add new GPIO table

a22cd1e8 · Neil Gershenfeld (test) · a077ce57 · a22cd1e8 · a22cd1e8 · a22cd1e8
Commit a22cd1e8 authored 4 years ago by Neil Gershenfeld (test)
--- a/GPIO/ATtiny412/ring.t412.ino
+++ b/GPIO/ATtiny412/ring.t412.ino
+//
+// ring.t412.ino
+//
+// ATtiny412 ring oscillator test
+//
+// Neil Gershenfeld 11/13/20
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+
+void setup() {
+   CPU_CCP = CCP_IOREG_gc; // unprotect clock
+   CLKCTRL.MCLKCTRLB = 0; // turn off prescalar (20 MHz)
+   PORTA.DIRSET = PIN6_bm; // set output pin
+   }
+
+void loop() {
+   while(1) {
+      //
+      // VPORT: 1.818 MHz
+      //    250 ns high (5 cycles), 300 ns low (6 cycles)
+      //
+      if (VPORTA.IN & PIN7_bm)
+         VPORTA.OUT &= ~PIN6_bm;
+      else
+         VPORTA.OUT |= PIN6_bm;
+      //
+      // PORT: 1.056 MHz
+      //
+      /*
+      if (PORTA.IN & PIN7_bm)
+         PORTA.OUTCLR = PIN6_bm;
+      else
+         PORTA.OUTSET = PIN6_bm;
+      */
+      //
+      // library: 0.358 MHz
+      //
+      /*
+      if (digitalRead(1))
+         digitalWrite(0,LOW);
+      else
+         digitalWrite(0,HIGH);
+      */
+      }
+   }
--- a/GPIO/SAMD11C/ring.D11C.ino
+++ b/GPIO/SAMD11C/ring.D11C.ino
+//
+// ring.D11C.ino
+//
+// SAMD11C ring oscillator test
+//
+// Neil Gershenfeld 11/13/20
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+
+void setup() {
+   SYSCTRL->OSC8M.bit.PRESC = 0; // turn off prescalar (48 MHz)
+   REG_PORT_DIR0 = PORT_PA02; // set output pin
+   PORT->Group[0].PINCFG[4].reg = PORT_PINCFG_INEN; // turn on input pin
+   PORT->Group[0].CTRL.reg = PORT_PA04; // turn on continuous sampling
+   }
+
+void loop() {
+  while (1) {
+      //
+      // IOBUS: 2.528 MHz
+      //
+      if (PORT_IOBUS->Group[0].IN.reg & PORT_PA04)
+         PORT_IOBUS->Group[0].OUTCLR.reg = PORT_PA02;
+      else
+         PORT_IOBUS->Group[0].OUTSET.reg = PORT_PA02;
+      //
+      // PORT: 1.171 MHz
+      //
+      /*
+      if (REG_PORT_IN0 & PORT_PA04)
+         REG_PORT_OUTCLR0 = PORT_PA02;
+      else
+         REG_PORT_OUTSET0 = PORT_PA02;
+      */
+      }
+   }
--- a/index.html
+++ b/index.html
@@ -6,4 +6,79 @@
 </head>
 <body link="black" alink="black" vlink="black">
 <font face="bitstream vera sans,arial,helvetica,sans-serif">
-prior page <a href=prior/index.html>here</a>
+
+<div style="margin-left:2.5%;margin-right:2.5%">
+
+<p>
+
+<center>
+<b>Ring Oscillators</b>
+</center>
+
+<p>
+
+This page collects ring oscillator timing tests for embedded systems (the prior page is <a href=prior/index.html>here</a>).
+
+<p>
+
+<center>
+<b>GPIO</b>
+</center>
+
+<p>
+
+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.
+
+<center>
+<table border="1" style="text-align:center">
+
+<tr>
+<th>frequency (MHz)</th>
+<th>processor/board</th>
+<th>description</th>
+<th>code</th>
+<th>date</th>
+</tr>
+
+<tr>
+<td>2.528</td>
+<td>SAMD11C</td>
+<td>IOBUS</td>
+<td><a href=GPIO/SAMD11C/ring.D11C.ino>ring.D11C.ino</a></td>
+<td>November 13, 2020</td>
+</tr>
+
+<tr>
+<td>1.818</td>
+<td>ATtiny412</td>
+<td>VPORT</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
+<td>November 13, 2020</td>
+</tr>
+
+<tr>
+<td>1.171</td>
+<td>SAMD11C</td>
+<td>PORT</td>
+<td><a href=GPIO/SAMD11C/ring.D11C.ino>ring.D11C.ino</a></td>
+<td>November 13, 2020</td>
+</tr>
+
+<tr>
+<td>1.056</td>
+<td>ATtiny412</td>
+<td>PORT</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
+<td>November 13, 2020</td>
+</tr>
+
+<tr>
+<td>0.358</td>
+<td>ATtiny412</td>
+<td>digitalRead/Write</td>
+<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
+<td>November 13, 2020</td>
+</tr>
+
+</table>
+</center>