Delete lay1+2 copy.c

interrupts/crc/lay1+2 copy.c

-#define F_CPU 12000000UL
-#define BAUD 9600
-
-#include <stdio.h>
-#include <stdint.h>
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <util/delay.h>
-#include <util/setbaud.h>
-#include <util/atomic.h>
-
-#include "julart.h" // Uart Functions
-#include "crc.h" //crc implementation
-
-#define ATOMIC_BLOCK(type)
-#define ATOMIC_RESTORESTATE
-#define ATOMIC_FORCEON
-
-typedef unsigned char byte;
-typedef uint32_t uint32;
-
-#define MAXFRAMESIZE 257 //in byte
-
-// Init of Send-/Receive-Buffer
-byte send[MAXFRAMESIZE]= {0}; // 0xB3, 0x10 = 10110011, 00010000
-byte frame[MAXFRAMESIZE]; // 0 - Preambel, 1 to 4 - CRC checksum, 5 - size, 6 to n (n = max. 256) - Payload
-
-byte flag = 1;
-byte bufferIndex = 0; // Zählvariable für ISR
-byte sendIndex = 0;
-byte bitIndex = 7;
-byte readyToReceive = 0;
-byte readyToSend = 0;
-
-//frame = {0b01111110, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000001, 0b10110011};
-
-void delay(int ms){
-    while(ms>0){
-	_delay_ms(1);
-	ms--;
-    }
-    return;
-}
-
-void fillSend (byte* payload, byte size){
-    //payload padden (Preambel, crc berechnung, size, rückgabe, readyToSend)
-  
-    send[0] = 0b01111110;
-
-    uint32_t checksum = crc_comp(payload, size);
-    for(int i = 1; i < 5; i++){
-        byte x = 32-i*8;
-        send[i] = (byte)((checksum & ((uint32_t)(255) << (x))) >> x);
-    }
-    send[5] = size;
-    for(int i = 6; i < size+5; i++){
-        send[i]= payload[i-6];
-    } 
-    readyToSend = 1;  
-}
-
-
-/* Funktionsdeklarationen für Interruptsetups */
-void setup_Timer();
-void setup_PinC();
-
-int main(void){
-    uart_init();
-    //Init Input-/Output-Stream
-    stdout = &uart_io;
-    stdin  = &uart_io;
-    
-    //Data Direction
-    DDRD = 0x0;
-    //PORTD = 0x10;
-    DDRB = 0x38; //(00111000) --> output at B3, B4, B5
-    
-    /* Setup Interrupt  */
-    setup_Timer();
-    setup_PinC();
-    sei(); //set SREG (one)
-    
-    byte receiveIndex = 0;
-    byte receivedFrame[MAXFRAMESIZE];
-    byte sizeToReceive = MAXFRAMESIZE;
-    
-    while(1){
-        if(!readyToSend){
-            byte sizeToSend = 2;
-            byte* payload = malloc(sizeToSend*sizeof(byte));
-            payload[0] = 0xB3;
-            payload[1] = 0x10;
-            ATOMIC_BLOCK(ATOMIC_FORCEON){
-                fillSend(payload, size);
-            }
-        }
-        ATOMIC_BLOCK(ATOMIC_FORCEON){
-            if(readyToReceive){
-                switch(receiveIndex){
-                    case 0:
-                        if(frame[receiveIndex] != 0x7E) break;
-                    case 5:
-                        sizeToReceive = receivedFrame[5];
-                        receivedFrame = realloc (receivedFrame, sizeToReceive*sizeof(byte));
-                    case (sizeToReceive-1):
-                        if(!crc_check(receivedFrame, sizeToReceive)){
-                            puts("Fehler bei der Übertragung durch CRC-Check festgestellt");
-                        }
-                        else{
-                            puts("Übertragung erfolgreich abgeschlossen.");
-                            //Hier evtl. noch Speicherung und/oder Ausgabe einbauen.
-                        }
-                        receiveIndex = 0;
-                        break;
-                    default:
-                        if(bufferIndex != 0) receivedFrame[receiveIndex] = frame[bufferIndex-1];
-                        else receivedFrame[receiveIndex] = frame[sizeToReceive-1];
-                        receiveIndex++;
-                }
-                readyToReceive = 0;
-                printf("Received: %d\n",receivedFrame[receiveIndex] );
-                
-            }
-        }
-    }  
-    return 0;
-}
-
-/*
- * Interrupt Service Routine using 16-Bit Timer
- */
- 
- ISR(TIMER1_COMPA_vect){
-     //Wenn flag gesetzt, sende Daten.
-    if(flag){
-        if(readyToSend){
-            // i-te Ziffer vom Sendebuffer wird extrahiert
-            byte bit = (send[sendIndex] & (1 << bitIndex)) >> bitIndex;    
-            if(bit) {
-                PORTB |= (1 << PB5);  //PB5 im PORTB setzen ()
-                PORTB |= (1 << PB3);   //PB3 setzen -> LED an
-            }
-            else {
-                PORTB &= ~(1 << PB5); //PB5 im PORTB loeschen
-                PORTB &= ~(1 << PB3); //PB3 löschen -> LED aus
-            }
-            if(bitIndex==0) sendIndex++;
-            if(sendIndex==send[5]+5) sendIndex=0;
-        }
-    }
-    else    PORTB ^= (1 << PB4); //Clock Signal -> Pin Change Interrupt
-    flag^=1;
-}
-
-/* 
- * Interrupt Service Routine using Pin Change
- * PCINT2 covers PCINT[16...23]
- * PCINT20 -- PD4 
- */
- 
- ISR(PCINT2_vect){
-    
-    	frame[bufferIndex] = (frame[bufferIndex] << 1) + ((PIND & (1 << PD5)) >> PD5);
-	    bitIndex--;
-	    if(bitIndex == 255) {
-            if (bufferIndex == 0 && frame[bufferIndex] != 0x7E);
-            else {
-    	        if(bufferIndex != MAXFRAMESIZE-1) bufferIndex++;
-    	        else bufferIndex = 0;
-    	        readyToReceive = 1;    
-            }
-            bitIndex=7;
-	    }
-        //frame[bufferIndex] = (frame[bufferIndex] << 1) + ((PIND & (1 << PD5)) >> PD5);
-	    //received |= (PIND & (1 << PD5)) << bitIndex;
-	    //received = (received << 1) + ((PIND & ( 1 << PD5)) >> PD5);
-	
-}
- 
- 
-/* Funktionen für das Einrichten von Interrupts */
-/* Timer Interrupt */ 
-void setup_Timer(){
-    /* Output Compare Register
-     * --> highest value can be FFFF because we have 16 bit available
-     * 
-     * OCRn =  [ (clock_speed / Prescaler_value) * Desired_time_in_Seconds ] - 1
-     *      = 12000000/256 * 0.5 - 1    
-     *      = 23436 (DEC)    
-     *      = 5B8C(HEX)
-    */
-    OCR1A = 0x5B8C;    
-    // If TCNTn == OCR1A a timer overflow occurs which can trigger an interrupt.
-    TCCR1B |= (1 << WGM12);
-    
-    // Timer/Counter Interrupt Mask Register - set on compare match
-    TIMSK1 |= (1 << OCIE1A);
-    
-    //Set prescaler to 256
-    TCCR1B |= (1 << CS12);
-}
-
-/* Pin Change Interrupt */
-void setup_PinC(){
-    // Enable checking PCMSK2 
-    PCICR |= (1 << PCIE2); 
-
-	// Clear Pin Change Interrupt Flag
-	PCIFR |= 0x7; 
-	
-	//Pin Change Interrupt enabled for Pin D4
-	PCMSK2 |= (1 <<PCINT20);
-}
-
-/*
-* Quellen:
-* ========
-* [1] https://appelsiini.net/2011/simple-usart-with-avr-libc/
-*/