private void write4bits(byte value)
{
UInt16 registerValue;
registerValue = MCP.readGPIOAB();
// speed up for i2c since its sluggish
for (int i = 0; i < 4; i++)
{
registerValue &= (UInt16) ~(1 << DataPins[i]);
registerValue |= (UInt16)(((value >> i) & 0x1) << DataPins[i]);
}
// make sure enable is low
registerValue &= (UInt16) ~(1 << EnablePin);
MCP.writeGPIOAB(registerValue);
pulseEnable();
}
