Add build option for configuring the amount of SPIRAM to leave free for IDF allocation (#2379)

Author: mikeoliphant

CMakePresets.json

@@ -57,7 +57,8 @@
                 "API_nanoFramework.Hardware.Esp32.Rmt": "ON",
                 "API_nanoFramework.ResourceManager": "ON",
                 "API_nanoFramework.System.Collections": "ON",
-                "API_nanoFramework.System.Text": "ON"
+                "API_nanoFramework.System.Text": "ON",
+                "ESP32_SPIRAM_FOR_IDF_ALLOCATION": "256 * 1024"
             }
         },
         {
@@ -89,7 +90,8 @@
                 "API_nanoFramework.Hardware.Esp32.Rmt": "ON",
                 "API_nanoFramework.ResourceManager": "ON",
                 "API_nanoFramework.System.Collections": "ON",
-                "API_nanoFramework.System.Text": "ON"
+                "API_nanoFramework.System.Text": "ON",
+                "ESP32_SPIRAM_FOR_IDF_ALLOCATION": "256 * 1024"
             }
         },
         {
@@ -527,7 +529,8 @@
                 "GRAPHICS_DISPLAY": "ILI9342_320x240_SPI.cpp",
                 "TOUCHPANEL_DEVICE": "XPT2046.cpp",
                 "GRAPHICS_DISPLAY_INTERFACE": "Spi_To_Display.cpp",
-                "TOUCHPANEL_INTERFACE": "Spi_To_TouchPanel.cpp"
+                "TOUCHPANEL_INTERFACE": "Spi_To_TouchPanel.cpp",
+                "ESP32_SPIRAM_FOR_IDF_ALLOCATION": "1024 * 1024"
             }
         },
         {

targets/ESP32/_nanoCLR/Memory.cpp

@@ -20,9 +20,6 @@
 
 static const char *TAG = "Memory";
 
-// Space to leave free in SPIRAM for allocation by IDF malloc
-#define SPIRAM_MEMORY_LEAVE_FOR_ALLOCATION (256 * 1024)
-
 #if HAL_USE_BLE
 // Reduce Managed heap if using BLE without spiram
 #define INTERNAL_RAM_LEAVE_FREE_FOR_ALLOCATION (30 * 1024)
@@ -120,7 +117,7 @@ void HeapLocation(unsigned char *&baseAddress, unsigned int &sizeInBytes)
             largestFreeBlock = spiramMaxSize;
 
             // get heap size to allocate
-            managedHeapSize = spiramMaxSize - SPIRAM_MEMORY_LEAVE_FOR_ALLOCATION;
+            managedHeapSize = spiramMaxSize - ESP32_SPIRAM_FOR_IDF_ALLOCATION;
 
             ESP_LOGI(TAG, "Allocating managed heap from SPIRAM");
         }

targets/ESP32/_nanoCLR/target_platform.h.in

@@ -8,10 +8,11 @@
 
 #include "esp32_ethernet_options.h"
 
-#define NANOCLR_GRAPHICS  @NANOCLR_GRAPHICS@
-#define HAL_USE_SPI       @HAL_USE_SPI_OPTION@
-#define HAL_USE_SDC       @HAL_USE_SDC_OPTION@
-#define HAL_USE_BLE       @HAL_USE_BLE_OPTION@
+#define NANOCLR_GRAPHICS                @NANOCLR_GRAPHICS@
+#define ESP32_SPIRAM_FOR_IDF_ALLOCATION @ESP32_SPIRAM_FOR_IDF_ALLOCATION@
+#define HAL_USE_SPI                     @HAL_USE_SPI_OPTION@
+#define HAL_USE_SDC                     @HAL_USE_SDC_OPTION@
+#define HAL_USE_BLE                     @HAL_USE_BLE_OPTION@
 
 #if (HAL_USE_SDC == TRUE)
 #define SDC_MAX_OPEN_FILES 5