flake.nix

@@ -289,10 +289,6 @@
           path = ./templates/dev/rs-hello;
           description = "Rust hello world template.";
         };
-        stm32-blink = {
-          path = ./templates/dev/esp-blink;
-          description = "STM32G4 blink template with libopencm3.";
-        };
       };
     };
 }

templates/dev/stm32-blink/.envrc

@@ -1 +0,0 @@
-use flake

templates/dev/stm32-blink/.gitignore

@@ -1,5 +0,0 @@
-.cache/
-.direnv/
-build/
-compile_commands.json
-result

templates/dev/stm32-blink/Makefile

@@ -1,67 +0,0 @@
-PREFIX   ?= arm-none-eabi-
-CC        = $(PREFIX)gcc
-OBJCOPY   = $(PREFIX)objcopy
-SIZE      = $(PREFIX)size
-
-PNAME    := blink
-BUILD    := build
-
-# libopencm3 is provided by the Nix shell
-OPENCM3_DIR ?= ""
-
-SRCS     := src/main.c
-OBJS     := $(addprefix $(BUILD)/, $(SRCS:.c=.o))
-
-# STM32G4
-CPU_FLAGS := -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16
-
-CFLAGS   := $(CPU_FLAGS) \
-            -DSTM32G4 \
-            -Os -Wall -Wextra \
-            -ffunction-sections -fdata-sections \
-            -I$(OPENCM3_DIR)/include
-
-LDFLAGS  := $(CPU_FLAGS) \
-            -nostartfiles \
-            -Wl,--gc-sections \
-            -L$(OPENCM3_DIR)/lib \
-            -lopencm3_stm32g4
-
-ELF := $(BUILD)/$(PNAME).elf
-BIN := $(BUILD)/$(PNAME).bin
-HEX := $(BUILD)/$(PNAME).hex
-
-.PHONY: all clean flash size
-
-all: $(BIN) $(HEX) size
-
-$(BUILD)/%.o: %.c
-	@mkdir -p $(@D)
-	$(CC) $(CFLAGS) -c $< -o $@
-
-LDSCRIPT := $(BUILD)/stm32g474xe.ld
-
-$(LDSCRIPT):
-	@mkdir -p $(@D)
-	$(CC) -I$(OPENCM3_DIR)/include $(shell python3 $(OPENCM3_DIR)/scripts/genlink.py $(OPENCM3_DIR)/ld/devices.data stm32g474xe DEFS) -P -E $(OPENCM3_DIR)/ld/linker.ld.S -o $@
-
-$(ELF): $(OBJS) $(LDSCRIPT)
-	$(CC) $(OBJS) $(LDFLAGS) -T$(LDSCRIPT) -o $@
-
-$(BIN): $(ELF)
-	$(OBJCOPY) -O binary $< $@
-
-$(HEX): $(ELF)
-	$(OBJCOPY) -O ihex $< $@
-
-size: $(ELF)
-	$(SIZE) $<
-
-flash: $(BIN)
-	openocd \
-	  -f interface/stlink.cfg \
-	  -f target/stm32g4x.cfg \
-	  -c "program $(BIN) verify reset exit 0x08000000"
-
-clean:
-	rm -rf $(BUILD)

templates/dev/stm32-blink/README.md

@@ -1,28 +0,0 @@
-# STM32G4 blink template
-
-Blinks the LD2 LED (PA5) on a [Nucleo-G474RE](https://www.st.com/en/evaluation-tools/nucleo-g474re.html) using [libopencm3](https://github.com/libopencm3/libopencm3).
-
-Set `BLINK_PORT` / `BLINK_PIN` for your board in [`src/main.c`](./src/main.c).
-
-## Toolchain
-
-The Nix dev shell provides:
-
-- `arm-none-eabi-gcc` (via `gcc-arm-embedded`)
-- `openocd` for flashing and debugging
-- `stlink` utilities (`st-flash`, `st-info`)
-- `libopencm3` built for `stm32/g4` (exposed as `$LIBOPENCM3_DIR`)
-
-## Build
-
-```bash
-make
-```
-
-## Flash
-
-```bash
-make flash
-```
-
-This uses OpenOCD with the built-in ST-Link interface config.

templates/dev/stm32-blink/build.sh

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-make clean
-mkdir -p build
-bear -- make

templates/dev/stm32-blink/flake.nix

@@ -1,161 +0,0 @@
-{
-  description = "A blink template for STM32G4";
-
-  inputs = {
-    nixpkgs.url = "nixpkgs/nixpkgs-unstable";
-    utils.url = "github:numtide/flake-utils";
-    libopencm3-src = {
-      url = "github:libopencm3/libopencm3";
-      flake = false;
-    };
-    pre-commit-hooks = {
-      url = "github:cachix/pre-commit-hooks.nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-  };
-
-  outputs =
-    {
-      self,
-      nixpkgs,
-      utils,
-      libopencm3-src,
-      pre-commit-hooks,
-      ...
-    }:
-    {
-      overlays.default = final: prev: {
-        libopencm3-stm32 = final.stdenvNoCC.mkDerivation {
-          pname = "libopencm3-stm32";
-          version = "latest";
-
-          src = libopencm3-src;
-
-          postPatch = ''
-            patchShebangs scripts
-          '';
-
-          nativeBuildInputs = [
-            final.gcc-arm-embedded
-            final.python3
-            final.gnumake
-          ];
-
-          enableParallelBuilding = true;
-
-          makeFlags = [
-            "PREFIX=arm-none-eabi-"
-          ];
-
-          TARGETS = "stm32/f0 stm32/f1 stm32/f2 stm32/f3 stm32/f4 stm32/f7 stm32/l0 stm32/l1 stm32/l4 stm32/g0 stm32/g4 stm32/h7 stm32/u5";
-
-          installPhase = ''
-            runHook preInstall
-
-            mkdir -p $out
-            cp -r include lib mk scripts ld $out/
-
-            patchShebangs $out/scripts
-
-            runHook postInstall
-          '';
-
-          meta = with final.lib; {
-            description = "Open source ARM Cortex-M microcontroller library (STM32 targets)";
-            homepage = "http://libopencm3.org/";
-            license = licenses.lgpl3Plus;
-            platforms = platforms.all;
-          };
-        };
-      };
-    }
-    // utils.lib.eachDefaultSystem (
-      system:
-      let
-        pkgs = import nixpkgs {
-          inherit system;
-          overlays = [ self.overlays.default ];
-        };
-        pname = "blink";
-        version = "0.1.0";
-      in
-      {
-        packages = {
-          inherit (pkgs) libopencm3-stm32;
-          default = pkgs.stdenvNoCC.mkDerivation {
-            inherit pname version;
-            src = pkgs.lib.cleanSource ./.;
-
-            nativeBuildInputs = with pkgs; [
-              gcc-arm-embedded
-              gnumake
-              python3
-            ];
-
-            makeFlags = [
-              "OPENCM3_DIR=${pkgs.libopencm3-stm32}"
-              "PREFIX=arm-none-eabi-"
-            ];
-
-            installPhase = ''
-              runHook preInstall
-              mkdir -p $out/bin
-              cp build/${pname}.elf $out/bin/
-              cp build/${pname}.bin $out/bin/
-              cp build/${pname}.hex $out/bin/
-              runHook postInstall
-            '';
-          };
-        };
-
-        devShells.default =
-          let
-            # FIXME: 'gnu/stubs-32.h' file not found
-            clangdWrapper = pkgs.writeShellScriptBin "clangd" ''
-              exec ${pkgs.clang-tools}/bin/clangd \
-                --query-driver=${pkgs.gcc-arm-embedded}/bin/arm-none-eabi-* \
-                "$@"
-            '';
-          in
-          pkgs.mkShell {
-            name = "stm32-blink";
-            packages = self.packages.${system}.default.nativeBuildInputs ++ [
-              clangdWrapper
-
-              pkgs.bear
-              pkgs.openocd
-              pkgs.stlink
-            ];
-            OPENCM3_DIR = pkgs.libopencm3-stm32;
-            PREFIX = "arm-none-eabi-";
-          };
-
-        formatter =
-          let
-            inherit (self.checks.${system}.pre-commit-check.config) package configFile;
-            script = ''
-              ${pkgs.lib.getExe package} run --all-files --config ${configFile}
-            '';
-          in
-          pkgs.writeShellScriptBin "pre-commit-run" script;
-
-        checks = {
-          build-packages = pkgs.linkFarm "flake-packages-${system}" self.packages.${system};
-
-          pre-commit-check = pre-commit-hooks.lib.${system}.run {
-            src = ./.;
-            hooks = {
-              nixfmt.enable = true;
-              clang-format = {
-                enable = true;
-                types_or = pkgs.lib.mkForce [
-                  "c"
-                  "c++"
-                ];
-              };
-            };
-          };
-        };
-      }
-    );
-}

templates/dev/stm32-blink/src/main.c

@@ -1,50 +0,0 @@
-#include <libopencm3/cm3/systick.h>
-#include <libopencm3/stm32/gpio.h>
-#include <libopencm3/stm32/rcc.h>
-
-/* Nucleo-G474RE: LD2 is on PA5 */
-#define BLINK_PORT GPIOA
-#define BLINK_PIN GPIO5
-#define BLINK_PERIOD_MS 1000
-
-static volatile uint32_t s_ticks = 0;
-
-void sys_tick_handler(void) { s_ticks++; }
-
-static void delay_ms(uint32_t ms) {
-  uint32_t until = s_ticks + ms;
-  while (s_ticks < until)
-    ;
-}
-
-static void clock_setup(void) {
-  rcc_clock_setup_pll(&rcc_hsi_configs[RCC_CLOCK_3V3_170MHZ]);
-}
-
-static void systick_setup(void) {
-  /* 1 ms tick at 170 MHz core clock */
-  systick_set_reload(rcc_ahb_frequency / 1000 - 1);
-  systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
-  systick_counter_enable();
-  systick_interrupt_enable();
-}
-
-static void gpio_setup(void) {
-  rcc_periph_clock_enable(RCC_GPIOA);
-  gpio_mode_setup(BLINK_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, BLINK_PIN);
-  gpio_set_output_options(BLINK_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_LOW,
-                          BLINK_PIN);
-}
-
-int main(void) {
-  clock_setup();
-  systick_setup();
-  gpio_setup();
-
-  while (1) {
-    gpio_toggle(BLINK_PORT, BLINK_PIN);
-    delay_ms(BLINK_PERIOD_MS);
-  }
-
-  return 0;
-}