ccvalue led and shift register

[benwadub]

hi Pieter, I try to begin adding less to my controller, I like to add a led to my mute button that send cc 104 on channel 1
I use a sn74hc595n on breadboard
my led is lighting and seems to not respond to the cc104 I setup Ableton to input and output midi events I m not sure if my breadboard work nicely so I ask you if you think my code is good or if I m missing something?
I extracted only the element concerning led and button from my sketch.

#include <Control_Surface.h>
#include <Encoder.h> // Include the Encoder library.
USBMIDI_Interface usbmidi;

//-------------------------------LEDS setup-----------------------
using namespace ExtIO;
const pin_t latchPin = 10;  // Pin connected to ST_CP of 74HC595
const pin_t dataPin  = 11;  // Pin connected to DS of 74HC595
const pin_t clockPin = 13;  // Pin connected to SH_CP of 74HC595

/* Instantiate a shift register on the correct pins, most significant bit
 * first, and a total of 8 outputs. */
ShiftRegisterOut<8> sreg = { dataPin, clockPin, latchPin, MSBFIRST };

const pin_t ledPin = sreg.pin(0); // first pin of the shift register
CCValueLED led = {
  sreg.pin(7),             // Pin of shiftreg
  {104, CHANNEL_1}, // cc104 on MIDI channel 1
};
CD74HC4067 mux6 = {
  6,      
  {9, 3, 4, 5} 
};
CCButton buttontransportmomentary[] = {
  {mux6.pin(1), {104, CHANNEL_1}},
  {mux6.pin(2), {105, CHANNEL_1}},
  {mux6.pin(3), {106, CHANNEL_1}},
  {mux6.pin(4), {107, CHANNEL_1}},
  {mux6.pin(5), {108, CHANNEL_1}},
  {mux6.pin(6), {109, CHANNEL_1}},
  {mux6.pin(7), {110, CHANNEL_1}},
  {mux6.pin(15), {103, CHANNEL_2}},//numéro de bank correspondant/indique que le changement de bank change le canal midi (+8 car on a 8 adresses par bank)/pin sur laquelle le controleur est branché/numéro de cc/numéro de canal midi
  {mux6.pin(14), {104, CHANNEL_2}},
  {mux6.pin(13), {105, CHANNEL_2}},
  {mux6.pin(12), {106, CHANNEL_2}},
  {mux6.pin(11), {107, CHANNEL_2}},
  {mux6.pin(10), {108, CHANNEL_2}},
  {mux6.pin(9), {109, CHANNEL_2}},
  {mux6.pin(8), {110, CHANNEL_2}},
  };
void setup() {
  sreg.begin();
  pinMode(ledPin, OUTPUT); // You don't even need this line, since
                           // shift registers are always outputs
Control_Surface.begin();
}

void loop() {
   Control_Surface.loop(); // Update the Control Surface
usbmidi.update();

}```

[tttapa]

Start with the Bitbang-Blink example to make sure the wiring of the shift register and LED is correct. If that works, use a CCValueLED object with the USBDebugMIDI_Interface. Writing B0 68 7F in the serial monitor (115200 baud) should turn on the LED, B0 68 00 should turn it off.

[benwadub]

I d like my leds lighting when ableton mute is lighting and not lighting when ableton is not lighting, do you think it s possible?

[tttapa]

That's what CCValueLED should do. Is that not what's happening?

[benwadub]

It is the opposite, when ableton is light the controller is not.

[tttapa]

You can either invert it in software or flip the LED in hardware. If it's wired between the shift register output and ground, connect it between Vcc and the output pin instead. Watch the polarity of the LED, you'll have to swap it as well.

[benwadub]

Woah great tip for a noob like me! Thanks!