From e43de7e5a26662794d59ffe72ca0f68517aea14a Mon Sep 17 00:00:00 2001
From: cnlohr <lohr85@gmail.com>
Date: Wed, 2 Aug 2023 05:35:45 -0400
Subject: [PATCH] Add notes about the ws2812B
---
extralibs/ws2812b_dma_spi_led_driver.h | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/extralibs/ws2812b_dma_spi_led_driver.h b/extralibs/ws2812b_dma_spi_led_driver.h
index 9a422bd..433fff7 100644
--- a/extralibs/ws2812b_dma_spi_led_driver.h
+++ b/extralibs/ws2812b_dma_spi_led_driver.h
@@ -11,13 +11,13 @@
#define WS2812DMA_IMPLEMENTATION
You will need to implement the following two functions, as callbacks from the ISR.
- uint32_t CallbackWS2812BLED( int ledno );
+ uint32_t WS2812BLEDCallback( int ledno );
You willalso need to call
- InitWS2812DMA();
+ WS2812BDMAInit();
Then, whenyou want to update the LEDs, call:
- WS2812BStart( int num_leds );
+ WS2812BDMAStart( int num_leds );
*/
#ifndef _WS2812_LED_DRIVER_H
@@ -35,7 +35,9 @@ uint32_t WS2812BLEDCallback( int ledno );
#ifdef WS2812DMA_IMPLEMENTATION
// Must be divisble by 4.
+#ifndef DMALEDS
#define DMALEDS 16
+#endif
// Note first n LEDs of DMA Buffer are 0's as a "break"
// Need one extra LED at end to leave line high.
@@ -139,6 +141,10 @@ void DMA1_Channel3_IRQHandler( void )
// Clear all possible flags.
DMA1->INTFCR = DMA1_IT_GL3;
+ // Strange note: These are backwards. DMA1_IT_HT3 should be HALF and
+ // DMA1_IT_TC3 should be COMPLETE. But for some reason, doing this causes
+ // LED jitter. I am henseforth flipping the order.
+
if( intfr & DMA1_IT_HT3 )
{
// Halfwaay (Fill in first part)
--
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