From 18e561b82cdb71bed0162b3ce4083a2d269e5336 Mon Sep 17 00:00:00 2001 From: Joshua Diamond Date: Fri, 19 Jun 2020 22:59:28 -0400 Subject: Fix incorrect delay when setting WS2812 (and similar) leds (#9302) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * Fix incorrect delay when setting WS2812 (and similar) leds * Add documentation for WS2812_DELAY_MICROSECONDS * Remove improper cast to uint8_t Co-authored-by: Sergey Vlasov * Remove unneeded cast to uint8_t and correct math Co-authored-by: Sergey Vlasov * microseconds -> µs Co-authored-by: Ryan * Make documentation better match the spec sheet. Co-authored-by: Ryan * Rename macro to match spec sheet * Further correction to the delay maths for the SPI case. Co-authored-by: Joel Challis * Move ws2812_common.h to the drivers directory * Revert "Further correction to the delay maths for the SPI case." This reverts commit e61b56a2cfc7dfec9992a7a3af92afa50e5b8ec0. * Remove ws2812_setleds_pin(); consolidate ws2812.h Co-authored-by: Sergey Vlasov Co-authored-by: Ryan Co-authored-by: Joel Challis --- drivers/chibios/ws2812.c | 2 +- drivers/chibios/ws2812.h | 16 ---------------- drivers/chibios/ws2812_pwm.c | 7 +++---- drivers/chibios/ws2812_spi.c | 2 +- 4 files changed, 5 insertions(+), 22 deletions(-) delete mode 100644 drivers/chibios/ws2812.h (limited to 'drivers/chibios') diff --git a/drivers/chibios/ws2812.c b/drivers/chibios/ws2812.c index 2c2d9fb2dc..5917b7f0ec 100644 --- a/drivers/chibios/ws2812.c +++ b/drivers/chibios/ws2812.c @@ -51,7 +51,7 @@ // The reset gap can be 6000 ns, but depending on the LED strip it may have to be increased // to values like 600000 ns. If it is too small, the pixels will show nothing most of the time. -#define RES 10000 // Width of the low gap between bits to cause a frame to latch +#define RES (1000 * WS2812_TRST_US) // Width of the low gap between bits to cause a frame to latch void sendByte(uint8_t byte) { // WS2812 protocol wants most significant bits first diff --git a/drivers/chibios/ws2812.h b/drivers/chibios/ws2812.h deleted file mode 100644 index 41c22a00b8..0000000000 --- a/drivers/chibios/ws2812.h +++ /dev/null @@ -1,16 +0,0 @@ -#pragma once - -#include "quantum/color.h" - -/* User Interface - * - * Input: - * ledarray: An array of GRB data describing the LED colors - * number_of_leds: The number of LEDs to write - * - * The functions will perform the following actions: - * - Set the data-out pin as output - * - Send out the LED data - * - Wait 50us to reset the LEDs - */ -void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds); diff --git a/drivers/chibios/ws2812_pwm.c b/drivers/chibios/ws2812_pwm.c index ba45d00425..7113db11e0 100644 --- a/drivers/chibios/ws2812_pwm.c +++ b/drivers/chibios/ws2812_pwm.c @@ -53,11 +53,10 @@ /** * @brief Number of bit-periods to hold the data line low at the end of a frame * - * The reset period for each frame must be at least 50 uS; so we add in 50 bit-times - * of zeroes at the end. (50 bits)*(1.25 uS/bit) = 62.5 uS, which gives us some - * slack in the timing requirements + * The reset period for each frame is defined in WS2812_TRST_US. + * Calculate the number of zeroes to add at the end assuming 1.25 uS/bit: */ -#define WS2812_RESET_BIT_N (50) +#define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / 1250) #define WS2812_COLOR_BIT_N (RGBLED_NUM * 24) /**< Number of data bits */ #define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */ diff --git a/drivers/chibios/ws2812_spi.c b/drivers/chibios/ws2812_spi.c index 3bbada7fef..7a1d2f05da 100644 --- a/drivers/chibios/ws2812_spi.c +++ b/drivers/chibios/ws2812_spi.c @@ -36,7 +36,7 @@ #define NB_COLORS 3 #define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS) #define DATA_SIZE (BYTES_FOR_LED * RGBLED_NUM) -#define RESET_SIZE 200 +#define RESET_SIZE (1000 * WS2812_TRST_US / (2 * 1250)) #define PREAMBLE_SIZE 4 static uint8_t txbuf[PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE] = {0}; -- cgit v1.2.3