Unintentional ASCII char actor showing up on Adafruit serial lcd

Perpetual_NOOB

I've got a project using the Serial LCD
https://www.adafruit.com/product/499

Everything is working pretty well except that when I use the LCD.CLS command I get an ascii character that correlates to the last command in hex from the cls routine.

has anyone else ran into it and what's the fix?

Publison

Welcome to the forums.

What Parallax product are you trying to use this with? Can you post the code?

Perpetual_NOOB

Prop Chip #1

using this
SparkFun Serial LCD driver.spin

here's the first statement and the "X" appears as soon as the CLS command is given


LCD.init(TX_PIN, BAUD, 4, 20) 'Sets buad rate and pin for Adafruit Serial back pack display
LCD.cls
wait_ms(100)
lcd.str(string("Core_5_AD_seccnt_2_roundrobin_rc_2")) 'Splash SCREEN_ST



of course there is a bunch more code but I used a long pause between statements to watch when the "x" appears and it's there as soon as I use the cls command

Publison

I'm not sure there is enough information with the code. Which Spin program are you using for LCD?

jac_goudsmit

I don't know the Sparkfun Serial LCD driver module but the Serial_LCD module from the library should (also) work fine; All LCD modules use pretty much the same command set. For some reason, the Sparkfun module must be sending the wrong code or maybe it doesn't wait for the display controller to process it.

'' NOTE: untested

VAR
  LCD: "Serial_LCD"

PUB Start
  LCD.Init(TX_PIN, BAUD, 4)
  LCD.Cls
  wait_ms(100) ' Display should be blank
  lcd.str(string("Does this fix it?"))

===Jac

JonnyMac

I'm confused... the LCD you link to is a parallel LCD. What serial adapter are you using?

Perpetual_NOOB

https://www.adafruit.com/product/499

With

https://www.adafruit.com/product/781

Your right, I was too close to the problem when I wrote the post.