317 lines
8.7 KiB
C
317 lines
8.7 KiB
C
#include "lcd_headers.h"
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// задержеки через асемблер
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#define lcd_e_delay() __asm__ __volatile__( "rjmp 1f\n 1:" );
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#define lcd_e_toggle() toggle_e()
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volatile uint8_t dataport = 0;
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static void toggle_e(void);
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// сама реализация задержек
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static inline void _delayFourCycles(unsigned int __count)
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{
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if ( __count == 0 )
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__asm__ __volatile__( "rjmp 1f\n 1:" );
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else
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__asm__ __volatile__ (
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"1: sbiw %0,1" "\n\t"
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"brne 1b"
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: "=w" (__count)
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: "0" (__count)
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);
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}
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// тупа оборачиваем функцию в макрос
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#define delay(us) _delayFourCycles( ( ( 1*(F_CPU/4000) )*us)/1000 )
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// переключение пина для начала записи команды
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static void toggle_e(void)
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{
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pcf8574_setoutputpinhigh(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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lcd_e_delay();
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pcf8574_setoutputpinlow(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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}
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// отправка байта для контроллера LCD
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static void lcd_write(uint8_t data,uint8_t rs)
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{
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if (rs) //отправка данных (RS=1, RW=0)
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dataport |= _BV(LCD_RS_PIN);
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else // отпрака инструкций(RS=0, RW=0)
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dataport &= ~_BV(LCD_RS_PIN);
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dataport &= ~_BV(LCD_RW_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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// отправка старшего полубайта
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dataport &= ~_BV(LCD_DATA3_PIN);
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dataport &= ~_BV(LCD_DATA2_PIN);
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dataport &= ~_BV(LCD_DATA1_PIN);
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dataport &= ~_BV(LCD_DATA0_PIN);
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if(data & 0x80) dataport |= _BV(LCD_DATA3_PIN);
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if(data & 0x40) dataport |= _BV(LCD_DATA2_PIN);
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if(data & 0x20) dataport |= _BV(LCD_DATA1_PIN);
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if(data & 0x10) dataport |= _BV(LCD_DATA0_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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lcd_e_toggle();
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// отправка младшего полубайта
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dataport &= ~_BV(LCD_DATA3_PIN);
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dataport &= ~_BV(LCD_DATA2_PIN);
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dataport &= ~_BV(LCD_DATA1_PIN);
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dataport &= ~_BV(LCD_DATA0_PIN);
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if(data & 0x08) dataport |= _BV(LCD_DATA3_PIN);
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if(data & 0x04) dataport |= _BV(LCD_DATA2_PIN);
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if(data & 0x02) dataport |= _BV(LCD_DATA1_PIN);
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if(data & 0x01) dataport |= _BV(LCD_DATA0_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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lcd_e_toggle();
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// завершаем передачу
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dataport |= _BV(LCD_DATA0_PIN);
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dataport |= _BV(LCD_DATA1_PIN);
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dataport |= _BV(LCD_DATA2_PIN);
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dataport |= _BV(LCD_DATA3_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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}
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// чтение байта
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static uint8_t lcd_read(uint8_t rs)
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{
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uint8_t data;
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if (rs) // запись данных (RS=1, RW=0)
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dataport |= _BV(LCD_RS_PIN);
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else // запись инструкций (RS=0, RW=0)
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dataport &= ~_BV(LCD_RS_PIN);
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dataport |= _BV(LCD_RW_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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pcf8574_setoutputpinhigh(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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lcd_e_delay();
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// чтение страшего полубайта
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data = pcf8574_getoutputpin(LCD_PCF8574_DEVICEID, LCD_DATA0_PIN) << 4;
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pcf8574_setoutputpinlow(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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lcd_e_delay();
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pcf8574_setoutputpinhigh(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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lcd_e_delay();
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// чтение младшего полубайта
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data |= pcf8574_getoutputpin(LCD_PCF8574_DEVICEID, LCD_DATA0_PIN) &0x0F;
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pcf8574_setoutputpinlow(LCD_PCF8574_DEVICEID, LCD_E_PIN);
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return data;
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}
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// ждем пока ЖК освободится
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static uint8_t lcd_waitbusy(void)
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{
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register uint8_t c;
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// ждем
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while ( (c=lcd_read(0)) & (1<<LCD_BUSY)) {}
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// задержка
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delay(2);
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// получаем адрес
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return (lcd_read(0));
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}
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// перемещение курсора по строкам
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static inline void lcd_newline(uint8_t pos)
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{
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register uint8_t addressCounter;
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#if LCD_LINES==1
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addressCounter = 0;
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#endif
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#if LCD_LINES==2
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if ( pos < (LCD_START_LINE2) )
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addressCounter = LCD_START_LINE2;
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else
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addressCounter = LCD_START_LINE1;
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#endif
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#if LCD_LINES==4
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if ( pos < LCD_START_LINE3 )
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addressCounter = LCD_START_LINE2;
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else if ( (pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4) )
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addressCounter = LCD_START_LINE3;
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else if ( (pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2) )
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addressCounter = LCD_START_LINE4;
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else
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addressCounter = LCD_START_LINE1;
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#endif
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lcd_command((1<<LCD_DDRAM)+addressCounter);
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}
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// служебная функция для отправки команд дисплею
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void lcd_command(uint8_t cmd)
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{
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lcd_waitbusy();
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lcd_write(cmd,0);
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}
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// отправка байта на дисплей
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void lcd_data(uint8_t data)
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{
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lcd_waitbusy();
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lcd_write(data,1);
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}
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// перемещение курсора по координатам
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void lcd_gotoxy(uint8_t x, uint8_t y)
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{
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#if LCD_LINES==1
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
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#endif
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#if LCD_LINES==2
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if ( y==0 )
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
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else
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
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#endif
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#if LCD_LINES==4
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if ( y==0 )
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
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else if ( y==1)
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
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else if ( y==2)
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE3+x);
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else
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lcd_command((1<<LCD_DDRAM)+LCD_START_LINE4+x);
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#endif
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}
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// тырим координаты
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int lcd_getxy(void)
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{
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return lcd_waitbusy();
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}
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// очистка дисплея
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void lcd_clrscr(void)
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{
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lcd_command(1<<LCD_CLR);
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}
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// вкл и откл подсветки
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void lcd_led(uint8_t onoff)
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{
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if(onoff)
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dataport &= ~_BV(LCD_LED_PIN);
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else
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dataport |= _BV(LCD_LED_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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}
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// курсов в начало координат
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void lcd_home(void)
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{
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lcd_command(1<<LCD_HOME);
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}
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// отображение символа в текущей позиции курсора
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void lcd_putc(char c)
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{
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uint8_t pos;
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pos = lcd_waitbusy();
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if (c=='\n')
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{
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lcd_newline(pos);
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}
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else
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{
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#if LCD_WRAP_LINES==1
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#if LCD_LINES==1
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if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
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}
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#elif LCD_LINES==2
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if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);
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}else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ){
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
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}
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#elif LCD_LINES==4
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if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);
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}else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE3,0);
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}else if ( pos == LCD_START_LINE3+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE4,0);
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}else if ( pos == LCD_START_LINE4+LCD_DISP_LENGTH ) {
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lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
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}
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#endif
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lcd_waitbusy();
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#endif
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lcd_write(c, 1);
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}
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}
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// вывод строки на дисплей
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void lcd_puts(const char *s)
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{
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register char c;
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while ( (c = *s++) ) {
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lcd_putc(c);
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}
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}
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// вывод строки из памяти
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void lcd_puts_p(const char *progmem_s)
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{
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register char c;
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while ( (c = pgm_read_byte(progmem_s++)) ) {
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lcd_putc(c);
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}
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}
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// инициализация дисплея
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void lcd_init(uint8_t dispAttr)
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{
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#if LCD_PCF8574_INIT == 1
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//инициализация pcf
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pcf8574_init();
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#endif
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dataport = 0;
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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delay(16000);
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// первоначальная запись на ЖК-дисплей — 8 бит
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dataport |= _BV(LCD_DATA1_PIN); // _BV(LCD_FUNCTION)>>4;
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dataport |= _BV(LCD_DATA0_PIN); // _BV(LCD_FUNCTION_8BIT)>>4;
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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// дрючим дисплей чтобы он начал работать
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lcd_e_toggle();
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delay(4992);
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lcd_e_toggle();
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delay(64);
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lcd_e_toggle();
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delay(64);
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// переходим в 4 битный режим
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dataport &= ~_BV(LCD_DATA0_PIN);
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pcf8574_setoutput(LCD_PCF8574_DEVICEID, dataport);
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lcd_e_toggle();
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delay(64);
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lcd_command(LCD_FUNCTION_DEFAULT); // настраиваем кол-во строк
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lcd_command(LCD_DISP_OFF); // вырубаем дисплей
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lcd_clrscr(); // чистим экран
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lcd_command(LCD_MODE_DEFAULT); // запускаемся в стандартном режиме
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lcd_command(dispAttr); // отправляем настройки
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}
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