128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
#include "msp430.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#define c 3822
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#define dflat 3608
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#define d 3405
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#define eflat 3214
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#define e 3034
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#define f 2863
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#define gflat 2703
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#define g 2551
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#define aflat 2408
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#define a 2273
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#define bflat 2145
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#define b 2025
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#define cc 1911
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#define n 0
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#define LED1 BIT0
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#define BUTTON BIT3
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#define OUTPUT BIT6
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// CSINT should be 256^2 / 10 000 = 65 536 / 10 000 = 6
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// USINT should be 60 000
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#define CSUS 10000 // CSUS microseconds (us) in a centisecond (cs)
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#define CSINT 6 // centiseconds storable in int of microseconds
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#define USINT 60000 // CSINT in microseconds
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#define MAXNOTES 64 // record at most 64 notes (arbitrary)
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volatile bool recording = true;
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volatile unsigned int us = 0;
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volatile unsigned int cs = 0;
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unsigned int scale[13] = {
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c, dflat, d, eflat, e, f, gflat, g, aflat, a, bflat, b, cc
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};
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unsigned int whole[8] = {
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c, d, e, f, g, a, b, cc
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};
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void play(unsigned int note) {
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CCR0 = note;
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CCR1 = note == n ? 0 : 100;
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}
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void sing(unsigned int* song, unsigned int* lengths, unsigned int length) {
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for (int i = 0; i < length; i++) {
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play(song[i]);
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for (int j = 0; j < lengths[i]; j++) {
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__delay_cycles(CSUS);
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}
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}
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}
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unsigned int record(unsigned int* song, unsigned int* lengths) {
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unsigned int pos = 1;
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unsigned int note;
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TAR = 0;
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P1OUT |= LED1;
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while (recording) {
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note = whole[P2IN & 0xF];
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if (note != song[pos - 1]) {
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lengths[pos - 1] = cs + (us + TAR)/CSUS;
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song[pos] = note;
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play(note);
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cs = us = TAR = 0;
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pos++;
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}
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__delay_cycles(0x200);
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}
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P1OUT &= ~LED1;
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return pos;
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}
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void main(void) {
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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P2DIR = 0; // P2 all input
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P1DIR = OUTPUT | LED1; // P1.6, P1.0 output (P1.3 input)
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P1SEL |= OUTPUT; // P1.6 to TA0.1
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P1REN = BUTTON; // button resistor pullup/pulldown
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P1IE = BUTTON; // enable button interrupt
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CCTL1 = OUTMOD_7; // CCR1 reset/set
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TACTL = TASSEL_2 | MC_1; // SMCLK (1 MHz) count up to CCRO
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TACCTL0 = CCIE; // enable clock interrupt
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__enable_interrupt();
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unsigned int rec[MAXNOTES];
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unsigned int len[MAXNOTES];
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unsigned int length = record(rec, len);
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sing(rec, len, length);
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}
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=TIMER0_A0_VECTOR
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__interrupt void timer0_a0_isr(void)
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#else
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void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) timer0_a0_isr (void)
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#endif
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{
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unsigned int us_left = USINT - us; // count up to USINT microseconds in us
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if (us_left < TACCR0) {
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cs += CSINT; // add centiseconds to count
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us = TACCR0 - us_left; // save overflow
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} else {
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us += TACCR0;
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}
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TACCTL0 &= ~CCIFG; // set interrupt flag to 0
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}
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#if defined(__TI_COMPILER_VERSION__)
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#pragma vector=PORT1_VECTOR
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__interrupt void port1_isr(void)
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#else
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void __attribute__ ((interrupt(PORT1_VECTOR))) port1_isr (void)
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#endif
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{
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recording = false; // stop recording
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P1OUT ^= BIT0;
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P1IFG &= ~BIT3; // set interrupt flag to 0
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P1IE &= ~BIT3; // disable interrupts for button
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}
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