From 7630a80791f0518e33145df52242f95184d16023 Mon Sep 17 00:00:00 2001 From: David Hoelscher Date: Mon, 28 Oct 2024 01:29:43 -0500 Subject: Change default ARM hardware PWM WS2812 tick frequency to 800kHz (#24508) --- platforms/chibios/drivers/ws2812_pwm.c | 37 ++++++++-------------------------- 1 file changed, 8 insertions(+), 29 deletions(-) (limited to 'platforms') diff --git a/platforms/chibios/drivers/ws2812_pwm.c b/platforms/chibios/drivers/ws2812_pwm.c index dc0e309163..c46e9171ab 100644 --- a/platforms/chibios/drivers/ws2812_pwm.c +++ b/platforms/chibios/drivers/ws2812_pwm.c @@ -79,15 +79,15 @@ # endif #endif -#ifndef WS2812_PWM_TARGET_PERIOD -//# define WS2812_PWM_TARGET_PERIOD 800000 // Original code is 800k...? -# define WS2812_PWM_TARGET_PERIOD 80000 // TODO: work out why 10x less on f303/f4x1 +// Default is 800000Hz, which has a period of 1.25us +#ifndef WS2812_PWM_FREQUENCY +# define WS2812_PWM_FREQUENCY (1000000000 / WS2812_TIMING) #endif /* --- PRIVATE CONSTANTS ---------------------------------------------------- */ -#define WS2812_PWM_FREQUENCY (CPU_CLOCK / 2) /**< Clock frequency of PWM, must be valid with respect to system clock! */ -#define WS2812_PWM_PERIOD (WS2812_PWM_FREQUENCY / WS2812_PWM_TARGET_PERIOD) /**< Clock period in ticks. 1 / 800kHz = 1.25 uS (as per datasheet) */ +#define WS2812_PWM_TICK_FREQUENCY (CPU_CLOCK / 2) /**< Clock frequency of PWM ticks, must be valid with respect to system clock! */ +#define WS2812_PWM_PERIOD (WS2812_PWM_TICK_FREQUENCY / WS2812_PWM_FREQUENCY) /**< Clock period in PWM ticks. */ /** * @brief Number of bit-periods to hold the data line low at the end of a frame @@ -102,37 +102,16 @@ /** * @brief High period for a zero, in ticks - * - * Per the datasheet: - * WS2812: - * - T0H: 200 nS to 500 nS, inclusive - * - T0L: 650 nS to 950 nS, inclusive - * WS2812B: - * - T0H: 200 nS to 500 nS, inclusive - * - T0L: 750 nS to 1050 nS, inclusive - * - * The duty cycle is calculated for a high period of 350 nS. */ -#define WS2812_DUTYCYCLE_0 (WS2812_PWM_FREQUENCY / (1000000000 / 350)) +#define WS2812_DUTYCYCLE_0 (WS2812_PWM_TICK_FREQUENCY / (1000000000 / WS2812_T0H)) #if (WS2812_DUTYCYCLE_0 > 255) # error WS2812 PWM driver: High period for a 0 is more than a byte #endif /** * @brief High period for a one, in ticks - * - * Per the datasheet: - * WS2812: - * - T1H: 550 nS to 850 nS, inclusive - * - T1L: 450 nS to 750 nS, inclusive - * WS2812B: - * - T1H: 750 nS to 1050 nS, inclusive - * - T1L: 200 nS to 500 nS, inclusive - * - * The duty cycle is calculated for a high period of 800 nS. - * This is in the middle of the specifications of the WS2812 and WS2812B. */ -#define WS2812_DUTYCYCLE_1 (WS2812_PWM_FREQUENCY / (1000000000 / 800)) +#define WS2812_DUTYCYCLE_1 (WS2812_PWM_TICK_FREQUENCY / (1000000000 / WS2812_T1H)) #if (WS2812_DUTYCYCLE_1 > 255) # error WS2812 PWM driver: High period for a 1 is more than a byte #endif @@ -322,7 +301,7 @@ void ws2812_init(void) { // PWM Configuration //#pragma GCC diagnostic ignored "-Woverride-init" // Turn off override-init warning for this struct. We use the overriding ability to set a "default" channel config static const PWMConfig ws2812_pwm_config = { - .frequency = WS2812_PWM_FREQUENCY, + .frequency = WS2812_PWM_TICK_FREQUENCY, .period = WS2812_PWM_PERIOD, // Mit dieser Periode wird UDE-Event erzeugt und ein neuer Wert (Länge WS2812_BIT_N) vom DMA ins CCR geschrieben .callback = NULL, .channels = -- cgit v1.2.3