TLC5940 output pin state

Other Hardware LEDs and Multiplexing
1

Dear friend,

I am using TLC5940 with arduino to control dozens of LEDs, everything seems to work as it should.

I am just having problem with determining what is the state of output pin(s) on TLC5940.
I was going through the paper "Demystifying the TLC5940" and I have found something like this:

#define outputState(port, pin) ((port) & (1 << (pin)))

but I am not able to make it work on output pins.

Thanks for any response!

2

Got a link to the paper?
I would expect a command like that to set an Arduino output such as PORTD bit 3 to a high state.
Don't think it would do anything for the TLC5940, which needs I think 12 bits of data per output pin to set its PWM level.