Added shiftIn to F1 and F4

Author: rogerclarkmelbourne

STM32F1/cores/maple/io.h

@@ -160,4 +160,6 @@ uint16 analogRead(uint8 pin);
  */
 void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 value);
 
+uint32 shiftIn( uint32 ulDataPin, uint32 ulClockPin, uint32 ulBitOrder );
+
 #endif

STM32F1/cores/maple/wirish_shift.cpp

@@ -35,3 +35,28 @@ void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 value) {
 		gpio_toggle_bit(PIN_MAP[clockPin].gpio_device, PIN_MAP[clockPin].gpio_bit);// togglePin(clockPin);  
     }
 }
+
+uint32_t shiftIn( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder )
+{
+  uint8_t value = 0 ;
+  uint8_t i ;
+
+  
+  for ( i=0 ; i < 8 ; ++i )
+  {
+    digitalWrite( ulClockPin, HIGH ) ;
+
+    if ( ulBitOrder == LSBFIRST )
+    {
+      value |= digitalRead( ulDataPin ) << i ;
+    }
+    else
+    {
+      value |= digitalRead( ulDataPin ) << (7 - i) ;
+    }
+
+    digitalWrite( ulClockPin, LOW ) ;
+  }
+
+  return value ;
+}

STM32F4/cores/maple/io.h

@@ -218,5 +218,7 @@ uint8 waitForButtonPress(uint32 timeout_millis=0);
  */
 void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 value);
 
+uint32 shiftIn( uint32 ulDataPin, uint32 ulClockPin, uint32 ulBitOrder );
+
 #endif
 

STM32F4/cores/maple/wirish_shift.cpp

@@ -38,3 +38,28 @@ void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 val) {
         digitalWrite(clockPin, LOW);
     }
 }
+
+uint32 shiftIn( uint32 ulDataPin, uint32 ulClockPin, uint32 ulBitOrder )
+{
+  uint8_t value = 0 ;
+  uint8_t i ;
+
+  
+  for ( i=0 ; i < 8 ; ++i )
+  {
+    digitalWrite( ulClockPin, HIGH ) ;
+
+    if ( ulBitOrder == LSBFIRST )
+    {
+      value |= digitalRead( ulDataPin ) << i ;
+    }
+    else
+    {
+      value |= digitalRead( ulDataPin ) << (7 - i) ;
+    }
+
+    digitalWrite( ulClockPin, LOW ) ;
+  }
+
+  return value ;
+}