Initial commit

.envrc

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+use flake

.gitignore

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+.direnv
+result

base/include/base.h

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+
+#ifndef __BASE_H__
+#define __BASE_H__
+
+typedef struct IO_PIN {
+    volatile uint8_t *port;
+    uint8_t pin;
+} io_pin_t;
+
+inline void set_pin(io_pin_t *pin) {
+    *(pin->port) |= 1 << pin->pin;
+}
+
+inline void clear_pin(io_pin_t *pin) {
+    *(pin->port) &= 0xff ^ (1 << pin->pin);
+}
+
+
+#endif

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1649944829,
+        "narHash": "sha256-wjOgLfjCdyoRamMOrVJceeDJk4LvJsQOxBoT3k16/7Q=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2f06b87f64bc06229e05045853e0876666e1b023",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-21.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Wearables";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-21.11";
+  };
+
+  outputs = { self, nixpkgs }:
+    let 
+      version = builtins.string 0 8 self.lastModifiedDate;
+      supportedSystems = [ "x86_64-linux" "avr-none" ];
+    in
+    {
+      /*
+      packages.base."x86_64-linux" =
+        let pkgs = import nixpkgs { system = "x86_64-linux"; };
+        in pkgs.stdenv.mkDerivation rec {
+          name = "wearables-base";
+          src = "./base";
+
+          installPhase = ''
+            mkdir -p $out/include
+            cp include/base.h $out/include
+            '';
+        };
+        */
+
+      defaultPackage."x86_64-linux" =
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "hello";
+          src = ./.;
+
+          MCU = "attiny85";
+          CHIP_SELECT = "AVR_ATtiny85";
+          F_CPU = "8000000";
+          CFLAGS = ''-O -finline-functions -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -DF_CPU=${F_CPU} -std=gnu99 -D__${CHIP_SELECT}__=1 -mmcu=${MCU}'';
+
+          buildPhase = ''
+            set -x
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -I${src}/base/include/ -o main.elf ${src}/prototype/src/main.c
+            $OBJCOPY -O ihex main.elf main.hex
+            '';
+          installPhase = ''
+            mkdir $out
+            cp main.elf main.hex $out
+            '';
+        };
+
+      devShell."x86_64-linux" =
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          avr = with pkgs.pkgsCross.avr.buildPackages; [
+            binutils
+            gcc
+            avrdude
+          ];
+        in
+        pkgs.mkShell {
+          name = "Wearables-shell";
+          buildInputs = avr;
+        };
+    };
+}

flash-trinket

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+avrdude -c usbtiny -p attiny85 -U flash:w:$1:i; sleep 5; avrdude -c usbtiny -p attiny85 -D -U flash:w:$1:i

prototype/src/main.c

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+#include <avr/io.h>
+#include <util/delay.h>
+
+#include <base.h>
+
+int main (void) {
+    DDRB = 0x18;
+    PORTB = 0x00;
+
+    _delay_ms(500);
+
+    io_pin_t enable_pin = { .port = &PORTB, .pin = 3 };
+    io_pin_t data_pin = { .port = &PORTB, .pin = 4 };
+
+    set_pin(&enable_pin);
+    for (uint8_t i = 0; i < 10; i++) {
+        set_pin(&data_pin);
+        _delay_ms(500);
+        clear_pin(&data_pin);
+        _delay_ms(500);
+    }
+    clear_pin(&enable_pin);
+
+    while(1) {};
+}