diff --git a/02_m1284p_FATFS_Chang_tst/mmc_avr.c b/02_m1284p_FATFS_Chang_tst/mmc_avr.c
index af1fbd8..2d59360 100644
--- a/02_m1284p_FATFS_Chang_tst/mmc_avr.c
+++ b/02_m1284p_FATFS_Chang_tst/mmc_avr.c
@@ -19,7 +19,7 @@
 
 #include <avr/io.h>
 #include "diskio.h"
-
+#include "globals.h"
 
 /* Port controls  (Platform dependent) */
 
@@ -113,18 +113,24 @@ void power_on (void)
 	DDRB  |= _BV(MOSI) | _BV(SCK) | _BV(CSN);
 	PORTB |= _BV(MOSI) | _BV(SCK);
 
+
+#if defined(SPI_8_MHZ)
 	/* Enables SPI, selects "master", clock rate FCK / 2, and SPI mode 0 */
 	// SPI 8Mhz
-	/*
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = _BV(SPI2X);
-	*/
-
+	SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#elif defined (SPI_4_MHZ)
 	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
 	// SPI 4Mhz
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = 0x0;
-	
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#else
+	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
+	// SPI 4Mhz
+	SPCR = _BV(SPE) | _BV(MSTR);
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#endif
+
 }
 
 static
diff --git a/02_m1284p_FATFS_LFN_Chang_tst/mmc_avr.c b/02_m1284p_FATFS_LFN_Chang_tst/mmc_avr.c
index af1fbd8..2d59360 100644
--- a/02_m1284p_FATFS_LFN_Chang_tst/mmc_avr.c
+++ b/02_m1284p_FATFS_LFN_Chang_tst/mmc_avr.c
@@ -19,7 +19,7 @@
 
 #include <avr/io.h>
 #include "diskio.h"
-
+#include "globals.h"
 
 /* Port controls  (Platform dependent) */
 
@@ -113,18 +113,24 @@ void power_on (void)
 	DDRB  |= _BV(MOSI) | _BV(SCK) | _BV(CSN);
 	PORTB |= _BV(MOSI) | _BV(SCK);
 
+
+#if defined(SPI_8_MHZ)
 	/* Enables SPI, selects "master", clock rate FCK / 2, and SPI mode 0 */
 	// SPI 8Mhz
-	/*
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = _BV(SPI2X);
-	*/
-
+	SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#elif defined (SPI_4_MHZ)
 	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
 	// SPI 4Mhz
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = 0x0;
-	
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#else
+	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
+	// SPI 4Mhz
+	SPCR = _BV(SPE) | _BV(MSTR);
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#endif
+
 }
 
 static
diff --git a/03_m1284p_WIZNET_loopback_FATFS_template/globals.h b/03_m1284p_WIZNET_loopback_FATFS_template/globals.h
index 64217dc..3fabed6 100644
--- a/03_m1284p_WIZNET_loopback_FATFS_template/globals.h
+++ b/03_m1284p_WIZNET_loopback_FATFS_template/globals.h
@@ -38,6 +38,10 @@ static FATFS Fatfs;		//File system object for each logical drive. >= 2
 
 //#define IP_WORK
 
+//SPI CLOCK 4 or 8Mhz
+#define SPI_4_MHZ
+//#define SPI_8_MHZ
+
 extern unsigned long millis(void);
 extern int freeRam (void);
 
diff --git a/03_m1284p_WIZNET_loopback_FATFS_template/mmc_avr.c b/03_m1284p_WIZNET_loopback_FATFS_template/mmc_avr.c
index 0557785..2d59360 100644
--- a/03_m1284p_WIZNET_loopback_FATFS_template/mmc_avr.c
+++ b/03_m1284p_WIZNET_loopback_FATFS_template/mmc_avr.c
@@ -19,7 +19,7 @@
 
 #include <avr/io.h>
 #include "diskio.h"
-
+#include "globals.h"
 
 /* Port controls  (Platform dependent) */
 
@@ -113,17 +113,24 @@ void power_on (void)
 	DDRB  |= _BV(MOSI) | _BV(SCK) | _BV(CSN);
 	PORTB |= _BV(MOSI) | _BV(SCK);
 
+
+#if defined(SPI_8_MHZ)
 	/* Enables SPI, selects "master", clock rate FCK / 2, and SPI mode 0 */
 	// SPI 8Mhz
-	/*
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = _BV(SPI2X);
-	*/
-
+	SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#elif defined (SPI_4_MHZ)
+	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
+	// SPI 4Mhz
+	SPCR = _BV(SPE) | _BV(MSTR);
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#else
 	/* Enables SPI, selects "master", clock rate FCK / 4, and SPI mode 0 */
 	// SPI 4Mhz
 	SPCR = _BV(SPE) | _BV(MSTR);
-	SPSR = 0x0;
+	SPSR = 0x0; //FCK / 4 - 4Mhz
+#endif
+
 }
 
 static
diff --git a/03_m1284p_WIZNET_loopback_FATFS_template/spi.c b/03_m1284p_WIZNET_loopback_FATFS_template/spi.c
index 4f9ee2c..40fa017 100644
--- a/03_m1284p_WIZNET_loopback_FATFS_template/spi.c
+++ b/03_m1284p_WIZNET_loopback_FATFS_template/spi.c
@@ -30,6 +30,8 @@
 
 #include <avr/io.h>
 #include "spi.h"
+#include "globals.h"
+
 //#include "contiki-conf.h"
 
 /*
@@ -77,8 +79,13 @@ spi_init(void)
  
   /* Enables SPI, selects "master", clock rate FCK / 4 - 4Mhz, and SPI mode 0 */
   SPCR = _BV(SPE) | _BV(MSTR);
-  SPSR = 0x0;
-  //SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#if defined(SPI_8_MHZ)
+  SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#elif defined (SPI_4_MHZ)
+  SPSR = 0x0; //FCK / 4 - 4Mhz
+#else
+  SPSR = 0x0; //FCK / 4 - 4Mhz
+#endif
 
 
 }
diff --git a/03_m1284p_WIZNET_loopback_STATIC_IP/globals.h b/03_m1284p_WIZNET_loopback_STATIC_IP/globals.h
index f8c52ea..e71ae1d 100644
--- a/03_m1284p_WIZNET_loopback_STATIC_IP/globals.h
+++ b/03_m1284p_WIZNET_loopback_STATIC_IP/globals.h
@@ -41,6 +41,10 @@ static FATFS Fatfs;		//File system object for each logical drive. >= 2
 
 #define IP_WORK
 
+//SPI CLOCK 4 or 8Mhz
+#define SPI_4_MHZ
+//#define SPI_8_MHZ
+
 extern unsigned long millis(void);
 extern int freeRam (void);
 
diff --git a/03_m1284p_WIZNET_loopback_STATIC_IP/spi.c b/03_m1284p_WIZNET_loopback_STATIC_IP/spi.c
index 3dfca25..40fa017 100644
--- a/03_m1284p_WIZNET_loopback_STATIC_IP/spi.c
+++ b/03_m1284p_WIZNET_loopback_STATIC_IP/spi.c
@@ -30,6 +30,8 @@
 
 #include <avr/io.h>
 #include "spi.h"
+#include "globals.h"
+
 //#include "contiki-conf.h"
 
 /*
@@ -77,7 +79,13 @@ spi_init(void)
  
   /* Enables SPI, selects "master", clock rate FCK / 4 - 4Mhz, and SPI mode 0 */
   SPCR = _BV(SPE) | _BV(MSTR);
-  //SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#if defined(SPI_8_MHZ)
+  SPSR = _BV(SPI2X); //FCK / 2 - 8Mhz
+#elif defined (SPI_4_MHZ)
+  SPSR = 0x0; //FCK / 4 - 4Mhz
+#else
+  SPSR = 0x0; //FCK / 4 - 4Mhz
+#endif
 
 
 }