| ??? 03/14/08 22:02 Read: times |
#152268 - Looks like wrong 4-bit initialisation. Responding to: ???'s previous message |
The LCD modules default to 8 bit operation, and will tend to work from switch on.
Read the data sheet page that gives the 4-bit initialisation sequence. Especially power up risetimes, and fixed delays between the first write operations. HD44780 and clones require you to follow this EXACTLY. Then everything will be ok. David. |
| Topic | Author | Date |
| 4-bit LCD | 01/01/70 00:00 | |
| so problem is not in LCD | 01/01/70 00:00 | |
| C or assembler ? | 01/01/70 00:00 | |
| red flag killer, ignore | 01/01/70 00:00 | |
| "couldn't get an output" | 01/01/70 00:00 | |
| To Mr.Neil | 01/01/70 00:00 | |
| So you know where to look... | 01/01/70 00:00 | |
| Sorry....... Mr.Neil | 01/01/70 00:00 | |
| Not to worry... | 01/01/70 00:00 | |
| 2nd line? | 01/01/70 00:00 | |
| Puzzle | 01/01/70 00:00 | |
| the problem is ... | 01/01/70 00:00 | |
| Looks like wrong 4-bit initialisation. | 01/01/70 00:00 | |
| HD44780 is a loose standard | 01/01/70 00:00 | |
| It all depends on the control IC. | 01/01/70 00:00 | |
| We should | 01/01/70 00:00 | |
| Most LCDs most of the time. | 01/01/70 00:00 | |
| Interesting notion ... read the datasheet ... Hmmm | 01/01/70 00:00 | |
| E strobe | 01/01/70 00:00 | |
| The E Strobe,,, | 01/01/70 00:00 | |
EP0333318 | 01/01/70 00:00 |