Update ESP32-HUB75-MatrixPanel-I2S-DMA.h

1 files changed, 5 insertions, 4 deletions

diff --git a/ESP32-HUB75-MatrixPanel-I2S-DMA.h b/ESP32-HUB75-MatrixPanel-I2S-DMA.h
index 93b5227..bcfd671 100644
--- a/ESP32-HUB75-MatrixPanel-I2S-DMA.h
+++ b/ESP32-HUB75-MatrixPanel-I2S-DMA.h
@@ -496,17 +496,18 @@ class MatrixPanel_I2S_DMA {
     {         
       if ( !m_cfg.double_buff) return;
         
-        // Flip to other buffer as the backbuffer. i.e. Graphic changes happen to this buffer (but aren't displayed until showDMABuffer())
-        back_buffer_id ^= 1; 
-        
         #if SERIAL_DEBUG     
                 Serial.printf_P(PSTR("Set back buffer to: %d\n"), back_buffer_id);
         #endif      
 
         i2s_parallel_flip_to_buffer(I2S_NUM_0, back_buffer_id);
-
+		
         // Wait before we allow any writing to the buffer. Stop flicker.
         while(i2s_parallel_is_previous_buffer_free() == false) { }       
+		
+        // Flip to other buffer as the backbuffer. i.e. Graphic changes happen to this buffer (but aren't displayed until showDMABuffer())
+        back_buffer_id ^= 1; 
+		
     }
         
     inline void setPanelBrightness(int b)