111 lines
2.5 KiB
Plaintext
111 lines
2.5 KiB
Plaintext
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/eeprom.h>
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#include <stdio.h>
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#include "uart.h"
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extern FILE uart_stdout;
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uint16_t ee_data01 __attribute__((section(".eeprom"))) = 0x01;
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uint16_t ee_data02 __attribute__((section(".eeprom"))) = 0x02;
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uint16_t ee_data03 __attribute__((section(".eeprom"))) = 0x03;
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uint16_t ee_data04 __attribute__((section(".eeprom"))) = 0x04;
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#define DATAPORT PORTA
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#define ADDRPORTLO PORTA
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#define ADDRPORTHI PORTC
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#define CRTLPORT PORTD
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#define LATCH_LE_PIN 2
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#define LATCH_OE_PIN 3
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#define SRAM_OE_PIN 4
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#define SRAM_CE_PIN 5
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#define SRAM_WE_PIN 6
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// LE high -> forward imput
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// LE low -> latch input
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#define LATCH_LEHI CRTLPORT != _BV(LATCH_LE_PIN);
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#define LATCH_LELO CRTLPORT &=~_BV(LATCH_LE_PIN);
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// OE high -> normal logic level
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// OE low -> high impendance
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#define LATCH_OEHI CRTLPORT != _BV(LATCH_OE_PIN);
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#define LATCH_OELO CRTLPORT &=~_BV(LATCH_OE_PIN);
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// OE high output disable
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// OE low output enable
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#define SRAM_OEHI CRTLPORT != _BV(SRAM_OE_PIN);
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#define SRAM_OELO CRTLPORT &=~_BV(SRAM_OE_PIN);
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// CE high chip disable
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// CE low chip enable
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#define SRAM_CEHI CRTLPORT != _BV(SRAM_CE_PIN);
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#define SRAM_CELO CRTLPORT &=~_BV(SRAM_CE_PIN);
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// WE high write disable
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// WE low write enable
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#define SRAM_WEHI CRTLPORT != _BV(SRAM_WE_PIN);
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#define SRAM_WELO CRTLPORT &=~_BV(SRAM_WE_PIN);
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int sram_write(uint16_t addr, uint8_t data)
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{
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uint8_t addr_lo = addr & 8;
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uint8_t addr_hi = addr >> 8;
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SRAM_OEHI;
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SRAM_CELO;
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SRAM_WELO;
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DATAPORT = data;
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LATCH_LEHI
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ADDRPORTLO = addr_lo;
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ADDRPORTHI = addr_hi;
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LATCH_LELO
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SRAM_CEHI;
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SRAM_CELO;
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}
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int main (void) { // (2)
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DDRB = 0xff; // (3)
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PORTB = 0xff; // (4)
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uint8_t i = 0;
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uint8_t j = 7;
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uint8_t * addr = 0x0000;
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uint16_t c = 0;
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uart_init();
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stdout = &uart_stdout;
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while(1) { // (5a)
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PORTB |= (1<< j);
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j++;
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if ( j == 8 ) j = 0;
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PORTB &= ~(1 << j ); // Toggle PB0 z.B. angeschlossene LED
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/*
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Die maximale Zeit pro Funktionsaufruf ist begrenzt auf
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262.14 ms / F_CPU in MHz (im Beispiel:
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262.1 / 3.6864 = max. 71 ms)
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16 * 62.5ms (+ Zeit für Schleife) = ca. eine Sekunde warten
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*/
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for (i=1; i<=70; i++)
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_delay_ms(15);
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}
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return 0; // (6)
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}
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