WiCard PCInt (+Tutorial Video)

WiCard - Smart Programmable WiFi Controller Module

WiCard PCInt (+Tutorial Video)

wicard pcint feedback

WiCard PCInt (Pin Change Interrupt)

There are 22 lines of the pins available for the user to program. You can set 20 of these lines as logical input (GPI) and interrupt (PCInt). Also you can set 19 of them as logical output (GPIO).

PIN PortBit Rising Edge Interrupt Falling Edge Interrupt
A01 VCC 3.3v
A02 Ground
A03 0 * *
A04 1 * *
A05 2 * *
A06 3 * *
A07 4 * *
A08 5 * *
A09 6 * *
A10 7 * *
A11 16 * *
A12 17 * *
A13 18 * *
A14 19
A15 25
B01 24    
B02 23
B03 22 * *
B04 21 * *
B05 20 * *
B06 15 * *
B07 14 * *
B08 13 * *
B09 12 * *
B10 11 * *
B11 10 * *
B12 9
B13 8
B14 Ground
B15 VCC 3.3v

 

PC Interrupt Handler function

The system will call “PCIntHandler()” function when a PC interrupt occurs. Also you should clear the PC interrupt flags at the end of this function. Otherwise the interrupt of that pin will not call this function again.

Example:

PCIntHandler()
{
    ClearPCIntRaisingFlag(0xFFFFFFFF);
    ClearPCIntFallingFlag(0xFFFFFFFF);
}

 

Setting Pin As PCInt Raising Edge

To setting pins as PC interrupt, raising edge input, there is a PCI function. The “SetPinsAsPCIntRaising(uiArg)” function has a 32bit argument. The argument determines which PortBit should be set as PCInt raising input with logical “1”. Another port bits will remain unchanged. For example to setting the A03 pin (PortBit 0) as an PCInt raising input, the argument should be “0x00000001”, which the first bit in the argument is logical “1”. Then if the pin state changes from low level to the high level voltage, The WiCard module will call the “PCIntHandler()” function.

The “uiReadPCIntRaisingFlag()” function, returns a 32bit value of the PCInt raising flag. Port bits which have set as PCInt raising and their pin had been changed to the high level voltage, will be logical “1” in the return value.

Example:

main()
{
    SetPinsAsOutput(0x1);
    SetPinsAsPCIntRaising(0x2);
}

PCIntHandler()
{
    uiPCIntFlag = uiReadPCIntRaisingFlag();

    if(uiPCIntFlag&0x2)
        SetPortLatch(0x1);

    ClearPCIntRaisingFlag(0xFFFFFFFF);
}

Setting Pin As PCInt Falling Edge

To setting pins as PC interrupt, falling edge input, there is a PCI function. The “SetPinsAsPCIntFalling(uiArg)” function has a 32bit argument. The argument determines which PortBit should be set as PCInt falling input with logical “1”. Another port bits will remain unchanged. For example to setting the A03 pin (PortBit 0) as an PCInt falling input, the argument should be “0x00000001”, which the first bit in the argument is logical “1”. Then if the pin state changes from high level to the low level voltage, The WiCard module will call the “PCIntHandler()” function.

The “uiReadPCIntFallingFlag()” function, returns a 32bit value of the PCInt falling flag. Port bits which have set as PCInt falling and their pin had been changed to the low level of voltage, will be logical “1” in the return value.

Example:

main()
{
    SetPinsAsOutput(0x1);
    SetPortLatch(0x2); //Internal Pull Up Resistor
    SetPinsAsPCIntFalling(0x2);
}

PCIntHandler()
{
    uiPCIntFlag = uiReadPCIntFallingFlag();

    if(uiPCIntFlag&0x2)
        SetPortLatch(0x1);

    ClearPCIntFallingFlag(0xFFFFFFFF);
}

Tutorial Vido:

Here’s the tutorial video of PCInt and also how to use “One Bit Feedback” of simulator:

Here’s is the schematic in the video’s circuit.

wicard pcint

 

To downloading the plans, schematics and firmware, please refer to: https://trial.wicard.net

Also to finding out another stuff about WiCard WiFi Module, please refer to our home page and blog.

 

Leave a Reply

Your email address will not be published. Required fields are marked *

one × 1 =