CS 273

Homework 7

Due Friday, April 13, 2001

Write a driver for the digital inputs. It should have the following API

Synopsis

signed char digital(unsigned char bitno);

Parameter

Valid values are 1 through 8. Specifies which of the digital input bits to read (there is no equivalent of the broadcast value used for the motor driver).

Return value

Return -1 on out-of-range input. Otherwise return 0 if the bit is 0, and 1 if it is non-zero.