Fix: allow 80MHz clock speed

src/ESP32-HUB75-MatrixPanel-I2S-DMA.h

@@ -135,10 +135,10 @@ struct rowBitStruct
   const bool double_buff;
   ESP32_I2S_DMA_STORAGE_TYPE *data;
 
-  /** @brief 
+  /** @brief
    * Returns size (in bytes) of row of data vectorfor a SINGLE buff for the number of colour depths requested
-   * 
-   * default - Returns full data vector size for a SINGLE buff. 
+   *
+   * default - Returns full data vector size for a SINGLE buff.
    *           You should only pass either PIXEL_COLOR_DEPTH_BITS or '1' to this
    *
    */
@@ -151,7 +151,7 @@ struct rowBitStruct
 
   /** @brief
    * Returns pointer to the row's data vector beginning at pixel[0] for _dpth colour bit
-   * 
+   *
    * NOTE: this call might be very slow in loops. Due to poor instruction caching in esp32 it might be required a reread from flash
    * every loop cycle, better use inlined #define instead in such cases
    */
@@ -306,7 +306,7 @@ struct HUB75_I2S_CFG
   bool clkphase;
 
   // Minimum refresh / scan rate needs to be configured on start due to LSBMSB_TRANSITION_BIT calculation in allocateDMAmemory()
-  uint8_t min_refresh_rate;
+  uint16_t min_refresh_rate;
 
   // struct constructor
   HUB75_I2S_CFG(
@@ -491,14 +491,13 @@ public:
   {
     uint8_t r, g, b;
     color565to888(color, r, g, b);
-    
+
     int16_t w = 1;
     transform(x, y, w, h);
     if (h > w)
       vlineDMA(x, y, h, r, g, b);
     else
       hlineDMA(x, y, w, r, g, b);
-
   }
   // rgb888 overload
   virtual inline void drawFastVLine(int16_t x, int16_t y, int16_t h, uint8_t r, uint8_t g, uint8_t b)
@@ -526,7 +525,6 @@ public:
       vlineDMA(x, y, h, r, g, b);
     else
       hlineDMA(x, y, w, r, g, b);
-
   }
   // rgb888 overload
   virtual inline void drawFastHLine(int16_t x, int16_t y, int16_t w, uint8_t r, uint8_t g, uint8_t b)
@@ -547,18 +545,16 @@ public:
   {
     uint8_t r, g, b;
     color565to888(color, r, g, b);
-    
+
     transform(x, y, w, h);
     fillRectDMA(x, y, w, h, r, g, b);
-    
   }
   // rgb888 overload
   virtual inline void fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint8_t r, uint8_t g, uint8_t b)
   {
-    
+
     transform(x, y, w, h);
     fillRectDMA(x, y, w, h, r, g, b);
-    
   }
 #endif
 
@@ -572,8 +568,8 @@ public:
 #endif
 
 #ifdef NO_GFX
-    inline int16_t width() const { return m_cfg.mx_width * m_cfg.chain_length; }
-    inline int16_t height() const { return m_cfg.mx_height; }
+  inline int16_t width() const { return m_cfg.mx_width * m_cfg.chain_length; }
+  inline int16_t height() const { return m_cfg.mx_height; }
 #endif
 
   void drawIcon(int *ico, int16_t x, int16_t y, int16_t cols, int16_t rows);
@@ -600,15 +596,12 @@ public:
     {
       return;
     }
-	
-    dma_bus.flip_dma_output_buffer(back_buffer_id);
-	
-	//back_buffer_id ^= 1;
-	back_buffer_id = back_buffer_id^1;
-    fb = &frame_buffer[back_buffer_id];	
-	
 
-	
+    dma_bus.flip_dma_output_buffer(back_buffer_id);
+
+    // back_buffer_id ^= 1;
+    back_buffer_id = back_buffer_id ^ 1;
+    fb = &frame_buffer[back_buffer_id];
   }
 
   /**
@@ -713,14 +706,14 @@ protected:
    */
   inline void resetbuffers()
   {
-    clearFrameBuffer(0);        
-    brtCtrlOEv2(brightness, 0); 
+    clearFrameBuffer(0);
+    brtCtrlOEv2(brightness, 0);
 
-    if (m_cfg.double_buff) {
-		
-      clearFrameBuffer(1);        
+    if (m_cfg.double_buff)
+    {
+
+      clearFrameBuffer(1);
       brtCtrlOEv2(brightness, 1);
-
     }
   }
 
@@ -777,7 +770,7 @@ private:
   /**
    * @brief - DP3246-family chips initialization routine
    */
-  void dp3246init(const HUB75_I2S_CFG& _cfg);
+  void dp3246init(const HUB75_I2S_CFG &_cfg);
 
   /**
    * @brief - reset OE bits in DMA buffer in a way to control brightness
@@ -841,7 +834,6 @@ protected:
   Bus_Parallel16 dma_bus;
 
 private:
-
   // Matrix i2s settings
   HUB75_I2S_CFG m_cfg;
 
@@ -855,9 +847,9 @@ private:
   frameStruct frame_buffer[2];
   frameStruct *fb; // What framebuffer we are writing pixel changes to? (pointer to either frame_buffer[0] or frame_buffer[1] basically ) used within updateMatrixDMABuffer(...)
 
-  volatile int back_buffer_id = 0;      // If using double buffer, which one is NOT active (ie. being displayed) to write too?
-  int brightness = 128;        // If you get ghosting... reduce brightness level. ((60/64)*255) seems to be the limit before ghosting on a 64 pixel wide physical panel for some panels.
-  int lsbMsbTransitionBit = 0; // For colour depth calculations
+  volatile int back_buffer_id = 0; // If using double buffer, which one is NOT active (ie. being displayed) to write too?
+  int brightness = 128;            // If you get ghosting... reduce brightness level. ((60/64)*255) seems to be the limit before ghosting on a 64 pixel wide physical panel for some panels.
+  int lsbMsbTransitionBit = 0;     // For colour depth calculations
 
   /* ESP32-HUB75-MatrixPanel-I2S-DMA functioning constants
    * we should not those once object instance initialized it's DMA structs