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-rw-r--r--docs/ws2812_driver.md3
-rw-r--r--drivers/chibios/ws2812_pwm.c11
2 files changed, 13 insertions, 1 deletions
diff --git a/docs/ws2812_driver.md b/docs/ws2812_driver.md
index cca6827ec8..fa14f02fdb 100644
--- a/docs/ws2812_driver.md
+++ b/docs/ws2812_driver.md
@@ -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
diff --git a/drivers/chibios/ws2812_pwm.c b/drivers/chibios/ws2812_pwm.c
index 140120d488..e6af55b6b3 100644
--- a/drivers/chibios/ws2812_pwm.c
+++ b/drivers/chibios/ws2812_pwm.c
@@ -27,6 +27,15 @@
# error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
#endif
+#ifndef WS2812_PWM_COMPLEMENTARY_OUTPUT
+# define WS2812_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
+#else
+# if !STM32_PWM_USE_ADVANCED
+# error "WS2812_PWM_COMPLEMENTARY_OUTPUT requires STM32_PWM_USE_ADVANCED == TRUE"
+# endif
+# define WS2812_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
+#endif
+
// Push Pull or Open Drain Configuration
// Default Push Pull
#ifndef WS2812_EXTERNAL_PULLUP
@@ -247,7 +256,7 @@ void ws2812_init(void) {
.channels =
{
[0 ... 3] = {.mode = PWM_OUTPUT_DISABLED, .callback = NULL}, // Channels default to disabled
- [WS2812_PWM_CHANNEL - 1] = {.mode = PWM_OUTPUT_ACTIVE_HIGH, .callback = NULL}, // Turn on the channel we care about
+ [WS2812_PWM_CHANNEL - 1] = {.mode = WS2812_PWM_OUTPUT_MODE, .callback = NULL}, // Turn on the channel we care about
},
.cr2 = 0,
.dier = TIM_DIER_UDE, // DMA on update event for next period