Post by thread:[PIC]pic 16c54 interface to max7219

part 1 602 bytes content-type:text/plain; (decoded quoted-printable) Hi I am building a little led scrolling sign. I am using a pic 16c54c interfaced to a max7219 by the three wire spi bus. The sign contains about 45 leds arranged in a pattern. My idea is to make each individual led come on to make the pattern appear to move or spell out a slogan Etc. I have some sample code that some one gave me a long time ago. I modified it and tried to use it for my purpose and havnt got very far with it. I have my attached sorce code and I hope someone guide me in the right direction with program here. thank you Mike Johnston part 2 4584 bytes content-type:application/octet-stream; (decode) part 3 35 bytes content-type:text/plain; charset="us-ascii" (decoded 7bit)

Here's 2 things found quickly: Your code needs this: org 0x1ff goto start ;power-up reset vector You initialized port a and portb but you have not initialized the option register yet. I did not go looking at the bigger routines (main....etc) since I hope that is what your problem was ;-) On April 8, 2005 07:45 pm, Michael Johnston wrote: {Quote hidden}> Hi > I am building a little led scrolling sign. I am using a pic 16c54c > interfaced to a max7219 by the three wire spi bus. The sign contains > about 45 leds arranged in a pattern. My idea is to make each > individual led come on to make the pattern appear to move or spell > out a slogan Etc. I have some sample code that some one gave me a > long time ago. I modified it and tried to use it for my purpose and > havnt got very far with it. I have my attached sorce code and I hope > someone guide me in the right direction with program here. > > thank you > Mike Johnston

Jose My eyes deceive me here a little, I thought that the option registor was intizalize in the include file and the reset vector was also in the include file. thanks Mike Johnston {Original Message removed}