====== Set Pad ======

''Set Pad mode, packetSize, bufferSize''
| //mode // |Bit mode (0 to 255)  |
| //packetSize// | Packet size (1 to 255)  | 
| //bufferSize // | Receive buffer size (1 to 255)  |

The Cubloc has a dedicated port for keypad / touchpad inputs similar to a
PC’s keyboard or mouse port. This port can be used with the Set Pad
command to create interrupts when input is received on a keypad,
touchpad, etc.,. This port is as an SPI slave.

To use pad communication, you must use a Set Pad command at the
beginning of your program. Pad communication uses 4 wires. SCK is used
as the clock signal, SS as the slave select, MOSI as the master out/slave in,
and MISO as master in/slave out.

{{ :cubloc:set_pad:setpad.png?nolink |}}

I/O ports P0 through P3 can be used for pad communication.

{{ :cubloc:set_pad:setpad2.png?nolink |}}

{{ :cubloc:set_pad:setpad3.png?nolink |}}

===== packetSize =====

The ''packetSize'' parameter sets the packet size needed to cause an interrupt.
For example, the Cutouch panel requires 4 bytes to be received before an
interrupt is generated.

===== bufferSize =====

The ''bufferSize'' parameter is the total size of the receive buffer. The buffer
size must be at least 1 more than the packet size. A larger buffer will
essentially give you more time to process the interrupt service routine. The
buffer size is usually set to 5 or 10 times the packet size.

===== Mode =====

The ''mode'' parameter will set the receiving mode of the received data.
Please refer to the following table:

{{ :cubloc:set_pad:setpadtable.png?nolink |}}

The receiving modes can be combined. For example, for MSB first,
High-Edge Triggered SCK, and sampling after SCK:


    0x00 + 0x00 + 0x04 = 0x04

Here are some common examples:

{{ :cubloc:set_pad:setpadsignal.png?nolink |}}

For pad communications, you can use Comfile’s keypads and touch screens.

The Set Pad command will automatically set the I/O mode of ports P0
through P3; the user doesn’t have to set them.


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