| // Copyright 2020 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 <array> |
| #include <span> |
| #include <string_view> |
| |
| #include "pw_hdlc_lite/encoder.h" |
| #include "pw_hdlc_lite/rpc_channel.h" |
| #include "pw_hdlc_lite/rpc_packets.h" |
| #include "pw_hdlc_lite/sys_io_stream.h" |
| #include "pw_log/log.h" |
| #include "pw_rpc/echo_service_nanopb.h" |
| #include "pw_rpc/server.h" |
| |
| namespace hdlc_example { |
| namespace { |
| |
| using std::byte; |
| |
| constexpr size_t kMaxTransmissionUnit = 256; |
| |
| // Used to write HDLC data to pw::sys_io. |
| pw::stream::SysIoWriter writer; |
| |
| // Set up the output channel for the pw_rpc server to use to use. |
| pw::hdlc_lite::RpcChannelOutputBuffer<kMaxTransmissionUnit> hdlc_channel_output( |
| writer, pw::hdlc_lite::kDefaultRpcAddress, "HDLC channel"); |
| |
| pw::rpc::Channel channels[] = { |
| pw::rpc::Channel::Create<1>(&hdlc_channel_output)}; |
| |
| // Declare the pw_rpc server with the HDLC channel. |
| pw::rpc::Server server(channels); |
| |
| pw::rpc::EchoService echo_service; |
| |
| void RegisterServices() { server.RegisterService(echo_service); } |
| |
| } // namespace |
| |
| void Start() { |
| // Send log messages to HDLC address 1. This prevents logs from interfering |
| // with pw_rpc communications. |
| pw::log_basic::SetOutput([](std::string_view log) { |
| pw::hdlc_lite::WriteInformationFrame( |
| 1, std::as_bytes(std::span(log)), writer); |
| }); |
| |
| // Set up the server and start processing data. |
| RegisterServices(); |
| |
| // Declare a buffer for decoding incoming HDLC frames. |
| std::array<std::byte, kMaxTransmissionUnit> input_buffer; |
| |
| PW_LOG_INFO("Starting pw_rpc server"); |
| pw::hdlc_lite::ReadAndProcessPackets( |
| server, hdlc_channel_output, input_buffer); |
| } |
| |
| } // namespace hdlc_example |