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# Proof-of-concept of a REPL over BLE UART.
#
# Tested with the Adafruit Bluefruit app on Android.
# Set the EoL characters to \r\n.
import bluetooth
import io
import os
import micropython
import machine
from ble_uart_peripheral import BLEUART
_MP_STREAM_POLL = const(3)
_MP_STREAM_POLL_RD = const(0x0001)
# TODO: Remove this when STM32 gets machine.Timer.
if hasattr(machine, 'Timer'):
_timer = machine.Timer(-1)
else:
_timer = None
# Batch writes into 50ms intervals.
def schedule_in(handler, delay_ms):
def _wrap(_arg):
handler()
if _timer:
_timer.init(mode=machine.Timer.ONE_SHOT, period=delay_ms, callback=_wrap)
else:
micropython.schedule(_wrap, None)
# Simple buffering stream to support the dupterm requirements.
class BLEUARTStream(io.IOBase):
def __init__(self, uart):
self._uart = uart
self._tx_buf = bytearray()
self._uart.irq(self._on_rx)
def _on_rx(self):
# Needed for ESP32.
if hasattr(os, 'dupterm_notify'):
os.dupterm_notify(None)
def read(self, sz=None):
return self._uart.read(sz)
def readinto(self, buf):
avail = self._uart.read(len(buf))
if not avail:
return None
for i in range(len(avail)):
buf[i] = avail[i]
return len(avail)
def ioctl(self, op, arg):
if op == _MP_STREAM_POLL:
if self._uart.any():
return _MP_STREAM_POLL_RD
return 0
def _flush(self):
data = self._tx_buf[0:100]
self._tx_buf = self._tx_buf[100:]
self._uart.write(data)
if self._tx_buf:
schedule_in(self._flush, 50)
def write(self, buf):
empty = not self._tx_buf
self._tx_buf += buf
if empty:
schedule_in(self._flush, 50)
def start():
ble = bluetooth.BLE()
uart = BLEUART(ble, name='mpy-repl')
stream = BLEUARTStream(uart)
os.dupterm(stream)
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