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Nokia5110-Class.s
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Nokia5110-Class.s
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; Nokia5110-Class.s (trimmed & slightly modified)
; Sets up SSI0, PA6, PA to work with the
; SParkFun version of the Nokia 5110
; Pin connections
; ------------------------------------------
; Signal (Nokia 5110) LaunchPad pin
; ------------------------------------------
; 3.3V (VCC, pin 1) power
; Ground (GND, pin 2) ground
; SSI0Fss (SCE, pin 3) connected to PA3
; Reset (RST, pin 4) connected to PA7
; Data/Command (D/C, pin 5) connected to PA6
; SSI0Tx (DN, pin 6) connected to PA5
; SSI0Clk (SCLK, pin 7) connected to PA2
; back light (LED, pin 8) not connected, consists of 4 white LEDs which draw ~80mA total
;GPIO Registers
GPIO_PORTA_DATA EQU 0x400043FC ; Port A Data
GPIO_PORTA_IM EQU 0x40004010 ; Interrupt Mask
GPIO_PORTA_DIR EQU 0x40004400 ; Port Direction
GPIO_PORTA_AFSEL EQU 0x40004420 ; Alt Function enable
GPIO_PORTA_DEN EQU 0x4000451C ; Digital Enable
GPIO_PORTA_AMSEL EQU 0x40004528 ; Analog enable
GPIO_PORTA_PCTL EQU 0x4000452C ; Alternate Functions
GPIO_PORTB_DATA EQU 0x400053FC ; Port B Data
GPIO_PORTB_IM EQU 0x40005010 ; Interrupt Mask
GPIO_PORTB_DIR EQU 0x40005400 ; Port Direction
GPIO_PORTB_AFSEL EQU 0x40005420 ; Alt Function enable
GPIO_PORTB_DEN EQU 0x4000551C ; Digital Enable
GPIO_PORTB_AMSEL EQU 0x40005528 ; Analog enable
GPIO_PORTB_PCTL EQU 0x4000552C ; Alternate Functions
;SSI Registers
SSI0_CR0 EQU 0x40008000
SSI0_CR1 EQU 0x40008004
SSI0_DR EQU 0x40008008
SSI0_SR EQU 0x4000800C
SSI0_CPSR EQU 0x40008010
SSI0_CC EQU 0x40008FC8
;System Registers
SYSCTL_RCGCGPIO EQU 0x400FE608 ; GPIO Gate Control
SYSCTL_RCGCSSI EQU 0x400FE61C ; SSI Gate Control
AREA timer, CODE, READONLY
THUMB
EXPORT Nokia_Init
EXPORT OutImgNokia
EXPORT Out1BNokia
;*****************************************************************
; Initializes Nokia display
Nokia_Init
PUSH {LR}
;Setup GPIO
LDR R1, =SYSCTL_RCGCGPIO ; start GPIO clock
MOV R0, #0x01 ; set bit 0 ------------------
STR R0, [R1]
NOP ; allow clock to settle
NOP
NOP
LDR R1,=GPIO_PORTA_DIR ; make PA2,3,5,6,7 output
MOV R0, #0xEF ; and make PA4 input ---------------------
STR R0,[R1]
LDR R1,=GPIO_PORTA_AFSEL ; enable alt funct on PA2,3,4,5
MOV R0, #0x3C ;---------------------
STR R0,[R1]
LDR R1,=GPIO_PORTA_DEN ; enable digital I/O at PA2,3,4,5,6,7
MOV R0, #0xFC ;---------------------
STR R0,[R1]
LDR R1,=GPIO_PORTA_PCTL ; configure PA2,3,4,5 as SSI
LDR R0, =0x222200 ; set 2,3,4 and 5 nibble ---------------
STR R0,[R1]
LDR R1,=GPIO_PORTA_AMSEL ; disable analog functionality
MOV R0, #0x0
STR R0,[R1]
;Setup SSI
LDR R1,=SYSCTL_RCGCSSI ; start SSI clock
MOV R0, #0x01 ; set bit 0 for SSI0 -------------------
STR R0,[R1]
; small delay
MOV R0,#0x0F
waitSSIClk ; allow clock to settle
SUBS R0,R0,#0x01
BNE waitSSIClk
LDR R1,=SSI0_CR1 ; disable SSI during setup and also set to Master
LDR R0, [R1];added
BIC R0, #0xFF ; clear bit 1 and clear bit 2 (you can clear all bits)
STR R0,[R1]
; Configure baud rate PIOSC=16MHz,Baud=2MHz,CPSDVSR=4,SCR=1
; BR=SysClk/(CPSDVSR * (1 + SCR))
LDR R1,=SSI0_CC ; use PIOSC (16MHz)
MOV R0, #0x05 ; set bits 3:0 of the SSICC to 0x5--------------------
STR R0,[R1]
LDR R1,=SSI0_CR0 ; set SCR bits to 0x01
LDR R0,[R1]
ORR R0, #0x0100 ;---------------------------
STR R0,[R1]
LDR R1,=SSI0_CPSR ; set CPSDVSR (prescale) to 0x04
MOV R0, #0x04 ;--------------------
STR R0,[R1]
LDR R1,=SSI0_CR0 ; clear SPH,SPO
LDR R0,[R1] ; choose Freescale frame format
BIC R0, #0xFF ; clear bits 5:4 --------------------
ORR R0, #0x07 ; choose 8-bit data (set DSS bits to 0x07) -----------------
STR R0,[R1]
LDR R1,=SSI0_CR1 ; enable SSI
MOV R0,#0x2 ; set bit 1----------------------asdfasdf
STR R0,[R1]
; DC = PA7
; Reset LCD memory - reset already low
; ensure reset is low
LDR R1,=GPIO_PORTA_DATA
LDR R0, [R1];added
BIC R0, #0x80 ; clear reset(PA7)---------------------
STR R0,[R1]
MOV R0,#10
delReset
SUBS R0,R0,#1
BNE delReset
LDR R1,=GPIO_PORTA_DATA ;
LDR R0, [R1];added
ORR R0, #0x80 ; set reset(PA7)------------------------
STR R0,[R1] ;
; Setup LCD
LDR R1,=GPIO_PORTA_DATA ; set PA6 low for Command
LDR R0,[R1]
BIC R0, #0x40 ;
STR R0,[R1]
;chip active (PD=0)
;extended instruction set (H=1)
MOV R5,#0x21
BL Out1BNokia
;set contrast
MOV R5,#0xB8
BL Out1BNokia
;set temp coefficient
MOV R5,#0x04
BL Out1BNokia
;set bias 1:48: try 0x13 or 0x14
MOV R5,#0x14
BL Out1BNokia
;change H=0
MOV R5,#0x20
BL Out1BNokia
;set control mode to normal
MOV R5,#0x0C
BL Out1BNokia
; clear screen
; screen memory is undefined after startup
BL ClearNokia
waitCMDDone
LDR R1,=SSI0_SR ; wait until SSI is done
LDR R0,[R1]
ANDS R0,R0,#0x10
BNE waitCMDDone
POP {LR}
BX LR
;*****************************************************************
; SSI Send routine. Bits to be sent passed via R5
Out1BNokia
PUSH {R0,R1}
waitSendNokia
LDR R1,=SSI0_SR ; wait if buffer is full
LDR R0,[R1]
ANDS R0,R0,#0x02
BEQ waitSendNokia
LDR R1,=SSI0_DR
STRB R5,[R1]
POP {R0,R1}
BX LR
;*****************************************************************
; Send Image to Nokia routine
OutImgNokia
PUSH {R0-R4,LR}
PUSH {R5} ; save Img address
LDR R1,=GPIO_PORTA_DATA ; set PA6 low for Command
LDR R0,[R1]
BIC R0,#0x40
STR R0,[R1]
MOV R5,#0x22 ; Only modification. Ensure H=0, V=1
BL Out1BNokia
MOV R5,#0x40 ; set Y address to 0
BL Out1BNokia
MOV R5,#0x80 ; set X address to 0
BL Out1BNokia
waitImgReady
LDR R1,=SSI0_SR ; wait until SSI is done
LDR R0,[R1]
ANDS R0,R0,#0x10
BNE waitImgReady
LDR R1,=GPIO_PORTA_DATA ; ready: set PA6 high for Data
LDR R0,[R1]
ORR R0,#0x40
STR R0,[R1]
POP {R5}
MOV R0,#504 ; 504 bytes in full image
MOV R1,R5 ; put img address in R1
sendNxtByteNokia
LDRB R5,[R1],#1 ; load R5 with byte, post inc address
BL Out1BNokia
SUBS R0,#1
BNE sendNxtByteNokia
POP {R0-R4,LR}
BX LR
;*****************************************************************
; clear LCD screen
ClearNokia
PUSH {R0-R5,LR}
LDR R1,=GPIO_PORTA_DATA ; set PA6 low for Command
LDR R0,[R1]
BIC R0,#0x40
STR R0,[R1]
MOV R5,#0x20 ; ensure H=0
BL Out1BNokia
MOV R5,#0x40 ; set Y address to 0
BL Out1BNokia
MOV R5,#0x80 ; set X address to 0
BL Out1BNokia
waitClrReady
LDR R1,=SSI0_SR ; wait until SSI is done
LDR R0,[R1]
ANDS R0,R0,#0x10
BNE waitClrReady
LDR R1,=GPIO_PORTA_DATA ; set PA6 high for Data
LDR R0,[R1]
ORR R0,#0x40
STR R0,[R1]
MOV R0,#504 ; 504 bytes in full image
MOV R5,#0x00 ; load zeros to send
clrNxtNokia
BL Out1BNokia
SUBS R0,#1
BNE clrNxtNokia
waitClrDone
LDR R1,=SSI0_SR ; wait until SSI is done
LDR R0,[R1]
ANDS R0,R0,#0x10
BNE waitClrDone
POP {R0-R5,LR}
BX LR
;*****************************************************************
ALIGN
END