Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 254)

daqIOGet8255Conf
Also See: daqIORead, daqIOReadBit,
daqIOWrite, daqIOWriteBit, daqSetOption
Format
daqIOGet8255Conf(handle, portA, portB, portCHigh, portCLow, config)
Purpose
daqIOGet8255Conf sets and retrieves the configuration for the specified 8255 device with the specified port
configurations.
Parameter Summary
Parameter Type Description
handle DaqHandleT Handle to the device
portA BOOL 8255 port A value
portB BOOL 8255 port B value
portCHigh BOOL
8255 port C high nibble value
portCLow BOOL 8255 port C low nibble value
config PDWORD Pointer to a value representing the 8255’s current configuration
Parameter Values
handle: obtained from the daqOpen function
portA: valid values are either true (
≠ 0) or false ( = 0)
portB: valid values are either true (
≠ 0) or false ( = 0)
partCHigh: valid values are either true (
≠ 0) or false ( = 0)
portCLow: valid values are either true (
≠ 0) or false ( = 0)
config: a pointer to the configuration value ranging from 0 to 65,535
Returns
DaqError See Daq Error Table
For more details on error messages refer to the Daq Error Table.
Function Usage
The configuration is returned in the config parameter and will indicate the current configuration of the 8255. This
configuration must then be written to the control register of the desired 8255 with the daqIOWrite function.
When set to true, the portA, portB, portCHigh and portCLow flags will configure the respective port as an
input port. If the flag is set to false, the port will be configured as an output.
daqSetOption will work for single byte use.
4.5-24 Daq API Command Reference
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Programmer’s Manual