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K EE L OQ? 3 DEVELOPMENT KIT
USER ’S GUIDE
Chapter 6. K EE L OQ? Development Kit Controller Firmware
6.1
6.2
INTRODUCTION
The controller is the heart of the K EE L OQ? 3 Development kit. It is the receiving side of
the K EE L OQ system. In order for the system to respond to incoming radio transmission
from one of the K EE L OQ transmitters, the controller must have information about the
respective transmitters.
Such information includes the serial number and the synchronization counter. Both are
very important pieces of information and present the root of the K EE L OQ decoding. The
learning procedure in explained in Section 5.5 “Learning a Transmitter to the
Controller ” .
HIGHLIGHTS
This chapter discusses:
?
?
?
?
Overview of the firmware running on the controller
Data packet receiving
K EE L OQ Decryption
I 2 C? communication
6.3
K EE L OQ DATA PACKET RECEIVING
The data packet section of the controller firmware receives and decodes PWM
modulated K EE L OQ transmissions. This routine only checks for and decodes K EE L OQ
transmissions coming from the radio receiver module.
PWM Format
In general, all K EE L OQ encoders share a common transmission format:
? A preamble to improve biasing of decision thresholds in super-regenerative
receivers. The preamble consists of alternate on and off periods, each lasting as
long as a single elemental period.
? A calibration header consisting of a low period of 10 elemental periods.
Calibration actions should be performed on the low period of the header to ensure
correct operation with header chopping.
? A string of pulse-width modulated bits, each consisting of three elements. The first
element is high, the second contains the data transmitted and is either high or low,
and the third element is always low.
? A guard period is usually left between the transmissions. During this period
nothing is transmitted by the encoder.
? 2009 Microchip Technology Inc.
DS41378A-page 33
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