📄 st7920.s
字号:
.module ST7920.c
.area text(rom, con, rel)
.dbfile F:\毕业设计\LCM12864\ST7920.c
.dbfunc e Delayus _Delayus fV
; i -> y+0
; x -> y+8
.even
_Delayus::
xcall push_arg4
sbiw R28,8
.dbline -1
.dbline 10
; #include "ST7920.h"
; void Delayus(ulong x);
; void Delayms(uchar x);
; void BUSYLOOP(void);
; void WriteCommand(uchar command);
; void WriteData(uchar data);
;
; /**********************延时程序START********************************/
; void Delayus(ulong x)
; { ulong i;
.dbline 11
; i = x<<4;
ldi R24,4
ldi R25,0
ldd R16,y+8
ldd R17,y+9
ldd R18,y+10
ldd R19,y+11
st -y,R24
xcall lsl32
std y+0,R16
std y+1,R17
std y+2,R18
std y+3,R19
L2:
.dbline 12
; while(i--);
L3:
.dbline 12
ldd R2,y+0
ldd R3,y+1
ldd R4,y+2
ldd R5,y+3
std y+4,R2
std y+5,R3
std y+6,R4
std y+7,R5
ldi R24,1
ldi R25,0
ldi R26,0
ldi R27,0
ldd R2,y+4
ldd R3,y+5
ldd R4,y+6
ldd R5,y+7
sub R2,R24
sbc R3,R25
sbc R4,R26
sbc R5,R27
std y+0,R2
std y+1,R3
std y+2,R4
std y+3,R5
ldd R2,y+4
ldd R3,y+5
ldd R4,y+6
ldd R5,y+7
ldi R16,0
cp R2,R16
cpc R3,R16
cpc R4,R16
cpc R5,R16
brne L2
X0:
.dbline -2
L1:
.dbline 0 ; func end
adiw R28,12
ret
.dbsym l i 0 l
.dbsym l x 8 l
.dbend
.dbfunc e Delayms _Delayms fV
; i -> R20,R21
; x -> R10
.even
_Delayms::
xcall push_xgset300C
mov R10,R16
.dbline -1
.dbline 15
; }
; void Delayms(uchar x)
; { uint i;
.dbline 16
; i = x;
mov R20,R10
clr R21
xjmp L7
L6:
.dbline 17
; while(i--)Delayus(1000);
ldi R16,232
ldi R17,3
ldi R18,0
ldi R19,0
xcall _Delayus
L7:
.dbline 17
movw R2,R20
subi R20,1
sbci R21,0
tst R2
brne L6
tst R3
brne L6
X1:
.dbline -2
L5:
.dbline 0 ; func end
xjmp pop_xgset300C
.dbsym r i 20 i
.dbsym r x 10 c
.dbend
.dbfunc e BUSYLOOP _BUSYLOOP fV
.even
_BUSYLOOP::
.dbline -1
.dbline 20
; }
; void BUSYLOOP(void)
; {
.dbline 21
; Delayus(10);
ldi R16,10
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline -2
L9:
.dbline 0 ; func end
ret
.dbend
.dbfunc e lcm_out _lcm_out fV
; d -> R22
; i -> R20
; a -> R16
.even
_lcm_out::
st -y,R20
st -y,R22
.dbline -1
.dbline 27
; }
; /**********************延时程序END********************************/
;
; /**********************串行方式相关程序START*********************/
; void lcm_out(uchar a)
; {
.dbline 29
; char i,d;
; for(i=0;i<8;i++)
clr R20
xjmp L14
L11:
.dbline 30
; {
.dbline 31
; clrbit(LCD_CTRL,E);
cbi 0x18,7
.dbline 32
; d=a&0x80;
mov R22,R16
andi R22,128
.dbline 33
; if(d)
breq L15
X2:
.dbline 34
; setbit(LCD_CTRL,RW);
sbi 0x18,6
xjmp L16
L15:
.dbline 36
; else
; clrbit(LCD_CTRL,RW);
cbi 0x18,6
L16:
.dbline 37
; a<<=1;
lsl R16
.dbline 38
; setbit(LCD_CTRL,E); //上升弦发送
sbi 0x18,7
.dbline 39
; }
L12:
.dbline 29
inc R20
L14:
.dbline 29
cpi R20,8
brlo L11
X3:
.dbline -2
L10:
.dbline 0 ; func end
ld R22,y+
ld R20,y+
ret
.dbsym r d 22 c
.dbsym r i 20 c
.dbsym r a 16 c
.dbend
.dbfunc e WriteCommand _WriteCommand fV
; s -> R20
; command -> R22
.even
_WriteCommand::
st -y,R20
st -y,R22
mov R22,R16
.dbline -1
.dbline 44
; }
;
;
; void WriteCommand(uchar command) //发送命令字
; {
.dbline 46
; uchar s; //,i;
; s=command&0xf0;
mov R20,R22
andi R20,240
.dbline 47
; lcm_out(0xf8); //送写命令指令 1111 1 RW=0 RS=0 0
ldi R16,248
xcall _lcm_out
.dbline 48
; lcm_out(s); //发送高四位数据
mov R16,R20
xcall _lcm_out
.dbline 49
; s=command&0x0f;
mov R20,R22
andi R20,15
.dbline 50
; s<<=4;
mov R24,R20
andi R24,#0x0F
swap R24
mov R20,R24
.dbline 51
; lcm_out(s); //发送低四位数据
mov R16,R24
xcall _lcm_out
.dbline -2
L17:
.dbline 0 ; func end
ld R22,y+
ld R20,y+
ret
.dbsym r s 20 c
.dbsym r command 22 c
.dbend
.dbfunc e WriteData _WriteData fV
; s -> R20
; data -> R22
.even
_WriteData::
st -y,R20
st -y,R22
mov R22,R16
.dbline -1
.dbline 57
; //for(i=1;i>0;i--)BUSYLOOP(); //延时10us 延时后写命令就消失？
; }
;
;
; void WriteData(uchar data)
; {
.dbline 60
;
; uchar s; //,i;
; s=data&0xf0;
mov R20,R22
andi R20,240
.dbline 61
; lcm_out(0xfa); //送写数据指令 1111 1 RW=0 RS=1 0
ldi R16,250
xcall _lcm_out
.dbline 62
; lcm_out(s);
mov R16,R20
xcall _lcm_out
.dbline 63
; s=data&0x0f;
mov R20,R22
andi R20,15
.dbline 64
; s<<=4;
mov R24,R20
andi R24,#0x0F
swap R24
mov R20,R24
.dbline 65
; lcm_out(s);
mov R16,R24
xcall _lcm_out
.dbline -2
L18:
.dbline 0 ; func end
ld R22,y+
ld R20,y+
ret
.dbsym r s 20 c
.dbsym r data 22 c
.dbend
.dbfunc e lcdSetXY _lcdSetXY fV
; position -> R20
; y -> R10
; x -> R22
.even
_lcdSetXY::
xcall push_xgsetF00C
mov R10,R18
mov R22,R16
.dbline -1
.dbline 75
; //for(i=1;i>0;i--)BUSYLOOP(); //延时10us 延时后写命令就无效？
; }
; /**********************串行方式相关程序END*********************/
;
;
; /**********************液晶文字显示相关程序START*************/
;
;
; void lcdSetXY(uchar x,uchar y) //定位坐标的位置，这个主要跟字符显示相关
; { //x:横0-15 y：纵 0-3 ；x,y对应12864的坐标
.dbline 76
; unsigned char position=0;
clr R20
.dbline 77
; x &= 0x0f;//x%16;
andi R22,15
.dbline 78
; switch(y%4)
ldi R18,4
ldi R19,0
mov R16,R10
clr R17
xcall mod16s
movw R10,R16
cpi R16,0
cpc R16,R17
breq L23
X4:
movw R24,R10
cpi R16,1
ldi R30,0
cpc R17,R30
breq L24
X5:
cpi R16,2
ldi R30,0
cpc R17,R30
breq L25
X6:
cpi R16,3
ldi R30,0
cpc R17,R30
breq L26
X7:
xjmp L21
L23:
.dbline 80
; { //第零行和第二行寄存器连续 第一行和第三行寄存器连续
; case 0: position = 0x80 + (x>>1); break; // |0x80 ~ 0x87|
mov R20,R22
lsr R20
subi R20,128 ; addi 128
.dbline 80
xjmp L21
L24:
.dbline 81
; case 1: position = 0x90 + (x>>1); break; // |0x90 ~ 0x97|
mov R20,R22
lsr R20
subi R20,112 ; addi 144
.dbline 81
xjmp L21
L25:
.dbline 82
; case 2: position = 0x88 + (x>>1); break; // |0x88 ~ 0x8f|
mov R20,R22
lsr R20
subi R20,120 ; addi 136
.dbline 82
xjmp L21
L26:
.dbline 83
; case 3: position = 0x98 + (x>>1); break; // |0x98 ~ 0x9f|
mov R20,R22
lsr R20
subi R20,104 ; addi 152
.dbline 83
.dbline 84
; default: break;
L21:
.dbline 86
; }
; WriteCommand(position);
mov R16,R20
xcall _WriteCommand
.dbline -2
L19:
.dbline 0 ; func end
xjmp pop_xgsetF00C
.dbsym r position 20 c
.dbsym r y 10 c
.dbsym r x 22 c
.dbend
.dbfunc e SetGraphicAddr _SetGraphicAddr fV
; ytemp -> R22
; y -> R10
; x -> R20
.even
_SetGraphicAddr::
xcall push_xgsetF00C
mov R10,R18
mov R20,R16
.dbline -1
.dbline 91
; }
;
; //x:横0-15 y：纵 0-63
; void SetGraphicAddr(uchar x,uchar y)
; {
.dbline 93
; uchar ytemp;
; EX_FT(); //跟绘图设置有关 8BIT控制界面，扩充指令集,，绘图显示开
ldi R16,54
xcall _WriteCommand
.dbline 94
; ytemp = (y & 0x1f) | 0x80;
mov R22,R10
andi R22,31
ori R22,128
.dbline 95
; WriteCommand(ytemp); //先写st7920 垂直坐标
mov R16,R22
xcall _WriteCommand
.dbline 96
; ytemp = (y>>5); //12864的y坐标打印32的对应ST水平坐标0x88~0x8f,垂直坐标(y-32)
mov R22,R10
lsr R22
lsr R22
lsr R22
lsr R22
lsr R22
.dbline 97
; x &= 0x0f;//x%16;
andi R20,15
.dbline 98
; x = 0x80 +(ytemp<<3) + (x>>1); //0 |0x80 ~ 0x87|
mov R2,R20
lsr R2
mov R20,R22
lsl R20
lsl R20
lsl R20
subi R20,128 ; addi 128
add R20,R2
.dbline 99
; WriteCommand(x); //1 |
mov R16,R20
xcall _WriteCommand
.dbline 104
; //. |数值表示st的位址
; //. |
; //31|
; //0 |0x88 ~ 0x8f|
; FunctionSet(); //功能设置 8位数据，基本指令
ldi R16,48
xcall _WriteCommand
.dbline -2
L27:
.dbline 0 ; func end
xjmp pop_xgsetF00C
.dbsym r ytemp 22 c
.dbsym r y 10 c
.dbsym r x 20 c
.dbend
.dbfunc e lcdInit _lcdInit fV
.even
_lcdInit::
.dbline -1
.dbline 109
; }
;
;
; void lcdInit() //液晶初始化
; {
.dbline 111
; //初始化控制管脚
; DDR_LCD_CTRL |= BIT(RS);
sbi 0x17,5
.dbline 112
; DDR_LCD_CTRL |= BIT(RW);
sbi 0x17,6
.dbline 113
; DDR_LCD_CTRL |= BIT(E);
sbi 0x17,7
.dbline 114
; LCD_CTRL |= BIT(RS);
sbi 0x18,5
.dbline 115
; LCD_CTRL |= BIT(RW);
sbi 0x18,6
.dbline 116
; LCD_CTRL |= BIT(E);
sbi 0x18,7
.dbline 118
;
; FunctionSet();
ldi R16,48
xcall _WriteCommand
.dbline 119
; Delayus(150);
ldi R16,150
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline 121
;
; FunctionSet();
ldi R16,48
xcall _WriteCommand
.dbline 122
; Delayus(50);
ldi R16,50
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline 124
;
; DisplayOff();
ldi R16,8
xcall _WriteCommand
.dbline 125
; Delayus(150);
ldi R16,150
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline 127
;
; lcdClear(); //清屏程序 需要毫秒级的延时
.dbline 127
ldi R16,1
xcall _WriteCommand
.dbline 127
ldi R16,10
xcall _Delayms
.dbline 127
.dbline 127
.dbline 128
; Delayus(150);
ldi R16,150
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline 129
; EntryModeSet(); //设定写入时候指针右移
ldi R16,6
xcall _WriteCommand
.dbline 130
; DisplayOn();
ldi R16,12
xcall _WriteCommand
.dbline 131
; Delayus(50);
ldi R16,50
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline 132
; DisplayOn();
ldi R16,12
xcall _WriteCommand
.dbline 133
; Delayus(50);
ldi R16,50
ldi R17,0
ldi R18,0
ldi R19,0
xcall _Delayus
.dbline -2
L28:
.dbline 0 ; func end
ret
.dbend
.dbfunc e lcdDisplay _lcdDisplay fV
; LineDispCnt -> R12
; i -> R10
; ptr -> R20,R21
; y -> R14
; x -> R22
.even
_lcdDisplay::
xcall push_xgsetF0FC
mov R14,R18
mov R22,R16
ldd R20,y+10
ldd R21,y+11
.dbline -1
.dbline 137
; }
;
; void lcdDisplay( uchar x, uchar y, uchar *ptr ) //行写满自动换行
; {
.dbline 139
; uchar i;
; uchar LineDispCnt = 0;
.dbline 140
; LineDispCnt = (16-x+x%2);
ldi R17,2
mov R16,R22
xcall mod8u
ldi R24,16
mov R12,R24
sub R12,R22
add R12,R16
.dbline 141
; lcdSetXY(x,y);
mov R18,R14
mov R16,R22
xcall _lcdSetXY
.dbline 142
; i = 0;
clr R10
xjmp L31
L30:
.dbline 144
; while((ptr[i])!='\0')
; {
.dbline 145
; WriteData(ptr[i]);
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