Module expanders tutorial?

jerrysv · August 4, 2019, 5:59pm

I just went ahead and pushed some of the work I’ve been doing:

JerrySievert/CharredDesert/blob/v1.0/src/model/MessageBus.hpp

#pragma once

#include <string>
#include <vector>
#include <mutex>
#include <unordered_map>
#include <cstdint>

template <typename T>
class Message {
public:
  std::string id;
  T value;
};

template <typename T>
class MessageBus {
public:
  MessageBus<T>() { }

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I hadn’t pushed it previously as I’m not ready for release of this module yet, but this should give you a good idea of what I’m doing.

a module registers itself:

github.com

JerrySievert/CharredDesert/blob/v1.0/src/controller/Tine.cpp#L12




#define VALUE(a) (a.isConnected() ? a.getVoltage() : 0.0f)


TineModule::TineModule() {
  config(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS);
  configParam(POLARITY, 0, 1, 0);
  configParam(SPLIT, 0, 10, 5);
  configParam(LOWER_ATT, -10, 10, 0);
  configParam(UPPER_ATT, -10, 10, 0);


  id = messages->registerMember();
}


TineModule::~TineModule() {
  messages->deregisterMember(id);
}


float TineModule::paramValue (uint16_t param, uint16_t input, float low, float high) {
  float current = params[param].getValue();


  if (inputs[input].isConnected()) {

with a message being sent as so:

github.com

JerrySievert/CharredDesert/blob/v1.0/src/controller/Tine.cpp#L60-L66


Payload payload;
payload.values[0] = outputs[LOWER_OUT].getVoltage();
payload.values[1] = outputs[UPPER_OUT].getVoltage();
Message<Payload> *message = new Message<Payload>();
message->value = payload;


messages->send(id, message);

my plan is to expand it before actual release, to include message tags, but it works fairly well as-is.

it uses a mutex guard around the vector that stores the data, leaving only the most recent message from each publisher. any subscriber can get a copy of the most recent messages.