From 3017ff1554c5e7e91c4cbea3dbccd9020c885225 Mon Sep 17 00:00:00 2001
From: Tobias Hienzsch <post@tobias-hienzsch.de>
Date: Thu, 15 Feb 2024 06:00:51 +0100
Subject: [PATCH] Add Hermas project

---
 .github/workflows/package.yml |  1 +
 CMakeLists.txt                |  1 +
 src/hermas/CMakeLists.txt     |  6 ++++
 src/hermas/README.md          |  7 +++++
 src/hermas/main.cpp           | 55 +++++++++++++++++++++++++++++++++++
 src/hermas/signal_chain.mmd   | 28 ++++++++++++++++++
 6 files changed, 98 insertions(+)
 create mode 100644 src/hermas/CMakeLists.txt
 create mode 100644 src/hermas/README.md
 create mode 100644 src/hermas/main.cpp
 create mode 100644 src/hermas/signal_chain.mmd

diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index 4c4c15e..c439d28 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -43,6 +43,7 @@ jobs:
           mkdir firmware
           cp build/src/kyma/Release/kyma.bin firmware
           cp build/src/hades/Release/hades.bin firmware
+          cp build/src/hermas/Release/hermas.bin firmware
           cp build/src/astra/Release/astra.bin firmware
 
       - name: Upload coverage artifacts
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9b0eb9..9742830 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,7 @@ if(CMAKE_CROSSCOMPILING)
     add_subdirectory(src/astra)
     add_subdirectory(src/benchmark)
     add_subdirectory(src/hades)
+    add_subdirectory(src/hermas)
     add_subdirectory(src/kyma)
 endif()
 
diff --git a/src/hermas/CMakeLists.txt b/src/hermas/CMakeLists.txt
new file mode 100644
index 0000000..3a65ac4
--- /dev/null
+++ b/src/hermas/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.23...3.27)
+project(hermas)
+
+add_baremetal_executable(${PROJECT_NAME} ${LINKER_SCRIPT})
+target_sources(${PROJECT_NAME} PRIVATE main.cpp)
+target_link_libraries(${PROJECT_NAME} PRIVATE daisy gritwave::eurorack)
diff --git a/src/hermas/README.md b/src/hermas/README.md
new file mode 100644
index 0000000..7b3679b
--- /dev/null
+++ b/src/hermas/README.md
@@ -0,0 +1,7 @@
+# Hermas
+
+## Features
+
+- Transient Shaper
+  - Output gain control signal
+  - Sum of attack & sustain, or one only via switch/button
diff --git a/src/hermas/main.cpp b/src/hermas/main.cpp
new file mode 100644
index 0000000..78571d5
--- /dev/null
+++ b/src/hermas/main.cpp
@@ -0,0 +1,55 @@
+#include <grit/audio/stereo.hpp>
+#include <grit/math/remap.hpp>
+#include <grit/unit/decibel.hpp>
+
+#include <daisy_patch_sm.h>
+
+namespace hermas {
+
+constexpr auto blockSize  = 16U;
+constexpr auto sampleRate = 96'000.0F;
+
+auto patch = daisy::patch_sm::DaisyPatchSM{};
+
+auto audioCallback(
+    daisy::AudioHandle::InterleavingInputBuffer in,
+    daisy::AudioHandle::InterleavingOutputBuffer out,
+    size_t size
+) -> void
+{
+    patch.ProcessAllControls();
+
+    auto const input  = grit::StereoBlock<float const>{in, size};
+    auto const output = grit::StereoBlock<float>{out, size};
+
+    auto const gainLeftKnob  = patch.GetAdcValue(daisy::patch_sm::CV_1);
+    auto const gainRightKnob = patch.GetAdcValue(daisy::patch_sm::CV_2);
+
+    auto const gainLeft  = grit::fromDecibels(grit::remap(gainLeftKnob, -30.0F, 6.0F));
+    auto const gainRight = grit::fromDecibels(grit::remap(gainRightKnob, -30.0F, 6.0F));
+
+    for (size_t i = 0; i < size; ++i) {
+        auto const inLeft  = input(0, i);
+        auto const inRight = input(1, i);
+
+        auto const leftGained  = inLeft * gainLeft;
+        auto const rightGained = inRight * gainRight;
+
+        output(0, i) = leftGained + rightGained;
+        output(1, i) = leftGained + rightGained;
+    }
+}
+
+}  // namespace hermas
+
+auto main() -> int
+{
+    using namespace hermas;
+
+    patch.Init();
+    patch.SetAudioSampleRate(sampleRate);
+    patch.SetAudioBlockSize(blockSize);
+    patch.StartAudio(audioCallback);
+
+    while (true) {}
+}
diff --git a/src/hermas/signal_chain.mmd b/src/hermas/signal_chain.mmd
new file mode 100644
index 0000000..16ba458
--- /dev/null
+++ b/src/hermas/signal_chain.mmd
@@ -0,0 +1,28 @@
+---
+title: Gritwave Hermás
+---
+flowchart LR
+    subgraph Transient[TransientShaper]
+        Attack
+        Sustain
+        Strength
+        Smooth
+        SelectOut[Select CV Output]
+    end
+    
+    Knob1((Knob 1)) --> Attack
+    Knob2((Knob 2)) --> Sustain
+    Knob3((Knob 3)) --> Strength
+    Knob4((Knob 4)) --> Smooth
+  
+    %% Button
+    Switch --> SelectOut
+
+    CV5(CV5) --> Attack
+    CV6(CV6) --> Sustain
+    CV7(CV7) --> Strength
+    CV8(CV8) --> Smooth
+
+    Input --> |Signal| Transient
+    Transient --> |Signal| Output
+    Transient --> |Transient Gain| CVOut(CV Out)
\ No newline at end of file