User`s manual

BL4S100 User’s Manual 42

• PPM_QUADRATURE_DECODER.C—Demonstrates the use of two PWM and two PPM

output channels connected back to four digital inputs to simulate two Quadrature

Decoders feeding signals into the BL4S100. The PWM and PPM outputs are adjusted

through a menu system to simulate the movement of a Quadrature Decoder. The results

of the Quadrature Decoder inputs are displayed continuously to show the effects of the

PWM and PPM outputs.

The high-speed Quadrature Decoder counts the number of

rollovers that occur (one per 1000 counts). The low-speed

Quadrature Decoder displays the current count in the

Once the connections are made as shown, and you compile

and run this sample program, change the frequency/

direction for a given Quadrature Decoder via the Dynamic C

STDIO window and watch the register counts on the low-

speed channel and the register rollovers on the high-speed

channel.

OUT2 OUT1 OUT0 IN3 IN2 IN1 IN0 +K GND

IN11 IN10 IN9 IN8 IN7 IN6 IN5 IN4 GND

+5 V +K2 +K1 GND OUT7 OUT6 OUT5 OUT4 OUT3

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