FTDI LibFT4222 - Page 18

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
17
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{
BOOL value;
WaitForSingleObject(hRxEvent,INFINITE);
// FT4222_GPIO_Read is a read clear function for interrupt
if(FT4222_GPIO_Read(ftHandle, (GPIO_Port)GPIO_PORT3, &value) == FT4222_OK)
{
if(value == TRUE)
{
// got interrupt
}
else
{
// no interrupt
}
}
}
FT4222_UnInitialize(ftHandle);
FT_Close(ftHandle);
// example 2: This test code is running in Mode 0.
// Monitor how many interrupts happen in a period of time.
FT_HANDLE ftHandle = NULL;
FT_STATUS ftStatus;
FT4222_STATUS ft4222Status;
ftStatus = FT_OpenEx("FT4222 B",FT_OPEN_BY_DESCRIPTION, &ftHandle);
if (FT_OK != ftStatus)
{
// open failed
return;
}
GPIO_Dir gpioDir[4];
gpioDir[0] = GPIO_OUTPUT;
gpioDir[1] = GPIO_OUTPUT;
gpioDir[2] = GPIO_OUTPUT;
gpioDir[3] = GPIO_INPUT;
// we must initial gpio before FT4222_SetInterruptTrigger, because interrupt data is transmitted
by gpio interface.
FT4222_GPIO_Init(ftHandle, gpioDir);
// enable interrupt
FT4222_SetWakeUpInterrupt(ftHandle, true);
// setup interrupt trigger level
FT4222_SetInterruptTrigger(ftHandle, GPIO_TRIGGER_RISING);
while(1)
{
uint16 queueSize;
// sleep 1s
Sleep(1000);
if(FT4222_GPIO_GetTriggerStatus(ftHandle, GPIO_PORT3, &queueSize) == FT4222_OK)
{
// got interrupt times in 1s
if(queueSize > 0)
{
BOOL value;
// clear the interrupt result
FT4222_GPIO_Read(ftHandle, (GPIO_Port)GPIO_PORT3, &value);