Hello friends,
I am working with atmega32 and LG322401 graphic lcd. In this project, i am not getting any o/p on the lcd screen. So if you people have worked with this, then please help me.

I have attached my test code.
If you have simple demo code, then please provide me.

Thanks in advance.
Sachin Rathod,
Surat..



.include "m32def.inc"

.equ RD = 0
.equ WR = 1
.equ A0 = 2
.equ CS = 3
.equ RST = 4
.equ FS1 = 5

.equ DataPort = PORTC
.equ CtrlPort = PORTD
.equ DataDDR = DDRC
.equ CtrlDDR = DDRD

.def Temp = r16
.def Dly1 = r17
.def Dly2 = r18

Reset:
LDI Temp, 0x5F
OUT SPL, Temp
LDI Temp, 0x08
OUT SPH, Temp

RCALL IOInit
RCALL LcdInit

Loop:
RCALL TestData
RCALL Loop

Forever:
RJMP Forever

IOInit:
LDI Temp, 0xFF ; r16 = 0xFF
OUT DataDDR, Temp ; Lcd data lines o/p dir
LDI Temp, 0x3F ; r16 = 0x3F
OUT CtrlDDR, Temp ; Lcd ctrl lines o/p dir
RET ; Return from subroutine

WrLcdCmd:
SBI CtrlPort, A0 ; A0 = 1, Select IR
OUT DataPort, Temp ; Write command to lcd
CBI CtrlPort, WR ; WR = 0
NOP ; No operation
NOP ; No operation
NOP ; No operation
SBI CtrlPort, WR ; WR = 1
RET ; Return from subroutine

WrLcdDat:
CBI CtrlPort, A0 ; A0 = 0, Select DR
OUT DataPort, Temp ; Write command to lcd
CBI CtrlPort, WR ; WR = 0
NOP ; No operation
NOP ; No operation
NOP ; No operation
SBI CtrlPort, WR ; WR = 1
RET ; Return from subroutine

LcdInit:
SBI CtrlPort, RD ; RD = 1
SBI CtrlPort, WR ; WR = 1
CBI CtrlPort, CS ; CS = 0, Enable chip
CBI CtrlPort, FS1 ; FS1 = 0, 6x8 dots font selection
CBI CtrlPort, RST ; RST = 0
RCALL Dly2ms ; Delay
RCALL Dly2ms ; Delay
SBI CtrlPort, RST ; RST = 1
RET ; Return from subroutine

Dly2ms:
PUSH Temp ; Store r16
PUSH Dly1 ; Store r17
PUSH Dly2 ; Store r18
LDI Temp, 0x08 ; r16 = 0x08
Dly2msL1:
LDI Dly1, 0xA6 ; r17 = 0xA6
LDI Dly2, 0xA6 ; r18 = 0xA6
Dly2msL2:
DEC Dly1 ; Decrement r17
BRNE Dly2msL2 ; Branch if r17 != 0x00
Dly2msL3:
DEC Dly2 ; Decrement r18
BRNE Dly2msL3 ; Branch if r18 != 0x00
DEC Temp ; Decrement r16
BRNE Dly2msL1 ; Branch if r16 != 0x00
POP Dly2 ; Retrieve r18
POP Dly1 ; Retrieve r17
POP Temp ; Retrieve r16
RET ; Return from subroutine

Clr1stLayer:
LDI Temp, 0x46 ; CSRW
RCALL WrLcdCmd ; Set cursor address
LDI Temp, 0x00 ; Lsb address
RCALL WrLcdDat ; Send it
LDI Temp, 0x00 ; Msb address
RCALL WrLcdDat ; Set 1st address of 1st layer
LDI Temp, 0x4C ; CSR DIR
RCALL WrLcdCmd ; Set cursor shift direction to right
LDI Temp, 0x42 ; MWRITE
RCALL WrLcdCmd ; Send it
LDI Dly2, 0x08 ; r18 = 8
Rep0x80Times2:
LDI Dly1, 0x80 ; r17 = 128
Rep0x80Times:
DEC Dly1 ; Decrement r17
LDI Temp, 0x20 ; Space
RCALL WrLcdDat ; Send it
BRNE Rep0x80Times ; Branch if r17 != 0x00
DEC Dly2 ; Decrement r18
BRNE Rep0x80Times2 ; Branch if r18 != 0x00
RET ; Return from subroutine

Clr2ndLayer:
LDI Temp, 0x46 ; CSRW
RCALL WrLcdCmd ; Set cursor address
LDI Temp, 0x00 ; Lsb address
RCALL WrLcdDat ; Send it
LDI Temp, 0x10 ; Msb address
RCALL WrLcdDat ; Set 1st address of 1st layer
LDI Temp, 0x4C ; CSR DIR
RCALL WrLcdCmd ; Set cursor shift direction to right
LDI Temp, 0x42 ; MWRITE
RCALL WrLcdCmd ; Send it
LDI Dly2, 0x40 ; r18 = 64
Rep0x80Times4:
LDI Dly1, 0x80 ; r17 = 128
Rep0x80Times3:
DEC Dly1 ; Decrement r17
LDI Temp, 0x00 ; Blank
RCALL WrLcdDat ; Send it
BRNE Rep0x80Times3 ; Branch if r17 != 0x00
DEC Dly2 ; Decrement r18
BRNE Rep0x80Times4 ; Branch if r18 != 0x00
RET ; Return from subroutine

TestData:
; 3
LDI Temp, 0x40 ; System set
RCALL WrLcdCmd
LDI Temp, 0x38 ; P1
RCALL WrLcdDat
LDI Temp, 0x87 ; P2
RCALL WrLcdDat
LDI Temp, 0x07 ; P3
RCALL WrLcdDat
LDI Temp, 0x3F ; P4
RCALL WrLcdDat
LDI Temp, 0x49 ; P5
RCALL WrLcdDat
LDI Temp, 0x7F ; P6
RCALL WrLcdDat
LDI Temp, 0x80 ; P7
RCALL WrLcdDat
LDI Temp, 0x00 ; P8
RCALL WrLcdDat

; 4
LDI Temp, 0x44 ; Scroll
RCALL WrLcdCmd
LDI Temp, 0x00 ; P1
RCALL WrLcdDat
LDI Temp, 0x00 ; P2
RCALL WrLcdDat
LDI Temp, 0x40 ; P3
RCALL WrLcdDat
LDI Temp, 0x00 ; P4
RCALL WrLcdDat
LDI Temp, 0x10 ; P5
RCALL WrLcdDat
LDI Temp, 0x40 ; P6
RCALL WrLcdDat
LDI Temp, 0x00 ; P7
RCALL WrLcdDat
LDI Temp, 0x04 ; P8
RCALL WrLcdDat
LDI Temp, 0x00 ; P9
RCALL WrLcdDat
LDI Temp, 0x30 ; P10
RCALL WrLcdDat

; 5
LDI Temp, 0x5A ; HDOT SCR
RCALL WrLcdCmd
LDI Temp, 0x00 ; P1
RCALL WrLcdDat

; 6
LDI Temp, 0x5B ; OVLAY
RCALL WrLcdCmd
LDI Temp, 0x01 ; P1
RCALL WrLcdDat

; 7
LDI Temp, 0x58 ; DISP ON/OFF
RCALL WrLcdCmd
LDI Temp, 0x56 ; P1
RCALL WrLcdDat

; 8
RCALL Clr1stLayer

; 9
RCALL Clr2ndLayer

; 10
LDI Temp, 0x46 ; CSRW
RCALL WrLcdCmd
LDI Temp, 0x00 ; P1
RCALL WrLcdDat
LDI Temp, 0x00 ; P2
RCALL WrLcdDat

; 11
LDI Temp, 0x5D ; CSR FORM
RCALL WrLcdCmd
LDI Temp, 0x04 ; P1
RCALL WrLcdDat
LDI Temp, 0x86 ; P2
RCALL WrLcdDat

; 12
LDI Temp, 0x59 ; DISP ON/OFF
RCALL WrLcdCmd

; 13
LDI Temp, 0x4C ; CSR DIR
RCALL WrLcdCmd

; 14
LDI Temp, 0x42 ; MWRITE
RCALL WrLcdCmd
LDI Temp, 0x20 ; P1 ' '
RCALL WrLcdDat
LDI Temp, 0x45 ; P2 'E'
RCALL WrLcdDat
LDI Temp, 0x50 ; P3 'P'
RCALL WrLcdDat
LDI Temp, 0x53 ; P4 'S'
RCALL WrLcdDat
LDI Temp, 0x4F ; P5 'O'
RCALL WrLcdDat
LDI Temp, 0x4E ; P6 'N'
RCALL WrLcdDat

; 15
LDI Temp, 0x46 ; CSRW
RCALL WrLcdCmd
LDI Temp, 0x00 ; P1
RCALL WrLcdDat
LDI Temp, 0x10 ; P2
RCALL WrLcdDat

; 16
LDI Temp, 0x4F ; CSR DIR
RCALL WrLcdCmd

; 17
LDI Temp, 0x42 ; MWRITE
RCALL WrLcdCmd
LDI Temp, 0xFF ; P1
RCALL WrLcdDat
LDI Temp, 0xFF ; P2
RCALL WrLcdDat
LDI Temp, 0xFF ; P3
RCALL WrLcdDat
LDI Temp, 0xFF ; P4
RCALL WrLcdDat
LDI Temp, 0xFF ; P5
RCALL WrLcdDat
LDI Temp, 0xFF ; P6
RCALL WrLcdDat
LDI Temp, 0xFF ; P7
RCALL WrLcdDat
LDI Temp, 0xFF ; P8
RCALL WrLcdDat
LDI Temp, 0xFF ; P9
RCALL WrLcdDat

; 18
LDI Temp, 0x46 ; CSRW
RCALL WrLcdCmd
LDI Temp, 0x01 ; P1
RCALL WrLcdDat
LDI Temp, 0x10 ; P2
RCALL WrLcdDat

; 19
LDI Temp, 0x42 ; MWRITE
RCALL WrLcdCmd
LDI Temp, 0xFF ; P1
RCALL WrLcdDat
LDI Temp, 0xFF ; P2
RCALL WrLcdDat
LDI Temp, 0xFF ; P3
RCALL WrLcdDat
LDI Temp, 0xFF ; P4
RCALL WrLcdDat
LDI Temp, 0xFF ; P5
RCALL WrLcdDat
LDI Temp, 0xFF ; P6
RCALL WrLcdDat
LDI Temp, 0xFF ; P7
RCALL WrLcdDat
LDI Temp, 0xFF ; P8
RCALL WrLcdDat
LDI Temp, 0xFF ; P9
RCALL WrLcdDat
RET