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jSerialComm
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Set FTDI latency using registry on Windows (requires admin)

This commit is contained in:
Will Hedgecock 2022-01-20 15:16:35 -06:00
parent 3b6f11123a
commit adddb318b4
8 changed files with 87 additions and 11 deletions
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2
src/main/c/Windows/Makefile
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@ -10,7 +10,7 @@ LINK_ARM64 := aarch64-pc-windows-msvc-link
CFLAGS := /c /O2 /GF /MT /EHsc /J /nologo /TC
LDFLAGS := /DLL /NOLOGO
INCLUDES := /I"$(JDK_HOME)/include" /I"$(JDK_HOME)/include/win32" /I"$(JDK_HOME)/include/linux" /I"$(JDK_HOME)/include/darwin" /I"$(JDK_HOME)/include/solaris"
LIBRARIES := advapi32.lib setupapi.lib
LIBRARIES := advapi32.lib setupapi.lib shell32.lib
DELETE := @rm
MKDIR := @mkdir
COPY := @cp

2
src/main/c/Windows/Makefile.native
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@ -4,7 +4,7 @@ LINK = link
CFLAGS = /c /O2 /GF /GL /MT /EHsc /fp:precise /J /nologo /TC
LDFLAGS = /DLL /LTCG /NOASSEMBLY /NOLOGO
INCLUDES = /I"$(JDK_HOME)\include" /I"$(JDK_HOME)\include\win32"
LIBRARIES = Advapi32.lib SetupAPI.lib
LIBRARIES = Advapi32.lib SetupAPI.lib Shell32.lib
DELETE = @del /q /f
RMDIR = @rd /q /s
MKDIR = @md

92
src/main/c/Windows/SerialPort_Windows.c
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@ -2,7 +2,7 @@
* SerialPort_Windows.c
*
* Created on: Feb 25, 2012
* Last Updated on: Jan 18, 2022
* Last Updated on: Jan 20, 2022
* Author: Will Hedgecock
*
* Copyright (C) 2012-2022 Fazecast, Inc.
@ -31,9 +31,11 @@
#include <initguid.h>
#include <windows.h>
#include <delayimp.h>
#include <direct.h>
#include <stdlib.h>
#include <string.h>
#include <setupapi.h>
#include <shellapi.h>
#include <devpkey.h>
#include <devguid.h>
#include "ftdi/ftd2xx.h"
@ -74,7 +76,6 @@ jfieldID eventFlagsField;
typedef int (__stdcall *FT_CreateDeviceInfoListFunction)(LPDWORD);
typedef int (__stdcall *FT_GetDeviceInfoListFunction)(FT_DEVICE_LIST_INFO_NODE*, LPDWORD);
typedef int (__stdcall *FT_GetComPortNumberFunction)(FT_HANDLE, LPLONG);
typedef int (__stdcall *FT_SetLatencyTimerFunction)(FT_HANDLE, UCHAR);
typedef int (__stdcall *FT_OpenFunction)(int, FT_HANDLE*);
typedef int (__stdcall *FT_CloseFunction)(FT_HANDLE);
@ -250,8 +251,7 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
FT_GetComPortNumberFunction FT_GetComPortNumber = (FT_GetComPortNumberFunction)GetProcAddress(ftdiLibInstance, "FT_GetComPortNumber");
FT_OpenFunction FT_Open = (FT_OpenFunction)GetProcAddress(ftdiLibInstance, "FT_Open");
FT_CloseFunction FT_Close = (FT_CloseFunction)GetProcAddress(ftdiLibInstance, "FT_Close");
FT_SetLatencyTimerFunction FT_SetLatencyTimer = (FT_SetLatencyTimerFunction)GetProcAddress(ftdiLibInstance, "FT_SetLatencyTimer");
if (FT_CreateDeviceInfoList && FT_GetDeviceInfoList && FT_GetComPortNumber && FT_Open && FT_Close && FT_SetLatencyTimer)
if (FT_CreateDeviceInfoList && FT_GetDeviceInfoList && FT_GetComPortNumber && FT_Open && FT_Close)
{
DWORD numDevs;
if ((FT_CreateDeviceInfoList(&numDevs) == FT_OK) && (numDevs > 0))
@ -278,13 +278,90 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
LONG comPortNumber = 0;
if ((FT_Open(i, &devInfo[i].ftHandle) == FT_OK) && (FT_GetComPortNumber(devInfo[i].ftHandle, &comPortNumber) == FT_OK))
{
// Check if COM port is actually connected and present in the port list
// Close port and check if actually connected and present in the port list
FT_Close(devInfo[i].ftHandle);
swprintf(comPort, sizeof(comPort) / sizeof(wchar_t), L"COM%ld", comPortNumber);
for (int j = 0; j < serialPorts.length; ++j)
if (wcscmp(serialPorts.ports[j]->portPath, comPort) == 0)
{
// Reduce latency timer to minimum value of 2
FT_SetLatencyTimer(devInfo[i].ftHandle, 2);
// Reduce the port's latency timer to minimum value of 2
HKEY key, paramKey = 0;
if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Enum\\FTDIBUS", 0, KEY_READ, &key) == ERROR_SUCCESS)
{
DWORD index = 0, latency = 2, subkeySize = 255, portNameSize = 16, oldLatency = 2, oldLatencySize = sizeof(DWORD);
wchar_t *subkey = (wchar_t*)malloc(subkeySize*sizeof(wchar_t)), *regPortName = (wchar_t*)malloc(portNameSize*sizeof(wchar_t));
while (RegEnumKeyExW(key, index++, subkey, &subkeySize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS)
{
char *subkeyString = (char*)malloc(subkeySize);
memset(subkeyString, 0, subkeySize);
wcstombs(subkeyString, subkey, subkeySize);
subkeySize = 255;
portNameSize = 16;
memset(regPortName, 0, portNameSize * sizeof(wchar_t));
wcscat_s(subkey, subkeySize, L"\\0000\\Device Parameters");
if (RegOpenKeyExW(key, subkey, 0, KEY_QUERY_VALUE, &paramKey) == ERROR_SUCCESS)
{
if ((RegQueryValueExW(paramKey, L"PortName", NULL, NULL, (LPBYTE)regPortName, &portNameSize) == ERROR_SUCCESS) && (wcscmp(serialPorts.ports[j]->portPath, regPortName) == 0))
RegQueryValueExW(paramKey, L"LatencyTimer", NULL, NULL, (LPBYTE)&oldLatency, &oldLatencySize);
RegCloseKey(paramKey);
}
if (oldLatency > latency)
{
if (RegOpenKeyExW(key, subkey, 0, KEY_SET_VALUE, &paramKey) == ERROR_SUCCESS)
{
RegSetValueExW(paramKey, L"LatencyTimer", 0, REG_DWORD, (LPBYTE)&latency, sizeof(latency));
RegCloseKey(paramKey);
}
else
{
// Create registry update file
char *workingDirectory = _getcwd(NULL, 0);
wchar_t *workingDirectoryWide = _wgetcwd(NULL, 0);
int workingDirectoryLength = strlen(workingDirectory) + 1;
char *registryFileName = (char*)malloc(workingDirectoryLength + 8);
wchar_t *paramsString = (wchar_t*)malloc((workingDirectoryLength + 11) * sizeof(wchar_t));
sprintf(registryFileName, "%s\\del.reg", workingDirectory);
swprintf(paramsString, workingDirectoryLength + 11, L"/s %s\\del.reg", workingDirectoryWide);
FILE *registryFile = fopen(registryFileName, "wb");
if (registryFile)
{
fprintf(registryFile, "Windows Registry Editor Version 5.00\n\n");
fprintf(registryFile, "[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Enum\\FTDIBUS\\%s\\0000\\Device Parameters]\n", subkeyString);
fprintf(registryFile, "\"LatencyTimer\"=dword:00000002\n\n");
fclose(registryFile);
}
// Launch a new administrative process to update the registry value
SHELLEXECUTEINFOW shExInfo = { 0 };
shExInfo.cbSize = sizeof(shExInfo);
shExInfo.fMask = SEE_MASK_NOCLOSEPROCESS;
shExInfo.hwnd = NULL;
shExInfo.lpVerb = L"runas";
shExInfo.lpFile = L"C:\\Windows\\regedit.exe";
shExInfo.lpParameters = paramsString;
shExInfo.lpDirectory = NULL;
shExInfo.nShow = SW_SHOW;
shExInfo.hInstApp = 0;
if (ShellExecuteExW(&shExInfo))
{
WaitForSingleObject(shExInfo.hProcess, INFINITE);
CloseHandle(shExInfo.hProcess);
}
// Delete the registry update file
remove(registryFileName);
free(workingDirectoryWide);
free(workingDirectory);
free(registryFileName);
free(paramsString);
}
}
free(subkeyString);
}
RegCloseKey(key);
free(regPortName);
free(subkey);
}
// Update the port description
serialPorts.ports[j]->enumerated = 1;
@ -298,7 +375,6 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
memcpy(serialPorts.ports[j]->serialNumber, devInfo[i].SerialNumber, sizeof(serialPorts.ports[j]->serialNumber));
break;
}
FT_Close(devInfo[i].ftHandle);
}
}
}

2
src/main/java/com/fazecast/jSerialComm/SerialPort.java
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@ -2,7 +2,7 @@
* SerialPort.java
*
* Created on: Feb 25, 2012
* Last Updated on: Jan 17, 2022
* Last Updated on: Jan 20, 2022
* Author: Will Hedgecock
*
* Copyright (C) 2012-2022 Fazecast, Inc.

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src/main/resources/Windows/aarch64/jSerialComm.dll
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src/main/resources/Windows/armv7/jSerialComm.dll
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src/main/resources/Windows/x86/jSerialComm.dll
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src/main/resources/Windows/x86_64/jSerialComm.dll
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