

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CCS/TMS570LC4357: ADC module stuck in Conversion Loop