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Reduce latency timer in FTDI devices

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Javi Marina 2021-10-14 17:11:39 +02:00 committed by GitHub
parent 374323cd6e
commit 996201fe7a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 2 deletions
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11
src/main/c/Windows/SerialPort_Windows.c
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@ -2,10 +2,10 @@
* SerialPort_Windows.c * SerialPort_Windows.c
* *
* Created on: Feb 25, 2012 * Created on: Feb 25, 2012
* Last Updated on: Apr 01, 2020 * Last Updated on: Oct 14, 2021
* Author: Will Hedgecock * Author: Will Hedgecock
* *
* Copyright (C) 2012-2020 Fazecast, Inc. * Copyright (C) 2012-2021 Fazecast, Inc.
* *
* This file is part of jSerialComm. * This file is part of jSerialComm.
* *
@ -69,6 +69,7 @@ jfieldID eventFlagsField;
typedef int (__stdcall *FT_CreateDeviceInfoListFunction)(LPDWORD); typedef int (__stdcall *FT_CreateDeviceInfoListFunction)(LPDWORD);
typedef int (__stdcall *FT_GetDeviceInfoListFunction)(FT_DEVICE_LIST_INFO_NODE*, LPDWORD); typedef int (__stdcall *FT_GetDeviceInfoListFunction)(FT_DEVICE_LIST_INFO_NODE*, LPDWORD);
typedef int (__stdcall *FT_GetComPortNumberFunction)(FT_HANDLE, LPLONG); 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_OpenFunction)(int, FT_HANDLE*);
typedef int (__stdcall *FT_CloseFunction)(FT_HANDLE); typedef int (__stdcall *FT_CloseFunction)(FT_HANDLE);
@ -277,6 +278,7 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
FT_GetComPortNumberFunction FT_GetComPortNumber = (FT_GetComPortNumberFunction)GetProcAddress(ftdiLibInstance, "FT_GetComPortNumber"); FT_GetComPortNumberFunction FT_GetComPortNumber = (FT_GetComPortNumberFunction)GetProcAddress(ftdiLibInstance, "FT_GetComPortNumber");
FT_OpenFunction FT_Open = (FT_OpenFunction)GetProcAddress(ftdiLibInstance, "FT_Open"); FT_OpenFunction FT_Open = (FT_OpenFunction)GetProcAddress(ftdiLibInstance, "FT_Open");
FT_CloseFunction FT_Close = (FT_CloseFunction)GetProcAddress(ftdiLibInstance, "FT_Close"); FT_CloseFunction FT_Close = (FT_CloseFunction)GetProcAddress(ftdiLibInstance, "FT_Close");
FT_SetLatencyTimerFunction FT_SetLatencyTimer = (FT_SetLatencyTimerFunction)GetProcAddress(ftdiLibInstance, "FT_SetLatencyTimer");
if ((FT_CreateDeviceInfoList != NULL) && (FT_GetDeviceInfoList != NULL) && (FT_GetComPortNumber != NULL) && (FT_Open != NULL) && (FT_Close != NULL)) if ((FT_CreateDeviceInfoList != NULL) && (FT_GetDeviceInfoList != NULL) && (FT_GetComPortNumber != NULL) && (FT_Open != NULL) && (FT_Close != NULL))
{ {
DWORD numDevs; DWORD numDevs;
@ -292,6 +294,11 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
LONG comPortNumber = 0; LONG comPortNumber = 0;
if ((FT_Open(i, &devInfo[i].ftHandle) == FT_OK) && (FT_GetComPortNumber(devInfo[i].ftHandle, &comPortNumber) == FT_OK)) if ((FT_Open(i, &devInfo[i].ftHandle) == FT_OK) && (FT_GetComPortNumber(devInfo[i].ftHandle, &comPortNumber) == FT_OK))
{ {
if (FT_SetLatencyTimer != NULL)
{
// Reduce latency timer
FT_SetLatencyTimer(devInfo[i].ftHandle, 2); // Minimum value is 2. Ignore errors
}
// Update port description if COM port is actually connected and present in the port list // Update port description if COM port is actually connected and present in the port list
FT_Close(devInfo[i].ftHandle); FT_Close(devInfo[i].ftHandle);
swprintf(comPortString, sizeof(comPortString) / sizeof(wchar_t), L"COM%ld", comPortNumber); swprintf(comPortString, sizeof(comPortString) / sizeof(wchar_t), L"COM%ld", comPortNumber);