FTDI LibFT4222 - GPIO Read Trigger Queue

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
68
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Supported Chip:
FT4222 chip version
Supported
FT4222 Rev A
YES
FT4222 Rev B
YES
FT4222 Rev C
YES
FT4222 Rev D
YES
Summary:
Get the size of trigger event queue.
Parameters:
ftHandle
Handle of the device.
portNum
One of the following GPIO port:
 GPIO_PORT0
 GPIO_PORT1
 GPIO_PORT2
 GPIO_PORT3
pQueueSize
Pointer to a variable of type unit16 where the returning value will be stored.
Return Value:
FT4222_OK if successful, otherwise the return value is an FT error code.
Error code:
FT4222_DEVICE_NOT_OPENED: The initialization API is not called.
FT4222_GPIO_NOT_SUPPORTED_IN_THIS_MODE: GPIO function is not supported in mode 2 and
mode 3
FT4222_INVALID_POINTER: Parameter pQueueSize is NULL.
Prerequisite:
FT4222_GPIO_Init
Example:
Please refer the example in FT4222_GPIO_ReadTriggerQueue.
3.8.6 GPIO Read Trigger Queue
FT4222_STATUS FT4222_GPIO_ReadTriggerQueue(FT_HANDLE ftHandle, GPIO_Port portNum,
GPIO_Trigger* events, uint16 readSize, uint16* sizeofRead)
Supported Chip:
FT4222 chip version
Supported
FT4222 Rev A
YES
FT4222 Rev B
YES
FT4222 Rev C
YES
FT4222 Rev D
YES
Summary:
Get events recorded in the trigger event queue. Trigger conditions are set by a call to
FT4222_GPIO_SetInputTrigger for a GPIO or FT4222_SetInterruptTrigger for an interrupt. After
calling this function, all events will be removed from the event queue.