Shift register function

Page last updated 26 Dec 2009, by Chris Crocker-White. 0 replies

For some reason the code formatter isn't working...

void shiftOut(DigitalOut ds, DigitalOut sh, DigitalOut st, int sodata) {
int i;

// set store low (ready to move to o/p register onchange to high
st = 0;

// byte must be output msb to lsb
for (i=7;i>=0;i--) {
sh = 0;

if (sodata & (1<<i)) {
ds = 1;
} else {
ds = 0;
}

sh = 1;
ds = 0;
}

// move the shifted byte to the output register (appears on output pins)
st = 1;
return;
}

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