_# 我从github上下载了libopencm3的源码，编译的时候报错：

GENHDR efm32/efm32g/irq.json

:没有那个文件或目录

make【1】：***[efm32/efm32g/irq.json.genhdr] 错误127

请问如何解决**___

以下为Makefile文件：

##

## This file is part of the libopencm3 project.

##

## Copyright (C) 2009 Uwe Hermann

##

## This library is free software: you can redistribute it and/or modify

## it under the terms of the GNU Lesser General Public License as published by

## the Free Software Foundation, either version 3 of the License, or

## (at your option) any later version.

##

## This library is distributed in the hope that it will be useful,

## but WITHOUT ANY WARRANTY; without even the implied warranty of

## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

## GNU Lesser General Public License for more details.

##

## You should have received a copy of the GNU Lesser General Public License

## along with this library.  If not, see .

##

PREFIX      ?= arm-none-eabi

#PREFIX     ?= arm-elf

STYLECHECK      := scripts/checkpatch.pl

STYLECHECKFLAGS := --no-tree -f --terse --mailback

DESTDIR     ?= /usr/local

INCDIR      := $(DESTDIR)/$(PREFIX)/include

LIBDIR      := $(DESTDIR)/$(PREFIX)/lib

SHAREDIR    := $(DESTDIR)/$(PREFIX)/share/libopencm3/scripts

INSTALL     := install

space:=

space+=

SRCLIBDIR:= $(subst $(space),\$(space),$(realpath lib))

TARGETS:= stm32/f0 stm32/f1 stm32/f2 stm32/f3 stm32/f4 stm32/l0 stm32/l1 \

      lpc13xx lpc17xx lpc43xx/m4 lpc43xx/m0 lm3s lm4f \

      efm32/efm32tg efm32/efm32g efm32/efm32lg efm32/efm32gg \

      sam/3a sam/3n sam/3s sam/3u sam/3x \

      vf6xx

# Be silent per default, but 'make V=1' will show all compiler calls.

ifneq ($(V),1)

Q := @

# Do not print "Entering directory ...".

MAKEFLAGS += --no-print-directory

endif

IRQ_DEFN_FILES  := $(shell find . -name 'irq.json')

STYLECHECKFILES := $(shell find . -name '*.[ch]')

all: build

build: lib

%.genhdr:

    @printf "  GENHDR  $*\n";

    @./scripts/irq2nvic_h ./$*;

%.cleanhdr:

    @printf "  CLNHDR  $*\n";

    @./scripts/irq2nvic_h --remove ./$*

LIB_DIRS:=$(wildcard $(addprefix lib/,$(TARGETS)))

$(LIB_DIRS): $(IRQ_DEFN_FILES:=.genhdr)

    @printf "  BUILD   $@\n";

    $(Q)$(MAKE) --directory=$@ SRCLIBDIR="$(SRCLIBDIR)"

lib: $(LIB_DIRS)

    $(Q)true

install: lib

    @printf "  INSTALL headers\n"

    $(Q)$(INSTALL) -d $(INCDIR)/libopencm3

    $(Q)$(INSTALL) -d $(INCDIR)/libopencmsis

    $(Q)$(INSTALL) -d $(LIBDIR)

    $(Q)$(INSTALL) -d $(SHAREDIR)

    $(Q)cp -r include/libopencm3*.ld $(LIBDIR)

    @printf "  INSTALL scripts\n"

    $(Q)$(INSTALL) -m 0644 scripts/*.scr $(SHAREDIR)

html doc:

    $(Q)$(MAKE) -C doc html

clean: $(IRQ_DEFN_FILES:=.cleanhdr) $(LIB_DIRS:=.clean) $(EXAMPLE_DIRS:=.clean) doc.clean styleclean

%.clean:

    $(Q)if [ -d $* ]; then \

        printf "  CLEAN   $*\n"; \

        $(MAKE) -C $* clean SRCLIBDIR="$(SRCLIBDIR)" || exit $?; \

    fi;

stylecheck: $(STYLECHECKFILES:=.stylecheck)

styleclean: $(STYLECHECKFILES:=.styleclean)

# the cat is due to multithreaded nature - we like to have consistent chunks of text on the output

%.stylecheck: %

    $(Q)if ! grep -q "* It was generated by the irq2nvic_h script." $* ; then \

        $(STYLECHECK) $(STYLECHECKFLAGS) $* > $*.stylecheck; \

        if [ -s $*.stylecheck ]; then \

            cat $*.stylecheck; \

        else \

            rm -f $*.stylecheck; \

        fi; \

    fi;

%.styleclean:

    $(Q)rm -f $*.stylecheck;

LDTESTS     :=$(wildcard ld/tests/*.data)

genlinktests: $(LDTESTS:.data=.ldtest)

%.ldtest:

    @if ./scripts/genlinktest.sh $* >/dev/null; then\

        printf "  TEST  OK  : $*\n";        \

    else                        \

        printf "  TEST FAIL : $*\n";        \

    fi;

.PHONY: build lib $(LIB_DIRS) install doc clean generatedheaders cleanheaders stylecheck genlinktests

开始使用libopencm3来开发stm32很方便，但是当前该项目还在进行中，无法很顺心的使用，无奈在编译arm-none-eabi-gcc的时候没有编译官方库，只得下载stm32的官方库（V3.5），由于在gcc下的开发经验有限，卡在了启动文件（使用汇编编写）和链接脚本上了。好在stm32官方库中提供了启动文件（我使用的是startup_stm32f10x_md.s）和链接脚本(在gcc-ride7文件夹下的stm32f10x_flash_extsram.ld)，启动文件可以直接使用,但是链接脚本需要修改，首先要修改FLASH和RAM的起始地址和大小，还有最高堆栈地址_estack,根据自己的stm32f103c8分别修改成0x08000000,0x20000000,0x20004e20后编译可运行

其实现在对于gcc的这一套编译过程还不是很了解，还有汇编在C语言中的地位似乎还是非常重要的，通过研究链接脚本可以知道。

完成配置工作，接下来就是采用该库进行编程了，希望一起顺利，PWM产生-->PWM捕捉测量脉宽，先完成这个简单的工作把^_^