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#!/usr/bin/env python
"""
Abstraction layer for simple control circuits.
The simple control circuit can control the reset
signal via GPIO.0 and the maskrom signal via GPIO.1.
"""
__copyright__ = 'Copyright (C) 2019 Theobroma Systems Design und Consulting GmbH'
__license__ = 'MIT'
import sys
import time
import command_processor
import cp210x_controller
# Power supply GPIO
GPIO_RESET = 0
VALUE_RESET_DEASSERT = 0
VALUE_RESET_ASSERT = 1
# Maskrom (BIOS disable) GPIO
GPIO_MASKROM = 1
VALUE_MASKROM_DEASSERT = 0
VALUE_MASKROM_ASSERT = 1
def invert_reset():
global VALUE_RESET_DEASSERT
global VALUE_RESET_ASSERT
VALUE_RESET_DEASSERT = 1
VALUE_RESET_ASSERT = 0
def invert_maskrom():
global VALUE_MASKROM_DEASSERT
global VALUE_MASKROM_ASSERT
VALUE_MASKROM_DEASSERT = 1
VALUE_MASKROM_ASSERT = 0
def do_status(dev):
resetstate = cp210x_controller.get_gpio(dev, GPIO_RESET)
bootmode = cp210x_controller.get_gpio(dev, GPIO_MASKROM)
print "Board is {} ({})".format(
("running" if reset == RESETSTATE_DEASSERTED else "in reset"),
("normal boot" if bootmode == VALUE_MASKROM_DEASSERTED else "boot to maskrom"))
def do_reset_assert(dev):
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
def do_reset_deassert(dev):
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
def do_reset(dev):
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
time.sleep(0.3)
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
def do_normalboot(dev):
cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
def do_maskrom(dev):
cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_ASSERT)
def do_reset_to_normal(dev):
cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
time.sleep(0.3)
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
def do_reset_to_maskrom(dev):
cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_ASSERT)
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
time.sleep(0.3)
cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
time.sleep(0.3)
cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
def main(product_string):
options_dict = {
'--invert-reset': (invert_reset,
'invert voltage level of reset line'),
'--invert-maskrom': (invert_maskrom,
'invert voltage level of maskrom line')
}
command_dict = {
'status': (do_status,
'show status of attached board'),
'reset-assert': (do_reset_assert,
'assert the reset line'),
'reset-deassert': (do_reset_deassert,
'deassert the reset line'),
'reset': (do_reset,
'assert the reset line for 300 ms'),
'normalboot': (do_normalboot,
'set bootmode to normal boot'),
'maskrom': (do_maskrom,
'set bootmode to maskrom'),
'reset-to-normal': (do_reset_to_normal,
'reset with normal boot target'),
'reset-to-maskrom': (do_reset_to_maskrom,
'reset to maskrom')
}
# Create argparser object
cp = command_processor.CommandProcessor(product_string, options_dict,
command_dict)
# Valiate command line arguments and commands
cp.validate_commandline(sys.argv[1:])
# Start executing the commands
cp.run()
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