136 lines
3.1 KiB
Text
136 lines
3.1 KiB
Text
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/************************************
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* lcd-Treiber-Bibliothek f<>r Hitachi 44780 und kompatible
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* z.B. KS0070B
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*
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*/
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#include <inttypes.h>
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#include <avr/io.h>
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#include "lcd4.h"
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/* Prototypes */
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extern void wait_100us(void);
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//void lcd_init(void);
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//void lcd_write(uint8_t whichwrite, uint8_t zeichen, uint8_t position);
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void lcd_instruct(uint8_t zeichen); //Optimzation of Code length (costs one fuction call)
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// expands to lcd_write(instruct, zeichen, 0);
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// void lcd_blank_line(uint8_t lcd_whichwrite);
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void lcd_preinstruct(uint8_t zeichen); //Optimzation of Code length (costs one fuction call)
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// expands to lcd_write(preinstruct, zeichen, 0);
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// void lcd_blank_line(uint8_t lcd_whichwrite);
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// Implementation
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void lcd_5ms(void);
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void lcd_1s(void);
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/* end Prototypes */
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#define lcd_mask_Write_Adress(position) ((position & 0x7F)| lcd_SET_DD_RAM)
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// 4-Bit to be added, no indent
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// enum whichtype{instruct, data};
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void lcd_init(void){
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/* setting up ports first */
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lcd_dataport_DDR=0xff;
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lcd_dataport=0xff;
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set_lcd_RS_DDR;
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set_lcd_E_DDR;
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/* end setting up ports */
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set_lcd_RS;
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set_lcd_E;
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lcd_5ms();
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lcd_5ms();
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lcd_5ms();
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lcd_instruct(lcd_SET_FUNCTION_8BIT);
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lcd_5ms();
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lcd_instruct(lcd_SET_FUNCTION_8BIT);
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lcd_instruct(lcd_SET_FUNCTION_8BIT);
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#ifdef lcd_bus8
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lcd_preinstruct(lcd_SET_FUNCTION_8BIT|lcd_SET_FUNCTION_2LINE|lcd_SET_FUNCTION_7X5);
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#endif
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lcd_dataport_DDR|=lcd_dataport_mask;
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#ifdef lcd_bus4
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lcd_instruct(lcd_SET_FUNCTION_4BIT|lcd_SET_FUNCTION_2LINE|lcd_SET_FUNCTION_7X5);
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#endif
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lcd_5ms();
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lcd_instruct(lcd_DISPLAY_OO_ON|lcd_DISPLAY_OO_CURSOR_OFF);
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lcd_instruct(lcd_ENTRY_MODE_SET|lcd_ENTRY_MODE_SET_INCREASE | lcd_ENTRY_MS_DISPLAY_NOT_S);
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lcd_instruct(lcd_RETURN_HOME);
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lcd_5ms();
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}
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void lcd_5ms(void){
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for(uint8_t i=50;i>0;i--){
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wait_100us();
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}
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}
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void lcd_1s(void){
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for(uint8_t i=200;i>0;i--){
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lcd_5ms();
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}
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}
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void lcd_instruct(uint8_t zeichen){
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lcd_write(instruct,zeichen,0);
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}
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void lcd_preinstruct(uint8_t zeichen){
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lcd_write(preinstruct,zeichen,0);
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}
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void lcd_write(uint8_t lcd_whichwrite, uint8_t zeichen, uint8_t position){
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switch (lcd_whichwrite){
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case instruct :
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case preinstruct :
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unset_lcd_RS;
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break;
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case line2:
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case line1:
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position = position & 0x3f;
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if (lcd_whichwrite == line2){ position=position + 0x40; };
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case therepos:
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lcd_instruct(lcd_mask_Write_Adress(position));
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case here:
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set_lcd_RS;
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break;
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}
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set_lcd_E;
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asm volatile ("nop");
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lcd_dataport=( zeichen & lcd_dataport_mask);
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asm volatile ("nop");
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#ifdef lcd_bus4
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if (!(lcd_whichwrite==preinstruct)){
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unset_lcd_E;
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zeichen = zeichen << 4;
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wait_100us();
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set_lcd_E;
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asm volatile ("nop");
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lcd_dataport|=( zeichen & lcd_dataport_mask);
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asm volatile ("nop");
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}
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#endif
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unset_lcd_E;
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wait_100us();
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}
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void lcd_blank_line(uint8_t lcd_whichwrite)
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{
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uint8_t count;
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uint8_t countin;
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switch (lcd_whichwrite){
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case instruct:
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lcd_blank_line(line1);
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case line2:
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count=0x40;
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break;
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case line1:
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count=0;
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break;
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}
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for (countin=count; countin < count+15; countin++){
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lcd_write(therepos, 32, countin);
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}
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}
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