Read Modify Write problem?

[markedwards]

Thanks Darrel,

Is this what you meant?
Variable X0 is the segment pattern and is sent to the output ports.
TRISB. I use OR to maintain portB.1 as input
TRISA. I use OR to maintain PortA.2 and PortA.3 as inputs
Is there an better approach?



'initialize ports
TRISA = %00001100 'configure port A outputs = 0
TRISB = %00000010 'configure port B outputs = 0

Thanks,

Mark

'write segments to ports A and B
PORTB.0 = X0.0 ' Send segments to LED 0 = ON
PORTA.4 = X0.1
PORTA.6 = X0.2
PORTB.3 = X0.3
PORTB.4 = X0.4
PORTB.5 = X0.5
PORTB.6 = X0.6
PORTB.7 = X0.7

TRISB = X0 OR %00000010 ' OFF segments = 1 (set to inputs)
X1=X0 AND %01010000 ' isolate X1= PortA.4 and PortA.6 bits
TRISA = X1 OR %00001100 'maintain PortA.2 and PortA.3 inputs

[Darrel Taylor]

uh, nope.

I was thinking something more like this.

PORTA = 0
PORTB = 0

'write segments to ports A and B
TRISB.0 = X0.0 ' Send segments to LED 0 = ON
TRISA.4 = X0.1
TRISA.6 = X0.2
TRISB.3 = X0.3
TRISB.4 = X0.4
TRISB.5 = X0.5
TRISB.6 = X0.6
TRISB.7 = X0.7
<br>

[markedwards]

Thanks Darrel,

That is much cleaner! I will give it a try.

Mark