| ??? 09/24/09 20:56 Modified: 09/24/09 20:59 Read: times |
#169109 - I think there's more to this than meets the eye Responding to: ???'s previous message |
... or possibly less.
Tony said: "
Hello Richard, I am working with Aduc812 from Phytec. It is an good idea using UART, but I have two slaves, so how could I say them both to start by UART? Maybe it could be possible to use the port 3.2. that is an interrupt to start the slaves, but how is it possible to give an extern out by master? That is the problem I have. Thx Walter." I believe there's been entirely too much discussion of an irrelvant problem. Doesn't Walter's statement say he wants to use his PC (or whatever the "master" is) serial port to command the two MCU's to start? Keep in mind that this is a PHYTEC board, and not just a chip. we don't know what buffering, or whatever, is available, since he didn't provide a model number. It would seem to me that if he drives both his slaves from his PC serial port, he can accomplish what he wants. The Master is presumably a PC, (I don't know where that notion comes from, but ... ) or, at least, a single processor with a single serial port. It's certainly OK for him to drive his serial output from his "master", whatever that is, to both of the "slaves" in parallel. Nowhere does he say he needs to send back any data ... or does he? Doesn't this redefine the problem? Have I missed something he's said? If he does send the serial signal to both slaves in parallel, they'll get the signal at the same time. If then, their RESET's and crystals were properly synchronized, they'll respond at exactly the same time. Otherwise, if the synchronization of the two slaves is critical, he'll need a different solution. This may not be as simple as it looks. RE |
