120 lines
3 KiB
C
120 lines
3 KiB
C
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/*
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* Copyright 2025 Google LLC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT arduino_modulino_smartleds
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/led_strip.h>
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#include <zephyr/kernel.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/sys/byteorder.h>
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LOG_MODULE_REGISTER(modulino_smartleds, CONFIG_LED_STRIP_LOG_LEVEL);
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#define MODULINO_SMARTLEDS_NUM_LEDS 8
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/* This is a strip of LC8822 driven by the microcontroller on the Modulino
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* board, the start frame is sent automatically, the rest uses the LC8822
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* protocol:
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* - 4x "1" marker bits
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* - 5x brightness bits
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* - 3x bytes for B, G, R
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*/
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#define MODULINO_SMARTLEDS_MARKER (0xe0 << 24)
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#define MODULINO_SMARTLEDS_FULL_BRIGHTNESS (0x1f << 24)
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struct modulino_smartleds_config {
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struct i2c_dt_spec bus;
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};
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struct modulino_smartleds_data {
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uint32_t buf[MODULINO_SMARTLEDS_NUM_LEDS];
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};
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static int modulino_smartleds_update_rgb(const struct device *dev,
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struct led_rgb *pixels,
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size_t count)
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{
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const struct modulino_smartleds_config *cfg = dev->config;
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struct modulino_smartleds_data *data = dev->data;
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int ret;
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if (count > MODULINO_SMARTLEDS_NUM_LEDS) {
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return -EINVAL;
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}
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for (uint8_t i = 0; i < count; i++) {
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data->buf[i] = sys_cpu_to_be32(
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MODULINO_SMARTLEDS_MARKER |
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MODULINO_SMARTLEDS_FULL_BRIGHTNESS |
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(pixels[i].b << 16) |
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(pixels[i].g << 8) |
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pixels[i].r);
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}
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ret = i2c_write_dt(&cfg->bus, (uint8_t *)data->buf, sizeof(data->buf));
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if (ret < 0) {
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LOG_ERR("i2c write error: %d", ret);
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return ret;
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}
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return 0;
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}
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static size_t modulino_smartleds_length(const struct device *dev)
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{
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return MODULINO_SMARTLEDS_NUM_LEDS;
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}
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static int modulino_smartleds_init(const struct device *dev)
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{
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const struct modulino_smartleds_config *cfg = dev->config;
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struct modulino_smartleds_data *data = dev->data;
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int ret;
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if (!i2c_is_ready_dt(&cfg->bus)) {
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LOG_ERR("Bus device is not ready");
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return -ENODEV;
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}
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for (uint8_t i = 0; i < ARRAY_SIZE(data->buf); i++) {
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data->buf[i] = sys_cpu_to_be32(MODULINO_SMARTLEDS_MARKER);
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}
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/* Reset to all LEDs off */
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ret = i2c_write_dt(&cfg->bus, (uint8_t *)data->buf, sizeof(data->buf));
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if (ret < 0) {
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LOG_ERR("i2c write error: %d", ret);
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return ret;
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}
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return 0;
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}
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static DEVICE_API(led_strip, modulino_smartleds_api) = {
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.update_rgb = modulino_smartleds_update_rgb,
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.length = modulino_smartleds_length,
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};
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#define MODULINO_SMARTLEDS_INIT(inst) \
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static const struct modulino_smartleds_config \
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modulino_smartleds_cfg_##inst = { \
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.bus = I2C_DT_SPEC_INST_GET(inst), \
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}; \
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\
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static struct modulino_smartleds_data modulino_smartleds_data_##inst; \
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\
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DEVICE_DT_INST_DEFINE(inst, modulino_smartleds_init, NULL, \
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&modulino_smartleds_data_##inst, \
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&modulino_smartleds_cfg_##inst, \
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POST_KERNEL, CONFIG_LED_STRIP_INIT_PRIORITY, \
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&modulino_smartleds_api);
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DT_INST_FOREACH_STATUS_OKAY(MODULINO_SMARTLEDS_INIT)
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