Retro68/LaunchAPPL/Client/Serial.cc

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#include "Serial.h"
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#include "StreamBasedLauncher.h"
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#include "Utilities.h"
#include "Stream.h"
#include "ReliableStream.h"
#include "ServerProtocol.h"
#include <termios.h>
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#include <unistd.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <poll.h>
#include <chrono>
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#include <iostream>
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namespace po = boost::program_options;
using namespace std::literals::chrono_literals;
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class SerialStream : public WaitableStream
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{
static const long kReadBufferSize = 4096;
uint8_t readBuffer[kReadBufferSize];
public:
int fd;
int baud;
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virtual void write(const void* p, size_t n) override;
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virtual void wait() override;
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SerialStream(po::variables_map &options);
~SerialStream();
};
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class SerialLauncher : public StreamBasedLauncher
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{
SerialStream stream;
ReliableStream rStream;
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public:
SerialLauncher(po::variables_map& options);
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};
SerialStream::SerialStream(po::variables_map &options)
{
std::string port = options["serial-port"].as<std::string>();
baud = options["serial-baud"].as<int>();
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fd = open(port.c_str(), O_RDWR | O_NOCTTY | O_NDELAY );
if(fd < 0)
throw std::runtime_error("Cannot open serial port.\n");
struct termios tios;
tcgetattr(fd,&tios);
tios.c_cflag = CRTSCTS | CS8 | CLOCAL | CREAD;
switch(baud)
{
case 9600: tios.c_cflag |= B9600; break;
case 19200: tios.c_cflag |= B19200; break;
case 38400: tios.c_cflag |= B38400; break;
case 57600: tios.c_cflag |= B57600; break;
case 115200: tios.c_cflag |= B115200; break;
case 230400: tios.c_cflag |= B230400; break;
default:
throw std::runtime_error("Unsupported baud rate.\n");
}
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tios.c_iflag = 0;//IGNPAR | ICRNL;
tios.c_lflag = 0;
tios.c_oflag = 0;
tios.c_cc[VTIME] = 0; /* inter-character timer unused */
tios.c_cc[VMIN] = 1; /* blocking read until 1 chars received */
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tcsetattr(fd,TCSANOW,&tios);
usleep(500000);
}
SerialStream::~SerialStream()
{
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tcdrain(fd);
usleep(500000);
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close(fd);
}
void SerialStream::write(const void* p, size_t n)
{
while(n)
{
struct pollfd pfd;
pfd.fd = fd;
pfd.events = POLLOUT;
pfd.revents = 0;
poll(&pfd, 1, 1000);
if(pfd.revents & POLLOUT)
{
ssize_t written = ::write(fd, p, n);
if(written > 0)
{
p = (const void*) ( (const char*)p + written );
n -= written;
}
}
}
}
void SerialStream::wait()
{
struct pollfd pfd;
pfd.fd = fd;
pfd.events = POLLIN;
pfd.revents = 0;
poll(&pfd, 1, 1000);
if(pfd.revents & POLLIN)
{
ssize_t n = ::read(fd, readBuffer, kReadBufferSize);
if(n > 0)
{
notifyReceive(readBuffer, n);
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}
}
}
SerialLauncher::SerialLauncher(po::variables_map &options)
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: StreamBasedLauncher(options), stream(options), rStream(&stream)
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{
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SetupStream(&stream, &rStream);
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do
{
rStream.reset(1);
std::cerr << "Connecting... (" << stream.baud << " baud)" << std::endl;
using clock = std::chrono::steady_clock;
auto startTime = clock::now();
while(!rStream.resetResponseArrived() && clock::now() - startTime < 5s)
stream.wait();
} while(!rStream.resetResponseArrived());
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std::cerr << "Connected." << std::endl;
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}
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void Serial::GetOptions(options_description &desc)
{
desc.add_options()
("serial-port", po::value<std::string>()->default_value("/dev/ttyUSB0"), "serial port to use")
("serial-baud", po::value<int>()->default_value(19200), "serial port speed")
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;
}
bool Serial::CheckOptions(variables_map &options)
{
return true;
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}
std::unique_ptr<Launcher> Serial::MakeLauncher(variables_map &options)
{
return std::unique_ptr<Launcher>(new SerialLauncher(options));
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}