JS: Flipboard

js/flipboard/modules/js_rgbleds/led_driver_i.h

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+#pragma once
+
+#include <stm32wbxx_ll_dma.h>
+#include "led_driver.h"
+
+#define MAX_LED_COUNT 16
+
+// We store the HIGH/LOW durations (2 values) for each color bit (24 bits per LED)
+#define LED_DRIVER_BUFFER_SIZE (MAX_LED_COUNT * 2 * 24)
+
+// We use a setinel value to figure out when the timer is complete.
+#define LED_DRIVER_TIMER_SETINEL 0xFFFFU
+
+/** 64 transitions per us @ 64MHz.  Our timing is in NANO_SECONDS */
+#define LED_DRIVER_TIMER_NANOSECOND (1000U / (SystemCoreClock / 1000000U))
+
+// Timings for WS2812B
+#define LED_DRIVER_T0H 400U
+#define LED_DRIVER_T1H 800U
+#define LED_DRIVER_T0L 850U
+#define LED_DRIVER_T1L 450U
+#define LED_DRIVER_TRESETL 55 * 1000U
+#define LED_DRIVER_TDONE 2000U
+
+// Max wait for the DMA to complete. NOTE: 4000 leds*(850ns+450ns)*24 = 124.8ms + 50ms blanking = 174.8ms
+#define LED_DRIVER_SETINEL_WAIT_MS 200