GLT240128 RS-232 Touchscreen response issues
Posted: Fri Mar 05, 2010 9:28 am
We are using the GLT240128 in a prototype for a new product. I have multiple screens that I can page thru and have set up an average of 6 touchscreen regions per screen. I have the LCD connected to the hardware RS-232 port on a PIC18F4550 so that I can monitor the data available bit and respond quickly to read in the byte when received. I have set the baud rate to 9600.
One of my issues is that occassionally the LCD responds with the byte from the wrong region. I can verify this by tapping off the RS-232 to a PC and watching what bytes come from the LCD using hyperterm. I have the LCD set to only return the down code for the region (and a code for out of bounds)
Another issue is that when setting the LCD to return the down code and an up code, the LCD does not always return the up code after pressing a touchscreen region. I would like to implement scrolling of a value by holding down on a touchregion, which generally works, but when I don't get the up byte my scrolling does not stop.
Any questions or comments are appreciated.
- Thanks... Doug
One of my issues is that occassionally the LCD responds with the byte from the wrong region. I can verify this by tapping off the RS-232 to a PC and watching what bytes come from the LCD using hyperterm. I have the LCD set to only return the down code for the region (and a code for out of bounds)
Another issue is that when setting the LCD to return the down code and an up code, the LCD does not always return the up code after pressing a touchscreen region. I would like to implement scrolling of a value by holding down on a touchregion, which generally works, but when I don't get the up byte my scrolling does not stop.
Any questions or comments are appreciated.
- Thanks... Doug