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2011 Microchip Technology Inc. DS22228B-page 19
MCP2200
EXAMPLE 2-16:
2.3.1.17 ReadEEPROM
Function:
int SimpleIOClass::ReadEEPROM (unsigned int uiEEPAddress)
EXAMPLE 2-17:
2.3.1.18 ReadPin
Function:
bool SimpleIOClass::ReadPin (unsigned int pin, unsigned int *returnvalue)
EXAMPLE 2-18:
Summary: Reads a byte from the EEPROM.
Description: Reads a byte from the EEPROM at the given address.
Precondition: At least one call to the
InitMCP2200() is required in order to initiate a DLL search for the compatible
devices. VID and PID must be previously set via a call to
InitMCP2200(VID, PID).
Parameters:
uiEEPAddress - the EEPROM address location we need to write to (must be from 0 to 255, inclu-
sively).
Returns: This function returns any positive value as being the EEPROM’s location value:
•
E_WRONG_ADDRESS (-3) - in case the given EEPROM address is out of range
• E_CANNOT_SEND_DATA (-4) - in case the function cannot send the command to the device
Remarks: None.
Summary: Reads the specified pin.
Description: Reads the specified pin and returns the value in returnvalue. If the pin has been configured as a
digital input, the return value will be either ‘
0’ or ‘1’.
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: None.
unsigned int rv;
if (SimpleIOClass::IsConnected ())
{
lblStatusBar->Text = “Device connected”;
}
else
lblStatusBar->Text = “Device Disconnected”;
int iRetValue = SimpleIOClass::ReadEEPROM(0x01);
if (iRetValue >= 0)
{
lblStatusBar->Text = “Success”;
}
else
lblStatusBar->Text = “Error reading to EEPROM” + SimpleIOClass::LastError;