??? 10/11/04 16:03 Read: times |
#79147 - RE: RATING SYSTEM Responding to: ???'s previous message |
Prahlad J. Purohit wrote:
"If one uses a better derivate say P89V51RD2 running at 40MHz in 6 cyle mode some other derivate in single cycle mode I don't think 10 devices in software bit banged UART are a problem." I wouldn't want to keep track of ten separate, uncorrelated devices and bit-bang them. "I never said my scheme will cater to all 10 devices simultaneously I have kept saying one device at a time and other devices on hold by handshaking signal." I suspect that Ravi's application might not support that. "The PC soft must be special and you can't use the standard programs like i.e. flip or others. " Exactly -- and it's fairly common that the host software is thought to be trivial, when it's usually the hardest part of the process. Either you write a special device driver that makes your board look to windows like ten separate COM: devices (and so can be used by Hyperterminal or some such standard app), or you write a custom app. Either way, it'll take longer (and cost more $$$ in development) than buying a couple of quad-port (or an 8-port) serial card, or a terminal server. -a |