Fixed Length Triggers

MIOS programming (C)
1

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

2

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.
3

thank you Thorsten,

both for the reply and for MIDIBOX :slight_smile: