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76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
import math
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from esphome import pins
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from esphome.components import output
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import esphome.config_validation as cv
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import esphome.codegen as cg
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from esphome.const import CONF_BIT_DEPTH, CONF_CHANNEL, CONF_FREQUENCY, \
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CONF_ID, CONF_PIN, ESP_PLATFORM_ESP32
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ESP_PLATFORMS = [ESP_PLATFORM_ESP32]
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def calc_max_frequency(bit_depth):
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return 80e6 / (2**bit_depth)
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def calc_min_frequency(bit_depth):
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# LEDC_DIV_NUM_HSTIMER is 15-bit unsigned integer
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# lower 8 bits represent fractional part
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max_div_num = ((1 << 16) - 1) / 256.0
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return 80e6 / (max_div_num * (2**bit_depth))
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def validate_frequency_bit_depth(obj):
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frequency = obj[CONF_FREQUENCY]
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if CONF_BIT_DEPTH not in obj:
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obj = obj.copy()
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for bit_depth in range(15, 0, -1):
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if calc_min_frequency(bit_depth) <= frequency <= calc_max_frequency(bit_depth):
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obj[CONF_BIT_DEPTH] = bit_depth
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break
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else:
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min_freq = min(calc_min_frequency(x) for x in range(1, 16))
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max_freq = max(calc_max_frequency(x) for x in range(1, 16))
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if frequency < min_freq:
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raise cv.Invalid("This frequency setting is not possible, please choose a higher "
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"frequency (at least {}Hz)".format(int(min_freq)))
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if frequency > max_freq:
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raise cv.Invalid("This frequency setting is not possible, please choose a lower "
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"frequency (at most {}Hz)".format(int(max_freq)))
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raise cv.Invalid("Invalid frequency!")
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bit_depth = obj[CONF_BIT_DEPTH]
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min_freq = calc_min_frequency(bit_depth)
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max_freq = calc_max_frequency(bit_depth)
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if frequency > max_freq:
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raise cv.Invalid('Maximum frequency for bit depth {} is {}Hz. Please decrease the '
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'bit_depth.'.format(bit_depth, int(math.floor(max_freq))))
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if frequency < calc_min_frequency(bit_depth):
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raise cv.Invalid('Minimum frequency for bit depth {} is {}Hz. Please increase the '
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'bit_depth.'.format(bit_depth, int(math.ceil(min_freq))))
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return obj
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ledc_ns = cg.esphome_ns.namespace('ledc')
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LEDCOutput = ledc_ns.class_('LEDCOutput', output.FloatOutput, cg.Component)
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CONFIG_SCHEMA = cv.All(output.FLOAT_OUTPUT_SCHEMA.extend({
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cv.Required(CONF_ID): cv.declare_id(LEDCOutput),
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cv.Required(CONF_PIN): pins.internal_gpio_output_pin_schema,
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cv.Optional(CONF_FREQUENCY, default='1kHz'): cv.frequency,
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cv.Optional(CONF_BIT_DEPTH): cv.int_range(min=1, max=15),
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cv.Optional(CONF_CHANNEL): cv.int_range(min=0, max=15),
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}).extend(cv.COMPONENT_SCHEMA), validate_frequency_bit_depth)
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def to_code(config):
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gpio = yield cg.gpio_pin_expression(config[CONF_PIN])
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var = cg.new_Pvariable(config[CONF_ID], gpio)
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yield cg.register_component(var, config)
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yield output.register_output(var, config)
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if CONF_CHANNEL in config:
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cg.add(var.set_channel(config[CONF_CHANNEL]))
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cg.add(var.set_frequency(config[CONF_FREQUENCY]))
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cg.add(var.set_bit_depth(config[CONF_BIT_DEPTH]))
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