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USB-CANmodul
UcanReadUserPortEx
Syntax:
UCANRET PUBLIC UcanReadUserPortEx (
tUcanHandle
UcanHandle_p,
BYTE*
pbInValue_p,
BYTE*
pbLastOutEn_p,
BYTE*
pbLastOutVal_p);
Usability:
HW_INIT, CAN_INIT , version 3.00 and higher
Description:
Reads the current input value from the expansion port. This function may be used
alternatively for function UcanReadUserPort().
Parameter:
UcanHandle_p:
USB-CAN
handle
received
with
the
UcanInitHardware() or UcanInitHardwareEx().
pbInValue_p:
Address pointing to a variable that contains the read input
value following the successful return of this function. This
variable then contains the state of the 8-bit expansion port.
Each bit in this parameter corresponds to matching pin on
the expansion port.
pbLastOutEn_p:
Address pointing to a variable that contains the configuration
data following the successful return of this function
(configuration that was previously done with
UcanConfigUserPort()). This parameter may be NULL.
pbLastOutVal_p:
Address pointing to a variable that contains the last output
value following the successful return of this function. (output
value that was written with UcanWriteUserPort()).This
parameter may be NULL.
Return value:
function
Error code of the function.
USBCAN_SUCCESSFUL
USBCAN_ERR_MAXINSTANCES
USBCAN_ERR_ILLHANDLE
USBCAN_ERR_BUSY
USBCAN_ERR_IOFAILED
USBCAN_ERR_ILLHW
USBCAN_ERR_ILLPARAM
USBCAN_ERR_DATA
USBCAN_ERR_ABORT
USBCAN_ERR_DISCONNECT
USBCAN_ERR_TIMEOUT
USBCAN_ERRCMD_…
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