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labW5barnestr/Src/piezoSpeaker.c

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+/**
+ * @file piezoSpeaker.c
+ * @author Trevor Barnes
+ * @brief 
+ * @version 0.1
+ * @date 2022-01-19
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include "piezoSpeaker.h"
+#include "delay.h"
+
+
+void piezo_init(){
+
+	//enable GPIOB and Timer 3 RCC
+	*RCC_AHB1ENR |= (1<<GPIOBEN);
+	*RCC_APB1ENR |= (1<<TIM3_EN);
+
+	//set GPIO B to alternate function (0b10<<9)
+	//clears the two bits and then set it
+	*GPIOB_MODER = (*GPIOB_MODER&~(0b11<<8)) | (PB4_AF_V<<8);
+
+	//set alternate function low register to TIM3
+	*GPIOB_AFRL |= (1<<AFRL_TIM3_CH1_EN);
+
+	//Configure capture/compare mode register configuration
+	//to enable preload and set to pwm
+	*TIM3_CCMR1 |= OC1M_PWM2;
+	*TIM3_CCMR1 |= (1<<OC1PE);
+
+	//Configure CCER to enable timer 3 as output capture
+	*TIM3_CCER |= CCER_CC1E;
+
+	//Configure control register to enable preload
+	*TIM3_CR1 |= (1<<CR_ARPE_EN);
+
+}
+
+
+void play_note(double frequency, double duration){
+
+
+	*TIM3_PSC = 15;
+	//Divisor controls pitch
+	*TIM3_ARR = mil/frequency;
+
+	//Loudness (Smaller dividend = louder sound)
+	double freq = frequency/10;
+
+	//clear ccr1
+	*TIM3_CCR1 = (*TIM3_CCR1&~(0xFFFF));
+	*TIM3_CCR1 = freq;
+
+	//set EGR (accept only a byte of info so steps)
+	*TIM3_EGR |= EGR_UG;
+
+	//~~~Plays the notes
+	//Enables enable bit control register
+	*TIM3_CR1 |= 1;
+	//delay that leaves the speaker on for desired amount of time
+	delay_1ms(duration);
+	//Disables enable bit
+	*TIM3_CR1 &= ~1;
+}
+
+
+void play_song(Note *song, int size){
+	for(int i = 0; i < size; i++){
+		play_note(song[i].freq, song[i].duration);
+	}
+}