Arduino Pigweed Target
- New arduino pigweed target that uses gn build args to set arduino
target board and specific build options.
- Add arduinobuilder.py (includes core installer for Linux/Mac/Windows)
- Working builds for Teensy 4.1, 4.0, 3.6, 3.5, 3.2
Change-Id: Ib751b5f92352ac3ec7fa649f444dc13efd080d12
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/18001
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
diff --git a/pw_sys_io_arduino/sys_io_arduino.cc b/pw_sys_io_arduino/sys_io_arduino.cc
new file mode 100644
index 0000000..b63e21f
--- /dev/null
+++ b/pw_sys_io_arduino/sys_io_arduino.cc
@@ -0,0 +1,75 @@
+// Copyright 2019 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include <Arduino.h>
+
+#include <cinttypes>
+#include <cstdint>
+
+#include "pw_preprocessor/compiler.h"
+#include "pw_sys_io/sys_io.h"
+
+extern "C" void pw_sys_io_Init() {
+ Serial.begin(115200);
+ // Wait for serial port to be available
+ while (!Serial) {
+ }
+}
+
+namespace pw::sys_io {
+
+// Wait for a byte to read on USART1. This blocks until a byte is read. This is
+// extremely inefficient as it requires the target to burn CPU cycles polling to
+// see if a byte is ready yet.
+
+Status ReadByte(std::byte* dest) {
+ while (true) {
+ if (Serial.available()) {
+ *dest = static_cast<std::byte>(Serial.read());
+ break;
+ }
+ }
+ return Status::OK;
+}
+
+// Send a byte over USART1. Since this blocks on every byte, it's rather
+// inefficient. At the default baud rate of 115200, one byte blocks the CPU for
+// ~87 micro seconds. This means it takes only 10 bytes to block the CPU for
+// 1ms!
+Status WriteByte(std::byte b) {
+ // Wait for TX buffer to be empty. When the buffer is empty, we can write
+ // a value to be dumped out of UART.
+ while (Serial.availableForWrite() < 1) {
+ }
+ Serial.write((uint8_t)b);
+ return Status::OK;
+}
+
+// Writes a string using pw::sys_io, and add newline characters at the end.
+StatusWithSize WriteLine(const std::string_view& s) {
+ size_t chars_written = 0;
+ StatusWithSize result = WriteBytes(std::as_bytes(std::span(s)));
+ if (!result.ok()) {
+ return result;
+ }
+ chars_written += result.size();
+
+ // Write trailing newline.
+ result = WriteBytes(std::as_bytes(std::span("\r\n", 2)));
+ chars_written += result.size();
+
+ return StatusWithSize(result.status(), chars_written);
+}
+
+} // namespace pw::sys_io