/**
Wrtie some text on screen
**/
void lcd_text(char *s)
{
SetChrMode();
while(*s)
lcd_byte(*s++);
SetCmdMode();
}
void lcd_text(mraa_gpio_context *g, char *s, int line)
{
SetCmdMode(g); // set to cmd mode to send line cmd
if(line == 1)
lcd_byte(g, 0x80); // line 1
else
lcd_byte(g, 0xC0); // line 2
SetChrMode(g); // set to char mode to send text
while(*s)
lcd_byte(g, *s++);
}
/**
* This method is called periodically to have the display in a correct state
no matter the random interference that could happen from time to time.
**/
void resetLcd(){
#ifndef PROD
printf("Reset LCD\n");
#endif
SetCmdMode(); // set for commands
lcd_byte(0x0C); // display on, cursor off, blink off
lcd_byte(0x01); // clear screen
delay(10); // clear screen is slow!
}
int main (int argc, char *argv [])
{
lcd_init();
SetChrMode();
lcd_text("hello world!");
SetCmdMode();
lcd_gotoxy(1,2);
SetChrMode();
lcd_text("Luis");
return 0 ;
}
/**
Init the screen
**/
void lcd_init()
{
#ifndef PROD
printf("Full reset LCD\n");
#endif
SetCmdMode(); // set for commands
lcd_byte(0x33); // full init
lcd_byte(0x32); // 4 bit mode
lcd_byte(0x28); // 2 line mode
lcd_byte(0x0C); // display on, cursor off, blink off
lcd_byte(0x01); // clear screen
delay(10); // clear screen is slow!
}
void lcd_init()
{
wiringPiSetup() ; // use BCIM numbering
// set up pi pins for output
pinMode (LCD_E, OUTPUT);
pinMode (LCD_RS, OUTPUT);
pinMode (LCD_D4, OUTPUT);
pinMode (LCD_D5, OUTPUT);
pinMode (LCD_D6, OUTPUT);
pinMode (LCD_D7, OUTPUT);
// initialise LCD
SetCmdMode(); // set for commands
lcd_byte(0x33); // full init
lcd_byte(0x32); // 4 bit mode
lcd_byte(0x28); // 2 line mode
lcd_byte(0x0C); // display on, cursor off, blink off
lcd_byte(0x01); // clear screen
delay(3); // clear screen is slow!
}
void lcd_init(mraa_gpio_context *g)
{
// set up pi pins for output
g[0] = mraa_gpio_init(LCD_E);
g[1] = mraa_gpio_init(LCD_RS);
g[2] = mraa_gpio_init(LCD_D4);
g[3] = mraa_gpio_init(LCD_D5);
g[4] = mraa_gpio_init(LCD_D6);
g[5] = mraa_gpio_init(LCD_D7);
for(int i = 0; i < 6; i++) {
mraa_gpio_dir(g[i], MRAA_GPIO_OUT);
}
// initialise LCD
SetCmdMode(g); // set for commands
lcd_byte(g,0x33); // 2 line mode
lcd_byte(g,0x32); // 2 line mode
lcd_byte(g,0x06); // 2 line mode
lcd_byte(g,0x0C); // 2 line mode
lcd_byte(g,0x28); // display on, cursor off, blink off
lcd_byte(g,0x01); // clear screen
usleep(3000); // clear screen is slow!
SetChrMode(g);
}
/*
Return at the begining of the line
*/
void goHome(){
SetCmdMode(); // set for commands
lcd_byte(lcd_Home); // go home screen
delay(7); // You cannot write directly after putting the cursor at the
//beginning of the line. You have to wait for some time before it
}
