The ADC screen is shown here:. Each configuration option is selected as a checkbox or from a dropdown menu. After the selections are made, then the code is generated and placed in the project. Two files are created named adc. Return to Top. Development Tools What tools do I need? Packs vs. What is contained in DFPs?
How are DFPs Distributed? Add Existing Items From Folders Overview II. Getting Started III. Hardware User's Guide IV.
What is USB? How are the Coefficients Calculated? Physical Memory Virtual vs. The recommended analog source impedance Rs in the formula is 2. Impedance lesser than this will cause the acquisition time to also decrease. An interrupt can also be configured to trigger when the conversion is complete. For the next conversion, go to step 1 or step 2 as required. It is advisable to introduce a delay between reads that covers the conversion period.
The returned bit integer value adval on the function above can be printed out to the serial port or to an LCD by first converting it to string.
XC8 has the itoa function for that. If the value is above an LED is turned on and if it is below, it is turned off. Just make sure you wait 5us before starting your conversion so the analog value is correctly sampled. CHS : Analog channel select. This selects which voltage is fed into the ADC. Setting this anywhere from 0 to 11 selects AN0 to AN11 respectively.
A setting of 12 feeds CVref Comparator voltage reference. Setting CHS to 13 connects the 0. Make sure to wait at least 5us before doing this after changing the input channel or performing a previous conversion.
This bit is read to see if the current conversion is complete. The ADC will automatically reset this bit to 0 when conversion finishes. Set this to 1 to generate interrupts when the ADC completes a conversion. This will be set to 1 by the ADC when a conversion completes.
This must be cleared by software in the interrupt service routine to prepare the interrupt flag for the next conversion. This is the end of the Beginner's Guide.
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