Basic build environment for Teensy 4.0 programs

8 files changed, 194 insertions, 0 deletions

diff --git a/Makefile.lib b/Makefile.lib
new file mode 100644
index 0000000..ce5787c
--- /dev/null
+++ b/Makefile.lib
@@ -0,0 +1,20 @@
+MCU = IMXRT1062
+MCU_DEF = ARDUINO_TEENSY40
+
+OPTIONS = -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH
+OPTIONS += -D__$(MCU)__ -DARDUINO=10813 -DTEENSYDUINO=154 -D$(MCU_DEF)
+
+CPU_OPTIONS = -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -mthumb
+
+CPPFLAGS = -Wall -g -O2 $(CPU_OPTIONS) -MMD $(OPTIONS) -I. -ffunction-sections -fdata-sections -I.
+CXXFLAGS = -std=gnu++14 -felide-constructors -fno-exceptions -fpermissive -fno-rtti -Wno-error=narrowing
+
+C_FILES := $(wildcard *.c)
+CPP_FILES := $(wildcard *.cpp)
+OBJS := $(C_FILES:.c=.o) $(CPP_FILES:.cpp=.o)
+
+C_FILES   := $(wildcard *.c)
+CPP_FILES := $(wildcard *.cpp)
+OBJS      := $(C_FILES:.c=.o) $(CPP_FILES:.cpp=.o)
+
+all: $(OBJS)
\ No newline at end of file
diff --git a/core.nix b/core.nix
new file mode 100644
index 0000000..6a98e55
--- /dev/null
+++ b/core.nix
@@ -0,0 +1,42 @@
+{ pkgs, ... }:
+
+pkgs.stdenvNoCC.mkDerivation rec {
+  name = "teensy-core";
+  version = "1.54";
+
+  src = pkgs.fetchFromGitHub {
+    owner = "PaulStoffregen";
+    repo = "cores";
+    rev = "${version}";
+    sha256 = "6IXKPVc06WCjJDOnDFOOqjPZSt4UhRW7LHyblEaZ7fw=";
+  };
+
+  buildInputs = with pkgs; [
+    binutils
+    gcc-arm-embedded
+  ];
+
+  buildPhase = ''
+    export CC=arm-none-eabi-gcc
+    export CXX=arm-none-eabi-g++
+
+    pushd teensy4
+    rm main.cpp
+    cp ${./Makefile.lib} Makefile
+    make
+    ar rvs libteensy-core.a *.o
+    popd
+  '';
+
+  installPhase = ''
+    mkdir -p $out/{include,lib}
+    pushd teensy4
+    cp -r *.h $out/include/
+    cp -r avr $out/include/
+    cp -r debug $out/include/
+    cp -r util $out/include/
+    cp libteensy-core.a $out/lib/
+    cp imxrt1062.ld $out/lib/
+    popd
+  '';
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..b87a192
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1633709683,
+        "narHash": "sha256-KVJEToVd6SuUqc2XFIpfSjns07orqEWzIq9AcF/SIf8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ce7a1190a0fa4ba3465b5f5471b08567060ca14c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..03109f4
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,19 @@
+{
+  description = "Build environment for Teensy 4.0";
+
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs/nixos-21.05;
+  };
+
+  outputs = { self, nixpkgs, ... }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs { inherit system; };
+
+    teensy-core = import ./core.nix { inherit pkgs; };
+    teensy-test = import ./test.nix { inherit pkgs teensy-core; };
+  in {
+    packages.${system} = {
+      inherit teensy-core teensy-test;
+    };
+  };
+}
diff --git a/test.nix b/test.nix
new file mode 100644
index 0000000..e6329a8
--- /dev/null
+++ b/test.nix
@@ -0,0 +1,28 @@
+{ pkgs, teensy-core, ... }:
+
+pkgs.stdenv.mkDerivation rec {
+  name = "teensy-test";
+
+  src = ./test;
+
+  buildInputs = with pkgs; [
+    gcc-arm-embedded
+    teensy-core
+  ];
+
+  buildPhase = ''
+    export CC=arm-none-eabi-gcc
+    export CXX=arm-none-eabi-g++
+    export OBJCOPY=arm-none-eabi-objcopy
+    export SIZE=arm-none-eabi-size
+
+    export LDFLAGS="-T${teensy-core}/lib/imxrt1062.ld -L${teensy-core}/lib"
+
+    make
+  '';
+
+  installPhase = ''
+    mkdir $out
+    cp *.hex $out/
+  '';
+}
diff --git a/test/Makefile b/test/Makefile
new file mode 100644
index 0000000..0891b70
--- /dev/null
+++ b/test/Makefile
@@ -0,0 +1,26 @@
+MCU = IMXRT1062
+MCU_DEF = ARDUINO_TEENSY40
+
+OPTIONS = -DF_CPU=600000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH
+OPTIONS += -D__$(MCU)__ -DARDUINO=10813 -DTEENSYDUINO=154 -D$(MCU_DEF)
+
+CPU_OPTIONS = -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -mthumb
+
+CPPFLAGS = $(NIX_CFLAGS_COMPILE) -Wall -g -O2 $(CPU_OPTIONS) -MMD $(OPTIONS) -I. -ffunction-sections -fdata-sections
+CXXFLAGS = -std=gnu++20 -felide-constructors -fno-exceptions -fpermissive -fno-rtti -Wno-error=narrowing
+
+LDFLAGS += -Os -Wl,--gc-sections,--relax $(CPU_OPTIONS)
+
+LIBS = -lm -lstdc++ -lteensy-core
+
+CPP_FILES := $(wildcard *.cpp)
+TARGETS := $(CPP_FILES:.cpp=.hex)
+
+%.elf: %.o
+	$(CC) $(LDFLAGS) -o $@ $< $(LIBS)
+
+%.hex: %.elf
+	$(SIZE) $<
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+all: $(TARGETS)
diff --git a/test/blink.cpp b/test/blink.cpp
new file mode 100644
index 0000000..ec7b3bd
--- /dev/null
+++ b/test/blink.cpp
@@ -0,0 +1,13 @@
+#include <Arduino.h>
+
+extern "C" int main(void) {
+  pinMode(13, OUTPUT);
+
+  while (true) {
+    digitalWrite(13, HIGH);
+    delay(500);
+    digitalWrite(13, LOW);
+    delay(500);
+  }
+}
+
diff --git a/test/counter.cpp b/test/counter.cpp
new file mode 100644
index 0000000..680e233
--- /dev/null
+++ b/test/counter.cpp
@@ -0,0 +1,19 @@
+#include <Arduino.h>
+
+extern "C" int main(void) {
+  for (unsigned iPin=16; iPin <= 20; ++iPin) {
+    pinMode(iPin, OUTPUT);
+  }
+
+  std::size_t i = 0;
+
+  while (true) {
+    digitalWrite(16, (i %  2) >  0);
+    digitalWrite(17, (i %  4) >  1);
+    digitalWrite(18, (i %  8) >  3);
+    digitalWrite(19, (i % 16) >  7);
+    digitalWrite(20, (i % 32) > 15);
+    delay(analogRead(7));
+    i++;
+  }
+}