led time counter help

piku · March 3, 2011, 2:37am

i’m building a little light installation with leds controlled via midi

i programmed the firmware following the C examples given by thorsten

the problem is that sometimes some leds remain on due to bad midi transmission, since i’m using a wireless midi device (cme widi)

i’d like to make the firmware able to set alwais the leds off after some seconds

let’s say .. a led doesn’t receive his midi note off message, so it remain lighten, what i want some counter algorithm that turn a led off after 2 seconds.

can someone give me saome examples i can follow?

i have no programming skills!!

piku · March 4, 2011, 3:49pm

mmmh .. ok

i used some suggestions i found here:

http://discourse.midibox.org/t/topic/13239

for now the leds of all my 8 shift registers are turned all off after 250 ms since the last note on received…

i used a global variable called “timerled”

ad every note on received it is turned to 0

and everytime it reaches 250 all led are set to 0

this is how the thing works

void SR_Service_Prepare(void) __wparam

{

if( ++timerled >= 250 ) {

    timerled = 0;


 MIOS_DOUT_SRSet(0,0x00);

 MIOS_DOUT_SRSet(1,0x00);

 MIOS_DOUT_SRSet(2,0x00);

 MIOS_DOUT_SRSet(3,0x00);

 MIOS_DOUT_SRSet(4,0x00);

 MIOS_DOUT_SRSet(5,0x00);

 MIOS_DOUT_SRSet(6,0x00);

 MIOS_DOUT_SRSet(7,0x00);


  }


}

now.. i repeat i have no programming skills

what i need now is a way to make the same work but for every single led

i thougt i have to use a multiple variabe like " unsigned char timerled[64] "

but do i have to repeat the “if” code 64 times???

is there an intelligent way to do this?

i mean .. how do i have to configure the code for a multiple variable in the SR_Service_Prepare section??

piku · March 4, 2011, 7:41pm

ahahah well..

it’s funny that it seems some kink of monologue but…

i finally found the final solution

i set two variables:

unsigned char timerled[64];

unsigned char actualed;

each time a note on i received , the corresponding led is set to ON and his timer is set to 0…

then.. in the SR_Service_Prepare section:

if ( ++actualed >= 64 ) {

    actualed = 0;


  }




if ( ++timerled[actualed] >= 16 ) { 

MIOS_DOUT_PinSet(actualed, 0);

 timerled[actualed] = 0;

}

so each led has a fixed duration…

thanks to the forum anyway!! ahaha

T.K · March 6, 2011, 9:22pm

Congrats - you mastered the first step of the MIDIbox code wizard diploma!

Best Regards, Thorsten.