I'm working on a project driving 12V strips with tpic6b595 and SPI at the moment, and its working. I can post example code later. But, right now, I can't see a problem in your code.
I'm working on a project driving 12V strips with tpic6b595 and SPI at the moment, and its working. I can post example code later. But, right now, I can't see a problem in your code.