Just wanting to follow up on this. The LCD display is working, just had to remove the R/W parameter from the dts and tie the LCD R/W to ground. The driver does not seem to support reading from the display, so no harm in doing it this way.
amf On Monday, November 2, 2020 at 6:56:25 PM UTC-6 amf wrote: > Hi Mark > Seen RCN's response below. I have several of the *hd44780 LCD displays > also, *spent the weekend trying to get it to work with the info RCN > provided. Seems the R/W line is always high, thus all the data signals are > distorted. If I pull the R/W line low, then the data signals are ok, but > nothing is written to the display. I know the displays are good, I wrote a > uart-to-parallel with an atmel chip several years ago. if you have success > with the Linux driver, I would like to know. > amf > > On Thursday, October 29, 2020 at 1:39:54 PM UTC-5 Mark A. Yoder wrote: > >> I've just recently discovered I have access to lots of 16x2 LCD displays. >> >> I see there are many examples of interfacing it to a Linux machine, but >> most are via user space. I'm looking for kernel space examples. *modinfo >> hd44780* shows a driver is there, but how do I use it. >> >> Is there a device tree for the hd44780 for a parallel interface? >> >> --Mark >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/43062355-7d24-40aa-a24d-2c0753116e5en%40googlegroups.com.
