blob: 280b232374ffcb1667cd741515779906d16ab1e7 [file] [log] [blame]
/*
*
* Copyright (c) 2021 Project CHIP Authors
* All rights reserved.
*
* 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
*
* http://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.
*/
/*
* @file PigweedLogger.cpp
*
* This file contains basic string writting function, based on Pigweed HDLC
* over UART transport. It allows to send log messages even if the application
* needs to use HDLC/UART for another purpose like the RPC server.
*/
#include <FreeRTOS.h>
#include "semphr.h"
#include <pw_hdlc/encoder.h>
#include <pw_stream/sys_io_stream.h>
#include <pw_sys_io_efr32/init.h>
#include "pw_span/span.h"
#include <cassert>
#include <cstdint>
#include <string_view>
namespace PigweedLogger {
namespace {
constexpr uint8_t kLogHdlcAddress = 1; // Send log messages to HDLC address 1 (other than RPC communication)
constexpr size_t kWriteBufferSize = 128; // Buffer for constructing HDLC frames
// Exclusive access to the backend is needed to make sure that log messages coming
// from different threads are not interwoven.
SemaphoreHandle_t sLoggerLock;
static pw::stream::SysIoWriter sWriter;
static size_t sWriteBufferPos;
static char sWriteBuffer[kWriteBufferSize];
static void send(void)
{
pw::hdlc::WriteUIFrame(kLogHdlcAddress, pw::as_bytes(pw::span(sWriteBuffer, sWriteBufferPos)), sWriter);
sWriteBufferPos = 0;
}
} // namespace
void init(void)
{
sLoggerLock = xSemaphoreCreateMutex();
assert(sLoggerLock != NULL);
pw_sys_io_Init();
}
int putString(const char * buffer, size_t size)
{
xSemaphoreTake(sLoggerLock, portMAX_DELAY);
assert(sWriteBufferPos < kWriteBufferSize);
for (size_t i = 0; i < size; ++i)
{
// Send each line excluding "\r\n" in a separate frame
if (buffer[i] == '\r')
continue;
if (buffer[i] == '\n')
{
send();
continue;
}
sWriteBuffer[sWriteBufferPos++] = buffer[i];
if (sWriteBufferPos == kWriteBufferSize)
send();
}
xSemaphoreGive(sLoggerLock);
return size;
}
SemaphoreHandle_t * GetSemaphore()
{
return &sLoggerLock;
}
} // namespace PigweedLogger