From d59e06cdf635a813d80d924a3d96ee1652510316 Mon Sep 17 00:00:00 2001
From: Neil Gershenfeld <gersh@cba.mit.edu>
Date: Sun, 6 Dec 2020 18:05:58 -0500
Subject: [PATCH] wip
---
GPIO/ESP32/ring.ESP32.ino | 34 ++++++++++++++++++++++++++++++++++
index.html | 7 +++++++
2 files changed, 41 insertions(+)
create mode 100644 GPIO/ESP32/ring.ESP32.ino
diff --git a/GPIO/ESP32/ring.ESP32.ino b/GPIO/ESP32/ring.ESP32.ino
new file mode 100644
index 0000000..11d1ea5
--- /dev/null
+++ b/GPIO/ESP32/ring.ESP32.ino
@@ -0,0 +1,34 @@
+//
+// ring.ESP32.ino
+//
+// ESP32 ring oscillator test
+//
+// Neil Gershenfeld 12/6/20
+//
+// 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.
+//
+
+uint32_t input,output;
+
+void setup() {
+ setCpuFrequencyMhz(240);
+ output = 1 << 16;
+ input = 1 << 17;
+ GPIO.enable_w1ts = output;
+ }
+
+void loop() {
+ while (1) {
+ //
+ // GPIO: 3.81 MHz
+ //
+ if (GPIO.in & input)
+ GPIO.out_w1tc = output;
+ else
+ GPIO.out_w1ts = output;
+ }
+ }
diff --git a/index.html b/index.html
index 394c4be..2925eb9 100644
--- a/index.html
+++ b/index.html
@@ -53,6 +53,13 @@ The GPIO test measures how quickly pins can communicate with a processor core; t
<td>October, 2015</td>
</tr>
+<tr>
+<td>3.810</td>
+<td>ESP32-WROOM</td>
+<td><a href=GPIO/ESP32/ring.ESP32.ino>GPIO</a></td>
+<td>December, 2020</td>
+</tr>
+
<tr>
<td>2.528</td>
<td>ATSAMD11C</td>
--
GitLab