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Add autoreset feature via DTR control line

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This is inspired by Arduino.  Directly before connect, DTR is asserted
for 0.5 seconds and then deasserted again.  With a small external
circuit, the MCU can be power-cycled with this control signal.
In case the MCU draws very little power, it may even be possible to
supply power directly from the DTR pin.
This commit is contained in:
Grigori Goronzy 2016-04-02 23:00:07 +02:00
parent 41cabb587b
commit 372f854c77
2 changed files with 15 additions and 4 deletions
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3
stcgal/frontend.py
View File

@ -117,7 +117,7 @@ class StcGal:
self.protocol.disconnect()
def run(self):
try: self.protocol.connect()
try: self.protocol.connect(autoreset=self.opts.autoreset)
except KeyboardInterrupt:
sys.stdout.flush();
print("interrupted")
@ -174,6 +174,7 @@ def cli():
description="stcgal %s - an STC MCU ISP flash tool\n(C) 2014-2015 Grigori Goronzy\nhttps://github.com/grigorig/stcgal" %stcgal.__version__)
parser.add_argument("code_image", help="code segment file to flash (BIN/HEX)", type=argparse.FileType("rb"), nargs='?')
parser.add_argument("eeprom_image", help="eeprom segment file to flash (BIN/HEX)", type=argparse.FileType("rb"), nargs='?')
parser.add_argument("-a", "--autoreset", help="cycle power automatically by asserting DTR", action="store_true")
parser.add_argument("-P", "--protocol", help="protocol version", choices=["stc89", "stc12a", "stc12", "stc15a", "stc15"], default="stc12")
parser.add_argument("-p", "--port", help="serial port device", default="/dev/ttyUSB0")
parser.add_argument("-b", "--baud", help="transfer baud rate (default: 19200)", type=BaudType(), default=19200)

16
stcgal/protocols.py
View File

@ -728,7 +728,7 @@ class StcBaseProtocol:
def set_option(self, name, value):
self.options.set_option(name, value)
def connect(self):
def connect(self, autoreset=False):
"""Connect to MCU and initialize communication.
Set up serial port, send sync sequence and get part info.
@ -746,8 +746,18 @@ class StcBaseProtocol:
# avoid glitches if there is something in the input buffer
self.ser.flushInput()
print("Waiting for MCU, please cycle power: ", end="")
sys.stdout.flush()
if autoreset:
print("Cycling power: ", end="")
sys.stdout.flush()
self.ser.setDTR(True)
time.sleep(0.5)
self.ser.setDTR(False)
print("done")
print("Waiting for MCU: ", end="")
sys.stdout.flush()
else:
print("Waiting for MCU, please cycle power: ", end="")
sys.stdout.flush()
# send sync, and wait for MCU response
# ignore errors until we see a valid response