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📄 lcd1602.s

📁 LCD1602液晶屏的四线驱动模块
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	.module lcd1602.c
	.area text(rom, con, rel)
	.dbfile D:\MYJOB~1\AVR资料\示例程序\DS1302-LCD1602-4bitBUS\lcd1602.c
	.dbfunc e delay_us _delay_us fV
;              n -> R16,R17
	.even
_delay_us::
	.dbline -1
	.dbline 24
; /*
; 	LCD1602液晶屏四线驱动模块
; 	1、可直接嵌入到项目中使用
; 	2、晶振频率：1M
; 	3、如晶振提高低层驱动延时要作相应修改
; 	4、程序在原来基础上只使用了PB口的高四位，即PB4—PB7，PB0—PB3可以做它用
; 
; 	SunnyTrip
; 	www.iccavr.com
; */
; 
; #include <iom16v.h>
; 
; #define RS_CLR	PORTD &= ~(1 << PD3)
; #define RS_SET	PORTD |= (1 << PD3)
; 
; #define RW_CLR	PORTD &= ~(1 << PD4)
; #define RW_SET	PORTD |= (1 << PD4)
; 
; #define EN_CLR	PORTD &= ~(1 << PD6)
; #define EN_SET	PORTD |= (1 << PD6)
; 
; /*延时函数*/
; void delay_us(unsigned int n) {
	.dbline 26
; 
; 	if (n == 0) {
	cpi R16,0
	cpc R16,R17
	brne L5
X0:
	.dbline 26
	.dbline 27
; 		return ;
	xjmp L1
L4:
	.dbline 29
L5:
	.dbline 29
; 		}
; 	while (--n);
	movw R24,R16
	sbiw R24,1
	movw R16,R24
	cpi R16,0
	cpc R16,R17
	brne L4
X1:
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbsym r n 16 i
	.dbend
	.dbfunc e delay_ms _delay_ms fV
;              a -> R20
;              b -> R22
;              i -> R16
	.even
_delay_ms::
	xcall push_gset2
	.dbline -1
	.dbline 33
; }
; 
; /*延时函数*/
; void delay_ms(unsigned char i) {
	.dbline 36
	ldi R20,1
	xjmp L11
L8:
	.dbline 36
; 
; 	unsigned char a, b;
; 	for (a = 1; a < i; a++) {
	.dbline 37
	ldi R22,1
	xjmp L15
L12:
	.dbline 37
	.dbline 38
	.dbline 39
L13:
	.dbline 37
	inc R22
L15:
	.dbline 37
	tst R22
	brne L12
	.dbline 40
L9:
	.dbline 36
	inc R20
L11:
	.dbline 36
	cp R20,R16
	brlo L8
	.dbline -2
L7:
	xcall pop_gset2
	.dbline 0 ; func end
	ret
	.dbsym r a 20 c
	.dbsym r b 22 c
	.dbsym r i 16 c
	.dbend
	.dbfunc e LCD_write_com _LCD_write_com fV
;            com -> R20
	.even
_LCD_write_com::
	xcall push_gset1
	mov R20,R16
	.dbline -1
	.dbline 44
; 		for (b = 1; b; b++) {
; 			;
; 			}
; 		}
; }
; 
; /*显示屏命令写入函数*/
; void LCD_write_com(unsigned char com) {
	.dbline 46
; 	
; 	RS_CLR;
	cbi 0x12,3
	.dbline 47
; 	RW_CLR;
	cbi 0x12,4
	.dbline 48
; 	EN_SET;
	sbi 0x12,6
	.dbline 49
; 	PORTB&=0x0f;
	in R24,0x18
	andi R24,15
	out 0x18,R24
	.dbline 50
; 	PORTB|= com&0xf0;
	mov R24,R20
	andi R24,240
	in R2,0x18
	or R2,R24
	out 0x18,R2
	.dbline 51
; 	com = com<<4;
	mov R24,R20
	andi R24,#0x0F
	swap R24
	mov R20,R24
	.dbline 52
; 	EN_CLR;
	cbi 0x12,6
	.dbline 53
; 	delay_us(1);
	ldi R16,1
	ldi R17,0
	xcall _delay_us
	.dbline 54
; 	EN_SET;
	sbi 0x12,6
	.dbline 55
; 	PORTB&=0x0f;
	in R24,0x18
	andi R24,15
	out 0x18,R24
	.dbline 56
; 	PORTB|= com&0xf0;
	mov R24,R20
	andi R24,240
	in R2,0x18
	or R2,R24
	out 0x18,R2
	.dbline 57
; 	EN_CLR;
	cbi 0x12,6
	.dbline 58
; 	delay_us(1);
	ldi R16,1
	ldi R17,0
	xcall _delay_us
	.dbline -2
L16:
	xcall pop_gset1
	.dbline 0 ; func end
	ret
	.dbsym r com 20 c
	.dbend
	.dbfunc e LCD_write_data _LCD_write_data fV
;           data -> R20
	.even
_LCD_write_data::
	xcall push_gset1
	mov R20,R16
	.dbline -1
	.dbline 62
; }
; 
; /*显示屏命令写入函数*/
; void LCD_write_data(unsigned char data) {
	.dbline 64
; 
; 	RS_SET;
	sbi 0x12,3
	.dbline 65
; 	RW_CLR;
	cbi 0x12,4
	.dbline 66
; 	EN_SET;
	sbi 0x12,6
	.dbline 67
; 	PORTB&=0x0f;
	in R24,0x18
	andi R24,15
	out 0x18,R24
	.dbline 68
; 	PORTB|= data&0xf0;
	mov R24,R20
	andi R24,240
	in R2,0x18
	or R2,R24
	out 0x18,R2
	.dbline 69
; 	data = data<<4;
	mov R24,R20
	andi R24,#0x0F
	swap R24
	mov R20,R24
	.dbline 70
; 	EN_CLR;
	cbi 0x12,6
	.dbline 71
; 	delay_us(1);
	ldi R16,1
	ldi R17,0
	xcall _delay_us
	.dbline 72
; 	EN_SET;
	sbi 0x12,6
	.dbline 73
; 	PORTB&=0x0f;
	in R24,0x18
	andi R24,15
	out 0x18,R24
	.dbline 74
; 	PORTB|= data&0xf0;
	mov R24,R20
	andi R24,240
	in R2,0x18
	or R2,R24
	out 0x18,R2
	.dbline 75
; 	EN_CLR;
	cbi 0x12,6
	.dbline -2
L17:
	xcall pop_gset1
	.dbline 0 ; func end
	ret
	.dbsym r data 20 c
	.dbend
	.dbfunc e LCD_clear _LCD_clear fV
	.even
_LCD_clear::
	.dbline -1
	.dbline 79
; }
; 
; /*显示屏清空显示*/
; void LCD_clear(void) {
	.dbline 81
; 
; 	LCD_write_com(0x01);
	ldi R16,1
	xcall _LCD_write_com
	.dbline 82
; 	delay_ms(5);
	ldi R16,5
	xcall _delay_ms
	.dbline -2
L18:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e LCD_write_str _LCD_write_str fV
;              s -> R20,R21
;              y -> R10
;              x -> R22
	.even
_LCD_write_str::
	xcall push_gset3
	mov R10,R18
	mov R22,R16
	ldd R20,y+6
	ldd R21,y+7
	.dbline -1
	.dbline 86
; }
; 
; /*显示屏字符串写入函数*/
; void LCD_write_str(unsigned char x,unsigned char y,unsigned char *s) {
	.dbline 88
; 	
;     if (y == 0) {
	tst R10
	brne L20
	.dbline 88
	.dbline 89
;     	LCD_write_com(0x80 + x);
	mov R16,R22
	subi R16,128    ; addi 128
	xcall _LCD_write_com
	.dbline 90
;     	}
	xjmp L23
L20:
	.dbline 91
;     else {
	.dbline 92
;     	LCD_write_com(0xC0 + x);
	mov R16,R22
	subi R16,64    ; addi 192
	xcall _LCD_write_com
	.dbline 93
;     	}
	xjmp L23
L22:
	.dbline 95
	.dbline 96
	movw R30,R20
	ldd R16,z+0
	xcall _LCD_write_data
	.dbline 97
	subi R20,255  ; offset = 1
	sbci R21,255
	.dbline 98
L23:
	.dbline 95
;     
;     while (*s) {
	movw R30,R20
	ldd R2,z+0
	tst R2
	brne L22
	.dbline -2
L19:
	xcall pop_gset3
	.dbline 0 ; func end
	ret
	.dbsym r s 20 pc
	.dbsym r y 10 c
	.dbsym r x 22 c
	.dbend
	.dbfunc e LCD_write_char _LCD_write_char fV
;           data -> y+4
;              y -> R22
;              x -> R20
	.even
_LCD_write_char::
	xcall push_gset2
	mov R22,R18
	mov R20,R16
	.dbline -1
	.dbline 102
;     	LCD_write_data( *s);
;     	s ++;
;     	}
; }
; 
; /*显示屏单字符写入函数*/
; void LCD_write_char(unsigned char x,unsigned char y,unsigned char data) {
	.dbline 104
; 	
;     if (y == 0) {
	tst R22
	brne L26
	.dbline 104
	.dbline 105
;     	LCD_write_com(0x80 + x);
	mov R16,R20
	subi R16,128    ; addi 128
	xcall _LCD_write_com
	.dbline 106
;     	}
	xjmp L27
L26:
	.dbline 107
;     else {
	.dbline 108
;     	LCD_write_com(0xC0 + x);
	mov R16,R20
	subi R16,64    ; addi 192
	xcall _LCD_write_com
	.dbline 109
;     	}
L27:
	.dbline 111
;     
;     LCD_write_data( data);  
	ldd R16,y+4
	xcall _LCD_write_data
	.dbline -2
L25:
	xcall pop_gset2
	.dbline 0 ; func end
	ret
	.dbsym l data 4 c
	.dbsym r y 22 c
	.dbsym r x 20 c
	.dbend
	.dbfunc e LCD_init _LCD_init fV
	.even
_LCD_init::
	.dbline -1
	.dbline 115
; }
; 
; /*显示屏初始化函数*/
; void LCD_init(void) {
	.dbline 117
; 	
; 	DDRB = 0xFF;						/*I/O口方向设置*/
	ldi R24,255
	out 0x17,R24
	.dbline 118
; 	DDRD |= (1 << PD3) | (1 << PD4) | (1 << PD6);
	in R24,0x11
	ori R24,88
	out 0x11,R24
	.dbline 119
; 	LCD_write_com(0x28);				/*显示模式设置*/
	ldi R16,40
	xcall _LCD_write_com
	.dbline 120
; 	delay_ms(15);
	ldi R16,15
	xcall _delay_ms
	.dbline 121
; 	LCD_write_com(0x28);
	ldi R16,40
	xcall _LCD_write_com
	.dbline 122
; 	delay_ms(5);
	ldi R16,5
	xcall _delay_ms
	.dbline 123
; 	LCD_write_com(0x28);
	ldi R16,40
	xcall _LCD_write_com
	.dbline 124
; 	delay_ms(5);
	ldi R16,5
	xcall _delay_ms
	.dbline 125
; 	LCD_write_com(0x28);
	ldi R16,40
	xcall _LCD_write_com
	.dbline 127
; 	
; 	LCD_write_com(0x08);				/*显示关闭*/
	ldi R16,8
	xcall _LCD_write_com
	.dbline 128
; 	LCD_write_com(0x01);				/*显示清屏*/
	ldi R16,1
	xcall _LCD_write_com
	.dbline 129
; 	LCD_write_com(0x06);				/*显示光标移动设置*/
	ldi R16,6
	xcall _LCD_write_com
	.dbline 130
; 	delay_ms(5);
	ldi R16,5
	xcall _delay_ms
	.dbline 131
; 	LCD_write_com(0x0C);				/*显示开及光标设置*/
	ldi R16,12
	xcall _LCD_write_com
	.dbline -2
L28:
	.dbline 0 ; func end
	ret
	.dbend

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