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--- et:examples:digi:7seg [2009/08/17 20:07] – mikk.leini
+++ et:examples:digi:7seg [2009/11/04 13:16] (current) – eemaldatud mikk.leini
@@ Line 1: / Line 1: @@
-====== 7-segmendise numberindikaatori kasutamine ======
-{{:examples:7-seg.jpg|}}
--segment LED numberindikaator on Digitaalplaadil ühendatud läbi draiveri A6275 ({{:examples:datasheets:a6275_led_driver.pdf|datasheet}}).
-Draiver on ühendatud kontrolleri portidesse: PORTC ja PORTG vastavalt joonisele. latch PORTG2, Serial PORTC6 ja clock PORTC7.
-{{:examples:7seg_schematics.jpg?500}}
-Järgnevalt on toodud 7 segmendilise numbri indikaatori kasutamise näide. Selleks on vaja ATmega128 põhiplaadi külge lisada Studyboard. Näites kasutatakse indikaatorit läbi selleks loodud funktsioonide mida on võimalik kiirelt ka teistesse projektidesse kopeerida.
-Kasutusel on viikude operatsioonide teek mille leiad [[et:software:libraries:pin|siit]].
-<code c>
-//
-// Simple up/down counting single 7-segment digit example.
-//
-// Raivo Sell, Erki Leitaru, Mikk Leini
-//
-// 2009
-//
-// Include avrlibc
-#include <avr/io.h>
-#include <util/delay.h>
-// Include common library
-#include "pin.h"
-// Configure pins
-#define SEGMENT_DISPLAY_LATCH      PORTPIN(G, 2)
-#define SEGMENT_DISPLAY_DATA_OUT   PORTPIN(C, 6)
-#define SEGMENT_DISPLAY_CLOCK      PORTPIN(C, 7)
-//
-// 7 segment display initialization
-//
-void segment_display_init(void)
-{
-	// Set latch, data out and clock pins as output
-	pin_setup_output(SEGMENT_DISPLAY_LATCH);
-	pin_setup_output(SEGMENT_DISPLAY_DATA_OUT);
-	pin_setup_output(SEGMENT_DISPLAY_CLOCK);
-}
-//
-// Digit writing to 7 segment display
-//
-void segment_display_write(unsigned char digit)
-{
-	unsigned char map;
-	// Decimal to segment map
-	switch (digit)
-	{
-		case 0 : map = 0b00111111; break; // Every bit corresponds to one segment
-		case 1 : map = 0b00000110; break; // "1"
-		case 2 : map = 0b01011011; break; // "2"
-		case 3 : map = 0b01001111; break; // "3" and so on
-		case 4 : map = 0b01100110; break;
-		case 5 : map = 0b01101101; break;
-		case 6 : map = 0b01111100; break;
-		case 7 : map = 0b00000111; break;
-		case 8 : map = 0b01111111; break;
-		case 9 : map = 0b01100111; break;
-		default: map = 0b01111001;        // E like Error
-	}
-	// Latch low
-	pin_clear(SEGMENT_DISPLAY_LATCH);
-	// Send every bit in the byte. MSB (most significant bit) first.
-	for (signed char i = 7; i >= 0; i--)
-	{
-		// If bit is set, sets the data out pin, otherwise not
-		pin_set_to(SEGMENT_DISPLAY_DATA_OUT, IS_BIT_SET(map, i));
-		// Clock high for certain period
-		pin_set(SEGMENT_DISPLAY_CLOCK)
-		_delay_us(1);
-		// Clock low for certain period
-		pin_clear(SEGMENT_DISPLAY_CLOCK)
-		_delay_us(1);
-	}
-	// Latch high
-	pin_set(SEGMENT_DISPLAY_LATCH);
-}
-//
-// Program entrance function
-//
-int main(void)
-{
-	unsigned char digit = 0; // Digit to display on segment
-	signed char delta = 1;   // Digit modifying value
-	//digit = int (void) { return 2; };
-	// 7 segment display initialization
-	segment_display_init();
- 	// Endless loop
-	while (1)
-	{
-		// Write digit
-		segment_display_write(digit);
-		// Increase digit value by delta (which can be negative also)
-		digit += delta;
-		// Swap counting direction on 0 and 9
-		if (digit == 0) delta = +1;
-		if (digit == 9) delta = -1;
-		// Wait 1000 ms
-		_delay_ms(1000);
-	}
-}
-</code>
-Kompileeritud näide {{:examples:hex:7_seg_naide.hex|HEX}}

et/examples/digi/7seg.1250539631.txt.gz · Last modified: 2020/07/20 09:00 (external edit)