Hello,
I am using the (1.6.4) version of the Arduino IDE and also I am using a library from here and constructor U8GLIB_64128N u8g (LCD_CD, LCD_DAT, LCD_RES) on my monitor which I have matched it up to device "u8g_dev_st7565_64128n_hw_spi" on the u8glib supported devices page.
This constructor has run the included test sketches to display "hello world!" and other test sketches successfully.
I have a board based on a DUE which has thus far behaved identically and I have some buttons on the board I want to test with a my LCD monitor.
My question is how I can use the U8glib constructor with the test sketch located here to work on my Arduino Due board?
I am getting confused about renaming "lcd" to "u8g" and when this is or is not allowed. The current errors seem to want lcd changed to u8g. This code from the original sketch is commented out here. And the pins have been changed to pins which have worked with the test other test sketches.
/* YourDuino.com Example Software Sketch
TEST LCD Display with Pushbuttons
Based on code by Mark Bramwell and debouncing by peterstrobl
terry@yourduino.com */
/*-----( Import needed libraries )-----*/
//#include <LiquidCrystal.h>
#include "U8glib.h"
#define LCD_DAT 63 // data / instruction register select
#define LCD_RES 51 // reset
#define LCD_CS 50 // chip select
U8GLIB_64128N u8g(50, 63, 51);
/*-----( Declare objects )-----*/
//LiquidCrystal lcd(8, 9, 4, 5, 6, 7); //These are the pins used on this shield
/*-----( Declare Constants )-----*/
#define btnRIGHT 71
#define btnUP 23
#define btnDOWN 24
#define btnLEFT 70
#define btnSELECT 42
#define btnNONE 43
/*-----( Declare Variables )-----*/
int lcd_key = 0;
int adc_key_in = 0;
int adc_key_prev = 0;
void setup() /*----( SETUP: RUNS ONCE )----*/
{
u8g.setFont(u8g_font_unifont);
u8g.setColorIndex(1);
lcd.begin(16, 2); // start the lcd object
lcd.setCursor(0,0);
lcd.print("Push A Button!");
lcd.setCursor(10,1);
lcd.print("A="); // For display of A0 Analog values from button push
}/*--(end setup )---*/
void loop() /*----( LOOP: RUNS CONSTANTLY )----*/
{
lcd.setCursor(7,1); // move cursor to second line "1" and 7 spaces over
lcd.print(millis()/1000); // display seconds elapsed since power-up
adc_key_prev = lcd_key ; // Looking for changes
lcd_key = read_LCD_buttons(); // read the buttons
if (adc_key_prev != lcd_key)
{
lcd.setCursor(12,1);
lcd.print(" "); // Blank, display returned Analog value of button
lcd.setCursor(12,1);
lcd.print(adc_key_in);
}
lcd.setCursor(0,1); // move to the begining of the second line
switch (lcd_key) // depending on which button was pushed, we perform an action
{
case btnRIGHT:
{
lcd.print("RIGHT ");
break;
}
case btnLEFT:
{
lcd.print("LEFT ");
break;
}
case btnUP:
{
lcd.print("UP ");
break;
}
case btnDOWN:
{
lcd.print("DOWN ");
break;
}
case btnSELECT:
{
lcd.print("SELECT");
break;
}
case btnNONE:
{
lcd.print("NONE ");
break;
}
}/* --(end switch )-- */
}/* --(end main loop )-- */
/*-----( Declare User-written Functions )-----*/
int read_LCD_buttons()
{
adc_key_in = analogRead(0); // read the value from the sensor
delay(5); //switch debounce delay. Increase this delay if incorrect switch selections are returned.
int k = (analogRead(0) - adc_key_in); //gives the button a slight range to allow for a little contact resistance noise
if (5 < abs(k)) return btnNONE; // double checks the keypress. If the two readings are not equal +/-k value after debounce delay, it tries again.
// my buttons when read are centered at these valies: 0, 144, 329, 504, 741
// we add approx 50 to those values and check to see if we are close
if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
if (adc_key_in < 50) return btnRIGHT;
if (adc_key_in < 195) return btnUP;
if (adc_key_in < 380) return btnDOWN;
if (adc_key_in < 555) return btnLEFT;
if (adc_key_in < 790) return btnSELECT;
return btnNONE; // when all others fail, return this...
}
My error messages
Arduino: 1.6.4 (Windows 8), Board: "Arduino Due (Native USB Port)"
sketch_dec16a.ino: In function 'void setup()':
sketch_dec16a:36: error: 'lcd' was not declared in this scope
sketch_dec16a.ino: In function 'void loop()':
sketch_dec16a:48: error: 'lcd' was not declared in this scope
Multiple libraries were found for "U8glib.h"
Used: C:\Users\Javier\Documents\Arduino\libraries\U8glib
Not used: C:\Users\Javier\Documents\Arduino\libraries\arduino_95561
'lcd' was not declared in this scope
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
Any help would be appreciated, Thank you!