From 055ff08fe51da232c28d0fffeda6a4808eb141c1 Mon Sep 17 00:00:00 2001
From: mrfaptastic <12006953+mrfaptastic@users.noreply.github.com>
Date: Thu, 19 Aug 2021 19:34:40 +0100
Subject: [PATCH] Double buffer function reduction

Can't get rid of the wait while statement though...
---
 ESP32-HUB75-MatrixPanel-I2S-DMA.h | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/ESP32-HUB75-MatrixPanel-I2S-DMA.h b/ESP32-HUB75-MatrixPanel-I2S-DMA.h
index f8648a1..93b5227 100644
--- a/ESP32-HUB75-MatrixPanel-I2S-DMA.h
+++ b/ESP32-HUB75-MatrixPanel-I2S-DMA.h
@@ -388,7 +388,7 @@ class MatrixPanel_I2S_DMA {
       // Setup the ESP32 DMA Engine. Sprite_TM built this stuff.
       configureDMA(m_cfg); //DMA and I2S configuration and setup
 
-      showDMABuffer(); // show backbuf_id of 0
+      //showDMABuffer(); // show backbuf_id of 0
 
       #if SERIAL_DEBUG 
         if (!initialized)    
@@ -492,7 +492,7 @@ class MatrixPanel_I2S_DMA {
     static void color565to888(const uint16_t color, uint8_t &r, uint8_t &g, uint8_t &b);
 
 
-    inline void flipDMABuffer() 
+    inline void IRAM_ATTR flipDMABuffer() 
     {         
       if ( !m_cfg.double_buff) return;
         
@@ -503,25 +503,12 @@ class MatrixPanel_I2S_DMA {
                 Serial.printf_P(PSTR("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()) { delay(1); }       
-    }
-    
-    inline void showDMABuffer()
-    {
-      
-        if (!m_cfg.double_buff) return;
-
-        #if SERIAL_DEBUG     
-                Serial.printf_P(PSTR("Showtime for buffer: %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()) { delay(1); }               
+        while(i2s_parallel_is_previous_buffer_free() == false) { }       
     }
-    
+        
     inline void setPanelBrightness(int b)
     {
       // Change to set the brightness of the display, range of 1 to matrixWidth (i.e. 1 - 64)