whisplay renders list of channels, selects channel, and connects
This commit is contained in:
Gabby Pelton
@@ -0,0 +1,661 @@
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import spidev
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import time
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import os
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import threading
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import gpiod
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# Detect gpiod API version: v1 has LINE_REQ_DIR_OUT; v2 has LineSettings
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_GPIOD_V2 = hasattr(gpiod, 'LineSettings')
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if _GPIOD_V2:
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from gpiod.line import Direction, Value, Bias
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# ==================== Platform Detection ====================
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def _detect_platform():
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"""Detect hardware platform type"""
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try:
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with open("/proc/device-tree/model", "r") as f:
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model = f.read().strip('\0').strip()
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if "Raspberry" in model:
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return "rpi", model
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elif "Radxa" in model:
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return "radxa", model
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except Exception:
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pass
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# Also check compatible string (some SoCs use non-descriptive model names)
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try:
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with open("/proc/device-tree/compatible", "r") as f:
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compat = f.read()
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if "radxa" in compat.lower():
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# Extract first compatible string as readable model name
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parts = compat.split('\0')
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model = parts[0] if parts else "Unknown Radxa"
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return "radxa", model
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except Exception:
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pass
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return "unknown", "Unknown"
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PLATFORM, PLATFORM_MODEL = _detect_platform()
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# ==================== Pin Mappings ====================
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# Physical 40-pin header pin number -> (gpiochip number, line offset)
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# Raspberry Pi: BOARD pin -> BCM GPIO number
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_RPI_BOARD_TO_BCM = {
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3: 2, 5: 3, 7: 4, 8: 14,
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10: 15, 11: 17, 12: 18, 13: 27,
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15: 22, 16: 23, 18: 24, 19: 10,
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21: 9, 22: 25, 23: 11, 24: 8,
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26: 7, 27: 0, 28: 1, 29: 5,
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31: 6, 32: 12, 33: 13, 35: 19,
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36: 16, 37: 26, 38: 20, 40: 21,
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}
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def _build_rpi_pin_map():
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"""Build RPi BOARD-pin -> (gpiochip, line_offset) mapping.
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RPi 5 uses gpiochip4 (RP1), earlier models use gpiochip0."""
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chip_num = 4 if "Raspberry Pi 5" in PLATFORM_MODEL else 0
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return {pin: (chip_num, bcm) for pin, bcm in _RPI_BOARD_TO_BCM.items()}
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# Based on RK3566 Radxa ZERO 3W
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RADXA_ZERO3_PIN_MAP = {
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3: (1, 0), 5: (1, 1), 7: (3, 20), 8: (0, 25),
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10: (0, 24), 11: (3, 1), 12: (3, 3), 13: (3, 2),
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15: (3, 8), 16: (3, 9), 18: (3, 10), 19: (4, 19),
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21: (4, 21), 22: (3, 17), 23: (4, 18), 24: (4, 22),
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26: (4, 25), 27: (4, 10), 28: (4, 11), 29: (3, 11),
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31: (3, 12), 32: (3, 18), 33: (3, 19), 35: (3, 4),
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36: (3, 7), 37: (1, 4), 38: (3, 6), 40: (3, 5),
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}
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# Based on Allwinner A733 Radxa Cubie A7Z
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# gpiochip0 (2000000.pinctrl, 352 lines): PA=0-31, PB=32-63, ..., PJ=288-319, PK=320-351
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# gpiochip1 (7025000.pinctrl, 64 lines): PL=0-31, PM=32-63
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RADXA_CUBIE_A7Z_PIN_MAP = {
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3: (0, 311), 5: (0, 310), 7: (0, 32), 8: (0, 41),
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10: (0, 42), 11: (0, 33), 12: (0, 37), 13: (1, 6),
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15: (1, 7), 16: (0, 312), 18: (0, 313), 19: (0, 108),
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21: (0, 109), 22: (1, 5), 23: (0, 107), 24: (0, 106),
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26: (0, 110), 27: (0, 113), 28: (0, 112), 29: (0, 34),
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31: (0, 35), 32: (1, 37), 33: (1, 35), 35: (0, 38),
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36: (0, 36), 37: (1, 36), 38: (0, 40), 40: (0, 39),
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}
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def _detect_radxa_board():
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"""Detect specific Radxa board variant from device tree compatible string"""
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try:
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with open("/proc/device-tree/compatible", "r") as f:
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compat = f.read().lower()
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if "cubie-a7z" in compat:
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return "cubie-a7z"
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elif "cubie-a7a" in compat:
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return "cubie-a7a"
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elif "cubie-a7s" in compat:
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return "cubie-a7s"
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except Exception:
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pass
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# Default to zero3w for backward compatibility
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return "zero3w"
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# ==================== gpiod v1/v2 Compatibility ====================
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class _LineHandle:
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"""Unified thin wrapper that exposes set_value(int) / get_value()->int
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regardless of whether the underlying library is gpiod v1 or v2."""
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def __init__(self, v2_request=None, v2_offset=None, v1_line=None):
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self._v2_req = v2_request
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self._v2_off = v2_offset
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self._v1 = v1_line
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def set_value(self, val):
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if self._v2_req is not None:
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self._v2_req.set_value(
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self._v2_off, Value.ACTIVE if val else Value.INACTIVE
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)
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else:
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self._v1.set_value(val)
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def get_value(self):
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if self._v2_req is not None:
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return 1 if self._v2_req.get_value(self._v2_off) == Value.ACTIVE else 0
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return self._v1.get_value()
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def release(self):
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try:
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if self._v2_req is not None:
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self._v2_req.release()
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else:
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self._v1.release()
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except Exception:
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pass
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def _request_output(chip, line_offset, consumer='whisplay'):
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"""Request a single GPIO line as output (LOW initial)."""
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if _GPIOD_V2:
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settings = gpiod.LineSettings(
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direction=Direction.OUTPUT, output_value=Value.INACTIVE
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)
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req = chip.request_lines(consumer=consumer, config={line_offset: settings})
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return _LineHandle(v2_request=req, v2_offset=line_offset)
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else:
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line = chip.get_line(line_offset)
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line.request(consumer=consumer, type=gpiod.LINE_REQ_DIR_OUT, default_val=0)
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return _LineHandle(v1_line=line)
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def _request_input(chip, line_offset, consumer='whisplay-btn'):
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"""Request a single GPIO line as input with bias disabled."""
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if _GPIOD_V2:
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try:
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settings = gpiod.LineSettings(
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direction=Direction.INPUT, bias=Bias.DISABLED
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)
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except Exception:
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settings = gpiod.LineSettings(direction=Direction.INPUT)
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req = chip.request_lines(consumer=consumer, config={line_offset: settings})
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return _LineHandle(v2_request=req, v2_offset=line_offset)
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else:
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line = chip.get_line(line_offset)
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try:
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line.request(
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consumer=consumer,
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type=gpiod.LINE_REQ_DIR_IN,
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flags=gpiod.LINE_REQ_FLAG_BIAS_DISABLE
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)
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except Exception:
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line.request(consumer=consumer, type=gpiod.LINE_REQ_DIR_IN)
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return _LineHandle(v1_line=line)
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# ==================== Software PWM ====================
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class SoftPWM:
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"""Software PWM implementation for GPIO platforms without hardware PWM support"""
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def __init__(self, set_value_func, frequency=100, stop_value=0):
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self._set_value = set_value_func
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self.frequency = frequency
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self.stop_value = stop_value
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self.duty_cycle = 0.0
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self._running = False
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self._thread = None
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def start(self, duty_cycle=0):
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self.duty_cycle = float(duty_cycle)
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self._running = True
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self._thread = threading.Thread(target=self._pwm_loop, daemon=True)
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self._thread.start()
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def ChangeDutyCycle(self, duty_cycle):
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self.duty_cycle = max(0.0, min(100.0, float(duty_cycle)))
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def stop(self):
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self._running = False
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if self._thread:
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self._thread.join(timeout=1)
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try:
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self._set_value(self.stop_value)
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except Exception:
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pass
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def _pwm_loop(self):
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while self._running:
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period = 1.0 / self.frequency
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dc = self.duty_cycle
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if dc <= 0:
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self._set_value(0)
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time.sleep(period)
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elif dc >= 100:
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self._set_value(1)
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time.sleep(period)
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else:
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on_time = period * dc / 100.0
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off_time = period - on_time
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self._set_value(1)
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time.sleep(on_time)
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self._set_value(0)
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time.sleep(off_time)
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class WhisplayBoard:
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# LCD parameters
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LCD_WIDTH = 240
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LCD_HEIGHT = 280
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BUTTON_POLL_INTERVAL_SEC = 0.005
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CornerHeight = 20 # Rounded corner height in pixels
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# Physical pin definitions (BOARD mode - shared by both platforms)
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DC_PIN = 13
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RST_PIN = 7
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LED_PIN = 15
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# RGB LED pins
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RED_PIN = 22
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GREEN_PIN = 18
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BLUE_PIN = 16
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# Button pin
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BUTTON_PIN = 11
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def __init__(self):
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self.platform = PLATFORM
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self.backlight_pwm = None
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self._current_r = 0
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self._current_g = 0
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self._current_b = 0
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self.button_press_callback = None
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self.button_release_callback = None
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# Select pin map and SPI config based on platform
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if self.platform == "rpi":
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self._pin_map = _build_rpi_pin_map()
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self._spi_bus = 0
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self._spi_cs = 0
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self._spi_speed = 100_000_000
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elif self.platform == "radxa":
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self._radxa_board = _detect_radxa_board()
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if self._radxa_board == "cubie-a7z":
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self._pin_map = RADXA_CUBIE_A7Z_PIN_MAP
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self._spi_bus = 1 # SPI1, CS0 (Allwinner A733)
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self._spi_cs = 0
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self._spi_speed = 48_000_000
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else:
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self._pin_map = RADXA_ZERO3_PIN_MAP
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self._spi_bus = 3 # SPI3, CS0 (RK3566 Radxa Zero 3W)
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self._spi_cs = 0
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self._spi_speed = 48_000_000
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else:
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raise RuntimeError(
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f"Unsupported platform: {self.platform}\n"
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"Install python3-libgpiod: sudo apt install python3-libgpiod"
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)
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self._init_gpio()
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self._init_spi()
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self.previous_frame = None
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# Detect hardware version and set backlight mode
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self._detect_hardware_version()
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self._detect_wm8960()
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self.set_backlight(0)
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self._reset_lcd()
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self._init_display()
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self.fill_screen(0)
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# ==================== GPIO Initialization (gpiod, unified) ====================
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def _init_gpio(self):
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"""Initialize all GPIO lines via gpiod (works on both RPi and Radxa)."""
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self._gpio_chips = {}
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self._gpio_lines = {}
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pins_used = [self.DC_PIN, self.RST_PIN, self.LED_PIN,
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self.RED_PIN, self.GREEN_PIN, self.BLUE_PIN,
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self.BUTTON_PIN]
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for pin in pins_used:
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if pin not in self._pin_map:
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raise RuntimeError(f"Physical pin {pin} is not defined in pin map")
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chip_num, _ = self._pin_map[pin]
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if chip_num not in self._gpio_chips:
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self._gpio_chips[chip_num] = gpiod.Chip(f'/dev/gpiochip{chip_num}')
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# Request output pins
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output_pins = [self.DC_PIN, self.RST_PIN, self.LED_PIN,
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self.RED_PIN, self.GREEN_PIN, self.BLUE_PIN]
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for pin in output_pins:
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chip_num, line_offset = self._pin_map[pin]
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chip = self._gpio_chips[chip_num]
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self._gpio_lines[pin] = _request_output(chip, line_offset)
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# Enable backlight (LOW = on)
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self._gpio_lines[self.LED_PIN].set_value(0)
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# Initialize RGB LED (using software PWM)
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red_line = self._gpio_lines[self.RED_PIN]
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green_line = self._gpio_lines[self.GREEN_PIN]
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blue_line = self._gpio_lines[self.BLUE_PIN]
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self.red_pwm = SoftPWM(red_line.set_value, 100, stop_value=1)
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self.green_pwm = SoftPWM(green_line.set_value, 100, stop_value=1)
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self.blue_pwm = SoftPWM(blue_line.set_value, 100, stop_value=1)
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self.red_pwm.start(0)
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self.green_pwm.start(0)
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self.blue_pwm.start(0)
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# Initialize button (input, polled for state changes)
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# The WhisPlay HAT has an external pull-down resistor on the button line.
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# Button pressed = HIGH, released = LOW. No internal pull needed.
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chip_num, line_offset = self._pin_map[self.BUTTON_PIN]
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chip = self._gpio_chips[chip_num]
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self._gpio_lines[self.BUTTON_PIN] = _request_input(chip, line_offset)
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# Start button event listener thread (polling)
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self._btn_thread_running = True
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self._btn_thread = threading.Thread(target=self._button_monitor, daemon=True)
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self._btn_thread.start()
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def _init_spi(self):
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"""Initialize SPI bus."""
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self.spi = spidev.SpiDev()
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self.spi.open(self._spi_bus, self._spi_cs)
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self.spi.max_speed_hz = self._spi_speed
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self.spi.mode = 0b00
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def _button_monitor(self):
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"""Button state polling thread.
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HIGH (1) = pressed, LOW (0) = released.
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Poll interval is configurable; shorter values improve responsiveness.
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"""
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btn_line = self._gpio_lines[self.BUTTON_PIN]
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last_state = btn_line.get_value()
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poll_interval = self.BUTTON_POLL_INTERVAL_SEC
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while self._btn_thread_running:
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try:
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state = btn_line.get_value()
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if state != last_state:
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last_state = state
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if state == 1:
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if self.button_press_callback:
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self.button_press_callback()
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else:
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if self.button_release_callback:
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self.button_release_callback()
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except Exception:
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if self._btn_thread_running:
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pass
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time.sleep(poll_interval)
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# ==================== GPIO Helpers ====================
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def _gpio_output(self, pin, value):
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"""Set GPIO pin output value"""
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self._gpio_lines[pin].set_value(1 if value else 0)
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def _gpio_input(self, pin):
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"""Read GPIO pin input value"""
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return self._gpio_lines[pin].get_value()
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# ==================== Hardware Detection ====================
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def _detect_hardware_version(self):
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"""Detect hardware version and set backlight mode accordingly"""
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try:
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model = PLATFORM_MODEL
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if self.platform == "rpi":
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if "Zero" in model and "2" not in model:
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self.backlight_mode = False # Use simple on/off mode
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else:
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self.backlight_mode = True # Use PWM mode
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elif self.platform == "radxa":
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# Radxa uses software PWM mode
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self.backlight_mode = True
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else:
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self.backlight_mode = True
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print(
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f"Detected hardware: {model}, Backlight mode: {'PWM' if self.backlight_mode else 'Simple Switch'}")
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except Exception as e:
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print(f"Error detecting hardware version: {e}")
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self.backlight_mode = True
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def _detect_wm8960(self):
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"""Detect if a sound card containing wm8960 exists"""
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try:
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with open("/proc/asound/cards", "r") as f:
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lines = f.readlines()
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for line in lines:
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if "wm8960" in line.lower():
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print("wm8960 sound card detected.")
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return True
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except Exception as e:
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print(f"Error detecting wm8960 sound card: {e}")
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return False
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print("wm8960 sound card not detected. Please refer to the following page for installation instructions.")
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print("https://docs.pisugar.com/")
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return False
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# ========== Backlight Control ==========
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def set_backlight(self, brightness):
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if self.backlight_mode: # PWM mode
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if self.backlight_pwm is None:
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led_line = self._gpio_lines[self.LED_PIN]
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self.backlight_pwm = SoftPWM(led_line.set_value, 1000, stop_value=1)
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self.backlight_pwm.start(100)
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if 0 <= brightness <= 100:
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duty_cycle = 100 - brightness
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self.backlight_pwm.ChangeDutyCycle(duty_cycle)
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else: # Simple on/off mode
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if brightness == 0:
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self._gpio_output(self.LED_PIN, 1) # Turn off backlight
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else:
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self._gpio_output(self.LED_PIN, 0) # Turn on backlight
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def set_backlight_mode(self, mode):
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"""
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Set backlight mode
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:param mode: True for PWM brightness control, False for simple on/off
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"""
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if mode == self.backlight_mode:
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return # Mode unchanged, no action needed
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if mode: # Switch to PWM mode
|
||||
led_line = self._gpio_lines[self.LED_PIN]
|
||||
self.backlight_pwm = SoftPWM(led_line.set_value, 1000, stop_value=1)
|
||||
self.backlight_pwm.start(100)
|
||||
else: # Switch to simple on/off mode
|
||||
if self.backlight_pwm is not None:
|
||||
self.backlight_pwm.stop()
|
||||
self.backlight_pwm = None
|
||||
self._gpio_output(self.LED_PIN, 1) # Ensure backlight is on
|
||||
self.backlight_mode = mode
|
||||
|
||||
def _reset_lcd(self):
|
||||
self._gpio_output(self.RST_PIN, 1)
|
||||
time.sleep(0.1)
|
||||
self._gpio_output(self.RST_PIN, 0)
|
||||
time.sleep(0.1)
|
||||
self._gpio_output(self.RST_PIN, 1)
|
||||
time.sleep(0.12)
|
||||
|
||||
def _init_display(self):
|
||||
self._send_command(0x11)
|
||||
time.sleep(0.12)
|
||||
USE_HORIZONTAL = 1
|
||||
direction = {0: 0x00, 1: 0xC0, 2: 0x70,
|
||||
3: 0xA0}.get(USE_HORIZONTAL, 0x00)
|
||||
self._send_command(0x36, direction)
|
||||
self._send_command(0x3A, 0x05)
|
||||
self._send_command(0xB2, 0x0C, 0x0C, 0x00, 0x33, 0x33)
|
||||
self._send_command(0xB7, 0x35)
|
||||
self._send_command(0xBB, 0x32)
|
||||
self._send_command(0xC2, 0x01)
|
||||
self._send_command(0xC3, 0x15)
|
||||
self._send_command(0xC4, 0x20)
|
||||
self._send_command(0xC6, 0x0F)
|
||||
self._send_command(0xD0, 0xA4, 0xA1)
|
||||
self._send_command(
|
||||
0xE0,
|
||||
0xD0,
|
||||
0x08,
|
||||
0x0E,
|
||||
0x09,
|
||||
0x09,
|
||||
0x05,
|
||||
0x31,
|
||||
0x33,
|
||||
0x48,
|
||||
0x17,
|
||||
0x14,
|
||||
0x15,
|
||||
0x31,
|
||||
0x34,
|
||||
)
|
||||
self._send_command(
|
||||
0xE1,
|
||||
0xD0,
|
||||
0x08,
|
||||
0x0E,
|
||||
0x09,
|
||||
0x09,
|
||||
0x15,
|
||||
0x31,
|
||||
0x33,
|
||||
0x48,
|
||||
0x17,
|
||||
0x14,
|
||||
0x15,
|
||||
0x31,
|
||||
0x34,
|
||||
)
|
||||
self._send_command(0x21)
|
||||
self._send_command(0x29)
|
||||
|
||||
def _send_command(self, cmd, *args):
|
||||
self._gpio_output(self.DC_PIN, 0)
|
||||
self.spi.xfer2([cmd])
|
||||
if args:
|
||||
self._gpio_output(self.DC_PIN, 1)
|
||||
self._send_data(list(args))
|
||||
|
||||
def _send_data(self, data):
|
||||
self._gpio_output(self.DC_PIN, 1)
|
||||
try:
|
||||
self.spi.writebytes2(data)
|
||||
except AttributeError:
|
||||
max_chunk = 4096
|
||||
for i in range(0, len(data), max_chunk):
|
||||
self.spi.writebytes(data[i : i + max_chunk])
|
||||
|
||||
def _send_data_bytes(self, data: bytes | bytearray):
|
||||
"""Fast path for bytes/bytearray — avoids Python list overhead."""
|
||||
self._gpio_output(self.DC_PIN, 1)
|
||||
try:
|
||||
self.spi.writebytes2(data)
|
||||
except AttributeError:
|
||||
max_chunk = 4096
|
||||
for i in range(0, len(data), max_chunk):
|
||||
self.spi.writebytes(list(data[i : i + max_chunk]))
|
||||
|
||||
def set_window(self, x0, y0, x1, y1, use_horizontal=0):
|
||||
if use_horizontal in (0, 1):
|
||||
self._send_command(0x2A, x0 >> 8, x0 & 0xFF, x1 >> 8, x1 & 0xFF)
|
||||
self._send_command(
|
||||
0x2B, (y0 + 20) >> 8, (y0 + 20) & 0xFF, (y1 +
|
||||
20) >> 8, (y1 + 20) & 0xFF
|
||||
)
|
||||
elif use_horizontal in (2, 3):
|
||||
self._send_command(
|
||||
0x2A, (x0 + 20) >> 8, (x0 + 20) & 0xFF, (x1 +
|
||||
20) >> 8, (x1 + 20) & 0xFF
|
||||
)
|
||||
self._send_command(0x2B, y0 >> 8, y0 & 0xFF, y1 >> 8, y1 & 0xFF)
|
||||
self._send_command(0x2C)
|
||||
|
||||
def draw_pixel(self, x, y, color):
|
||||
if x >= self.LCD_WIDTH or y >= self.LCD_HEIGHT:
|
||||
return
|
||||
self.set_window(x, y, x, y)
|
||||
self._send_data([(color >> 8) & 0xFF, color & 0xFF])
|
||||
|
||||
def draw_line(self, x0, y0, x1, y1, color):
|
||||
dx = abs(x1 - x0)
|
||||
dy = abs(y1 - y0)
|
||||
sx = 1 if x0 < x1 else -1
|
||||
sy = 1 if y0 < y1 else -1
|
||||
err = dx - dy
|
||||
|
||||
while True:
|
||||
self.draw_pixel(x0, y0, color)
|
||||
if x0 == x1 and y0 == y1:
|
||||
break
|
||||
e2 = 2 * err
|
||||
if e2 > -dy:
|
||||
err -= dy
|
||||
x0 += sx
|
||||
if e2 < dx:
|
||||
err += dx
|
||||
y0 += sy
|
||||
|
||||
def fill_screen(self, color):
|
||||
self.set_window(0, 0, self.LCD_WIDTH - 1, self.LCD_HEIGHT - 1)
|
||||
high = (color >> 8) & 0xFF
|
||||
low = color & 0xFF
|
||||
buffer = bytes([high, low]) * (self.LCD_WIDTH * self.LCD_HEIGHT)
|
||||
self._send_data_bytes(buffer)
|
||||
|
||||
def draw_image(self, x, y, width, height, pixel_data):
|
||||
if (x + width > self.LCD_WIDTH) or (y + height > self.LCD_HEIGHT):
|
||||
raise ValueError("Image dimensions exceed screen bounds")
|
||||
self.set_window(x, y, x + width - 1, y + height - 1)
|
||||
if isinstance(pixel_data, (bytes, bytearray)):
|
||||
self._send_data_bytes(pixel_data)
|
||||
else:
|
||||
self._send_data(pixel_data)
|
||||
|
||||
# ========== RGB LED & Button ==========
|
||||
def set_rgb(self, r, g, b):
|
||||
self.red_pwm.ChangeDutyCycle(100 - (r / 255 * 100))
|
||||
self.green_pwm.ChangeDutyCycle(100 - (g / 255 * 100))
|
||||
self.blue_pwm.ChangeDutyCycle(100 - (b / 255 * 100))
|
||||
self._current_r = r
|
||||
self._current_g = g
|
||||
self._current_b = b
|
||||
|
||||
def set_rgb_fade(self, r_target, g_target, b_target, duration_ms=100):
|
||||
steps = 20 # Adjust steps to control fade smoothness
|
||||
delay_ms = duration_ms / steps
|
||||
|
||||
r_step = (r_target - self._current_r) / steps
|
||||
g_step = (g_target - self._current_g) / steps
|
||||
b_step = (b_target - self._current_b) / steps
|
||||
|
||||
for _ in range(steps + 1):
|
||||
r_interim = int(self._current_r + _ * r_step)
|
||||
g_interim = int(self._current_g + _ * g_step)
|
||||
b_interim = int(self._current_b + _ * b_step)
|
||||
self.set_rgb(
|
||||
max(0, min(255, r_interim)),
|
||||
max(0, min(255, g_interim)),
|
||||
max(0, min(255, b_interim)),
|
||||
)
|
||||
time.sleep(delay_ms / 1000.0)
|
||||
|
||||
def button_pressed(self):
|
||||
return self._gpio_input(self.BUTTON_PIN) == 1
|
||||
|
||||
def on_button_press(self, callback):
|
||||
self.button_press_callback = callback
|
||||
|
||||
def on_button_release(self, callback):
|
||||
self.button_release_callback = callback
|
||||
|
||||
# ========== Cleanup ==========
|
||||
def cleanup(self):
|
||||
# Stop backlight PWM
|
||||
if self.backlight_pwm is not None:
|
||||
self.backlight_pwm.stop()
|
||||
# Close SPI
|
||||
self.spi.close()
|
||||
# Stop RGB LED PWM
|
||||
self.red_pwm.stop()
|
||||
self.green_pwm.stop()
|
||||
self.blue_pwm.stop()
|
||||
|
||||
# Stop button listener thread
|
||||
self._btn_thread_running = False
|
||||
if hasattr(self, '_btn_thread') and self._btn_thread:
|
||||
self._btn_thread.join(timeout=2)
|
||||
# Release GPIO resources
|
||||
for line in self._gpio_lines.values():
|
||||
try:
|
||||
line.release()
|
||||
except Exception:
|
||||
pass
|
||||
for chip in self._gpio_chips.values():
|
||||
try:
|
||||
chip.close()
|
||||
except Exception:
|
||||
pass
|
||||
Reference in New Issue
Block a user