AioGetCntStatus

Function

Retrieves the counter status.

Format

Ret = AioGetCntStatus ( Id , CntChannel , CntStatus )

Parameters

Id [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the ID retrieved from AioInit.

CntChannel [ C, C++ : short ] [ Python : ctypes.c_short ]
Sets the channel of counter.

CntStatus [ C, C++ : long * ] [ Python : ctypes.POINTER(ctypes.c_long) ]
Specifies the address of the variable that stores the status.
CntStatus has the following meanings in bit

Status	Macro	Value
Counter in operation	CNTS_BUSY	00000001H
Comparison count match	CNTS_DATA_NUM	00000010H
Overrun	CNTS_ORERR	00010000H
Counter operation error	CNTS_ERR	00020000H

Return values

Ret [ C, C++ : long ] [ Python : ctypes.c_long ]

Return values	Content
0	Normality completion
7	Execute AioResetDevice function because the device has recovered from standby mode
10001	Invalid Id was specified Use the Id retrieved from AioInit to specify the Id in this function.
10002	AIO driver can't be called At first, perform AioInit function.
15200	The value of CntChannel is outside the designated range of the function
15201	Pointer to CntStatus is NULL Specify the address of variable to parameter.
20001	This function can't be used by this device
20003	Can not use because another process is using the device When another process is using the device, all functions except for those that support multi-process can not be performed.
25200	The value of CntChannel is outside the designated range of the device being used

Initial values

CntStatus = 0 for all devices

Remarks

After the action of counter was started, its status becomes ON when the comparison count match occurs.
The status is set back to OFF by performing the function AioResetCntStatus.

If the status of comparison count match is in ON, the overrun status becomes ON when the comparison count match occurs again.
The status is set back to OFF by performing the function AioResetCntStatus.
Even if the overrun status changes to ON, the counter operation isn't stopped.

If comparison count match occurs one after another in short time, the driver cannot process them in time.
In this case, the status of counter operation error changes to ON, the counter operation stops.

This function cannot be used on devices without counter functionality.
Even if the device is in operation, the function can be performed.

Example

Retrieves the counter status for channel 0.

C, C++	long Ret; long CntStatus; Ret = AioGetCntStatus ( Id , 0 , &CntStatus );
Python	Ret = ctypes.c_long() CntStatus = ctypes.c_long() Ret.value = caio.AioGetCntStatus ( Id , 0 , ctypes.byref(CntStatus) )