Merge pull request #76 from chvvkumar/Dev

bug: fix cache misalignment

Author: chvvkumar

.github/workflows/arduino-compile.yml

@@ -2,7 +2,7 @@ name: Arduino Compilation Check
 
 on:
   push:
-    branches: [ main, Snd, Dev ]
+    branches: [ main ]
     paths-ignore:
       - '**.md'
       - 'docs/**'

.github/workflows/file-structure.yml

@@ -2,7 +2,7 @@ name: File Structure Validation
 
 on:
   push:
-    branches: [ main, Snd, Dev ]
+    branches: [ main ]
   pull_request:
     branches: [ main, Snd, Dev ]
   workflow_dispatch:

.github/workflows/memory-analysis.yml

@@ -2,7 +2,7 @@ name: Memory Usage Analysis
 
 on:
   push:
-    branches: [ main, Snd, Dev ]
+    branches: [ main ]
   pull_request:
     branches: [ main, Snd, Dev ]
   workflow_dispatch:

ppa_accelerator.cpp

@@ -131,7 +131,9 @@ bool PPAAccelerator::scaleRotateImage(uint16_t* srcPixels, int16_t srcWidth, int
     memcpy(ppa_src_buffer, srcPixels, srcSize);
 
     // Ensure cache coherency for DMA operations
-    esp_cache_msync(ppa_src_buffer, srcSize, ESP_CACHE_MSYNC_FLAG_DIR_C2M);
+    // Size must be aligned to cache line size (64 bytes)
+    size_t srcSizeAligned = (srcSize + 63) & ~63;
+    esp_cache_msync(ppa_src_buffer, srcSizeAligned, ESP_CACHE_MSYNC_FLAG_DIR_C2M);
 
     // Configure PPA scaling and rotation operation
     ppa_srm_oper_config_t srm_oper_config = {};
@@ -184,7 +186,9 @@ bool PPAAccelerator::scaleRotateImage(uint16_t* srcPixels, int16_t srcWidth, int
     }
 
     // Ensure cache coherency for reading results
-    esp_cache_msync(ppa_dst_buffer, dstSize, ESP_CACHE_MSYNC_FLAG_DIR_M2C);
+    // Size must be aligned to cache line size (64 bytes)
+    size_t dstSizeAligned = (dstSize + 63) & ~63;
+    esp_cache_msync(ppa_dst_buffer, dstSizeAligned, ESP_CACHE_MSYNC_FLAG_DIR_M2C);
 
     // Copy result to destination buffer
     memcpy(dstPixels, ppa_dst_buffer, dstSize);