27 Feb '14, 6pm

Fail of the Week: Reset Issues with 595 and HD44780: We really like to see hardware hackers s... #TeamFollowBack

Fail of the Week: Reset Issues with 595 and HD44780: We really like to see hardware hackers s... #TeamFollowBack

It sounds to me that there may be problems with your LCD init code. As several people pointed out already, you are using 4-bit mode, which can leave you out of sync if you are in the middle of a transfer. Also, after reset, all the pins on the uc are input (hi-z) so the inputs to the shift register may be picking up noise. You also may need to check your init code to make sure that it follows the correct HD44780 procedure – software reset into 8-bit mode via three timed writes and then set the mode. One thing that I just thought though, if the display has already been configured for 4-bit mode (and after the uc has been reset) then will you have to send the first reset as 2 nibbles? I guess it never hurts to do the reset sequence a few times just to make sure. Anyway, I used i2c to talk to a HD44780 and wrote my own routines to do it and followed the init procedure from th...

Full article: http://hackaday.com/2014/02/27/fail-of-the-week-reset-iss...

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