cpu/esp8266: reset tool to allow automatic tests

boards/common/esp8266/Makefile.include

@@ -4,5 +4,5 @@ PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.SLAB_USBtoUART*)))
 include $(RIOTMAKE)/tools/serial.inc.mk
 
 # reset tool configuration
-RESET ?= esptool.py
-RESET_FLAGS ?= --port $(PROG_DEV) --before default_reset run
+RESET ?= $(RIOTTOOLS)/esptool/espreset.py
+RESET_FLAGS ?= --port $(PROG_DEV)

cpu/esp8266/Makefile.include

@@ -172,7 +172,7 @@ FLASH_FREQ = 26m   # FIX configuration, DO NOT CHANGE
 FLASH_SIZE ?= 1MB
 FLASHDEPS  += preflash
 
-PREFLASHER ?= $(RIOTBASE)/dist/tools/esptool/esptool.py
+PREFLASHER ?= $(RIOTTOOLS)/esptool/esptool.py
 PREFFLAGS  = --chip esp8266 elf2image
 PREFFLAGS += --flash_mode $(FLASH_MODE) --flash_size $(FLASH_SIZE)
 PREFFLAGS += --flash_freq $(FLASH_FREQ) --version 3
@@ -207,7 +207,7 @@ else
     export PROGRAMMER_SPEED ?= 460800
     FLASHER = $(RIOTBASE)/dist/tools/esptool/esptool.py
     FFLAGS += --chip esp8266 --port $(PROG_DEV) --baud $(PROGRAMMER_SPEED)
-    FFLAGS += --before default_reset --after hard_reset write_flash -z
+    FFLAGS += --before default_reset write_flash -z
     FFLAGS += --flash_size detect
     FFLAGS += --flash_mode $(FLASH_MODE) --flash_freq $(FLASH_FREQ)
     FFLAGS += 0x0000 $(RIOTCPU)/$(CPU)/bin/$(BOOTLOADER)

dist/tools/esptool/espreset.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright (C) 2019  Gunar Schorcht <gunar@schorcht.net>
+#               2014  Oliver Hahm <oliver.hahm@inria.fr>
+#
+# 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 2.1 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
+
+import serial
+import sys
+import time
+import argparse
+
+try:
+    serial.Serial
+except AttributeError:
+    print("\033[1;37;41m\n")
+    print("Something went terribly wrong when loading the pyserial package.")
+    print("There is a good chance that you installed the 'serial' package instead")
+    print("of 'pyserial'. Try running 'pip uninstall serial && pip install pyserial'")
+    print("\033[0m")
+    sys.exit(1)
+
+# default serial port
+defaultport = "/dev/ttyUSB0"
+
+# default baudrate for serial connection
+defaultbaud = 115200
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="espreset - ESP reset program")
+    parser.add_argument("-p", "--port",
+                        help="Specifies the serial port to use, default is %s"
+                        % defaultport,
+                        default=defaultport)
+    parser.add_argument("-b", "--baudrate",
+                        help="Specifies baudrate for the serial port, default "
+                        "is %s" % defaultbaud,
+                        default=defaultbaud)
+
+    args = parser.parse_args()
+
+    ser = serial.Serial(port=args.port, dsrdtr=0, rtscts=0)
+    ser.baudrate = args.baudrate
+    # set RST low and GPIO0 high
+    ser.setRTS(1)
+    ser.setDTR(0)
+    # keep the RST line low for 0.1 seconds
+    time.sleep(0.1)
+    # set the RST high
+    ser.setRTS(1)
+    ser.setDTR(1)
+    # wait 1 second for boot
+    time.sleep(1)
+    sys.exit(0)