MCP2200
2.3.1.19
ReadPinValue
Function:
int SimpleIOClass::ReadPinValue(unsigned int pin)
Summary:
Reads the specified pin.
Description:
Reads the specified pin and returns the value as the return value. If the pin has been configured as a
digital input, the return value will be either ‘0’ or ‘1’. If an error occurs, the function will return a value
of 0x8000.
Precondition: Must be previously configured as an input via a ConfigureIOcall.
VID and PID must be previously set via a call to InitMCP2200(VID, PID).
Parameters:
Returns:
pin- the pin number to set (0-7)
This function returns the read value of the pin, or returns a value of 0x8000, if an error occurs.
None.
Remarks:
EXAMPLE 2-19:
unsigned int rv;
if (SimpleIOClass::ReadPinValue(0) != 0x8000)
{
lblStatusBar->Text = “Success”;
}
else
lblStatusBar->Text = “Invalid command ” + SimpleIOClass::LastError;
2.3.1.20
Function:
ReadPort
bool SimpleIOClass::ReadPort(unsigned int *returnvalue)
Summary:
Reads the GPIO port as digital input.
Description:
Reads the GPIO port and returns the value in returnvalue. This provides a means to read all pins
simultaneously, instead of one-by-one.
Precondition: Must be previously configured as an input via a ConfigureIOcall.
VID and PID must be previously set via a call to InitMCP2200(VID, PID).
Parameters:
• pin- the pin number to set (0-7)
• returnvalue- the value read on the pin (‘0’ or ‘1’)
Returns:
This function returns True if the transmission is successful and returns False if the transmission fails.
Pins configured for output return the current state of the port. Pins configured as input read as zero.
Remarks:
EXAMPLE 2-20:
unsigned int rv;
if (SimpleIOClass::ReadGPIOPort (0, &rv))
{
lblStatusBar->Text = “Success”;
}
else
lblStatusBar->Text = “Invalid command ” + SimpleIOClass::LastError;
DS22228B-page 20
2011 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
