diff options
| author | Bdale Garbee <bdale@gag.com> | 2010-11-29 21:39:15 -0700 |
|---|---|---|
| committer | Bdale Garbee <bdale@gag.com> | 2010-11-29 21:39:15 -0700 |
| commit | 6a0c85760c655e490da7b9e764f0972b11bfef90 (patch) | |
| tree | 67f46eecaede970a291cfd258f6820aebf89721d /avr/tmp/test_lcd.c | |
| parent | 0700b78dacd433d02974256a5861569b5401eeaa (diff) | |
sources from initial AVR turn-on for TeleTerrateleterra
Diffstat (limited to 'avr/tmp/test_lcd.c')
| -rw-r--r-- | avr/tmp/test_lcd.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/avr/tmp/test_lcd.c b/avr/tmp/test_lcd.c new file mode 100644 index 00000000..1f933b24 --- /dev/null +++ b/avr/tmp/test_lcd.c @@ -0,0 +1,167 @@ +/*************************************************************************
+Title: testing output to a HD44780 based LCD display.
+Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
+File: $Id: test_lcd.c,v 1.6 2004/12/10 13:53:59 peter Exp $
+Software: AVR-GCC 3.3
+Hardware: HD44780 compatible LCD text display
+ ATS90S8515/ATmega if memory-mapped LCD interface is used
+ any AVR with 7 free I/O pins if 4-bit IO port mode is used
+**************************************************************************/
+#include <stdlib.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include "lcd.h"
+
+
+/*
+** constant definitions
+*/
+static const PROGMEM unsigned char copyRightChar[] =
+{
+ 0x07, 0x08, 0x13, 0x14, 0x14, 0x13, 0x08, 0x07,
+ 0x00, 0x10, 0x08, 0x08, 0x08, 0x08, 0x10, 0x00
+};
+
+
+/*
+** function prototypes
+*/
+void wait_until_key_pressed(void);
+
+
+void wait_until_key_pressed(void)
+{
+ unsigned char temp1, temp2;
+ unsigned int i;
+
+ do {
+ temp1 = PINC; // read input
+ for(i=0;i<65535;i++);
+ temp2 = PINC; // read input
+ temp1 = (temp1 & temp2); // debounce input
+ } while ( temp1 & _BV(PINC4) );
+
+ loop_until_bit_is_set(PINC,PINC4); /* wait until key is released */
+}
+
+
+int main(void)
+{
+ char buffer[7];
+ int num=134;
+ unsigned char i;
+
+
+ DDRD &=~ (1 << PC4); /* Pin PC4 input */
+ PORTD |= (1 << PC4); /* Pin PC4 pull-up enabled */
+
+
+ /* initialize display, cursor off */
+ lcd_init(LCD_DISP_ON);
+
+ for (;;) { /* loop forever */
+ /*
+ * Test 1: write text to display
+ */
+
+ /* clear display and home cursor */
+ lcd_clrscr();
+
+ /* put string to display (line 1) with linefeed */
+ lcd_puts("LCD Test Line 1\n");
+
+ /* cursor is now on second line, write second line */
+ lcd_puts("Line 2");
+
+ /* move cursor to position 8 on line 2 */
+ lcd_gotoxy(7,1);
+
+ /* write single char to display */
+ lcd_putc(':');
+
+ /* wait until push button PD2 (INT0) is pressed */
+ wait_until_key_pressed();
+
+
+ /*
+ * Test 2: use lcd_command() to turn on cursor
+ */
+
+ /* turn on cursor */
+ lcd_command(LCD_DISP_ON_CURSOR);
+
+ /* put string */
+ lcd_puts( "CurOn");
+
+ /* wait until push button PD2 (INT0) is pressed */
+ wait_until_key_pressed();
+
+
+ /*
+ * Test 3: display shift
+ */
+
+ lcd_clrscr(); /* clear display home cursor */
+
+ /* put string from program memory to display */
+ lcd_puts_P( "Line 1 longer than 14 characters\n" );
+ lcd_puts_P( "Line 2 longer than 14 characters" );
+
+ /* move BOTH lines one position to the left */
+ lcd_command(LCD_MOVE_DISP_LEFT);
+
+ /* wait until push button PD2 (INT0) is pressed */
+ wait_until_key_pressed();
+
+ /* turn off cursor */
+ lcd_command(LCD_DISP_ON);
+
+
+ /*
+ * Test: Display integer values
+ */
+
+ lcd_clrscr(); /* clear display home cursor */
+
+ /* convert interger into string */
+ itoa( num , buffer, 10);
+
+ /* put converted string to display */
+ lcd_puts(buffer);
+
+ /* wait until push button PD2 (INT0) is pressed */
+ wait_until_key_pressed();
+
+
+ /*
+ * Test: Display userdefined characters
+ */
+
+ lcd_clrscr(); /* clear display home cursor */
+
+ lcd_puts("Copyright: ");
+
+ /*
+ * load two userdefined characters from program memory
+ * into LCD controller CG RAM location 0 and 1
+ */
+ lcd_command(_BV(LCD_CGRAM)); /* set CG RAM start address 0 */
+ for(i=0; i<16; i++)
+ {
+ lcd_data(pgm_read_byte_near(©RightChar[i]));
+ }
+
+ /* move cursor to position 0 on line 2 */
+ /* Note: this switched back to DD RAM adresses */
+ lcd_gotoxy(0,1);
+
+ /* display user defined (c), built using two user defined chars */
+ lcd_putc(0);
+ lcd_putc(1);
+
+
+ /* wait until push button PD2 (INT0) is pressed */
+ wait_until_key_pressed();
+
+ }
+}
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