diff --git a/utility/mcufriend_shield.h b/utility/mcufriend_shield.h
index db5ea8d..7347ea7 100644
--- a/utility/mcufriend_shield.h
+++ b/utility/mcufriend_shield.h
@@ -9,6 +9,8 @@
 #define RD_ACTIVE16 {RD_ACTIVE8; RD_ACTIVE8;}
 #define WR_IDLE2  {WR_IDLE; WR_IDLE;}
 #define WR_IDLE4  {WR_IDLE2; WR_IDLE2;}
+#define RD_IDLE2  {RD_IDLE; RD_IDLE;}
+#define RD_IDLE4  {RD_IDLE2; RD_IDLE2;}
 
 #if defined(USE_SPECIAL)
 #include "mcufriend_special.h"
@@ -418,7 +420,7 @@ void write_8(uint8_t x)
 #define WRITE_DELAY { WR_ACTIVE8; } //120MHz
 #define IDLE_DELAY  { WR_IDLE2;WR_IDLE; }
 #define READ_DELAY  { RD_ACTIVE16;}
-#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOCEN; }
+#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIODEN | RCC_AHB1ENR_GPIOEEN | RCC_AHB1ENR_GPIOFEN; }
 #define PIN_OUTPUT(port, pin) PIN_MODE2((port)->MODER, pin, 0x1)
 
 #elif defined(STM32F303xE)
@@ -444,7 +446,7 @@ void write_8(uint8_t x)
 #define WRITE_DELAY { WR_ACTIVE8; } //180MHz
 #define IDLE_DELAY  { WR_IDLE2;WR_IDLE; }
 #define READ_DELAY  { RD_ACTIVE16;}
-#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOCEN; }
+#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIODEN | RCC_AHB1ENR_GPIOEEN | RCC_AHB1ENR_GPIOFEN; }
 #define PIN_OUTPUT(port, pin) PIN_MODE2((port)->MODER, pin, 0x1)
 
 #elif defined(STM32F446xx)
@@ -456,10 +458,10 @@ void write_8(uint8_t x)
 
 #elif defined(STM32F767xx)
 #warning DELAY macros untested yet
-#define WRITE_DELAY { WR_ACTIVE8;WR_ACTIVE8; } //216MHz
-#define IDLE_DELAY  { WR_IDLE4;WR_IDLE; }
-#define READ_DELAY  { RD_ACTIVE16;RD_ACTIVE16;}
-#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOCEN; }
+#define WRITE_DELAY { WR_ACTIVE8;WR_ACTIVE2; } //216MHz
+#define IDLE_DELAY  { WR_IDLE2;WR_IDLE; }
+#define READ_DELAY  { RD_ACTIVE16;RD_ACTIVE16;RD_ACTIVE4;}
+#define GPIO_INIT()   { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOCEN | RCC_AHB1ENR_GPIODEN | RCC_AHB1ENR_GPIOEEN | RCC_AHB1ENR_GPIOFEN; }
 #define PIN_OUTPUT(port, pin) PIN_MODE2((port)->MODER, pin, 0x1)
 
 #elif defined(STM32L053xx)
@@ -484,7 +486,7 @@ void write_8(uint8_t x)
 #warning DELAY macros untested yet
 #define WRITE_DELAY { WR_ACTIVE2; } //80MHz
 #define READ_DELAY  { RD_ACTIVE4; RD_ACTIVE; }
-#define GPIO_INIT()   { RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN | RCC_AHB2ENR_GPIOBEN | RCC_AHB2ENR_GPIOCEN; }
+#define GPIO_INIT()   { RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN | RCC_AHB2ENR_GPIOCEN | RCC_AHB2ENR_GPIODEN | RCC_AHB2ENR_GPIOEEN | RCC_AHB2ENR_GPIOFEN; }
 #define PIN_OUTPUT(port, pin) PIN_MODE2((port)->MODER, pin, 0x1)
 
 #else
@@ -663,7 +665,7 @@ void write_8(uint8_t x)
 
 #define write8(x)     { write_8(x); WRITE_DELAY; WR_STROBE; IDLE_DELAY; }
 #define write16(x)    { uint8_t h = (x)>>8, l = x; write8(h); write8(l); }
-#define READ_8(dst)   { RD_STROBE; READ_DELAY; dst = read_8(); RD_IDLE; RD_IDLE; }
+#define READ_8(dst)   { RD_STROBE; READ_DELAY; dst = read_8(); RD_IDLE2; RD_IDLE; }
 #define READ_16(dst)  { uint8_t hi; READ_8(hi); READ_8(dst); dst |= (hi << 8); }
 
 //################################### ESP32 ##############################