GT_Tuner2 - Slight modifications to original for different LC…

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Mike Pollock / Mbed 2 deprecated GT_Tuner2

Slight modifications to original for different LCD and mbed pin outs

Dependencies: mbed

Fork of GT_Tuner by Andrew Durand

main.cpp@0:490e67fb09c2, 2011-10-24 (annotated)

Committer:: adurand
Date:: Mon Oct 24 23:03:27 2011 +0000
Revision:: 0:490e67fb09c2
Child:: 1:ae7d0cf78b3e

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User	Revision	Line number	New contents of line
adurand	0:490e67fb09c2	1	//////////////////////////////////////////
adurand	0:490e67fb09c2	2	// //
adurand	0:490e67fb09c2	3	// Guitar Tuner via Goertzel's Algorithm //
adurand	0:490e67fb09c2	4	// Created by: Andrew Durand //
adurand	0:490e67fb09c2	5	// //
adurand	0:490e67fb09c2	6	//////////////////////////////////////////
adurand	0:490e67fb09c2	7
adurand	0:490e67fb09c2	8	#include "mbed.h"
adurand	0:490e67fb09c2	9	#include "adc.h"
adurand	0:490e67fb09c2	10	#include "NokiaLCD.h"
adurand	0:490e67fb09c2	11
adurand	0:490e67fb09c2	12	#define PI 3.1415
adurand	0:490e67fb09c2	13	#define SAMPLE_RATE 24000
adurand	0:490e67fb09c2	14
adurand	0:490e67fb09c2	15	DigitalOut led_low(LED1);
adurand	0:490e67fb09c2	16	DigitalOut led_ok(LED2);
adurand	0:490e67fb09c2	17	DigitalOut led_high(LED4);
adurand	0:490e67fb09c2	18	InterruptIn button1(p12);
adurand	0:490e67fb09c2	19
adurand	0:490e67fb09c2	20	//LCD and Other Random Variables
adurand	0:490e67fb09c2	21	NokiaLCD lcd(p5, p7, p8, p9, NokiaLCD::LCD6610); // mosi, sclk, cs, rst, type
adurand	0:490e67fb09c2	22	int string_select = 0;
adurand	0:490e67fb09c2	23	float high, high1, high2, high3, high4, high5, high6, high7, high8, in_tune, in_tune1, in_tune2, in_tune3,
adurand	0:490e67fb09c2	24	low, low1, low2, low3, low4, low5, low6, low7, low8, note;
adurand	0:490e67fb09c2	25	char* key;
adurand	0:490e67fb09c2	26	int Counter = 0;
adurand	0:490e67fb09c2	27	int Buffer[6000];
adurand	0:490e67fb09c2	28
adurand	0:490e67fb09c2	29	float goertzelFilter(int samples[], float freq, int N) {
adurand	0:490e67fb09c2	30	float s_prev = 0.0;
adurand	0:490e67fb09c2	31	float s_prev2 = 0.0;
adurand	0:490e67fb09c2	32	float coeff,normalizedfreq,power,s,k;
adurand	0:490e67fb09c2	33	int i;
adurand	0:490e67fb09c2	34	normalizedfreq = freq / SAMPLE_RATE;
adurand	0:490e67fb09c2	35	coeff = 2cos(2PI*normalizedfreq);
adurand	0:490e67fb09c2	36	for (i=0; i<N; i++) {
adurand	0:490e67fb09c2	37	s = samples[i] + coeff * s_prev - s_prev2;
adurand	0:490e67fb09c2	38	s_prev2 = s_prev;
adurand	0:490e67fb09c2	39	s_prev = s;
adurand	0:490e67fb09c2	40	}
adurand	0:490e67fb09c2	41	power = s_prev2s_prev2+s_prevs_prev-coeffs_prevs_prev2;
adurand	0:490e67fb09c2	42	return power;
adurand	0:490e67fb09c2	43	}
adurand	0:490e67fb09c2	44
adurand	0:490e67fb09c2	45	ADC adc(SAMPLE_RATE, 1);
adurand	0:490e67fb09c2	46
adurand	0:490e67fb09c2	47	void sample_audio(int chan, uint32_t value) {
adurand	0:490e67fb09c2	48	Buffer[Counter] = adc.read(p20);
adurand	0:490e67fb09c2	49	Counter += 1;
adurand	0:490e67fb09c2	50	}
adurand	0:490e67fb09c2	51
adurand	0:490e67fb09c2	52	void button1_pressed() {
adurand	0:490e67fb09c2	53	string_select++;
adurand	0:490e67fb09c2	54	if (string_select > 5) string_select = 0;
adurand	0:490e67fb09c2	55	}
adurand	0:490e67fb09c2	56
adurand	0:490e67fb09c2	57	int main() {
adurand	0:490e67fb09c2	58	//Interupt for Switching Strings
adurand	0:490e67fb09c2	59	button1.mode(PullDown);
adurand	0:490e67fb09c2	60	button1.rise(&button1_pressed);
adurand	0:490e67fb09c2	61
adurand	0:490e67fb09c2	62	//Setup LCD
adurand	0:490e67fb09c2	63	lcd.background(0xF0000F);
adurand	0:490e67fb09c2	64	lcd.cls();
adurand	0:490e67fb09c2	65
adurand	0:490e67fb09c2	66	while (1) {
adurand	0:490e67fb09c2	67
adurand	0:490e67fb09c2	68	switch (string_select) {
adurand	0:490e67fb09c2	69	case 0:
adurand	0:490e67fb09c2	70	note = 82;
adurand	0:490e67fb09c2	71	key= "E2";
adurand	0:490e67fb09c2	72	break;
adurand	0:490e67fb09c2	73	case 1:
adurand	0:490e67fb09c2	74	note = 110;
adurand	0:490e67fb09c2	75	key= "A2";
adurand	0:490e67fb09c2	76	break;
adurand	0:490e67fb09c2	77	case 2:
adurand	0:490e67fb09c2	78	note = 147;
adurand	0:490e67fb09c2	79	key= "D3";
adurand	0:490e67fb09c2	80	break;
adurand	0:490e67fb09c2	81	case 3:
adurand	0:490e67fb09c2	82	note = 196;
adurand	0:490e67fb09c2	83	key= "G3";
adurand	0:490e67fb09c2	84	break;
adurand	0:490e67fb09c2	85	case 4:
adurand	0:490e67fb09c2	86	note = 247;
adurand	0:490e67fb09c2	87	key= "B3";
adurand	0:490e67fb09c2	88	break;
adurand	0:490e67fb09c2	89	case 5:
adurand	0:490e67fb09c2	90	note = 330;
adurand	0:490e67fb09c2	91	key= "E4";
adurand	0:490e67fb09c2	92	break;
adurand	0:490e67fb09c2	93	}
adurand	0:490e67fb09c2	94
adurand	0:490e67fb09c2	95	//Prepare for burst mode on all ADC pins and set up interrupt handler (using ADC library from Simon Blandford
adurand	0:490e67fb09c2	96	adc.append(sample_audio);
adurand	0:490e67fb09c2	97	adc.startmode(0,0);
adurand	0:490e67fb09c2	98	adc.burst(1);
adurand	0:490e67fb09c2	99	adc.setup(p20,1);
adurand	0:490e67fb09c2	100
adurand	0:490e67fb09c2	101	//start the interrupt and wait for about 4096 samples
adurand	0:490e67fb09c2	102	adc.interrupt_state(p20,1);
adurand	0:490e67fb09c2	103	wait(.2);
adurand	0:490e67fb09c2	104
adurand	0:490e67fb09c2	105	//Finsh up - Unset pin 20
adurand	0:490e67fb09c2	106	adc.interrupt_state(p20,0);
adurand	0:490e67fb09c2	107	adc.setup(p20,0);
adurand	0:490e67fb09c2	108	int actual_rate = adc.actual_sample_rate();
adurand	0:490e67fb09c2	109
adurand	0:490e67fb09c2	110	//for debugging tell the terminal sample rate and how many samples we took
adurand	0:490e67fb09c2	111	printf("Requested max sample rate is %u, actual max sample rate is %u.\n",
adurand	0:490e67fb09c2	112	SAMPLE_RATE, actual_rate);
adurand	0:490e67fb09c2	113	printf("We did %i samples\n",Counter);
adurand	0:490e67fb09c2	114
adurand	0:490e67fb09c2	115	high1 = goertzelFilter(Buffer, (note+18), Counter);
adurand	0:490e67fb09c2	116	high2 = goertzelFilter(Buffer, (note+16), Counter);
adurand	0:490e67fb09c2	117	high3 = goertzelFilter(Buffer, (note+14), Counter);
adurand	0:490e67fb09c2	118	high4 = goertzelFilter(Buffer, (note+12), Counter);
adurand	0:490e67fb09c2	119	high5 = goertzelFilter(Buffer, (note+10), Counter);
adurand	0:490e67fb09c2	120	high6 = goertzelFilter(Buffer, (note+8), Counter);
adurand	0:490e67fb09c2	121	high7 = goertzelFilter(Buffer, (note+6), Counter);
adurand	0:490e67fb09c2	122	high8 = goertzelFilter(Buffer, (note+4), Counter);
adurand	0:490e67fb09c2	123	in_tune1 = goertzelFilter(Buffer, (note+0.5), Counter);
adurand	0:490e67fb09c2	124	in_tune2 = goertzelFilter(Buffer, note, Counter);
adurand	0:490e67fb09c2	125	in_tune3 = goertzelFilter(Buffer, (note-0.5), Counter);
adurand	0:490e67fb09c2	126	low1 = goertzelFilter(Buffer, (note-4), Counter);
adurand	0:490e67fb09c2	127	low2 = goertzelFilter(Buffer, (note-6), Counter);
adurand	0:490e67fb09c2	128	low3 = goertzelFilter(Buffer, (note-8), Counter);
adurand	0:490e67fb09c2	129	low4 = goertzelFilter(Buffer, (note-10), Counter);
adurand	0:490e67fb09c2	130	low5 = goertzelFilter(Buffer, (note-12), Counter);
adurand	0:490e67fb09c2	131	low6 = goertzelFilter(Buffer, (note-14), Counter);
adurand	0:490e67fb09c2	132	low7 = goertzelFilter(Buffer, (note-16), Counter);
adurand	0:490e67fb09c2	133	low8 = goertzelFilter(Buffer, (note-18), Counter);
adurand	0:490e67fb09c2	134
adurand	0:490e67fb09c2	135	in_tune = (in_tune1 + in_tune2 + in_tune3)/3;
adurand	0:490e67fb09c2	136	high = (high1 + high2 + high3 + high4 + high5 + high6 + high7 + high8)/8;
adurand	0:490e67fb09c2	137	low = (low1 + low2 + low3 + low4 + low5 + low6 + low7 + low8)/8;
adurand	0:490e67fb09c2	138
adurand	0:490e67fb09c2	139	if ((in_tune > high) && (in_tune > low)) {
adurand	0:490e67fb09c2	140	led_high = 0;
adurand	0:490e67fb09c2	141	led_ok = 1;
adurand	0:490e67fb09c2	142	led_low = 0;
adurand	0:490e67fb09c2	143	} else if (high > in_tune) {
adurand	0:490e67fb09c2	144	led_high = 1;
adurand	0:490e67fb09c2	145	led_ok = 0;
adurand	0:490e67fb09c2	146	led_low = 0;
adurand	0:490e67fb09c2	147	} else if (low > in_tune) {
adurand	0:490e67fb09c2	148	led_high = 0;
adurand	0:490e67fb09c2	149	led_ok = 0;
adurand	0:490e67fb09c2	150	led_low = 1;
adurand	0:490e67fb09c2	151	} else {
adurand	0:490e67fb09c2	152	led_high = 0;
adurand	0:490e67fb09c2	153	led_ok = 0;
adurand	0:490e67fb09c2	154	led_low = 0;
adurand	0:490e67fb09c2	155
adurand	0:490e67fb09c2	156	}
adurand	0:490e67fb09c2	157
adurand	0:490e67fb09c2	158	// Display on the LCD
adurand	0:490e67fb09c2	159	lcd.locate(0,1);
adurand	0:490e67fb09c2	160	lcd.printf("::Guitar Tuner::");
adurand	0:490e67fb09c2	161	lcd.locate(0,3);
adurand	0:490e67fb09c2	162	lcd.printf("Tuning String: %i", (6-string_select));
adurand	0:490e67fb09c2	163	lcd.locate(0,5);
adurand	0:490e67fb09c2	164	lcd.printf("%s at %i Hz",key, (int) note);
adurand	0:490e67fb09c2	165	lcd.locate(5,7);
adurand	0:490e67fb09c2	166	if (led_ok) lcd.printf("In Tune!");
adurand	0:490e67fb09c2	167	else if (led_low) lcd.printf("Too Low ");
adurand	0:490e67fb09c2	168	else if (led_high) lcd.printf("Too High");
adurand	0:490e67fb09c2	169	else lcd.printf("~~~~~");
adurand	0:490e67fb09c2	170
adurand	0:490e67fb09c2	171	Counter = 0;
adurand	0:490e67fb09c2	172
adurand	0:490e67fb09c2	173	}
adurand	0:490e67fb09c2	174
adurand	0:490e67fb09c2	175
adurand	0:490e67fb09c2	176
adurand	0:490e67fb09c2	177	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	16 Dec 2016
Imports:	0
Forks:	0
Commits:	3
Dependents:	0
Dependencies:	1
Followers:	1

main.cpp@0:490e67fb09c2, 2011-10-24 (annotated)

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