"Hello World' for Mutable Instruments Rings module

rings.cc

// Copyright 2015 Olivier Gillet.
// 
// Author: Olivier Gillet (ol.gillet@gmail.com)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
// See http://creativecommons.org/licenses/MIT/ for more information.

#include "rings/drivers/adc.h"
#include "rings/drivers/codec.h"
#include "rings/drivers/leds.h"
#include "rings/drivers/system.h"
#include "rings/drivers/version.h"

#include "stmlib/dsp/dsp.h"
#include "stmlib/system/system_clock.h"

using namespace rings;
using namespace stmlib;

Adc adc;
Codec codec;
Leds leds;
 
int counter;

// Default interrupt handlers.
extern "C" {

int __errno;

void NMI_Handler() { }
void HardFault_Handler() { while (1); }
void MemManage_Handler() { while (1); }
void BusFault_Handler() { while (1); }
void UsageFault_Handler() { while (1); }
void SVC_Handler() { }
void DebugMon_Handler() { }
void PendSV_Handler() { }


// gets called every 0.125 ms or something
void SysTick_Handler() { 
  counter++;

  // a little LED animation for fun
  for(int i=0; i<2; i++) {
    leds.set(i, ((counter + i) & 166) > 127, ((counter+i*64) & 327) > 127);
  }
  leds.Write();  
}

}

// from rings/dsp/dsp.h:
const size_t kMaxBlockSize = 24;
static const float kSampleRate = 48000.0f;

float in[kMaxBlockSize];
float out[kMaxBlockSize];
float aux[kMaxBlockSize];


void FillBuffer(Codec::Frame* input, Codec::Frame* output, size_t size) {

  float freq = adc.float_value(ADC_CHANNEL_POT_FREQUENCY);
  adc.Convert();

  for (size_t i = 0; i < size; ++i) {
    float in_sample = static_cast<float>(input[i].r) / 32768.0f; // only right input goes to the panel on rings

    float out = in_sample * freq; // freq knob attenuates audio signal

    output[i].l = Clip16(static_cast<int32_t>(out * 32768.0f));
    output[i].r = Clip16(static_cast<int32_t>(out * 32768.0f));
  }
}

void Init() {
  System sys;
  Version version;
  
  sys.Init(true);
  version.Init();

  leds.Init();
  adc.Init();
  
  if (!codec.Init(!version.revised(), kSampleRate)) {
    while(1);
  }
  if (!codec.Start(kMaxBlockSize, &FillBuffer)) {
    while(1);
  }
  codec.set_line_input_gain(22);
  sys.StartTimers();
}

int main(void) {
  Init();
  while (1);
}