2.98 Sigma-Delta Analog Digital Converter (SDADC)

Using The Library

SDADC converts enabled channel on software or hardware triggers. It provides both polling and callback methods to indicate the end of conversion to read the converted data from the result register.

• With polling, the application will need to continuously poll to check if the conversion is completed.

• With callback, the registered callback function will be called once the conversion is completed. This means the application do not have to poll continuously.

Callback method

This example demonstrates how to read conversion result in the callback function. One channel is enabled and configured to start conversion on hardware trigger.

int16_t result;

/* This function is called after conversion of last channel in
the user sequence */

void SDADC_EventHandler(SDADC_STATUS status, uintptr_t context)

{

 result = SDADC_ConversionResultGet();

}



int main(void)

{

 /* Register callback function for SDADC end of conversion
interrupt*/

 SDADC_CallbackRegister(SDADC_EventHandler, (uintptr_t)NULL);



while(true)

{



}

}

Polling method

This example demonstrates how to start conversion and read the converted data in polled mode. One channel is enabled and configured to start conversion on software trigger.

/* Start conversion */

SDADC_ConversionStart();



/* Wait till ADC conversion result is available */

while(!SDADC_ConversionResultIsReady(CH0))

{



};



/* Read the ADC result */

result = SDADC_ConversionResultGet();

Library Interface

Sigma-Delta Analog Digital Converter peripheral library provides the following interfaces:

Functions

Data types and constants