STM32 WS2812 Open Drain Configuration (#9414)

* update docs stm32 only and applies  to all 3 driver
* cformat

1 files changed, 17 insertions, 5 deletions

diff --git a/drivers/chibios/ws2812_spi.c b/drivers/chibios/ws2812_spi.c
index 36e08e39e..3bbada7fe 100644
--- a/drivers/chibios/ws2812_spi.c
+++ b/drivers/chibios/ws2812_spi.c
@@ -16,6 +16,22 @@
 #    define WS2812_SPI_MOSI_PAL_MODE 5
 #endif
 
+// Push Pull or Open Drain Configuration
+// Default Push Pull
+#ifndef WS2812_EXTERNAL_PULLUP
+#    if defined(USE_GPIOV1)
+#        define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+#    else
+#        define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
+#    endif
+#else
+#    if defined(USE_GPIOV1)
+#        define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+#    else
+#        define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN
+#    endif
+#endif
+
 #define BYTES_FOR_LED_BYTE 4
 #define NB_COLORS 3
 #define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS)
@@ -52,11 +68,7 @@ static void set_led_color_rgb(LED_TYPE color, int pos) {
 }
 
 void ws2812_init(void) {
-#if defined(USE_GPIOV1)
-    palSetLineMode(RGB_DI_PIN, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
-#else
-    palSetLineMode(RGB_DI_PIN, PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL);
-#endif
+    palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
 
     // TODO: more dynamic baudrate
     static const SPIConfig spicfg = {