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add FastLED YAML option for data rate (#1338)

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* fix: FastLED SPI_DATA_RATE being truncated to 8 bits

FastLED expects SPI_DATA_RATE as an uint32_t, but we had it as uint8_t.
Fix that to avoid the data rate being truncated.

* fastled: allow specifying data rate

Previously, we've just taken the default data rate from FastLED.
However, that does not always work properly. In my case, I had a
slow level shifter that couldn't keep up with the 1 MHz data
rate default for WS2801. Long cabling might also be a reason why
one might want to reduce the data rate.

This will add a new optional "data_rate" config option where one
may specify the desired data rate as a frequency:

  light:
    - platform: fastled_spi
      chipset: WS2801
      data_pin: GPIO23
      clock_pin: GPIO22
      data_rate: 500kHz
      num_leds: 178
This commit is contained in:
Nico B
2020-11-01 19:45:21 +01:00
committed by GitHub
parent 20dd744680
commit 3fcdaaefe0
4 changed files with 18 additions and 6 deletions
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20
esphome/components/fastled_spi/light.py
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@@ -2,7 +2,8 @@ import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import pins
from esphome.components import fastled_base
from esphome.const import CONF_CHIPSET, CONF_CLOCK_PIN, CONF_DATA_PIN, CONF_NUM_LEDS, CONF_RGB_ORDER
from esphome.const import CONF_CHIPSET, CONF_CLOCK_PIN, CONF_DATA_PIN, CONF_DATA_RATE, \
CONF_NUM_LEDS, CONF_RGB_ORDER
AUTO_LOAD = ['fastled_base']
@@ -21,15 +22,24 @@ CONFIG_SCHEMA = fastled_base.BASE_SCHEMA.extend({
cv.Required(CONF_CHIPSET): cv.one_of(*CHIPSETS, upper=True),
cv.Required(CONF_DATA_PIN): pins.output_pin,
cv.Required(CONF_CLOCK_PIN): pins.output_pin,
cv.Optional(CONF_DATA_RATE): cv.frequency,
})
def to_code(config):
var = yield fastled_base.new_fastled_light(config)
rgb_order = None
if CONF_RGB_ORDER in config:
rgb_order = cg.RawExpression(config[CONF_RGB_ORDER])
rgb_order = cg.RawExpression(config[CONF_RGB_ORDER] if CONF_RGB_ORDER in config else "RGB")
data_rate = None
if CONF_DATA_RATE in config:
data_rate_khz = int(config[CONF_DATA_RATE] / 1000)
if data_rate_khz < 1000:
data_rate = cg.RawExpression(f"DATA_RATE_KHZ({data_rate_khz})")
else:
data_rate_mhz = int(data_rate_khz / 1000)
data_rate = cg.RawExpression(f"DATA_RATE_MHZ({data_rate_mhz})")
template_args = cg.TemplateArguments(cg.RawExpression(config[CONF_CHIPSET]),
config[CONF_DATA_PIN], config[CONF_CLOCK_PIN], rgb_order)
config[CONF_DATA_PIN], config[CONF_CLOCK_PIN], rgb_order,
data_rate)
cg.add(var.add_leds(template_args, config[CONF_NUM_LEDS]))