Add support to read/write raw sectors from/to sd card (espressif#4777)

Author: chegewara

libraries/SD/src/SD.cpp

@@ -103,4 +103,15 @@ uint64_t SDFS::usedBytes()
 	return size;
 }
 
+bool SDFS::readRAW(uint8_t* buffer, uint32_t sector)
+{
+    return sd_read_raw(_pdrv, buffer, sector);
+}
+
+bool SDFS::writeRAW(uint8_t* buffer, uint32_t sector)
+{
+    return sd_write_raw(_pdrv, buffer, sector);
+}
+
+
 SDFS SD = SDFS(FSImplPtr(new VFSImpl()));

libraries/SD/src/SD.h

@@ -34,6 +34,8 @@ class SDFS : public FS
     uint64_t cardSize();
     uint64_t totalBytes();
     uint64_t usedBytes();
+    bool readRAW(uint8_t* buffer, uint32_t sector);
+    bool writeRAW(uint8_t* buffer, uint32_t sector);
 };
 
 }

libraries/SD/src/sd_diskio.cpp

@@ -675,6 +675,15 @@ DRESULT ff_sd_ioctl(uint8_t pdrv, uint8_t cmd, void* buff)
     return RES_PARERR;
 }
 
+bool sd_read_raw(uint8_t pdrv, uint8_t* buffer, DWORD sector)
+{
+    return ff_sd_read(pdrv, buffer, sector, 1) == ESP_OK;
+}
+
+bool sd_write_raw(uint8_t pdrv, uint8_t* buffer, DWORD sector)
+{
+    return ff_sd_write(pdrv, buffer, sector, 1) == ESP_OK;
+}
 
 /*
  * Public methods

libraries/SD/src/sd_diskio.h

@@ -17,6 +17,7 @@
 #include "Arduino.h"
 #include "SPI.h"
 #include "sd_defines.h"
+// #include "diskio.h"
 
 uint8_t sdcard_init(uint8_t cs, SPIClass * spi, int hz);
 uint8_t sdcard_uninit(uint8_t pdrv);
@@ -27,5 +28,7 @@ uint8_t sdcard_unmount(uint8_t pdrv);
 sdcard_type_t sdcard_type(uint8_t pdrv);
 uint32_t sdcard_num_sectors(uint8_t pdrv);
 uint32_t sdcard_sector_size(uint8_t pdrv);
+bool sd_read_raw(uint8_t pdrv, uint8_t* buffer, uint32_t sector);
+bool sd_write_raw(uint8_t pdrv, uint8_t* buffer, uint32_t sector);
 
 #endif /* _SD_DISKIO_H_ */