Thanks everyone for your help Andy, not quite sure what you mean " Does it do this even if you specify a high address (using ioaddr_hi in the config string)" - sorry. Is this in the .ini file?
Tom, I think I get the idea: For control of 5V (stepper drive opto-iso's) I'll connect 5V to +ve side and -ve side to 7i43 and set output to open-drain. I'll configure the driver to step on a falling edge and all should be good. Regards Andy -----Original Message----- From: Tom Easterday [mailto:[email protected]] Sent: 08 November 2010 22:56 To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] D510MO and MESA 7i43 On Nov 8, 2010, at 5:34 PM, Andy Ibbotson wrote: > > One small problem I have is how to get 5V output on the P3 / P4 pins. I can only get 3.3V at present - can anyone help with jumper settings please? > Regards > Andy Below is what Peter Wallace suggested to me when I wanted to drive some relays at 5v. This has worked fine for me, btw. -Tom > The 7I43 FPGA is a 3.3V device. Its outputs will only swing to 3.3V. What kind of relays are you driving? The 7I43 will only drive 24 mA maximum so its not suited to driving mechanical relays directly. > > If you have a 5V device (thats draws less than 24 mA) you need to drive, it is possible. > > What you do is this: > > 1. Jumper 7I43 for 5V tolerant I/O > > 2. Connect your load referred to 5V (load+ to 5V load- to 7I42) > This means the output will be active low (normally desirable so its off at > power up) > > 3. Set the output bit to open-drain mode ---------------------------------------------------------------------------- -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
