From db629d87c87b905ce3e60457eebf4e6552943260 Mon Sep 17 00:00:00 2001
From: mrfaptastic <12006953+mrfaptastic@users.noreply.github.com>
Date: Wed, 29 Jul 2020 22:33:18 +0100
Subject: Minor fixes

---
 ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp | 8 +++-----
 ESP32-RGB64x32MatrixPanel-I2S-DMA.h   | 6 ++++++
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp b/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
index 4666967..286cab1 100644
--- a/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
+++ b/ESP32-RGB64x32MatrixPanel-I2S-DMA.cpp
@@ -269,6 +269,8 @@ bool RGB64x32MatrixPanel_I2S_DMA::allocateDMAmemory()
         delay(1000);
     #endif
 
+    // Just os we know
+  	everything_OK = true;
 
     return true;
 
@@ -389,16 +391,12 @@ void RGB64x32MatrixPanel_I2S_DMA::configureDMA(int r1_pin, int  g1_pin, int  b1_
 
         delay(1000);
     #endif       
-	
-	// Just os we know
-	everything_OK = true;
-	
+		
 } // end initMatrixDMABuff
 
 
 
 
-
 /* Update a specific co-ordinate in the DMA buffer */
 void RGB64x32MatrixPanel_I2S_DMA::updateMatrixDMABuffer(int16_t x_coord, int16_t y_coord, uint8_t red, uint8_t green, uint8_t blue)
 {
diff --git a/ESP32-RGB64x32MatrixPanel-I2S-DMA.h b/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
index 28ffbda..539a312 100644
--- a/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
+++ b/ESP32-RGB64x32MatrixPanel-I2S-DMA.h
@@ -249,6 +249,9 @@ class RGB64x32MatrixPanel_I2S_DMA : public GFX {
         #if SERIAL_DEBUG     
                 Serial.printf("Set back buffer to: %d\n", back_buffer_id);
         #endif      
+
+        // Wait before we allow any writing to the buffer. Stop flicker.
+        while(!i2s_parallel_is_previous_buffer_free()) {}       
     }
     
     inline void showDMABuffer()
@@ -261,6 +264,9 @@ class RGB64x32MatrixPanel_I2S_DMA : public GFX {
         #endif 		
       
         i2s_parallel_flip_to_buffer(&I2S1, back_buffer_id);
+
+        // Wait before we allow any writing to the buffer. Stop flicker.
+        while(!i2s_parallel_is_previous_buffer_free()) {}               
     }
     
     
-- 
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