add spi access to sd card

src/drivers/devices/esp32CAM.h

@@ -6,7 +6,14 @@
 
 #define NO_DISPLAY
 
-// SDMMC interface: 1-bit mode (might cause issues):
+// example how to configure SD card.
+// if you would define everything, 
+// to select 1 bit mode, make sure SDMMC_D1-3 are undefined
+// to use spi mode, make sure all SDMMC_x pins are undefined
+
+/*
+// use SDMMC interface:
+// 1-bit mode (might cause issues):
 #define SDMMC_CLK 14
 #define SDMMC_CMD 15
 #define SDMMC_D0 2
@@ -14,5 +21,16 @@
 #define SDMMC_D1 4
 #define SDMMC_D2 12
 #define SDMMC_D3 13
+*/
+
+// use SPI interface
+// (default SPI unit provided by <SPI.h>)
+// setup SPI pins.
+#define SDSPI_CS    13
+// The following pins will be ignored, if a tft display is set up. (!defined NO_DISPLAY)
+// check display settings to find the appropriate lines. 
+#define SDSPI_CLK   14
+#define SDSPI_MOSI  15
+#define SDSPI_MISO  2
 
 #endif // _ESP32_CAM_H_

src/drivers/storage/SDCard.cpp

@@ -9,16 +9,22 @@
 #include  "SDCard.h"
 
 #if defined (BUILD_SDMMC_1) || defined(BUILD_SDMMC_4)
-
 #include <SD_MMC.h>
+#elif defined (BUILD_SDSPI)
+#include <SD.h>
+#include <SPI.h>
+#endif // interface type
+
+#if defined (BUILD_SDMMC_1) || defined(BUILD_SDMMC_4) || defined (BUILD_SDSPI)
 
 SDCard::SDCard()
 {
 #if defined (BUILD_SDMMC_1) || defined(BUILD_SDMMC_4)
     iSD_ = &SD_MMC;
 #elif defined (BUILD_SDSPI)
-#error You chose to run the sd card in SPI mode. This is not implemented yet.
+    ispi_ = &SPI;
-#endif 
+    iSD_ = &SD;
+#endif // interface type
 }
 
 SDCard::~SDCard()
@@ -94,6 +100,9 @@ bool SDCard::loadConfigFile(TSettings* Settings)
 void SDCard::unmount()
 {
     iSD_->end();
+#ifdef BUILD_SDSPI_SETUP
+    ispi_->end();
+#endif // BUILD_SDSPI_SETUP 
     Serial.println("SDCard: Unmounted");
 }
 
@@ -111,19 +120,27 @@ bool SDCard::initSDcard()
     if (iSD_->cardType() == CARD_NONE)
     {
         iSD_->setPins(SDMMC_CLK, SDMMC_CMD, SDMMC_D0, SDMMC_D1, SDMMC_D2, SDMMC_D3);
-        Serial.println("SDCard: 4-Bit Mode.");
         cardInitialized = iSD_->begin("/sd", false);
+        Serial.println("SDCard: 4-Bit Mode.");
     }
 #elif defined (BUILD_SDMMC_1)
-    #warning SDMMC : 1 - bit mode is not always working.If you experience issues, try other modes.
+    #warning SDMMC : 1 - bit mode is not always working. If you experience issues, try other modes.
     if (iSD_->cardType() == CARD_NONE)
     {
         iSD_->setPins(SDMMC_CLK, SDMMC_CMD, SDMMC_D0);
-            Serial.println("SDCard: 1-Bit Mode.");
         cardInitialized = iSD_->begin("/sd", true);
+        Serial.println("SDCard: 1-Bit Mode.");
     }
 #elif defined (BUILD_SDSPI)
-#error You chose to run the sd card in SPI mode. This is not implemented yet.
+    if (iSD_->cardType() == CARD_NONE)
+    {
+        #ifdef BUILD_SDSPI_SETUP
+        ispi_->end();
+        ispi_->begin(SDSPI_CLK, SDSPI_MISO, SDSPI_MOSI, SDSPI_CS);      
+        #endif //BUILD_SDSPI_SETUP
+        cardInitialized = iSD_->begin(SDSPI_CS, *ispi_);
+        Serial.println("SDCard: SPI mode.");
+    }
 #else
     Serial.println("SDCard: interface not available.");
     return false;

src/drivers/storage/SDCard.h

@@ -5,14 +5,31 @@
 #include "nvMemory.h"
 #include "..\devices\device.h"
 
+// configuration example and description in /devices/esp32cam.h
+
+// select interface and options according to provided pins
 #if defined (SDMMC_D0) && defined (SDMMC_D1) && defined (SDMMC_D2) && defined (SDMMC_D3)
 #define BUILD_SDMMC_4
+#undef BUILD_SDMMC_1
+#undef BUILD_SDSPI
 #include <SD_MMC.h>
+#warning SD card support in 4-Bit mode enabled!
 #elif defined (SDMMC_D0) && !(defined (SDMMC_D1) && defined (SDMMC_D2) && defined (SDMMC_D3))
 #define BUILD_SDMMC_1
+#undef BUILD_SDMMC_4
+#undef BUILD_SDSPI
 #include <SD_MMC.h>
-#else
+#warning SD card support in 1-Bit mode enabled!
-#warning SD card support disabled!
+#elif defined (SDSPI_CS)
+#undef BUILD_SDMMC_1
+#undef BUILD_SDMMC_4
+#define BUILD_SDSPI
+#if defined (SDSPI_CLK) && defined (SDSPI_MOSI) && defined (SDSPI_MISO) && defined (NO_DISPLAY)
+#define BUILD_SDSPI_SETUP
+#endif // SPIPINS
+#include <SPI.h>
+#include <SD.h>
+#warning SD card support in SPI mode enabled!
 #endif
 
 // Handles the transfer of settings from sd card to nv memory (wifi credentials are handled by wifimanager)
@@ -30,7 +47,7 @@ private:
 #if defined (BUILD_SDMMC_1) || defined(BUILD_SDMMC_4)
     fs::SDMMCFS* iSD_;
 #elif defined (BUILD_SDSPI)
-#error You chose to run the SD card in SPI mode. This is not implemented yet.
+    SPIClass* ispi_;
     fs::SDFS* iSD_;
 #endif
 };