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Код: Выделить всё

if (SG.flag==1)
		{
		GICR|=(1<<INT0);//set external interrupt to enable stop
		if (SG.mode==7)
			{
			//Noise
			do
			{
				R2RPORT=rand();               //                Генерация шума!!!!!!!!!
			}while(SG.flag==1);
			//set signal level to 0
			R2RPORT=0x00;
			//display generator OFF
			Menu_Update(SG.ON);
			//stop external interrupt
			GICR&=~(1<<INT0);
			//start timer menu active
			Timer2_Start();
			}

Код: Выделить всё

//Device: ATmega16 @ 16MHz
#include <avr/io.h>
#include <avr/interrupt.h>

#define ST_IDLE			0
#define ST_RCV_BUFFER	1

#define CMD_FWD_BUFFER	1
#define CMD_START_OUT	 2
#define CMD_STOP_OUT	  3

volatile char wfm[255],status=ST_IDLE;

int wfmidx=0;

void ClearWfm(void)
{
  int i;

  for (i=0; i<255; i++)
    wfm[i]=0;

  wfmidx=0;
}

ISR (TIMER1_COMPA_vect)
{
  PORTA=wfm[wfmidx];

  ++wfmidx;

  if (wfmidx==255)
    wfmidx=0;
}

ISR (USART_RXC_vect)
{
  char v_udr=UDR;
  
  if (status==ST_IDLE) //understanding byte as command
  {
    if (v_udr==CMD_FWD_BUFFER) //PC is going to transmit a waveform buffer
	{
	  ClearWfm();
	  status=ST_RCV_BUFFER;
    }

    if (v_udr==CMD_START_OUT) //Starting timer, which controls DAC
	  TCCR1B=(1<<CS10);

	if (v_udr==CMD_STOP_OUT) //Stopping timer
	  TCCR1B=0;
  }
  
  if (status==ST_RCV_BUFFER) //if buffer reception is in progress
  {
    wfm[wfmidx]=v_udr;

	++wfmidx;

	if (wfmidx==255) //buffer is full, waiting for a next command
              {
	  status=ST_IDLE;
                wfmidx=0;
              }
  } 
}

void main(void)
{
  //port setup - connect R-2R DAC to portA
  DDRA=0xFF;
  PORTA=0;

  //UART setup: 8-N-1 @ 76800bps

  UCSRB=(1<<RXCIE) | (1<<RXEN);
  UBRRL=12;

  // T/C1 setup - enabling timer 1 interrupt on compare match
  //and setting OC1 value
  TIMSK=OCIE1A;
  OCR1A=0x0190;

  ClearWfm();

  sei();

  while (1);
}

Код: Выделить всё

.include "m16def.inc" // файл определений atmega_16
.CSEG
         .ORG $000        ; (RESET) 
         RJMP   Reset
         .ORG $016
         RJMP   RX_OK     ; (USART,RXC) USART, Rx Complete
.ORG   INT_VECTORS_SIZE      	; Конец таблицы прерываний

      
.org 0x050 
.def temp1=r16 
start:
//------указатель адреса стека---------
reset:
ldi R16,low(ramend)
out spl,R16
ldi R16,high(ramend)
out sph,R16
//------------------------------------

//------настройка ввод/вывод----------
    ldi     r16, 0xFF
    out     DDRa, r16    ;порт А на вывод
   

//------------------------------------
;USART initializationUCSRA 7 11
;Communication Parameters: 8 Data, 1 Stop, Even Parity
;USART Receiver: On
;USART Transmitter: On
;USART Mode: Asynchronous
;USART Baud Rate: 9600
 
uart_init:	LDI 	R16, $00
		OUT 	UBRRH,R16
		LDI 	R16, $33
		OUT 	UBRRL,R16
 		LDI 	R16,$25
		OUT 	UCSRC, R16
		LDI 	R16,$00
		OUT 	UCSRA, R16
		LDI 	R16,$98
		OUT 	UCSRB, R16
		sei ; Включить глобальных прерываний
	; тело программы
		loop:
     	rjmp loop



;Обработка прерывания по окончании приема байта
 
RX_OK:  PUSH	R16
		IN	R16,SREG
		PUSH	R16
 
		IN	R16,UCSRA	;Читаем статус из UCSRA
		IN	R17,UDR		;Читаем данные из UDR
		ANDI 	R16,$1C
		BREQ	_END	;Проверяем на ошибки
		CLR  	R17
 _END:
 					    ;в R17 находится принятый байт
		POP	R16
		OUT	SREG,R16
		POP	R16
		out porta,r17
		RETI

Код: Выделить всё

//Device: ATmega16 @ 16MHz
#include <avr/io.h>
#include <avr/interrupt.h>

#define ST_IDLE         0
#define ST_RCV_BUFFER   1

#define CMD_FWD_BUFFER   1
#define CMD_START_OUT    2
#define CMD_STOP_OUT     3

volatile char wfm[255];

int wfmidx=0;


ISR (TIMER1_COMPA_vect)
{
  PORTA=wfm[wfmidx];

  wfmidx=wfmidx+1;

  if (wfmidx==255)
    wfmidx=0;
}


ISR (USART_RXC_vect)
{
  char v_udr=UDR;
      wfm[wfmidx]=v_udr;

   wfmidx=wfmidx+1;

   if (wfmidx==255) //buffer is full, waiting for a next command
                
     TCCR1B=(1<<CS10);
			   
              
   
}

void main(void)
{
  //port setup - connect R-2R DAC to portA
  DDRA=0xFF;
  PORTA=0;
  
   //UART setup: 8-N-1 @ 76800bps

  UCSRB=(1<<RXCIE) | (1<<RXEN);
  UBRRL=12;

  // T/C1 setup - enabling timer 1 interrupt on compare match
  //and setting OC1 value
  TIMSK=OCIE1A;
  OCR1A=0x0190;

    sei();

  while (1);
    
}

Код: Выделить всё

const uint8_t squarewave[] __attribute__ ((section (".MySection2")))= //square wave
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

Код: Выделить всё

void static inline Signal_OUT(const uint8_t *signal, uint8_t ad2, uint8_t ad1, uint8_t ad0)
{
asm volatile(	"eor r18, r18 	;r18<-0"	"\n\t"
				"eor r19, r19 	;r19<-0"	"\n\t"
				"1:"						"\n\t"
				"add r18, %0	;1 cycle"			"\n\t"
				"adc r19, %1	;1 cycle"			"\n\t"	
				"adc %A3, %2	;1 cycle"			"\n\t"
				"lpm 			;3 cycles" 	"\n\t"
				"out %4, __tmp_reg__	;1 cycle"	"\n\t"
				"sbis %5, 2		;1 cycle if no skip" "\n\t"
				"rjmp 1b		;2 cycles. Total 10 cycles"	"\n\t"
				:
				:"r" (ad0),"r" (ad1),"r" (ad2),"e" (signal),"I" (_SFR_IO_ADDR(PORTA)), "I" (_SFR_IO_ADDR(SPCR))
				:"r18", "r19" 
	);
}

Код: Выделить всё

            "add r18, %0   ;1 cycle"         "\n\t"
            "adc r19, %1   ;1 cycle"         "\n\t"   
            "adc %A3, %2   ;1 cycle"         "\n\t"

Код: Выделить всё

"lpm          ;3 cycles"    "\n\t"

Код: Выделить всё

            "sbis %5, 2      ;1 cycle if no skip" "\n\t"
            "rjmp 1b      ;2 cycles. Total 10 cycles"   "\n\t"