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>
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/**
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* @brief Number of bit-periods to hold the data line low at the end of a frame
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*
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* The reset period for each frame must be at least 50 uS; so we add in 50 bit-times
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* of zeroes at the end. (50 bits)*(1.25 uS/bit) = 62.5 uS, which gives us some
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* slack in the timing requirements
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* The reset period for each frame is defined in WS2812_TRST_US.
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* Calculate the number of zeroes to add at the end assuming 1.25 uS/bit:
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*/
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#define WS2812_RESET_BIT_N (50)
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#define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / 1250)
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#define WS2812_COLOR_BIT_N (RGBLED_NUM * 24) /**< Number of data bits */
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#define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */
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