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350 lines
12 KiB
350 lines
12 KiB
#!/usr/bin/env python
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"""
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pyboard interface
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This module provides the Pyboard class, used to communicate with and
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control the pyboard over a serial USB connection.
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Example usage:
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import pyboard
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pyb = pyboard.Pyboard('/dev/ttyACM0')
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Or:
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pyb = pyboard.Pyboard('192.168.1.1')
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Then:
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pyb.enter_raw_repl()
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pyb.exec('pyb.LED(1).on()')
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pyb.exit_raw_repl()
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Note: if using Python2 then pyb.exec must be written as pyb.exec_.
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To run a script from the local machine on the board and print out the results:
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import pyboard
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pyboard.execfile('test.py', device='/dev/ttyACM0')
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This script can also be run directly. To execute a local script, use:
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./pyboard.py test.py
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Or:
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python pyboard.py test.py
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"""
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import sys
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import time
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try:
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stdout = sys.stdout.buffer
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except AttributeError:
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# Python2 doesn't have buffer attr
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stdout = sys.stdout
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def stdout_write_bytes(b):
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b = b.replace(b"\x04", b"")
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stdout.write(b)
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stdout.flush()
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class PyboardError(BaseException):
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pass
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class TelnetToSerial:
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def __init__(self, ip, user, password, read_timeout=None):
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import telnetlib
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self.tn = telnetlib.Telnet(ip, timeout=15)
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self.read_timeout = read_timeout
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if b'Login as:' in self.tn.read_until(b'Login as:', timeout=read_timeout):
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self.tn.write(bytes(user, 'ascii') + b"\r\n")
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if b'Password:' in self.tn.read_until(b'Password:', timeout=read_timeout):
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# needed because of internal implementation details of the telnet server
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time.sleep(0.2)
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self.tn.write(bytes(password, 'ascii') + b"\r\n")
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if b'for more information.' in self.tn.read_until(b'Type "help()" for more information.', timeout=read_timeout):
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# login succesful
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from collections import deque
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self.fifo = deque()
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return
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raise PyboardError('Failed to establish a telnet connection with the board')
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def __del__(self):
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self.close()
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def close(self):
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try:
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self.tn.close()
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except:
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# the telnet object might not exist yet, so ignore this one
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pass
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def read(self, size=1):
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while len(self.fifo) < size:
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timeout_count = 0
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data = self.tn.read_eager()
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if len(data):
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self.fifo.extend(data)
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timeout_count = 0
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else:
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time.sleep(0.25)
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if self.read_timeout is not None and timeout_count > 4 * self.read_timeout:
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break
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timeout_count += 1
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data = b''
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while len(data) < size and len(self.fifo) > 0:
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data += bytes([self.fifo.popleft()])
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return data
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def write(self, data):
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self.tn.write(data)
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return len(data)
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def inWaiting(self):
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n_waiting = len(self.fifo)
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if not n_waiting:
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data = self.tn.read_eager()
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self.fifo.extend(data)
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return len(data)
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else:
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return n_waiting
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class Pyboard:
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def __init__(self, device, baudrate=115200, user='micro', password='python', wait=0):
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if device and device[0].isdigit() and device[-1].isdigit() and device.count('.') == 3:
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# device looks like an IP address
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self.serial = TelnetToSerial(device, user, password, read_timeout=10)
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else:
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import serial
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delayed = False
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for attempt in range(wait + 1):
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try:
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self.serial = serial.Serial(device, baudrate=baudrate, interCharTimeout=1)
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break
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except (OSError, IOError): # Py2 and Py3 have different errors
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if wait == 0:
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continue
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if attempt == 0:
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sys.stdout.write('Waiting {} seconds for pyboard '.format(wait))
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delayed = True
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time.sleep(1)
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sys.stdout.write('.')
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sys.stdout.flush()
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else:
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if delayed:
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print('')
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raise PyboardError('failed to access ' + device)
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if delayed:
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print('')
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def close(self):
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self.serial.close()
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def read_until(self, min_num_bytes, ending, timeout=10, data_consumer=None):
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data = self.serial.read(min_num_bytes)
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if data_consumer:
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data_consumer(data)
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timeout_count = 0
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while True:
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if data.endswith(ending):
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break
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elif self.serial.inWaiting() > 0:
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new_data = self.serial.read(1)
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data = data + new_data
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if data_consumer:
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data_consumer(new_data)
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timeout_count = 0
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else:
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timeout_count += 1
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if timeout is not None and timeout_count >= 100 * timeout:
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break
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time.sleep(0.01)
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return data
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def enter_raw_repl(self):
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self.serial.write(b'\r\x03\x03') # ctrl-C twice: interrupt any running program
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# flush input (without relying on serial.flushInput())
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n = self.serial.inWaiting()
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while n > 0:
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self.serial.read(n)
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n = self.serial.inWaiting()
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self.serial.write(b'\r\x01') # ctrl-A: enter raw REPL
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data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n>')
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if not data.endswith(b'raw REPL; CTRL-B to exit\r\n>'):
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print(data)
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raise PyboardError('could not enter raw repl')
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self.serial.write(b'\x04') # ctrl-D: soft reset
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data = self.read_until(1, b'soft reboot\r\n')
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if not data.endswith(b'soft reboot\r\n'):
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print(data)
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raise PyboardError('could not enter raw repl')
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# By splitting this into 2 reads, it allows boot.py to print stuff,
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# which will show up after the soft reboot and before the raw REPL.
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data = self.read_until(1, b'raw REPL; CTRL-B to exit\r\n')
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if not data.endswith(b'raw REPL; CTRL-B to exit\r\n'):
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print(data)
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raise PyboardError('could not enter raw repl')
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def exit_raw_repl(self):
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self.serial.write(b'\r\x02') # ctrl-B: enter friendly REPL
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def follow(self, timeout, data_consumer=None):
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# wait for normal output
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data = self.read_until(1, b'\x04', timeout=timeout, data_consumer=data_consumer)
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if not data.endswith(b'\x04'):
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raise PyboardError('timeout waiting for first EOF reception')
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data = data[:-1]
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# wait for error output
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data_err = self.read_until(1, b'\x04', timeout=timeout)
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if not data_err.endswith(b'\x04'):
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raise PyboardError('timeout waiting for second EOF reception')
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data_err = data_err[:-1]
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# return normal and error output
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return data, data_err
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def exec_raw_no_follow(self, command):
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if isinstance(command, bytes):
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command_bytes = command
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else:
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command_bytes = bytes(command, encoding='utf8')
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# check we have a prompt
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data = self.read_until(1, b'>')
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if not data.endswith(b'>'):
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raise PyboardError('could not enter raw repl')
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# write command
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for i in range(0, len(command_bytes), 256):
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self.serial.write(command_bytes[i:min(i + 256, len(command_bytes))])
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time.sleep(0.01)
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self.serial.write(b'\x04')
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# check if we could exec command
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data = self.serial.read(2)
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if data != b'OK':
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raise PyboardError('could not exec command')
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def exec_raw(self, command, timeout=10, data_consumer=None):
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self.exec_raw_no_follow(command);
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return self.follow(timeout, data_consumer)
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def eval(self, expression):
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ret = self.exec_('print({})'.format(expression))
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ret = ret.strip()
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return ret
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def exec_(self, command):
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ret, ret_err = self.exec_raw(command)
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if ret_err:
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raise PyboardError('exception', ret, ret_err)
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return ret
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def execfile(self, filename):
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with open(filename, 'rb') as f:
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pyfile = f.read()
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return self.exec_(pyfile)
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def get_time(self):
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t = str(self.eval('pyb.RTC().datetime()'), encoding='utf8')[1:-1].split(', ')
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return int(t[4]) * 3600 + int(t[5]) * 60 + int(t[6])
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# in Python2 exec is a keyword so one must use "exec_"
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# but for Python3 we want to provide the nicer version "exec"
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setattr(Pyboard, "exec", Pyboard.exec_)
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def execfile(filename, device='/dev/ttyACM0', baudrate=115200, user='micro', password='python'):
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pyb = Pyboard(device, baudrate, user, password)
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pyb.enter_raw_repl()
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output = pyb.execfile(filename)
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stdout_write_bytes(output)
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pyb.exit_raw_repl()
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pyb.close()
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def main():
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import argparse
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cmd_parser = argparse.ArgumentParser(description='Run scripts on the pyboard.')
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cmd_parser.add_argument('--device', default='/dev/ttyACM0', help='the serial device or the IP address of the pyboard')
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cmd_parser.add_argument('-b', '--baudrate', default=115200, help='the baud rate of the serial device')
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cmd_parser.add_argument('-u', '--user', default='micro', help='the telnet login username')
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cmd_parser.add_argument('-p', '--password', default='python', help='the telnet login password')
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cmd_parser.add_argument('-c', '--command', help='program passed in as string')
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cmd_parser.add_argument('-w', '--wait', default=0, type=int, help='seconds to wait for USB connected board to become available')
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cmd_parser.add_argument('--follow', action='store_true', help='follow the output after running the scripts [default if no scripts given]')
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cmd_parser.add_argument('files', nargs='*', help='input files')
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args = cmd_parser.parse_args()
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# open the connection to the pyboard
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try:
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pyb = Pyboard(args.device, args.baudrate, args.user, args.password, args.wait)
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except PyboardError as er:
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print(er)
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sys.exit(1)
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# run any command or file(s)
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if args.command is not None or len(args.files):
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# we must enter raw-REPL mode to execute commands
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# this will do a soft-reset of the board
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try:
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pyb.enter_raw_repl()
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except PyboardError as er:
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print(er)
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sys.exit(1)
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def execbuffer(buf):
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try:
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ret, ret_err = pyb.exec_raw(buf, timeout=None, data_consumer=stdout_write_bytes)
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except PyboardError as er:
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print(er)
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sys.exit(1)
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except KeyboardInterrupt:
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sys.exit(1)
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if ret_err:
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pyb.exit_raw_repl()
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pyb.close()
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stdout_write_bytes(ret_err)
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sys.exit(1)
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# run the command, if given
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if args.command is not None:
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execbuffer(args.command.encode('utf-8'))
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# run any files
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for filename in args.files:
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with open(filename, 'rb') as f:
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pyfile = f.read()
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execbuffer(pyfile)
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# exiting raw-REPL just drops to friendly-REPL mode
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pyb.exit_raw_repl()
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# if asked explicitly, or no files given, then follow the output
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if args.follow or (args.command is None and len(args.files) == 0):
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try:
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ret, ret_err = pyb.follow(timeout=None, data_consumer=stdout_write_bytes)
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except PyboardError as er:
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print(er)
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sys.exit(1)
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except KeyboardInterrupt:
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sys.exit(1)
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if ret_err:
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pyb.close()
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stdout_write_bytes(ret_err)
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sys.exit(1)
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# close the connection to the pyboard
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pyb.close()
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if __name__ == "__main__":
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main()
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