MCP2200T-ISLASHSS datasheet(20/44 Pages) MICROCHIP

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MCP2200

DS20002228C-page 20

 2011-2015 Microchip Technology Inc.

2.3.1.19

ReadPinValue

Function:

int SimpleIOClass::ReadPinValue(unsigned int pin)

EXAMPLE 2-19:

2.3.1.20

ReadPort

Function:

bool SimpleIOClass::ReadPort(unsigned int *returnvalue)

EXAMPLE 2-20:

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 ConfigureIO call.

VID and PID must be previously set via a call to InitMCP2200(VID, PID).

Parameters:

- the pin number to set (0-7)

Returns:

This function returns the read value of the pin, or returns a value of 0x8000, if an error occurs.

Remarks:

None.

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 ConfigureIO call.

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.

Remarks:

Pins configured for output return the current state of the port. Pins configured as input read as zero.

unsigned int rv;

if (SimpleIOClass::ReadPinValue(0) != 0x8000)

{

lblStatusBar->Text = “Success”;

}

else

lblStatusBar->Text = “Invalid command ” +

SimpleIOClass::LastError;

unsigned int rv;

if (SimpleIOClass::ReadGPIOPort (0, &rv))

{

lblStatusBar->Text = “Success”;

}

else

lblStatusBar->Text = “Invalid command ” +

SimpleIOClass::LastError;

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