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Add support for DMAMUX-capable MCU configuration with WS2812 PWM driver. (#9471)

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Nick Brassel 2020-07-16 16:39:49 +10:00 committed by James Young
parent 8a4a0c25fd
commit c6b7a0d386
2 changed files with 10 additions and 1 deletions
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3
docs/ws2812_driver.md
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@ -92,6 +92,7 @@ Configure the hardware via your config.h:
#define WS2812_PWM_PAL_MODE 2 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 2
#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.
```
You must also turn on the PWM feature in your halconf.h and mcuconf.h
@ -117,5 +118,5 @@ Note: This only applies to STM32 boards.
To configure the `RGB_DI_PIN` to open drain configuration add this to your config.h file:
```c
#define WS2812_EXTERNAL_PULLUP
#define WS2812_EXTERNAL_PULLUP
```

8
drivers/chibios/ws2812_pwm.c
View file

@ -23,6 +23,9 @@
#ifndef WS2812_DMA_CHANNEL
# define WS2812_DMA_CHANNEL 2 // DMA Channel for TIMx_UP
#endif
#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_DMAMUX_ID)
# error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
#endif
// Push Pull or Open Drain Configuration
// Default Push Pull
@ -184,6 +187,11 @@ void ws2812_init(void) {
dmaStreamSetMode(WS2812_DMA_STREAM, STM32_DMA_CR_CHSEL(WS2812_DMA_CHANNEL) | STM32_DMA_CR_DIR_M2P | STM32_DMA_CR_PSIZE_WORD | STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_MINC | STM32_DMA_CR_CIRC | STM32_DMA_CR_PL(3));
// M2P: Memory 2 Periph; PL: Priority Level
#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE)
// If the MCU has a DMAMUX we need to assign the correct resource
dmaSetRequestSource(WS2812_DMA_STREAM, WS2812_DMAMUX_ID);
#endif
// Start DMA
dmaStreamEnable(WS2812_DMA_STREAM);