From f64a3154daca5a424babcd16bec852235b4d309c Mon Sep 17 00:00:00 2001
From: Neil Gershenfeld <gersh@cba.mit.edu>
Date: Sun, 25 Dec 2022 17:11:55 -0500
Subject: [PATCH] add RP2040
---
GPIO/RP2040/ring.RP2040.ino | 56 +++++++++++++++++++++++++++++++++++++
GPIO/RP2040/ring.RP2040.py | 19 +++++++++++++
2 files changed, 75 insertions(+)
create mode 100644 GPIO/RP2040/ring.RP2040.ino
create mode 100644 GPIO/RP2040/ring.RP2040.py
diff --git a/GPIO/RP2040/ring.RP2040.ino b/GPIO/RP2040/ring.RP2040.ino
new file mode 100644
index 0000000..b73dd8d
--- /dev/null
+++ b/GPIO/RP2040/ring.RP2040.ino
@@ -0,0 +1,56 @@
+//
+// ring.RP2040.ino
+// RP2040 ring oscillator test
+// connect P1 and P2
+//
+// Neil Gershenfeld 12/26/22
+//
+// 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() {
+ //
+ // nothing to do in first core
+ //
+ }
+
+void loop() {
+ }
+
+void setup1() {
+ //
+ // use second core to avoid Arduino interrupts
+ //
+ pinMode(2,OUTPUT);
+ }
+
+void loop1() {
+ //
+ // direct port I/O version
+ // 9.17 MHz at 133 MHz clock
+ //
+ uint32_t pin1 = (1 << 1);
+ uint32_t pin2 = (1 << 2);
+ while (1) {
+ if (pin1 & sio_hw->gpio_in)
+ sio_hw->gpio_clr = pin2;
+ else
+ sio_hw->gpio_set = pin2;
+ }
+ //
+ // Arduino version
+ // 584 kHz at 133 MHz clock
+ //
+ /*
+ while (1) {
+ if (digitalRead(1))
+ digitalWrite(2,LOW);
+ else
+ digitalWrite(2,HIGH);
+ }
+ */
+ }
diff --git a/GPIO/RP2040/ring.RP2040.py b/GPIO/RP2040/ring.RP2040.py
new file mode 100644
index 0000000..39f2ae4
--- /dev/null
+++ b/GPIO/RP2040/ring.RP2040.py
@@ -0,0 +1,19 @@
+#
+# ring.RP2040.py
+# RP2040 ring oscillator test
+# connect P1 and P2
+#
+# Neil Gershenfeld 12/25/22
+#
+# 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.
+#
+from machine import Pin
+machine.freq(133000000)
+p1 = Pin(1,Pin.IN)
+p2 = Pin(2,Pin.OUT)
+while (True):
+ p2.value(1-p1.value())
--
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