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71 lines
2.1 KiB
71 lines
2.1 KiB
4 months ago
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// Copyright 2020 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 <cstddef>
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#include "pw_hdlc/rpc_channel.h"
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#include "pw_hdlc/rpc_packets.h"
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#include "pw_log/log.h"
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#include "pw_rpc_system_server/rpc_server.h"
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#include "pw_stream/sys_io_stream.h"
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namespace pw::rpc::system_server {
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namespace {
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constexpr size_t kMaxTransmissionUnit = 256;
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// Used to write HDLC data to pw::sys_io.
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stream::SysIoWriter writer;
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stream::SysIoReader reader;
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// Set up the output channel for the pw_rpc server to use.
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hdlc::RpcChannelOutputBuffer<kMaxTransmissionUnit> hdlc_channel_output(
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writer, pw::hdlc::kDefaultRpcAddress, "HDLC channel");
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Channel channels[] = {pw::rpc::Channel::Create<1>(&hdlc_channel_output)};
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rpc::Server server(channels);
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} // namespace
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void Init() {
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// Send log messages to HDLC address 1. This prevents logs from interfering
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// with pw_rpc communications.
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pw::log_basic::SetOutput([](std::string_view log) {
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pw::hdlc::WriteUIFrame(1, std::as_bytes(std::span(log)), writer);
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});
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}
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rpc::Server& Server() { return server; }
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Status Start() {
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// Declare a buffer for decoding incoming HDLC frames.
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std::array<std::byte, kMaxTransmissionUnit> input_buffer;
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hdlc::Decoder decoder(input_buffer);
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while (true) {
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std::byte byte;
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Status ret_val = pw::sys_io::ReadByte(&byte);
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if (!ret_val.ok()) {
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return ret_val;
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}
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if (auto result = decoder.Process(byte); result.ok()) {
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hdlc::Frame& frame = result.value();
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if (frame.address() == hdlc::kDefaultRpcAddress) {
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server.ProcessPacket(frame.data(), hdlc_channel_output);
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}
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}
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}
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}
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} // namespace pw::rpc::system_server
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