Anthony DiGirolamo | 383be05 | 2020-11-26 12:06:41 -0800 | [diff] [blame] | 1 | // Copyright 2020 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
| 15 | #include <cstddef> |
| 16 | |
| 17 | #include "pw_hdlc/rpc_channel.h" |
| 18 | #include "pw_hdlc/rpc_packets.h" |
| 19 | #include "pw_log/log.h" |
| 20 | #include "pw_rpc_system_server/rpc_server.h" |
| 21 | #include "pw_stream/sys_io_stream.h" |
| 22 | |
| 23 | namespace pw::rpc::system_server { |
| 24 | namespace { |
| 25 | |
| 26 | constexpr size_t kMaxTransmissionUnit = 256; |
| 27 | |
| 28 | // Used to write HDLC data to pw::sys_io. |
| 29 | stream::SysIoWriter writer; |
| 30 | stream::SysIoReader reader; |
| 31 | |
| 32 | // Set up the output channel for the pw_rpc server to use. |
| 33 | hdlc::RpcChannelOutputBuffer<kMaxTransmissionUnit> hdlc_channel_output( |
| 34 | writer, pw::hdlc::kDefaultRpcAddress, "HDLC channel"); |
| 35 | Channel channels[] = {pw::rpc::Channel::Create<1>(&hdlc_channel_output)}; |
| 36 | rpc::Server server(channels); |
| 37 | |
| 38 | } // namespace |
| 39 | |
| 40 | void Init() { |
| 41 | // Send log messages to HDLC address 1. This prevents logs from interfering |
| 42 | // with pw_rpc communications. |
| 43 | pw::log_basic::SetOutput([](std::string_view log) { |
| 44 | pw::hdlc::WriteUIFrame(1, std::as_bytes(std::span(log)), writer); |
| 45 | }); |
| 46 | } |
| 47 | |
| 48 | rpc::Server& Server() { return server; } |
| 49 | |
| 50 | Status Start() { |
| 51 | // Declare a buffer for decoding incoming HDLC frames. |
| 52 | std::array<std::byte, kMaxTransmissionUnit> input_buffer; |
| 53 | hdlc::Decoder decoder(input_buffer); |
| 54 | |
| 55 | while (true) { |
| 56 | std::byte byte; |
| 57 | Status ret_val = pw::sys_io::ReadByte(&byte); |
| 58 | if (!ret_val.ok()) { |
| 59 | return ret_val; |
| 60 | } |
| 61 | if (auto result = decoder.Process(byte); result.ok()) { |
| 62 | hdlc::Frame& frame = result.value(); |
| 63 | if (frame.address() == hdlc::kDefaultRpcAddress) { |
| 64 | server.ProcessPacket(frame.data(), hdlc_channel_output); |
| 65 | } |
| 66 | } |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | } // namespace pw::rpc::system_server |