| ??? 03/26/09 18:00 Read: times |
#163876 - Autobaud - the other end... |
Usually, questions about "Autobaud" (or Automatic Baud Rate Detection, ABRD) refer to a device that needs to accept input at "any" (within reason) baud rate.
I'm now thinking of doing this "the other way around" - ie, a controller that needs to send commands to another device, when the baud rate of that device is not known in advance. Specifically, the case where a modem is connected to a microcontroller, but the microcontroller doesn't know the modem's baud rate in advance. Google doesn't help much, as anything useful just gets lost in what is, for this case, just "noise" about doing it the "normal" way. My basic approach would be to just send "AT" at various speeds until I get a proper "OK" response. But are there any cunning tricks that could speed the process? eg, I guess I should start at the microcontroller's "preferred" speed - in case the modem itself is autobauding! Any other thoughts? |
| Topic | Author | Date |
| Autobaud - the other end... | 01/01/70 00:00 | |
| Doh | 01/01/70 00:00 | |
| Eh? | 01/01/70 00:00 | |
| Homing in | 01/01/70 00:00 | |
| Considerations | 01/01/70 00:00 | |
| How does it respond to AT? | 01/01/70 00:00 | |
| The proper response to "AT" is "OK" | 01/01/70 00:00 | |
| no absolutely perfect solution | 01/01/70 00:00 | |
| Character time | 01/01/70 00:00 | |
| Go for KISS | 01/01/70 00:00 | |
| only be needed once after a modem change. | 01/01/70 00:00 | |
| Some ARM7's have Autobaud detect | 01/01/70 00:00 | |
| No - the *other* end! | 01/01/70 00:00 | |
| Fall back and forward | 01/01/70 00:00 | |
| Only interested in local DTE-DCE speed | 01/01/70 00:00 | |
| You were clear | 01/01/70 00:00 | |
| Start slow, or start fast...? | 01/01/70 00:00 | |
| Unnecessarily high? | 01/01/70 00:00 | |
| High baudrate = bursty | 01/01/70 00:00 | |
| Throughtput | 01/01/70 00:00 | |
| Keep Up? | 01/01/70 00:00 | |
Keeping up always hard at high baudrates | 01/01/70 00:00 | |
| KISS? | 01/01/70 00:00 | |
| A Cunning Plan... | 01/01/70 00:00 | |
| Timing | 01/01/70 00:00 |