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use timer1 ctc mode instead of util/delay functions

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Vineet K 2024-04-17 10:07:39 -04:00 committed by Shokara Kou
parent 9d751dc020
commit 8f258e4e02
2 changed files with 41 additions and 31 deletions
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2
Makefile
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@ -2,6 +2,8 @@ CC = avr-gcc
CFLAGS = -O2 -Wall -Wextra -Werror -mmcu=atmega328p CFLAGS = -O2 -Wall -Wextra -Werror -mmcu=atmega328p
OBJCOPY = avr-objcopy OBJCOPY = avr-objcopy
PORT ?= /dev/ttyACM0
all: all:
${CC} ${CFLAGS} main.c ${CC} ${CFLAGS} main.c
${OBJCOPY} -j .text -j .data -O ihex a.out main.hex ${OBJCOPY} -j .text -j .data -O ihex a.out main.hex

70
main.c
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@ -1,43 +1,42 @@
/* /*
* EEL4746C - AVR Piano - Speaker Section * EEL4746C - AVR Piano - Speaker Section
* speaker is connected to PD2 and ground * speaker is connected to PD2 and ground
* buttons are connected to PB0-5, PC0-5, PD3-7 , PD3-7
* the LCD Arduino UNO is connected to TX/RX (PD0/1) * the LCD Arduino UNO is connected to TX/RX (PD0/1)
*/ */
#include <avr/io.h> #include <avr/io.h>
#include <avr/interrupt.h> #include <avr/interrupt.h>
#define F_CPU 16000000UL #define T1_PRESCALAR 8
#define __DELAY_BACKWARD_COMPATIBLE__ /* to use variables with _delay_u/ms */ #define FREQ(f) (16e6 / f / T1_PRESCALAR / 2)
#include <util/delay.h>
#define P_RX 0 #define P_RX 0
#define P_TX 1 #define P_TX 1
#define P_SPKR 2 #define P_SPKR 2
unsigned short freqs[] = { unsigned short freqs[] = {
1 / 100 * 1e6 / 2, FREQ(100),
1 / 200 * 1e6 / 2, FREQ(200),
1 / 250 * 1e6 / 2, FREQ(250),
1 / 300 * 1e6 / 2, FREQ(300),
1 / 350 * 1e6 / 2, FREQ(350),
1 / 400 * 1e6 / 2, FREQ(400),
1 / 500 * 1e6 / 2, FREQ(500),
1 / 600 * 1e6 / 2, FREQ(600),
1 / 700 * 1e6 / 2, FREQ(700),
1 / 750 * 1e6 / 2, FREQ(750),
1 / 1000 * 1e6 / 2, FREQ(1000),
1 / 1250 * 1e6 / 2, FREQ(1250),
1 / 1500 * 1e6 / 2, FREQ(1500),
1 / 1750 * 1e6 / 2, FREQ(1750),
1 / 2000 * 1e6 / 2, FREQ(2000),
1 / 3000 * 1e6 / 2, FREQ(3000),
1 / 4000 * 1e6 / 2, FREQ(4000),
1 / 5000 * 1e6 / 2, FREQ(5000),
1 / 6000 * 1e6 / 2, FREQ(6000),
1 / 7000 * 1e6 / 2, FREQ(7000),
1 / 8000 * 1e6 / 2 FREQ(8000),
}; };
unsigned char note = 8; unsigned char note = 8;
unsigned char buttonpressed = 1; unsigned char buttonpressed = 1;
@ -54,15 +53,24 @@ main(void)
PCMSK2 = ~(1 | (1 << 1) | (1 << 2)); PCMSK2 = ~(1 | (1 << 1) | (1 << 2));
PCICR = (1 << PCIE0) | (1 << PCIE1) | (1 << PCIE2); PCICR = (1 << PCIE0) | (1 << PCIE1) | (1 << PCIE2);
TCCR1A = 0x00; // use timer1 CTC mode
TCCR1B = 1 << WGM12; // already prescaled by 8 in table
sei(); sei();
//for (;;); //for (;;);
for (unsigned char n = 0;; n = (n + 1) % 2) { for (unsigned char n = 0;; n = (n + 1) % 2) {
if (!buttonpressed && n == 0) continue; if (!buttonpressed && n == 0) continue;
_delay_us(freqs[note]);
// _delay_us(714.2857); TCNT1 = 1;
// _delay_us(70); OCR1A = freqs[note];
TCCR1B |= 1 << CS11;
while ((TIFR1 & (1 << OCF1A)) == 0);
PORTD ^= 1 << P_SPKR; PORTD ^= 1 << P_SPKR;
TIFR1 |= 1 << OCF1A;
TCCR1B &= ~(1 << CS11);
} }
} }