From ace8d938eeba00842a9c8729c425b75971f0aba8 Mon Sep 17 00:00:00 2001
From: mrfaptastic <12006953+mrfaptastic@users.noreply.github.com>
Date: Wed, 25 Jan 2023 23:46:34 +0000
Subject: Update ESP32-HUB75-MatrixPanel-I2S-DMA.h

---
 src/ESP32-HUB75-MatrixPanel-I2S-DMA.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/ESP32-HUB75-MatrixPanel-I2S-DMA.h b/src/ESP32-HUB75-MatrixPanel-I2S-DMA.h
index 2b76152..ab232b9 100644
--- a/src/ESP32-HUB75-MatrixPanel-I2S-DMA.h
+++ b/src/ESP32-HUB75-MatrixPanel-I2S-DMA.h
@@ -202,7 +202,7 @@ struct  HUB75_I2S_CFG {
   /**
    * I2S clock speed selector
    */
-  enum clk_speed {HZ_10M=10000000, HZ_15M=15000000, HZ_20M=20000000};
+  enum clk_speed {HZ_8M=8000000, HZ_10M=10000000, HZ_15M=15000000, HZ_20M=20000000};
 
   // Structure Variables
 
@@ -342,6 +342,11 @@ class MatrixPanel_I2S_DMA {
       if (m_cfg.driver)
         shiftDriver(m_cfg);
           
+        #if defined(SPIRAM_DMA_BUFFER)     
+		 // Trick library into dropping colour depth slightly when using PSRAM.
+		 // Actual output clockrate override occurs in configureDMA
+          m_cfg.i2sspeed = HUB75_I2S_CFG::HZ_8M;
+        #endif	           
 
      /* As DMA buffers are dynamically allocated, we must allocated in begin()
       * Ref: https://github.com/espressif/arduino-esp32/issues/831
-- 
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