With a 595 shift register shifting one wire lcd.
1wire_lcd.cpp
- Committer:
- ahmetunal
- Date:
- 2011-02-22
- Revision:
- 0:9245c05647c9
File content as of revision 0:9245c05647c9:
#include "1wire_lcd.h" #include "mbed.h" DigitalOut wire(p21); void one_wire(unsigned char data) { char i; wire=1; for(i=0;i < 8;i++) { if((data<<(i))&0x80) { wire=0; wire=1; } else { wire=0; wait_us(15); wire=1; wait_us(30); } } wire=0; wait_us(210); wire=1; wait_us(300); } void lcd_putc(unsigned char c) { unsigned char data; data = 0x00; data |=0x50; one_wire(data); data |= ((c & 0xF0)>>4); one_wire(data); data &= 0x1F; one_wire(data); wait_us(100); data = 0x00; data |= 0x50; one_wire(data); data |= (((c & 0x0F) << 4) >> 4); one_wire(data); data &= 0x1F; one_wire(data); wait_us(100); } void lcd_command(unsigned char c) { unsigned char data; data = 0x00; data |=0x40; one_wire(data); data |= ((c & 0xF0)>>4); one_wire(data); data &= 0x0F; one_wire(data); wait_us(100); data = 0x00; data |= 0x40; one_wire(data); data |= (((c & 0x0F) << 4) >> 4); one_wire(data); data &= 0x0F; one_wire(data); wait_us(100); } void lcd_clear(void) { lcd_command(0x1); wait_ms(2); } void lcd_position(unsigned char x,unsigned char y) { if(x==1) lcd_command(0x80+((y-1)%20)); else lcd_command(0xC0+((y-1)%20)); } void lcd_printf(const char * a) { wait_us(100); while(*a) lcd_putc(*a++); } void lcd_init() { one_wire(0); wait_ms(15); lcd_command(0x02); wait_ms(2); lcd_command(40); //2line 4bit lcd_command(6); //write right lcd_command(12); //pointer hidden lcd_clear(); lcd_command(128); //first line }