Add examples/serial-echo.cpp.

Serial1 writes back what it receives.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/examples/serial-echo.cpp b/examples/serial-echo.cpp
new file mode 100644
index 0000000..204f011
--- /dev/null
+++ b/examples/serial-echo.cpp
@@ -0,0 +1,30 @@
+// Simple serial port "echo". Send back any received data.
+
+#include <wirish/wirish.h>
+
+// Note: you can change "Serial1" to any other serial port you have on
+// your board.
+
+void setup() {
+    Serial1.begin(115200);
+}
+
+void loop() {
+    while (Serial1.available()) {
+        Serial1.write(Serial1.read());
+    }
+}
+
+// Force init() to be called before anything else.
+__attribute__((constructor)) void premain() {
+    init();
+}
+
+int main(void) {
+    setup();
+
+    while (true) {
+        loop();
+    }
+    return 0;
+}