GLCD not printing negative numbers

[MBB]

I'm using this GLCD https://www.adafruit.com/product/1770

I wrote this simple program to print out a negative number on my LCD and GLCD.

   ;Chip Settings
  #chip 18F4550,48
  #config PLLDIV=1, CPUDIV=OSC1_PLL2, OSC=HSPLL_HS, LVP=OFF, MCLRE=ON

  ;Defines (Constants)
  #define LCD_IO 2
  #define LCD_CB PORTE.1
  #define LCD_DB PORTE.0
  '
'Defines for ILI9341  240 x 320
  #define GLCD_TYPE GLCD_TYPE_ILI9341

  #define GLCD_DI portd.0
  #define GLCD_SCK portd.1
  #define GLCD_DC portd.2
  #define GLCD_CS portd.3
  #define GLCD_RESET portd.4
  #define GLCD_DO portd.5

 #include <glcd.h>

        Dim xx as Integer
        xx = -17

        locate 0, 0
            print xx   ;prints out -17

        GLCDPrint(10, 10, xx, TFT_YELLOW)   ;prints out 65519 NOT -17

'****
Why does the LCD correctly print -17 but the GLCD incorrectly print 65519?

It appears to be something with twos complement in reverse as the twos complement 0f 65519 is -17.

This happens with other negative numbers, too. Positive numbers print correctly.

[Anobium]

What happens when you use glcddrawstring ( 10, 10, str(xx)) or
glcdprint (10, 10, str(xx))

[Anobium]

I think the Help needed an update. See https://github.com/Anobium/Great-Cow-BASIC-Help/blob/master/source/glcdprint.adoc

[MBB]

Using glcddrawstring ( 10, 10, str(xx)) or glcdprint (10, 10, str(xx)) gives the same results 65519.

Why STR? I'm trying to print an integer

[MBB]

I tried some more. This works:

Dim xxSTR as string
    xx = -17
        xxSTR = strinteger(xx)
            GLCDPrint(10, 10, xxSTR, TFT_YELLOW) ;prints out 65519 NOT -17   WHY?
                    glcddrawstring ( 20, 20, xxSTR)

[Anobium]

Stupid me.... you are correct. strinteger

What happens when you use glcddrawstring ( 10, 10, strinteger(xx)) or
glcdprint (10, 10, strinteger(xx))

I will update the Help now. Please confirm this works.

[Anobium]

To answer why use strinteger. GLCDPrint only support byte, word, long or string.

If you think is it critical to add the integer type to GLCDPrint then it is relatively simple ( I think).

Add? You will have to test.

[MBB]

Its not critical for me.

Thanks for your help!

[Anobium]

OK.   I have updated the Help. That was less work.

CHEERS