AVR počítadlo T0 - História úprav

Balogh: Odstránený obsah stránky

2021-02-21T17:46:58Z

Odstránený obsah stránky

← Staršia verzia		Verzia z 17:46, 21. február 2021
Riadok 1:		Riadok 1:
	~~Tento program pouzije PortD.4 (arduino D4) ako pocitadlo.~~
	~~Mozne pripojit tlacitko, alebo 555 a pocitat pocet impulzov.~~

	~~Vstavany terminal Arduina nema formatovanie, takze treba pouzit~~
	~~iny terminal aby sa to pekne vypisovalo:~~

	~~<source lang="c">~~
	~~#define SWITCH 5 // select the pin for Switch~~

	~~void setup()~~
	{
	~~pinMode(SWITCH, INPUT); // this pin is an INPUT~~
	~~TCNT1 = 0x00; // initialize (CLEAR)counter~~
	~~TCCR1B = 0x07; // T1 clk = external clock source on pin T1, rising edge~~

	~~Serial.begin(9600);~~
	~~Serial.println("Button test:");~~
	}

	~~void loop() // endless loop~~
	{
	~~Serial.print("Input D5 = ");~~
	~~Serial.print(digitalRead(SWITCH),BIN);~~
	~~Serial.print(" TCNT1 = ");~~
	~~Serial.print(TCNT1,DEC);~~
	~~Serial.print('\r'); // this will not work with embedded Serial Monitor,~~
	~~// but works fine with e.g. putty terminal~~

	~~delay(250); // wait 1/4s for another measurement~~
	}

	~~</source>~~



	~~[[Obrázok:AVR Timer T1 Counter.png\|center]]~~



	~~[[Obrázok:AVR Timer TCNT1 Counter.png\|center]]~~


	~~Nasledovny kus programu nastavi pocitadlo na 5 impulzov pred pretecenim (0xFFFF - 5) a~~
	~~potom sleduje v hlavnej slucke, kedy nastane pretecenie. Ako hodinky je pouzity externy~~
	~~signal na T1, cize tlacitko alebo 555.~~

	~~<source lang="C">~~
	~~/* Example 9.2. Timer counter 1 in timer mode - pooled version */~~

	~~#define SWITCH 5 // Arduino D5, ATmega328 PD.5~~
	~~#define LED 13 // Arduino D13, ATmega328 PB.5~~

	~~int ledState = LOW; // variable used to store the last LED status, to toggle the light~~

	~~void setup() // run once, when the sketch starts~~
	{
	~~/* ********************* Init device ********************************** */~~

	~~pinMode(SWITCH, INPUT); // this pin is an INPUT~~
	~~pinMode(LED, OUTPUT);~~

	~~Serial.begin(9600);~~
	~~Serial.println("Timer T1 test:");~~

	~~TCCR1B = 0x07; // T1 clk = external clock source on pin T1, rising edge~~
	~~TCCR1A = 0x00; // T1 in timer mode~~
	~~TCNT1 = 0xFFFB; // initialize the counter (16-bit! Low+High bytes)~~
	~~TIFR1 = 0x01; // (1<<TOV1); if a 1 is written to a TOV1 bit~~
	~~// - the TOV1 bit will be cleared~~
	}

	~~/* ********************* Main Loop ************************************ */~~

	~~void loop() // run over and over again~~
	{
	~~if ( (TIFR1 & 0x01) == 0x01) // If the overflow flag is set~~
	{
	~~ledState = !ledState; // toggle the status of the ledPin~~
	~~digitalWrite(LED, ledState); // update the LED pin itself~~
	~~TCNT1 = 0xFFFB; // Restart T1 - reload~~
	~~TIFR1 = 0x01; // Clear the overflow flag~~
	}
	~~else~~
	~~asm("nop"); // Do nothing~~

	~~Serial.print("Input D5 = ");~~
	~~Serial.print(digitalRead(SWITCH),BIN);~~
	~~Serial.print(" TCNT1 = ");~~
	~~Serial.print(TCNT1,DEC);~~
	~~Serial.print('\r'); // this will not work with embedded Serial Monitor,~~
	~~// but works fine with e.g. putty terminal~~

	}

	~~</source>~~

Balogh: Vytvorená stránka „Tento program pouzije PortD.4 (arduino D4) ako pocitadlo. Mozne pripojit tlacitko, alebo 555 a pocitat pocet impulzov. Vstavany terminal Arduina nema formatovanie, takz…“

2021-02-21T17:20:49Z

Vytvorená stránka „Tento program pouzije PortD.4 (arduino D4) ako pocitadlo. Mozne pripojit tlacitko, alebo 555 a pocitat pocet impulzov. Vstavany terminal Arduina nema formatovanie, takz…“

Nová stránka

Tento program pouzije PortD.4 (arduino D4) ako pocitadlo.
Mozne pripojit tlacitko, alebo 555 a pocitat pocet impulzov.

Vstavany terminal Arduina nema formatovanie, takze treba pouzit
iny terminal aby sa to pekne vypisovalo:

<source lang="c">
#define SWITCH 5 // select the pin for Switch

void setup()
{
pinMode(SWITCH, INPUT); // this pin is an INPUT
TCNT1 = 0x00; // initialize (CLEAR)counter
TCCR1B = 0x07; // T1 clk = external clock source on pin T1, rising edge

Serial.begin(9600);
Serial.println("Button test:");
}

void loop() // endless loop
{
Serial.print("Input D5 = ");
Serial.print(digitalRead(SWITCH),BIN);
Serial.print(" TCNT1 = ");
Serial.print(TCNT1,DEC);
Serial.print('\r'); // this will not work with embedded Serial Monitor,
// but works fine with e.g. putty terminal

delay(250); // wait 1/4s for another measurement
}

</source>

[[Obrázok:AVR Timer T1 Counter.png|center]]

[[Obrázok:AVR Timer TCNT1 Counter.png|center]]

Nasledovny kus programu nastavi pocitadlo na 5 impulzov pred pretecenim (0xFFFF - 5) a
potom sleduje v hlavnej slucke, kedy nastane pretecenie. Ako hodinky je pouzity externy
signal na T1, cize tlacitko alebo 555.

<source lang="C">
/* Example 9.2. Timer counter 1 in timer mode - pooled version */

#define SWITCH 5 // Arduino D5, ATmega328 PD.5
#define LED 13 // Arduino D13, ATmega328 PB.5

int ledState = LOW; // variable used to store the last LED status, to toggle the light

void setup() // run once, when the sketch starts
{
/* *********************** Init device ************************************ */

pinMode(SWITCH, INPUT); // this pin is an INPUT
pinMode(LED, OUTPUT);

Serial.begin(9600);
Serial.println("Timer T1 test:");

TCCR1B = 0x07; // T1 clk = external clock source on pin T1, rising edge
TCCR1A = 0x00; // T1 in timer mode
TCNT1 = 0xFFFB; // initialize the counter (16-bit! Low+High bytes)
TIFR1 = 0x01; // (1<<TOV1); if a 1 is written to a TOV1 bit
// - the TOV1 bit will be cleared
}

/* *********************** Main Loop ************************************** */

void loop() // run over and over again
{
if ( (TIFR1 & 0x01) == 0x01) // If the overflow flag is set
{
ledState = !ledState; // toggle the status of the ledPin
digitalWrite(LED, ledState); // update the LED pin itself
TCNT1 = 0xFFFB; // Restart T1 - reload
TIFR1 = 0x01; // Clear the overflow flag
}
else
asm("nop"); // Do nothing

Serial.print("Input D5 = ");
Serial.print(digitalRead(SWITCH),BIN);
Serial.print(" TCNT1 = ");
Serial.print(TCNT1,DEC);
Serial.print('\r'); // this will not work with embedded Serial Monitor,
// but works fine with e.g. putty terminal

}

</source>