send command to htmi switch

This commit is contained in:
VE3NEA 2020-06-19 10:05:13 -04:00
parent 515805fc1a
commit 8623c79c78
3 changed files with 128 additions and 0 deletions

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@ -0,0 +1,106 @@
#include "HdmiSwitch.h"
#include "base/Log.h"
static string lastPortSettings("");
string deviceName;
int baudRate, dataBits, parity, stopBits;
static HANDLE comPort = INVALID_HANDLE_VALUE;
void HdmiSwitch::SendCommand(const string & command, const string & portSettings)
{
try
{
LOG((CLOG_INFO "Sending command to HDMI switch. Command: %s, portSettings: %s", command.c_str(), portSettings.c_str()));
if (comPort == INVALID_HANDLE_VALUE || lastPortSettings.compare(portSettings) != 0)
{
ParsePortSettings(portSettings);
OpenComPort();
}
SendStringToComPort(command);
}
catch (std::exception & e)
{
LOG((CLOG_ERR "Unable to send command to HDMI switch: %s", e.what()));
}
}
void HdmiSwitch::ParsePortSettings(const string& portSettings)
{
lastPortSettings = portSettings;
if (comPort != INVALID_HANDLE_VALUE) CloseHandle(comPort);
try
{
//device name
int posB = 0;
int posE = portSettings.find('-');
string deviceName = string("\\\\.\\") + portSettings.substr(posB, posE - posB);
//baud rate
posB = posE + 1;
posE = portSettings.find('-', posB);
baudRate = std::stoi(portSettings.substr(posB, posE - posB));
//data bits
posB = posE + 1;
dataBits = portSettings[posB] - '0';
//parity bit
posB = posB + 1;
const string parityLetters = "NOEMS";
parity = parityLetters.find(portSettings[posB]);
//stop bits
posB = posB + 1;
posE = portSettings.length() + 1;
string stopBitsString = portSettings.substr(posB, posE - posB);
stopBits = ONESTOPBIT;
if (stopBitsString == "1.5") stopBits = ONE5STOPBITS;
else if (stopBitsString == "2") stopBits = TWOSTOPBITS;
LOG((CLOG_INFO "COM port settings: device '%s' baud %d data %d parity %d stop %d", deviceName.c_str(), baudRate, dataBits, parity, stopBits));
}
catch (std::exception& e)
{
throw std::invalid_argument("Port settings string could not be parsed.");
}
}
void HdmiSwitch::OpenComPort()
{
try
{
//open com port
comPort = CreateFile(deviceName.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (comPort == INVALID_HANDLE_VALUE) throw std::exception("");
//set port parameters
DCB params = { 0 };
params.DCBlength = sizeof(params);
if (!GetCommState(comPort, &params)) throw std::exception("");
params.BaudRate = baudRate;
params.ByteSize = dataBits;
params.Parity = parity;
params.StopBits = stopBits;
if (!SetCommState(comPort, &params)) throw std::exception("");
//set timeouts
COMMTIMEOUTS timeouts = { 50, 10, 50, 10, 50 };
if (!SetCommTimeouts(comPort, &timeouts)) throw std::exception("");
}
catch (std::exception & e)
{
if (comPort != INVALID_HANDLE_VALUE) CloseHandle(comPort);
comPort = INVALID_HANDLE_VALUE;
throw std::exception("COM port could not be opened.");
}
}
void HdmiSwitch::SendStringToComPort(const string & command)
{
DWORD bytes_written = 0;
if (!WriteFile(comPort, command.c_str(), command.length(), &bytes_written, NULL))
throw std::exception("Write to COM port failed.");
}

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@ -0,0 +1,14 @@
#pragma once
#include <string>
using std::string;
class HdmiSwitch
{
private:
static void ParsePortSettings(const string & portSettings);
static void OpenComPort();
static void SendStringToComPort(const string & command);
public:
static void SendCommand(const string & command, const string & portSettings);
};

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@ -43,6 +43,7 @@
#include "base/IEventQueue.h"
#include "base/Log.h"
#include "base/TMethodEventJob.h"
#include "barrier/HdmiSwitch.h"
#include <cstring>
#include <cstdlib>
@ -523,6 +524,13 @@ Server::switchScreen(BaseClientProxy* dst,
else {
m_active->mouseMove(x, y);
}
//TODO: make command and portSettings editable, e.g., in ScreenSettingsDialog
const std::string & command = (dst == m_primaryClient) ? "port0R" : "port1R";
const std::string & portSettings = "COM4-9600-8N1";
if (!command.empty() && !portSettings.empty())
HdmiSwitch::SendCommand(command, portSettings);
}
void