| ??? 05/29/10 12:18 Read: times |
#176294 - what is "other code" ? Responding to: ???'s previous message |
At the beginning of the loop I can't be sure what state everything is in, and other code may have been using the RS485 bus.
turn driver off and receiver on, because I'm not sure what state it's been left in wait a moment for bus settling etc. so far so good BUT: WHAT DOES "other code" MEAN? are you using a RTOS? do I need to read SBUF to make sure the chip is ready to receive the next byte? no do I need to clear RI here in case something has been received when I switched the receiver off and on again or by "other code"? it would have vectored to your ISR if it was jnb RI,$ clr RI mov a,SBUF wait half a bit-time plus a moment for settling turn driver on and receiver off wait a moment for settling do I need to clear TI here, just to be sure? mov SBUF,a jnb TI,$ clr TI wait 1 bit-time plus a moment more for bus settling etc. turn driver off and receiver on wait a moment for bus settling etc. all in the ISR "other code" which may receive and/or transmit via the RS485 port what is "other code" ? Yes, I know that the best way to do it is with interrupts! I will move on to that when I've got this working perfectly... do not wait, do it NOW Erik |
| Topic | Author | Date |
| Receiving serial bytes on 80C320 UART | 01/01/70 00:00 | |
| here | 01/01/70 00:00 | |
| Thanks - excellent FAQ | 01/01/70 00:00 | |
| "bible time" | 01/01/70 00:00 | |
| Truly biblical! | 01/01/70 00:00 | |
| My recommendation... | 01/01/70 00:00 | |
| Useful ideas - but I don't want to change the hardware | 01/01/70 00:00 | |
| You are absolutotally unconditionally confused | 01/01/70 00:00 | |
| !RI or /RE | 01/01/70 00:00 | |
| I'll re-answer the post above | 01/01/70 00:00 | |
| Use previous advice and keep receiver enabled | 01/01/70 00:00 | |
| This can't be right... | 01/01/70 00:00 | |
| How to get it working | 01/01/70 00:00 | |
| sometimes right, sometimes wrong | 01/01/70 00:00 | |
| e-mailed to Steve, Craig --- forum FYI | 01/01/70 00:00 | |
| We're getting there... | 01/01/70 00:00 | |
| I believe you are corect.... | 01/01/70 00:00 | |
| join the club | 01/01/70 00:00 | |
| "No other way??" | 01/01/70 00:00 | |
in my (personal) opinion | 01/01/70 00:00 | |
| what is "other code" ? | 01/01/70 00:00 |