ampy commands are pending on windows 10 #71
Description
I want to share my experience how I (may be temporary) solve the ampy command pending issue.
Here is my problem and temporary solution for ampy command pending issue.
My environment
SW:
- windows 10 professional
- python 3.6.5
- ampy 1.0.8
- CP210x driver v10.1.4
HW:
- esp32-devkitc_v4
- firmware: esp32-20180511-v1.9.4.bin
Problem
- Pending
ampcommands such asls,put,get. Sometimes it success (onlyls) but most of execution Fails.
Finding the issue
I checkout the source and add the print on library and searched for the point where code was pending.
I Found that the code is pending at the line 189 of pyboard.py. The code is data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n>').
def enter_raw_repl(self):
# Brief delay before sending RAW MODE char if requests
if _rawdelay > 0:
time.sleep(_rawdelay)
self.serial.write(b'\r\x03\x03') # ctrl-C twice: interrupt any running program
# flush input (without relying on serial.flushInput())
n = self.serial.inWaiting()
while n > 0:
self.serial.read(n)
n = self.serial.inWaiting()
self.serial.write(b'\r\x01') # ctrl-A: enter raw REPL
data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n>') # line 189
if not data.endswith(b'raw REPL; CTRL-B to exit\r\n>'):
print(data)
raise PyboardError('could not enter raw repl')
self.serial.write(b'\x04') # ctrl-D: soft reset
data = self.read_until(1, b'soft reboot\r\n')
if not data.endswith(b'soft reboot\r\n'):
print(data)
raise PyboardError('could not enter raw repl')
# By splitting this into 2 reads, it allows boot.py to print stuff,
# which will show up after the soft reboot and before the raw REPL.
# Modification from original pyboard.py below:
# Add a small delay and send Ctrl-C twice after soft reboot to ensure
# any main program loop in main.py is interrupted.
time.sleep(0.5)
self.serial.write(b'\x03')
time.sleep(0.1) # (slight delay before second interrupt
self.serial.write(b'\x03')
# End modification above.
data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n')
if not data.endswith(b'raw REPL; CTRL-B to exit\r\n'):
print(data)
raise PyboardError('could not enter raw repl')I also inspected the inside of self.read_util function but the most suspicious line was a line before. (self.serial.write(b'\r\x01') # ctrl-A: enter raw REPL).
I think For some reason, The develop board missed Ctl-A character and it may fail to enter raw repl mode.
So I modified the function as follows:
def enter_raw_repl(self):
# Brief delay before sending RAW MODE char if requests
if _rawdelay > 0:
time.sleep(_rawdelay)
self.serial.write(b'\r\x03\x03') # ctrl-C twice: interrupt any running program
# flush input (without relying on serial.flushInput())
n = self.serial.inWaiting()
while n > 0:
self.serial.read(n)
n = self.serial.inWaiting()
-> time.sleep(0.5)
self.serial.write(b'\r\x01') # ctrl-A: enter raw REPL
-> for i in range(4):
-> time.sleep(0.1)
-> self.serial.write(b'\x01') # send ctl-A for several times
-> self.serial.flushOutput()
data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n>')
# data = self.read_until(1, b'raw REPL; CTRL-B to exit\n>')
if not data.endswith(b'raw REPL; CTRL-B to exit\r\n>'):
print(data)
raise PyboardError('could not enter raw repl')
-> self.serial.flushInput()
self.serial.write(b'\x04') # ctrl-D: soft reset
data = self.read_until(1, b'soft reboot\r\n')
if not data.endswith(b'soft reboot\r\n'):
print(data)
raise PyboardError('could not enter raw repl')
# By splitting this into 2 reads, it allows boot.py to print stuff,
# which will show up after the soft reboot and before the raw REPL.
# Modification from original pyboard.py below:
# Add a small delay and send Ctrl-C twice after soft reboot to ensure
# any main program loop in main.py is interrupted.
time.sleep(0.5)
self.serial.write(b'\x03')
time.sleep(0.1) # (slight delay before second interrupt
self.serial.write(b'\x03')
# End modification above.
data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n')
if not data.endswith(b'raw REPL; CTRL-B to exit\r\n'):
print(data)
raise PyboardError('could not enter raw repl')And the commands works well.
My opinion is that many pending issues are came from failing to enter the raw_repl mode.
It is just temporal patch and until now i have no idea more proper way to solve it.