How to send a bit pattern via serial/parallel port??

[Aigneryu]

shift out parallel port

I've got a chip to test but its control interface is mainly composed shift registers. And I have to access the ports in order to input the specific bit streams.

First problem is that the signal level is not proper for direct input to my chip. And the second problem is that I don't know how to control these ports. In fact, I need a serial control bit stream aligned with a clock for shift registers.

Do anybody know where can I find some useful material for programming?? An example or reference books.

 

[sunjimmy]

Hi,

The following books may help;

1.Programming the parallel port
by GRADE R&D Books inc
ISBN: 0-87930-513-4

2.Serial Communication: Developer guide
2nd Ed. by Nelson IDG Books inc
ISBN: 0-7645-4570-1

 

[stanleysan]

first problem maybe solved by some level conver ic(hc244...)
second problem ,you can use microcontroller's timer out pin .

 

[artem]

You can use the register logic with parallel loading and strobe it by freq from your shift registers to shift out values you loaded into . If parllel loading is done through
LPT port you can change the bit stream you are outputing very easy . I do not remember the logic id , but it can be easely found