DIY Peavey Sanpera footswitch

[swisher]

Hi guys!
I made footswitch for my Vypyr combo and programmed it in C (AVR). But I stuck on MIDI part. Does anyone know what code exactly is sending to combo from Sanpera I? I need commands for presets 1-4 only. Is it "program change" or "control change"? Does it sent 3 or 4 bytes at the same time?

[Sweetalk]

Did a quick google search and this came out, check it and see if that's what you need
http://zorkmids.com/?p=1425

[swisher]

I found it too (any few other sites). But I don't know how the string should look. There are few examples like this:

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//MIDI COMMANDS
void patch(int instrument) {   
  Serial1.write((byte)0xC0);
  Serial1.write((byte)instrument);
}

void controller(int controller, int value) {
  Serial1.write((byte)0xB0);
  Serial1.write((byte)controller);
  Serial1.write((byte)value);
}
void noteOn(int key, int vel) {
  Serial1.write((byte)0x90);
  Serial1.write((byte)key);
  Serial1.write((byte)vel);
}

void noteOff(int key) {
  Serial1.write((byte)0x90);
  Serial1.write((byte)key);
  Serial1.write((byte)0x00);
}

I don't know what combination and what values should be used for 1 button which turn on 1 preset on VIP1.

[potul]

If you look at the code from the page Sweetalk posted, you will see it's using Program Change messages. Each button has a different program from 1 to 4.

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      if (button1State == HIGH) {
        led1State = HIGH;
        patch(1);
      }
.....

void patch(int instrument) {   
  Serial1.write((byte)0xC0);
  Serial1.write((byte)instrument);
}


[swisher]

I don't know Arduino, I'm learning classic C. That's how I did reaction for pressed button:

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if ( !switch_lock && !( PINC & SW1 ) ) {
    switch_lock = 50000;
    MIDI_send( 192, 4 );
}

But it's not working correct. It changes preset and then blocks anything for about 10 seconds, even on the amp. And after another few seconds it changes presets totally random.

[garcho]

Post all of your code.

[swisher]

Code Select Expand

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <stdlib.h>
#include <stdint.h>
#include <util/delay.h>

#include "midi.h"

#define SW1 (1<<PC3)
#define SW2 (1<<PC2)
#define SW3 (1<<PC1)
#define SW4 (1<<PC0)
#define SWITCHES ( SW1 | SW2 | SW3 | SW4 )

#define LED1 (1<<PD5)
#define LED2 (1<<PD6)
#define LED3 (1<<PD7)
#define LED4 (1<<PB0)


void MIDI_send( uint8_t midi_program );
void InitTimer ( void );

uint16_t switch_lock;
uint8_t switch_status=0;
uint8_t mode=1;

int main( void ) {

    DDRC  &= ~SWITCHES;
    PORTC |= SWITCHES;

    DDRD  |= ( LED1 | LED2 | LED3 );
    PORTD &= ( LED1 | LED2 | LED3 );

    DDRB  |= ( LED4 );
    PORTB &= ~( LED4 );

    sei();

    UART_Init( __UBRR );         

    while ( 1 ) {

        /* CLEAN CHANNEL */
        if ( !switch_lock && !( PINC & SW1 ) ) {
        switch_lock = 50000;
        switch_status=1;
        MIDI_send( 4-switch_status );
        }
        else if ( switch_lock && ( PINC & SW1 ) ) switch_lock++;

        /* LO CRUNCH */
if ( !switch_lock && !( PINC & SW3 ) ) {
switch_lock = 50000;
switch_status=2;
MIDI_send( 4-switch_status );
}
else if ( switch_lock && ( PINC & SW3 ) ) switch_lock++;

/* HI CRUNCH */
if ( !switch_lock && !( PINC & SW4 ) ) {
switch_lock = 50000;
switch_status=3;
MIDI_send( 4-switch_status );
}
else if ( switch_lock && ( PINC & SW4 ) ) switch_lock++;


        /* HEAVY CHANNEL */
        if ( !switch_lock && !( PINC & SW2 ) ) {
            switch_lock = 50000;
            switch_status=4;
            MIDI_send( 4-switch_status );
        }
        else if ( switch_lock && ( PINC & SW2 ) ) switch_lock++;


        // LEDS
        if ( switch_status==0 ) {
        PORTD &= ( LED1 | LED2 | LED3 );
        PORTB &= ~( LED4 );
        }
        else if ( switch_status==1 ) {
        PORTD |= ( LED1 );
        PORTD &= ~( LED2 | LED3 );
        PORTB &= ~( LED4 );
        }
        else if ( switch_status==2 ) {
        PORTD |= ( LED3 );
PORTD &= ~( LED1 | LED2 );
PORTB &= ~( LED4 );
        }
        else if ( switch_status==3 ) {
        PORTD &= ~( LED1 | LED2 | LED3 );
        PORTB |= ( LED4 );
        }
        else if ( switch_status==4 ) {
        PORTD |= ( LED2 );
PORTD &= ~( LED1 | LED3 );
PORTB &= ~( LED4 );
        }
    }
}

void MIDI_send( uint8_t midi_program ) {
    uart_putc( 0xC0 ); // 0xBn
    uart_putc( midi_program );     // 0-127
}