Guest hitz Posted January 18, 2004 Report Posted January 18, 2004 I just received 2 new 20x2 LCDs from BGMicro and didn't realize they only have a 4 bit interface! Can I still use these for a Midibox64 and a SID? They only have 12 pins to solder out from, is it possible to simply skip D0-D3 when I connect it to the core? Thanks for your help.
TK. Posted January 18, 2004 Report Posted January 18, 2004 Since I had to release a new MIOS version anyhow, I added some code which is necessary to access a 4bit display.Just use mios_v1_5b (or higher) and add following lines below USER_Init: ;; use a CLCD, E input of first CLCD at D.7, E of second CLCD @C.4 ;; using the 4-bit interface: ;; -> connect MBHP_CORE:J15:D7-D4 of the core module to D7-D4 of the LCD ;; -> left MBHP_CORE:J15:D3-D0 of the core module open! ;; -> tie D3-D0 of the LCD to ground movlw 0x37 | 0x80 ; E1: D.7, 4bit interface movwf MIOS_PARAMETER1 movlw 0x24 | 0x80 ; E2: C.4, 4bit interface movwf MIOS_PARAMETER2 movlw 0x00 ; LCD type 0 call MIOS_LCD_TypeSet It doesn't matter if you connect a second display or not to the core, this is just an excerpt from the MIOS_LCD_TypeSet example...Best Regards, Thorsten.
Guest hitz Posted January 20, 2004 Report Posted January 20, 2004 I am not sure exactly where this code is entered. Would it be within "user_vectors.inc" under USER_Init?
TK. Posted January 21, 2004 Report Posted January 21, 2004 No, in the main.asm somewhere within the USER_Init functionBest Regards, Thorsten.
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