Unitech PT630, Programming Reference Manual

Page: 18 / 73

PT630 Programming Reference Guide Page 18 of 59
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1.5.12 Device control function
1.5.12.1 LCD Backlight ON/OFF Control
Entry Parameter: AH = 1AH
BH = 0
AL = 0/1 ; set LCD backlight OFF/ON
Return Value: None
Example :
void TL_backlight(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 0;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1.5.12.2 Buzzer ON/OFF Control
Entry Parameter: AH = 1AH
BH = 1
AL = 0/1 ; set Buzzer OFF/ON
Return Value: None
Example :
void TD_buzzer(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 1;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1.5.12.3 Beeper Volume
Entry parameter: AH = 1AH
BH = 3
AL = 0/1/2 ; set LOW/MEDIUM/HIGH beeper volume
Return Value: None
Example :
void TD_beeper_vol(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 3;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}