SAKURA Internet / mbed-dev

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Diff: drivers/SPI.h

Revision:
170:19eb464bc2be
Parent:
169:e3b6fe271b81
Child:
174:b96e65c34a4d
--- a/drivers/SPI.h	Wed Jul 19 17:31:21 2017 +0100
+++ b/drivers/SPI.h	Thu Aug 03 13:13:39 2017 +0100
@@ -143,6 +143,15 @@
      */
     virtual void unlock(void);
 
+    /** Set default write data
+      * SPI requires the master to send some data during a read operation.
+      * Different devices may require different default byte values.
+      * For example: A SD Card requires default bytes to be 0xFF.
+      *
+      * @param data    Default character to be transmitted while read operation
+      */
+    void set_default_write_value(char data);
+
 #if DEVICE_SPI_ASYNCH
 
     /** Start non-blocking SPI transfer using 8bit buffers.
@@ -271,6 +280,7 @@
     int _bits;
     int _mode;
     int _hz;
+    char _write_fill;
 
 private:
     /* Private acquire function without locking/unlocking