This page collects ring oscillator timing tests for embedded systems (the prior page is here).
The GPIO test measures how quickly pins can communicate with a processor core. Two pins are connected; a bit is output on one, read on the other, and inverted in software, with the frequency of the resulting oscillation reported.
| frequency (MHz) | processor/board | description | code | date |
|---|---|---|---|---|
| 2.528 | SAMD11C | IOBUS | ring.D11C.ino | November 13, 2020 |
| 1.818 | ATtiny412 | VPORT | ring.t412.ino | November 13, 2020 |
| 1.171 | SAMD11C | PORT | ring.D11C.ino | November 13, 2020 |
| 1.056 | ATtiny412 | PORT | ring.t412.ino | November 13, 2020 |
| 0.358 | ATtiny412 | digitalRead/Write | ring.t412.ino | November 13, 2020 |