Fixed Length Triggers

[marioguzzi]

Hi,

I'm planning to develop an application that reacts to note-on midi messages to trigger dout pins for a fixed time, using the Timer or Tick function seems the way to go but being not really a coder I'm a bit confused on the approach to use.

Any idea?

I tried searching the forum but it seems the search engine is not working

[TK.]

Define an array which contains counter variables for each individual DOUT pin:

// in this example for up to 16 pins

#define NUM_DOUT_DELAY_CTR 16

unsigned char dout_delay_ctr[NUM_DOUT_DELAY_CTR];

[/code]




initialize these counters in Init():

[code]

void Init(void) __wparam

{

  unsigned char i;


  for(i=0; i<NUM_DOUT_DELAY_CTR; ++i)

    dout_delay_ctr[i] = 0;


  // ...remaining init stuff...

Add following code to SR_Service_Finish():

void SR_Service_Finish(void) __wparam

{

  unsigned char i;


  for(i=0; i<NUM_DOUT_DELAY_CTR; ++i)

    if( dout_delay_ctr[i] && --dout_delay_ctr[i] == 0 ) {

      MIOS_DOUT_PinSet(i, 0);

    }

}

[/code]



done!



Whenever you set a pin, set "dout_delay_ctr[pin]" to a value between 1..255

This value defines the delay in mS after which the DOUT pin will be cleared again.


Best Regards, Thorsten.

[marioguzzi]

thank you Thorsten,

both for the reply and for MIDIBOX :-)