| ??? 09/08/09 07:31 Read: times |
#168795 - Looks like short between D0 and GND Responding to: ???'s previous message |
I agree with Jan. You should look for D0 being low if you get 0x64 ('d') for 0x65 ('e'). It is either an open circuit D0 if the HD44780 has internal pull-downs or a short to GND.
The initialisation is fairly trivial for 8-bit i/f because it is the default. But you still have to obey the data sheet timing constraints. David. |
| Topic | Author | Date |
| hd44780 16x2 lcd some letters display as other letters | 01/01/70 00:00 | |
| How fast is your 8051? | 01/01/70 00:00 | |
| speed | 01/01/70 00:00 | |
| incomplete init, or some hardware issue | 01/01/70 00:00 | |
| Looks like short between D0 and GND | 01/01/70 00:00 | |
| Pullup on D0 P0 | 01/01/70 00:00 | |
| Debug Tip: Always look for patterns! | 01/01/70 00:00 | |
| Oscilloscope | 01/01/70 00:00 | |
| will check D0 | 01/01/70 00:00 | |
| It could simply be open ... | 01/01/70 00:00 | |
| the analysis is fine... | 01/01/70 00:00 | |
It's easier if he has one ... | 01/01/70 00:00 |