ADC Drivers

Narenda,

As Steve mentioned in an earlier post, he filed this enhancement request for TI-RTOS on your behalf but it has not been committed to any particular release. At this point given the backlog of other work, I don't anticipate that one would be released this year.

To address your question in the short term, Steve's original response of pointing you to the TivaWare software library is probably your best option. With regard to the question of thread safety, I believe that you can use all of the DriverLib functions from task context. What is not safe is to have multiple tasks manipulating the same peripheral hardware via TivaWare's DriverLib concurrently.

For example, a single task using the ADC module from TivaWare DriverLib is fine -- for example, the programming example in section 4.3 of the TivaWare User's Guide (shown below) should work. If you have further questions about TivaWare and how best to leverage it, I encourage you to post your questions to the TM4C Microcontrollers Forum for the experts there to answer.



4.3 Programming Example
The following example shows how to use the ADC API to initialize a sample sequencer for processor
triggering, trigger the sample sequence, and then read back the data when it is ready.

uint32_t ui32Value;
//
// Enable the first sample sequencer to capture the value of channel 0 when
// the processor trigger occurs.
//
ADCSequenceConfigure(ADC0_BASE, 0, ADC_TRIGGER_PROCESSOR, 0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 0,
ADC_CTL_IE | ADC_CTL_END | ADC_CTL_CH0);
ADCSequenceEnable(ADC0_BASE, 0);
//
// Trigger the sample sequence.
//
ADCProcessorTrigger(ADC0_BASE, 0);
//
// Wait until the sample sequence has completed.
//
while(!ADCIntStatus(ADC0_BASE, 0, false))
{
}
//
// Read the value from the ADC.
//
ADCSequenceDataGet(ADC0_BASE, 0, &ui32Value);