2.0 KiB
AsyncAnalog
Arduino Library for async reading of an analogue pin. [AVR ONLY]
Description
AsyncAnalog is a library to read the analogue port of an AVR in an asynchronous way. This means that the user must explicitly start the ADC, check if it is ready and read out its value.
By using this class, the user prevents the (~112 uSec) blocking of the analogRead() call, and gives the user the ability to do some processing.
The library works only for AVR boards now, other platforms might be supported in the future.
As the UNO has only one ADC that is multiplexed, one can only read one analogue pin in async way simultaneously.
Interface
- AsyncAnalog(uint8_t pin) constructor, defines the analogue pin to use.
- void start() triggers a new ADC reading.
- bool ready() returns true if sample is complete
- int value() returns the value
Operation
The example asyncAnalogTest2.ino shows a loop of 1000 analogReads and prints over Serial at 115200 baud. The async test does this in less time. Note that faster baud rates shows an even bigger difference.
During the printing, the sampling continues.
Future
- investigate other platforms
- fall back to normal analogRead for non AVR platforms ?