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| author | Joshua Diamond <josh@windowoffire.com> | 2020-06-19 22:59:28 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-06-20 12:59:28 +1000 |
| commit | 18e561b82cdb71bed0162b3ce4083a2d269e5336 (patch) | |
| tree | 6e016ac5a1e8cbca871b04646e477307dc366280 /drivers/chibios/ws2812_pwm.c | |
| parent | c7851484457e5ab604962ae7c914b863b8de0cb2 (diff) | |
| download | firmware-18e561b82cdb71bed0162b3ce4083a2d269e5336.tar.gz firmware-18e561b82cdb71bed0162b3ce4083a2d269e5336.tar.bz2 firmware-18e561b82cdb71bed0162b3ce4083a2d269e5336.zip | |
Fix incorrect delay when setting WS2812 (and similar) leds (#9302)
* 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 <sigprof@gmail.com>
* Remove unneeded cast to uint8_t and correct math
Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
* microseconds -> µs
Co-authored-by: Ryan <fauxpark@gmail.com>
* Make documentation better match the spec sheet.
Co-authored-by: Ryan <fauxpark@gmail.com>
* Rename macro to match spec sheet
* Further correction to the delay maths for the SPI case.
Co-authored-by: Joel Challis <git@zvecr.com>
* 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 <sigprof@gmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Diffstat (limited to 'drivers/chibios/ws2812_pwm.c')
| -rw-r--r-- | drivers/chibios/ws2812_pwm.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/chibios/ws2812_pwm.c b/drivers/chibios/ws2812_pwm.c index ba45d0042..7113db11e 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 */ |