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// 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_arduino_Init() { Serial.begin(115200); }
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 (TryReadByte(dest).ok()) {
return OkStatus();
}
}
}
Status TryReadByte(std::byte* dest) {
if (!Serial.available()) {
return Status::Unavailable();
}
*dest = static_cast<std::byte>(Serial.read());
return OkStatus();
}
// Send a byte over the default Arduino Serial port.
Status WriteByte(std::byte b) {
// Serial.write() will block until data can be written.
Serial.write((uint8_t)b);
return OkStatus();
}
// 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
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