Esp8266-Arduino-Makefile

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Esp8266-Arduino-Makefile †

• thunderace/Esp8266-Arduino-Makefile: Makefile to build arduino code for ESP8266 under linux (tested on debian X64)

ツールのインストール先 †

• C:\Users\nari\AppData\Local\Arduino15\packages\esp8266

• リンカースクリプトの在処
  • Tc:/Users/nari/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/tools/sdk/ld/{eagle.flash.4m.ld, eagle.app.v6.common.ld}

PROGMEM †

• 起点: /c/Users/nari/AppData/Local/Arduino15/packages/esp8266

• ./hardware/esp8266/2.3.0/cores/esp8266/pgmspace.h:

  #define PROGMEM     ICACHE_RODATA_ATTR

• ./hardware/esp8266/2.3.0/tools/sdk/include/c_types.h:

  #define ICACHE_RODATA_ATTR  __attribute__((section(".irom.text")))

• ./hardware/esp8266/2.3.0/cores/esp8266/WString.h:

  #define FPSTR(pstr_pointer) (reinterpret_cast<const __FlashStringHelper *>(pstr_pointer))

• ./hardware/esp8266/2.3.0/cores/esp8266/WString.h:

  // an abstract class used as a means to proide a unique pointer type
  // but really has no body
  class __FlashStringHelper;

• ./hardware/esp8266/2.3.0/cores/esp8266/pgmspace.h

  // flash memory must be read using 32 bit aligned addresses else a processor
  // exception will be triggered
  // order within the 32 bit values are
  // --------------
  // b3, b2, b1, b0
  //     w1,     w0

  • pgm_read_byte, pgm_read_wordを使おう