diff options
| author | Nick Brassel <nick@tzarc.org> | 2020-07-16 16:39:49 +1000 |
|---|---|---|
| committer | James Young <18669334+noroadsleft@users.noreply.github.com> | 2020-08-29 14:30:02 -0700 |
| commit | c6b7a0d386c347f20117943831a0215659d37c47 (patch) | |
| tree | 0b53a602c61b58842dba0f9dc3080371bfe1c027 | |
| parent | 8a4a0c25fdb2c4d0ac3ac8fd5f6ba14b56f4cd28 (diff) | |
Add support for DMAMUX-capable MCU configuration with WS2812 PWM driver. (#9471)
| -rw-r--r-- | docs/ws2812_driver.md | 3 | ||||
| -rw-r--r-- | drivers/chibios/ws2812_pwm.c | 8 |
2 files changed, 10 insertions, 1 deletions
diff --git a/docs/ws2812_driver.md b/docs/ws2812_driver.md index 941e1bde08..c1b96329e9 100644 --- a/docs/ws2812_driver.md +++ b/docs/ws2812_driver.md @@ -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 ``` diff --git a/drivers/chibios/ws2812_pwm.c b/drivers/chibios/ws2812_pwm.c index 7113db11e0..d93fa24735 100644 --- a/drivers/chibios/ws2812_pwm.c +++ b/drivers/chibios/ws2812_pwm.c @@ -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); |