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CCS / EK-TM4C123GXL:EK-TM4C123GXL

Part Number: EK-TM4C123GXL

Tool/software: Code Composer Studio

My application is to collect an analogic signal from a GPIO in a periodic frequency. After that, I need to operate with this values.

My problem is to configure the ADC to be triggered by the timer in a specific frequency. How can I do that ? 

For example I want to grab a sample in each 5ms. How can I configure the ADC for this situation?

I can only use the APIs of TIVA_c_Series, I do not know why but I could not change a specific register by myself .