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Add support for complementary outputs to the WS2812 PWM driver #11988

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Mar 3, 2021
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Add support for complementary outputs to the WS2812 PWM driver #11988

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Add support for complementary outputs to the WS2812 PWM driver
sigprof Feb 23, 2021
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Document support for complementary outputs in the WS2812 PWM driver
sigprof Feb 23, 2021
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Document support for complementary outputs in the WS2812 PWM driver
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@sigprof
sigprof committed Feb 23, 2021
commit 01f7e92322e5fdb7b97e41c1aeef36a7124d8fb9
3 changes: 3 additions & 0 deletions docs/ws2812_driver.md
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Expand Up @@ -102,11 +102,14 @@ Configure the hardware via your config.h:
#define WS2812_PWM_DRIVER PWMD2 // default: PWMD2
#define WS2812_PWM_CHANNEL 2 // default: 2
#define WS2812_PWM_PAL_MODE 2 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 2
//#define WS2812_PWM_COMPLEMENTARY_OUTPUT // Define for a complementary timer output (TIMx_CHyN); omit for a normal timer output (TIMx_CHy).
#define WS2812_DMA_STREAM STM32_DMA1_STREAM2 // DMA Stream for TIMx_UP, see the respective reference manual for the appropriate values for your MCU.
#define WS2812_DMA_CHANNEL 2 // DMA Channel for TIMx_UP, see the respective reference manual for the appropriate values for your MCU.
#define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM2_UP // DMAMUX configuration for TIMx_UP -- only required if your MCU has a DMAMUX peripheral, see the respective reference manual for the appropriate values for your MCU.
```
Note that using a complementary timer output (TIMx_CHyN) is possible only for advanced-control timers (TIM1, TIM8, TIM20 on STM32), and the `STM32_PWM_USE_ADVANCED` option in mcuconf.h must be set to `TRUE`. Complementary outputs of general-purpose timers are not supported due to ChibiOS limitations.
You must also turn on the PWM feature in your halconf.h and mcuconf.h
#### Testing Notes
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