void
lcd_clear(void)
{
lcd_writecom(0x01);
delay_ms(2);
lcd_writecom(0x02);
delay_ms(2);
}
/******************************************************************************
function: void lcd_display_string(unsigned char L ,unsigned char *ptr)
introduction: display a string on singal line of LCD.
parameters:L is the display line, 0 indicates the first line, 1 indicates the second line
return value:
*******************************************************************************/
void lcd_display_string(unsigned char line_num, char *ptr, int *semaphorePtr) {
while (*semaphorePtr != 0) {delay_ms(1);}
*semaphorePtr = 2;
if (line_num==0) { //first line
lcd_writecom(0x80);
} else if (line_num==1) { //second line
lcd_writecom(0xc0);
}
while (*ptr) {
lcd_writedata(*ptr++);
}
*semaphorePtr = 0;
}
// initialize and clear the display
void lcd_init(void) {
GPIO_SET = 1<<LCD_RS_GPIO;
lcd_writecom(0x30); //wake up
lcd_writecom(0x39); //function set
lcd_writecom(0x14); //internal osc frequency
lcd_writecom(0x56); //power control
lcd_writecom(0x6D); //follower control
lcd_writecom(0x70); //contrast
lcd_writecom(0x0C); //display on
lcd_writecom(0x06); //entry mode
lcd_writecom(0x01); //clear
delay_ms(20);
}
/******************************************************************************
function: void lcd_display_string(unsigned char L ,unsigned char *ptr)
introduction: display a string on singal line of LCD.
parameters:L is the display line, 0 indicates the first line, 1 indicates the second line
return value:
*******************************************************************************/
void
lcd_display_string(unsigned char line_num, char *ptr)
{
// unsigned char i;
if(line_num==0) //first line
{
lcd_writecom(0x80);
}
else if(line_num==1) //second line
{
lcd_writecom(0xc0);
}
while (*ptr)
{
lcd_writedata(*ptr++);
}
}
