Ok, So I think I should be able to use a couple of MCP23S17 chips to interface the MSP-430FR5994 Launchpad to my existing boards. The layout is almost identical to the 6821 PIA chips originally used. So I have the switch Strobes on GPA0-6, Switch Returns on GPB0-7 Then I have the Lamp Addressing on GPA0-3, and the Lamp Data on GPA4-7 My next problem is trying to figure out trying to figure out how the CA1 and CA2 worked on the old 6821 PIA, and how to duplicate that, as it's used for the Lamp Strobe, and is also used on the 7 digit Display interrupt, and display strobes. Can someone point me in the right direction on some reading material or explain how I might handle these signals? I've included a rough schematic of what I'm trying to do. If you would like a better version of it, or the Eagle Cad SCH file let me know. Thanks, Kevin
↧