I am trying to write a program to display custom character on LCD using CGRAM. I am using 68HC11 MCU and 20x2 LCD for this purpose.
I attached my code in attachment. I don't seem to get anything on LCD. The HEX pattern, CC, is supposed to look like a speaker. Any help would great.
ORG $6000 CC FCB $06,$0f,$0f,$0f,$0f,$0f,$0f,$00 ORG $7000 MAIN JSR LCD_CLR JSR DSP_CC SWI DSP_CC LDY #$40 JSR LCD_TEST LDX #CC JSR LCD_DSP RTS LCD_CLR LDAA #$01 JSR LCD_TEST STAA $1400 RTS LCD_TEST TST $1400 BMI LCD_TEST RTS LCD_DSP LDAA 0,X LDAB 0,Y STAB $1400 CMPA #00 BEQ FINISH JSR LCD_TEST STAA $1401 INX INY JMP LCD_DSP FINISH RTS