X-Git-Url: https://vault307.fbx.one/gitweb/micorpython_ir.git/blobdiff_plain/36140aa568d4a538adafb03e575b26de8a0784ef..d8d6758c3370f4adc636aed7b935a492754f6062:/ir_tx/__init__.py diff --git a/ir_tx/__init__.py b/ir_tx/__init__.py index ef52e84..6fe7710 100644 --- a/ir_tx/__init__.py +++ b/ir_tx/__init__.py @@ -5,9 +5,10 @@ # Copyright (c) 2020 Peter Hinch from sys import platform -ESP32 = platform == 'esp32' or platform == 'esp32_LoBo' +ESP32 = platform == 'esp32' # Loboris not supported owing to RMT if ESP32: - from machine import Pin, Timer, PWM, freq + from machine import Pin, PWM + from esp32 import RMT else: from pyb import Pin, Timer # Pyboard does not support machine.PWM @@ -17,10 +18,12 @@ import micropython # micropython.alloc_emergency_exception_buf(100) -# ABC only +# ABC and Pyboard only: ESP32 ignores this value. +# Duty ratio in carrier off state: if driver is such that 3.3V turns the LED +# off, set _SPACE = 100 _SPACE = const(0) -# If the wiring is such that 3.3V turns the LED off, set _SPACE as follows -# On Pyboard 100, on ESP32 1023 +# On ESP32 gate hardware design is led_on = rmt and carrier + # Shared by NEC STOP = const(0) # End of data @@ -31,15 +34,11 @@ class IR: def __init__(self, pin, cfreq, asize, duty, verbose): if ESP32: - freq(240000000) - self._pwm = PWM(pin) # Produces 36/38/40KHz carrier + self._pwm = PWM(pin[0]) # Continuous 36/38/40KHz carrier self._pwm.deinit() - self._pwm.init(freq=cfreq, duty=_SPACE) # ESP32: 0 <= duty <= 1023 - self._duty = round((duty if not _SPACE else (100 - duty)) * 10.23) - self._tim = Timer(-1) # Controls carrier on/off times - self._off = self.esp_off # Turn IR LED off - self._onoff = self.esp_onoff # Set IR LED state and refresh timer + self._pwm.init(freq=cfreq, duty=round(duty * 10.23)) + self._rmt = RMT(0, pin=pin[1], clock_div=80) # 1μs resolution else: # Pyboard tim = Timer(2, freq=cfreq) # Timer 2/pin produces 36/38/40KHz carrier self._ch = tim.channel(1, Timer.PWM, pin=pin) @@ -47,67 +46,51 @@ class IR: # Pyboard: 0 <= pulse_width_percent <= 100 self._duty = duty if not _SPACE else (100 - duty) self._tim = Timer(5) # Timer 5 controls carrier on/off times - self._off = self.pb_off - self._onoff = self.pb_onoff - self._tcb = self.cb # Pre-allocate + self._tcb = self._cb # Pre-allocate + self._arr = array('H', 0 for _ in range(asize)) # on/off times (μs) + self._mva = memoryview(self._arr) + # Subclass interface self.verbose = verbose - self.arr = array('H', 0 for _ in range(asize)) # on/off times (μs) self.carrier = False # Notional carrier state while encoding biphase self.aptr = 0 # Index into array - # Before populating array, zero pointer, set notional carrier state (off). - def transmit(self, addr, data, toggle=0): # NEC: toggle is unused - self.aptr = 0 # Inital conditions for tx: index into array - self.carrier = False - self.tx(addr, data, toggle) - self.append(STOP) - self.aptr = 0 # Reset pointer - self.cb(self._tim) # Initiate physical transmission. - - # Turn IR LED off (pyboard and ESP32 variants) - def pb_off(self): - self._ch.pulse_width_percent(_SPACE) - - def esp_off(self): - self._pwm.duty(_SPACE) - - # Turn IR LED on or off and re-initialise timer (pyboard and ESP32 variants) - @micropython.native - def pb_onoff(self, p, v): - self._ch.pulse_width_percent(_SPACE if p & 1 else self._duty) - self._tim.init(prescaler=84, period=v, callback=self._tcb) - - @micropython.native - def esp_onoff(self, p, v): - self._pwm.duty(_SPACE if p & 1 else self._duty) - self._tim.init(mode=Timer.ONE_SHOT, freq=v, callback=self.cb) - - def cb(self, t): # T5 callback, generate a carrier mark or space + def _cb(self, t): # T5 callback, generate a carrier mark or space t.deinit() p = self.aptr - v = self.arr[p] + v = self._arr[p] if v == STOP: - self._off() # Turn off IR LED. + self._ch.pulse_width_percent(_SPACE) # Turn off IR LED. return - self._onoff(p, v) + self._ch.pulse_width_percent(_SPACE if p & 1 else self._duty) + self._tim.init(prescaler=84, period=v, callback=self._tcb) self.aptr += 1 - def append(self, *times): # Append one or more time peiods to .arr + # Public interface + # Before populating array, zero pointer, set notional carrier state (off). + def transmit(self, addr, data, toggle=0): # NEC: toggle is unused + self.aptr = 0 # Inital conditions for tx: index into array + self.carrier = False + self.tx(addr, data, toggle) # Subclass populates ._arr + self.trigger() # Initiate transmission + + # Subclass interface + def trigger(self): # Used by NEC to initiate a repeat frame + if ESP32: + self._rmt.write_pulses(tuple(self._mva[0 : self.aptr]), start = 1) + else: + self.append(STOP) + self.aptr = 0 # Reset pointer + self._cb(self._tim) # Initiate physical transmission. + + def append(self, *times): # Append one or more time peiods to ._arr for t in times: - if ESP32 and t: - t -= 350 # ESP32 sluggishness - t = round(1_000_000 / t) # Store in Hz - self.arr[self.aptr] = t + self._arr[self.aptr] = t self.aptr += 1 self.carrier = not self.carrier # Keep track of carrier state self.verbose and print('append', t, 'carrier', self.carrier) - def add(self, t): # Increase last time value + def add(self, t): # Increase last time value (for biphase) assert t > 0 self.verbose and print('add', t) # .carrier unaffected - if ESP32: - t -= 350 - self.arr[self.aptr - 1] = round((self.arr[self.aptr - 1] / 1_000_000 + t) / 1_000_000) - else: - self.arr[self.aptr - 1] += t + self._arr[self.aptr - 1] += t