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Found 2 results

  1. Hey forum! I always wanted to make a synthesizer , so i chose the msp430 launchpad, because it's one of the most inappropriate chip i can use for it :grin: When i started to make it i didn't have real goal, i just wanted to make a sound, so this project is kind if all over the place but i have learned a lot doing it so it was totally worth it. The DAC used is a TI TLC5615, it's not the best choice, but i only had this in my parts bin. Probably any other SPI DAC could be used with minimal modification, or even PWM. (I don't sound good with PWM IMO.) The TLC5615 needs 5 volts, but it seem to run good with 3.6 volt from the launchpad,or you could use TP3 (the USB 5V) but that can be noisy, I used a separate 5V supply. The crystal is required, because it tunes the DCO on every start up to a pre-defined value ( i ran it at 19Mhz without any problems) If you change the frequency , you only need to change the bit rate divider for the USCI UART. There are a lot to optimize/rewrite but i kind of grew tired of playing with variables to get a few more bytes of free ram. Maybe i'll rewrite it on an F5510 as it would be a much better choice because it has 8 x Ram as much ram and a hardware multiplier. This is a synth with 16 voice of polyphony. It accepts midi massages from 1-8 and 10 (for the drum sounds). Each midi channel has it's own different settings for: -MIDI program -LFO width and speed (CC01 for combined mod wheel control, CC02 for width,CC03 for speed -Oscillator type (simple with any waveform or with ADSR square or sine wave) -Pitch bend -Portamento on/of (CC65) -Portamento speed (CC05) -Channel volume (CC07) It plays 8 sine/square with ADSR, 4 with any waveform (now only Saw and triangle), and 4 drum sounds simultaneously. Here are two songs i recorded with it: Soundcloud. I have attached the CCS Project with the source codes in a ZIP, the schematics, and a picture of how it look on my breadboard. mSpYNTH.zip mysy
  2. L293D

    Auduino code

    I am sure everybody has seen the Auduino code (Grain synth for arduino). I don't really understand the way that the PWM is setup, so I have no idea how to make this work on the MSP430 (or if it even can). Could someone explain how the timers are setup in this code? and the interrupt vector as well? I am just curious how one would setup the timer on one of the MSP430's? // Auduino, the Lo-Fi granular synthesiser // // by Peter Knight, Tinker.it http://tinker.it // // Help: http://code.google.com/p/tinkerit/wiki/Auduino // More help: http://groups.google.com/group/auduino // // Analog in 0: Grain 1 pitch // Analog in 1: Grain 2 decay // Analog in 2: Grain 1 decay // Analog in 3: Grain 2 pitch // Analog in 4: Grain repetition frequency // // Digital 3: Audio out (Digital 11 on ATmega8) // // Changelog: // 19 Nov 2008: Added support for ATmega8 boards // 21 Mar 2009: Added support for ATmega328 boards // 7 Apr 2009: Fixed interrupt vector for ATmega328 boards // 8 Apr 2009: Added support for ATmega1280 boards (Arduino Mega) #include <avr/io.h> #include <avr/interrupt.h> uint16_t syncPhaseAcc; uint16_t syncPhaseInc; uint16_t grainPhaseAcc; uint16_t grainPhaseInc; uint16_t grainAmp; uint8_t grainDecay; uint16_t grain2PhaseAcc; uint16_t grain2PhaseInc; uint16_t grain2Amp; uint8_t grain2Decay; // Map Analogue channels #define SYNC_CONTROL (4) #define GRAIN_FREQ_CONTROL (0) #define GRAIN_DECAY_CONTROL (2) #define GRAIN2_FREQ_CONTROL (3) #define GRAIN2_DECAY_CONTROL (1) // Changing these will also requires rewriting audioOn() #if defined(__AVR_ATmega8__) // // On old ATmega8 boards. // Output is on pin 11 // #define LED_PIN 13 #define LED_PORT PORTB #define LED_BIT 5 #define PWM_PIN 11 #define PWM_VALUE OCR2 #define PWM_INTERRUPT TIMER2_OVF_vect #elif defined(__AVR_ATmega1280__) // // On the Arduino Mega // Output is on pin 3 // #define LED_PIN 13 #define LED_PORT PORTB #define LED_BIT 7 #define PWM_PIN 3 #define PWM_VALUE OCR3C #define PWM_INTERRUPT TIMER3_OVF_vect #else // // For modern ATmega168 and ATmega328 boards // Output is on pin 3 // #define PWM_PIN 3 #define PWM_VALUE OCR2B #define LED_PIN 13 #define LED_PORT PORTB #define LED_BIT 5 #define PWM_INTERRUPT TIMER2_OVF_vect #endif // Smooth logarithmic mapping // uint16_t antilogTable[] = { 64830,64132,63441,62757,62081,61413,60751,60097,59449,58809,58176,57549,56929,56316,55709,55109, 54515,53928,53347,52773,52204,51642,51085,50535,49991,49452,48920,48393,47871,47356,46846,46341, 45842,45348,44859,44376,43898,43425,42958,42495,42037,41584,41136,40693,40255,39821,39392,38968, 38548,38133,37722,37316,36914,36516,36123,35734,35349,34968,34591,34219,33850,33486,33125,32768 }; uint16_t mapPhaseInc(uint16_t input) { return (antilogTable[input & 0x3f]) >> (input >> 6); } // Stepped chromatic mapping // uint16_t midiTable[] = { 17,18,19,20,22,23,24,26,27,29,31,32,34,36,38,41,43,46,48,51,54,58,61,65,69,73, 77,82,86,92,97,103,109,115,122,129,137,145,154,163,173,183,194,206,218,231, 244,259,274,291,308,326,346,366,388,411,435,461,489,518,549,581,616,652,691, 732,776,822,871,923,978,1036,1097,1163,1232,1305,1383,1465,1552,1644,1742, 1845,1955,2071,2195,2325,2463,2610,2765,2930,3104,3288,3484,3691,3910,4143, 4389,4650,4927,5220,5530,5859,6207,6577,6968,7382,7821,8286,8779,9301,9854, 10440,11060,11718,12415,13153,13935,14764,15642,16572,17557,18601,19708,20879, 22121,23436,24830,26306 }; uint16_t mapMidi(uint16_t input) { return (midiTable[(1023-input) >> 3]); } // Stepped Pentatonic mapping // uint16_t pentatonicTable[54] = { 0,19,22,26,29,32,38,43,51,58,65,77,86,103,115,129,154,173,206,231,259,308,346, 411,461,518,616,691,822,923,1036,1232,1383,1644,1845,2071,2463,2765,3288, 3691,4143,4927,5530,6577,7382,8286,9854,11060,13153,14764,16572,19708,22121,26306 }; uint16_t mapPentatonic(uint16_t input) { uint8_t value = (1023-input) / (1024/53); return (pentatonicTable[value]); } void audioOn() { #if defined(__AVR_ATmega8__) // ATmega8 has different registers TCCR2 = _BV(WGM20) | _BV(COM21) | _BV(CS20); TIMSK = _BV(TOIE2); #elif defined(__AVR_ATmega1280__) TCCR3A = _BV(COM3C1) | _BV(WGM30); TCCR3B = _BV(CS30); TIMSK3 = _BV(TOIE3); #else // Set up PWM to 31.25kHz, phase accurate TCCR2A = _BV(COM2B1) | _BV(WGM20); TCCR2B = _BV(CS20); TIMSK2 = _BV(TOIE2); #endif } void setup() { pinMode(PWM_PIN,OUTPUT); audioOn(); pinMode(LED_PIN,OUTPUT); } void loop() { // The loop is pretty simple - it just updates the parameters for the oscillators. // // Avoid using any functions that make extensive use of interrupts, or turn interrupts off. // They will cause clicks and poops in the audio. // Smooth frequency mapping //syncPhaseInc = mapPhaseInc(analogRead(SYNC_CONTROL)) / 4; // Stepped mapping to MIDI notes: C, Db, D, Eb, E, F... //syncPhaseInc = mapMidi(analogRead(SYNC_CONTROL)); // Stepped pentatonic mapping: D, E, G, A, B syncPhaseInc = mapPentatonic(analogRead(SYNC_CONTROL)); grainPhaseInc = mapPhaseInc(analogRead(GRAIN_FREQ_CONTROL)) / 2; grainDecay = analogRead(GRAIN_DECAY_CONTROL) / 8; grain2PhaseInc = mapPhaseInc(analogRead(GRAIN2_FREQ_CONTROL)) / 2; grain2Decay = analogRead(GRAIN2_DECAY_CONTROL) / 4; } SIGNAL(PWM_INTERRUPT) { uint8_t value; uint16_t output; syncPhaseAcc += syncPhaseInc; if (syncPhaseAcc < syncPhaseInc) { // Time to start the next grain grainPhaseAcc = 0; grainAmp = 0x7fff; grain2PhaseAcc = 0; grain2Amp = 0x7fff; LED_PORT ^= 1 << LED_BIT; // Faster than using digitalWrite } // Increment the phase of the grain oscillators grainPhaseAcc += grainPhaseInc; grain2PhaseAcc += grain2PhaseInc; // Convert phase into a triangle wave value = (grainPhaseAcc >> 7) & 0xff; if (grainPhaseAcc & 0x8000) value = ~value; // Multiply by current grain amplitude to get sample output = value * (grainAmp >> 8); // Repeat for second grain value = (grain2PhaseAcc >> 7) & 0xff; if (grain2PhaseAcc & 0x8000) value = ~value; output += value * (grain2Amp >> 8); // Make the grain amplitudes decay by a factor every sample (exponential decay) grainAmp -= (grainAmp >> 8) * grainDecay; grain2Amp -= (grain2Amp >> 8) * grain2Decay; // Scale output to the available range, clipping if necessary output >>= 9; if (output > 255) output = 255; // Output to PWM (this is faster than using analogWrite) PWM_VALUE = output; } So really I would just like someone to explain: // Set up PWM to 31.25kHz, phase accurate TCCR2A = _BV(COM2B1) | _BV(WGM20); TCCR2B = _BV(CS20); TIMSK2 = _BV(TOIE2); and these defines: #define PWM_PIN 3 #define PWM_VALUE OCR2B #define PWM_INTERRUPT TIMER2_OVF_vect and if there is a way to setup one of the timers on the 2452 or 2553 to accomplish the same thing. As always, thanks very much. L293D
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