| ??? 02/08/05 13:53 Read: times |
#86901 - questions Responding to: ???'s previous message |
I then tried sending FFH, and lo and behold the '51 receives 5FH. Seems obvious so far - my D7 and D5 lines between the UART and the '51 are bad..... a) except if I try it with my MetaIce emulator I get the correct data to the '51. b)If I try it with a prototype PCB (but the same layout) I get the correct data. c)When I'm not using the emulator I know that the data is wrong because I'm echoing it back to the PC. I'm pretty sure it's arriving at the '51 incorrectly because I'm doing a comparison in the '51 which fails
a) so you receive to the emulator, do you transmit correct? b) with the same chip as the malfunctioning board? c) that could be both receive and transmit. b) of course, is only possible if the chip is socketed. Erik |
| Topic | Author | Date |
| Odd UART problem. | 01/01/70 00:00 | |
| Parity enabled? | 01/01/70 00:00 | |
| Understood.... | 01/01/70 00:00 | |
| questions | 01/01/70 00:00 | |
| In reply to Erik | 01/01/70 00:00 | |
| time for the ol' scope | 01/01/70 00:00 | |
| Can I borrow yours? | 01/01/70 00:00 | |
| re: bad data | 01/01/70 00:00 | |
| re: bad data | 01/01/70 00:00 | |
| Good idea | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| bad/worn out socket? | 01/01/70 00:00 | |
| emulator vs chip - experience | 01/01/70 00:00 | |
| re:emulator vs chip - experience | 01/01/70 00:00 | |
| Baud rate | 01/01/70 00:00 | |
| Ah, good info! | 01/01/70 00:00 | |
| can you | 01/01/70 00:00 | |
| re: bad data | 01/01/70 00:00 | |
| Which data does that loop? | 01/01/70 00:00 | |
| re:Which data does that loop? | 01/01/70 00:00 | |
| Update | 01/01/70 00:00 | |
| re: update | 01/01/70 00:00 | |
| GND connection? | 01/01/70 00:00 | |
Meters OK | 01/01/70 00:00 |