diff --git a/mcufriend_special.h b/mcufriend_special.h
index 3f209d2..b3ee316 100644
--- a/mcufriend_special.h
+++ b/mcufriend_special.h
@@ -10,6 +10,8 @@
 //#define USE_BLD_BST_MEGA2560
 //#define USE_DUE_8BIT_PROTOSHIELD
 //#define USE_DUE_16BIT_SHIELD        //RD on PA15 (D24) 
+//#define USE_BOBCACHELOT_TEENSY
+//#define USE_FRDM_K20
 
 #if 0
 #elif defined(__AVR_ATmega328P__) && defined(USE_SSD1289_SHIELD_UNO)    //on UNO
@@ -759,6 +761,91 @@ static inline void write_8(uint8_t val)
 #define PIN_HIGH(port, pin)   (port)->PIO_SODR = (1<<(pin))
 #define PIN_OUTPUT(port, pin) (port)->PIO_OER = (1<<(pin))
 
+#elif defined(__MK20DX256__) && defined(USE_BOBCACHELOT_TEENSY) // special for BOBCACHEALOT_TEENSY
+#warning  special for BOBCACHEALOT_TEENSY
+#define RD_PORT GPIOD
+#define RD_PIN  1
+#define WR_PORT GPIOC
+#define WR_PIN  0
+#define CD_PORT GPIOB
+#define CD_PIN  0
+#define CS_PORT GPIOB
+#define CS_PIN  1
+#define RESET_PORT GPIOB
+#define RESET_PIN  3
+
+// configure macros for the data pins
+#define CMASK ((1<<3))
+#define DMASK ((1<<0)|(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<7))
+
+  #define write_8(d) { \
+   GPIOC_PCOR = CMASK; GPIOD_PCOR = DMASK; \
+   GPIOC_PSOR = (((d) & (1<<1)) << 2); \
+   GPIOD_PSOR = (d) & DMASK; \
+  } 
+  #define read_8() (          (GPIOD_PDIR & DMASK) | (GPIOC_PDIR & (1<<3)) >> 2 )
+  #define setWriteDir() {GPIOC_PDDR |=  CMASK;GPIOD_PDDR |=  DMASK; }
+  #define setReadDir()  {GPIOC_PDDR &= ~CMASK;GPIOD_PDDR &= ~DMASK; }
+
+#define write8(x)     { write_8(x); WR_STROBE; }
+#define write16(x)    { uint8_t h = (x)>>8, l = x; write8(h); write8(l); }
+#define READ_8(dst)   { RD_STROBE; dst = read_8(); RD_IDLE; }
+#define READ_16(dst)  { uint8_t hi; READ_8(hi); READ_8(dst); dst |= (hi << 8); }
+
+#define PASTE(x, y)   x ## y
+
+#define PIN_LOW(port, pin)    PASTE(port, _PCOR) =  (1<<(pin))
+#define PIN_HIGH(port, pin)   PASTE(port, _PSOR) =  (1<<(pin))
+#define PIN_OUTPUT(port, pin) PASTE(port, _PDDR) |= (1<<(pin))
+
+#elif defined(__MK20DX128__) && defined(USE_FRDM_K20) // Uno Shield on FRDM-K20
+#warning Uno Shield on FRDM-K20
+#define RD_PORT GPIOC
+#define RD_PIN  0
+#define WR_PORT GPIOC
+#define WR_PIN  1
+#define CD_PORT GPIOD
+#define CD_PIN  6
+#define CS_PORT GPIOD
+#define CS_PIN  5
+#define RESET_PORT GPIOB
+#define RESET_PIN  1
+
+// configure macros for the data pins
+#define AMASK ((1<<12)|(1<<5)|(1<<2)|(1<<1))
+#define CMASK ((1<<8)|(1<<4)|(1<<3))
+#define DMASK ((1<<4))
+  #define write_8(d) { \
+   GPIOA_PCOR = AMASK; GPIOC_PCOR = CMASK; GPIOD_PCOR = DMASK; \
+   GPIOA_PSOR =      (((d) & (1<<0)) << 12) \
+                  | (((d) & (1<<1)) << 1) \
+                  |	(((d) & (1<<2)) << 3) \
+                  | (((d) & (1<<5)) >> 4); \
+   GPIOC_PSOR =      (((d) & (1<<4)) << 4) \
+                  | (((d) & (3<<6)) >> 3); \
+   GPIOD_PSOR =      (((d) & (1<<3)) << 1); \
+  } 
+  #define read_8() (          (((GPIOA_PDIR & (1<<5)) >> 3) \
+                             | ((GPIOA_PDIR & (1<<1)) << 4) \
+                             | ((GPIOA_PDIR & (1<<12)) >> 12) \
+                             | ((GPIOA_PDIR & (1<<2))  >> 1) \
+                             | ((GPIOC_PDIR & (1<<8))  >> 4) \
+                             | ((GPIOC_PDIR & (3<<3))  << 3) \
+                             | ((GPIOD_PDIR & (1<<4))  >> 1)))
+  #define setWriteDir() {GPIOA_PDDR |=  AMASK;GPIOC_PDDR |=  CMASK;GPIOD_PDDR |=  DMASK; }
+  #define setReadDir()  {GPIOA_PDDR &= ~AMASK;GPIOC_PDDR &= ~CMASK;GPIOD_PDDR &= ~DMASK; }
+
+#define write8(x)     { write_8(x); WR_STROBE; }
+#define write16(x)    { uint8_t h = (x)>>8, l = x; write8(h); write8(l); }
+#define READ_8(dst)   { RD_STROBE; dst = read_8(); RD_IDLE; }
+#define READ_16(dst)  { uint8_t hi; READ_8(hi); READ_8(dst); dst |= (hi << 8); }
+
+#define PASTE(x, y)   x ## y
+
+#define PIN_LOW(port, pin)    PASTE(port, _PCOR) =  (1<<(pin))
+#define PIN_HIGH(port, pin)   PASTE(port, _PSOR) =  (1<<(pin))
+#define PIN_OUTPUT(port, pin) PASTE(port, _PDDR) |= (1<<(pin))
+
 #else
 #define USE_SPECIAL_FAIL
 #endif