EXP_IO.C   Example to expand number of I/O using 74165 & 74595 ///////////////////////////////////////////////////////////////////////// //// EX_EXPIO.C //// //// //// //// This program shows how to use the 74165.C and 74595.C //// //// libraries for extended input and output. //// //// //// //// When button S1 is pushed, LED 1 will toggle green. Button //// //// S2 will toggle LED 2. However, when both buttons are pushed, //// //// LED 3 will toggle green. //// //// //// //// (C) Copyright 1996,1997 Custom Computer Services //// //// //// ////////////////////////////////////////////////////////////////////////// #ifdef __PCB__ #include <16C56.H> #else #include <16C74.H> #endif #include <74595.C> #include <74165.C> main() { byte data; do { read_expanded_inputs (&data); data |= 0xF8; //Force the unused input bits on data -= (!(data&0x01)&!(data&0x02))<<2; //Turn on bit 2 it both inputs are //toggled write_expanded_outputs (&data); } while (TRUE); }

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