Basic build environment for Teensy 4.0 programs

1 files changed, 19 insertions, 0 deletions

diff --git a/test/counter.cpp b/test/counter.cpp
new file mode 100644
index 0000000..680e233
--- /dev/null
+++ b/test/counter.cpp
@@ -0,0 +1,19 @@
+#include <Arduino.h>
+
+extern "C" int main(void) {
+  for (unsigned iPin=16; iPin <= 20; ++iPin) {
+    pinMode(iPin, OUTPUT);
+  }
+
+  std::size_t i = 0;
+
+  while (true) {
+    digitalWrite(16, (i %  2) >  0);
+    digitalWrite(17, (i %  4) >  1);
+    digitalWrite(18, (i %  8) >  3);
+    digitalWrite(19, (i % 16) >  7);
+    digitalWrite(20, (i % 32) > 15);
+    delay(analogRead(7));
+    i++;
+  }
+}