class irrecv:
'''irrecv receive IR signal on pin into circular buffer'''
def __init__(self, pno=4, bsz=1024, dbgport=None):
self.BUFSZ = int(pow(2, math.ceil(math.log(bsz) / math.log(2))))
self.MASK = self.BUFSZ - 1
self.pin = pno
self.ir = Pin(pno, Pin.IN)
self.buf = array.array('i', 0 for i in range(self.BUFSZ))
self.ledge = 0
self.wptr = 0
self.rptr = 0
self.dbgport = dbgport
if dbgport is None:
self.dbgport = DummyPort()
self.dbgport.low()
# cache ticks functions for native call
self.ticks_diff = time.ticks_diff
self.ticks_us = time.ticks_us
self.start()
def __repr__(self):
return "<irrecv: {}, wptr={} rptr={}>".format(self.pin, self.wptr,
self.rptr)
@micropython.native
def timeseq_isr(self, p):
'''compute edge to edge transition time, ignore polarity'''
e = self.ticks_us()
self.dbgport.high()
s = 2 * p.value() - 1
d = self.ticks_diff(e, self.ledge)
self.ledge = e
self.buf[self.wptr] = d * s
self.wptr = (self.wptr + 1) & self.MASK
self.dbgport.low()
def stop(self):
'''disable isr'''
self.ir.deinit()
def start(self):
self.ir.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING,
handler=self.timeseq_isr)
def reset(self):
state = disable_irq()
self.wptr = 0
self.rptr = 0
enable_irq(state)
def read(self):
w = self.wptr
r = self.rptr
n = w - r
if n >= 0:
x = self.buf[r:w]
elif n < 0:
x = self.buf[r:] + self.buf[:w]
self.rptr = w
return x
class Ir:
portMethod = unit.PORT0 | unit.PORT1
def __init__(self, port):
self.tx = PWM(port[0], freq=38000, duty=0, timer=1)
self.rx = Pin(port[1], Pin.IN)
self.rx.init(Pin.IN)
self.rx.irq(handler=self._irq_cb, trigger=Pin.IRQ_FALLING)
self.rx_value = 0
self.times = 0
self.status = 0
self.tx_en = 0
self.duty = 0
self.time_num = peripheral.get_timer()
if self.time_num == None:
raise unit.Unit('ir application time fail')
self.timer = Timer(self.time_num)
self.timer.init(period=50, mode=self.timer.PERIODIC, callback=self._update)
def _irq_cb(self, pin):
self.times = 0
def _update(self, arg):
if self.tx_en:
self.duty = 0 if self.duty else 10
else:
self.duty = 0
self.tx.duty(self.duty)
self.times += 1
def rxStatus(self):
return 1 if self.times < 5 else 0
def txOn(self):
self.tx_en = 1
def txOff(self):
self.tx_en = 0
def deinit(self):
self.timer.deinit()
if self.time_num is not None:
peripheral.free_timer(self.time_num)
self.rx.deinit()