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0790a8147f
Since pw_sys_io_Init() is not part of the pw_sys_io facade, and the backend-specific functions are only called from target-specific places, rename the backend-specific functions to include the backend as part of the name. Change-Id: I42c0eb5e8932ee73707db574847e2aed58517132 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/66862 Commit-Queue: Scott James Remnant <keybuk@google.com> Pigweed-Auto-Submit: Scott James Remnant <keybuk@google.com> Reviewed-by: Ewout van Bekkum <ewout@google.com>
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
// Copyright 2019 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include <Arduino.h>
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#include <cinttypes>
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#include <cstdint>
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#include "pw_preprocessor/compiler.h"
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#include "pw_sys_io/sys_io.h"
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extern "C" void pw_sys_io_arduino_Init() { Serial.begin(115200); }
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namespace pw::sys_io {
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// Wait for a byte to read on USART1. This blocks until a byte is read. This is
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// extremely inefficient as it requires the target to burn CPU cycles polling to
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// see if a byte is ready yet.
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Status ReadByte(std::byte* dest) {
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while (true) {
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if (TryReadByte(dest).ok()) {
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return OkStatus();
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}
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}
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}
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Status TryReadByte(std::byte* dest) {
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if (!Serial.available()) {
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return Status::Unavailable();
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}
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*dest = static_cast<std::byte>(Serial.read());
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return OkStatus();
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}
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// Send a byte over the default Arduino Serial port.
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Status WriteByte(std::byte b) {
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// Serial.write() will block until data can be written.
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Serial.write((uint8_t)b);
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return OkStatus();
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}
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// Writes a string using pw::sys_io, and add newline characters at the end.
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StatusWithSize WriteLine(const std::string_view& s) {
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size_t chars_written = 0;
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StatusWithSize result = WriteBytes(std::as_bytes(std::span(s)));
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if (!result.ok()) {
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return result;
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}
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chars_written += result.size();
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// Write trailing newline.
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result = WriteBytes(std::as_bytes(std::span("\r\n", 2)));
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chars_written += result.size();
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return StatusWithSize(result.status(), chars_written);
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}
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} // namespace pw::sys_io
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