Fixed whitespaces, removed some prefixes from variables names

cores/arduino/wiring_analog.c

@@ -53,47 +53,36 @@ static void syncTCC(Tcc* TCCx) {
   while (TCCx->SYNCBUSY.reg & TCC_SYNCBUSY_MASK);
 }
 
-void analogReadResolution( int res )
+void analogReadResolution(int res)
 {
-  _readResolution = res ;
-  if (res > 10)
-  {
+  _readResolution = res;
+  if (res > 10) {
     ADC->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_12BIT_Val;
     _ADCResolution = 12;
-  }
-  else if (res > 8)
-  {
+  } else if (res > 8) {
     ADC->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_10BIT_Val;
     _ADCResolution = 10;
-  }
-  else
-  {
+  } else {
     ADC->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_8BIT_Val;
     _ADCResolution = 8;
   }
   syncADC();
 }
 
-void analogWriteResolution( int res )
+void analogWriteResolution(int res)
 {
-  _writeResolution = res ;
+  _writeResolution = res;
 }
 
-static inline uint32_t mapResolution( uint32_t value, uint32_t from, uint32_t to )
+static inline uint32_t mapResolution(uint32_t value, uint32_t from, uint32_t to)
 {
-  if ( from == to )
-  {
-    return value ;
+  if (from == to) {
+    return value;
   }
-
-  if ( from > to )
-  {
-    return value >> (from-to) ;
-  }
-  else
-  {
-    return value << (to-from) ;
+  if (from > to) {
+    return value >> (from-to);
   }
+  return value << (to-from);
 }
 
 /*
@@ -102,10 +91,10 @@ static inline uint32_t mapResolution( uint32_t value, uint32_t from, uint32_t to
  *
  * Warning : On Arduino Zero board the input/output voltage for SAMD21G18 is 3.3 volts maximum
  */
-void analogReference( eAnalogReference ulMode )
+void analogReference(eAnalogReference mode)
 {
   syncADC();
-  switch ( ulMode )
+  switch (mode)
   {
     case AR_INTERNAL:
     case AR_INTERNAL2V23:
@@ -136,19 +125,17 @@ void analogReference( eAnalogReference ulMode )
   }
 }
 
-uint32_t analogRead( uint32_t ulPin )
+uint32_t analogRead(uint32_t pin)
 {
   uint32_t valueRead = 0;
 
-  if ( ulPin < A0 )
-  {
-    ulPin += A0 ;
+  if (pin < A0) {
+    pin += A0;
   }
 
-  pinPeripheral(ulPin, PIO_ANALOG);
+  pinPeripheral(pin, PIO_ANALOG);
 
-  if (ulPin == A0) // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
-  {
+  if (pin == A0) { // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
     syncDAC();
     DAC->CTRLA.bit.ENABLE = 0x00; // Disable DAC
     //DAC->CTRLB.bit.EOEN = 0x00; // The DAC output is turned off.
@@ -156,7 +143,7 @@ uint32_t analogRead( uint32_t ulPin )
   }
 
   syncADC();
-  ADC->INPUTCTRL.bit.MUXPOS = g_APinDescription[ulPin].ulADCChannelNumber; // Selection for the positive ADC input
+  ADC->INPUTCTRL.bit.MUXPOS = g_APinDescription[pin].ulADCChannelNumber; // Selection for the positive ADC input
 
   // Control A
   /*
@@ -185,7 +172,7 @@ uint32_t analogRead( uint32_t ulPin )
   ADC->SWTRIG.bit.START = 1;
 
   // Store the value
-  while ( ADC->INTFLAG.bit.RESRDY == 0 );   // Waiting for conversion to complete
+  while (ADC->INTFLAG.bit.RESRDY == 0);   // Waiting for conversion to complete
   valueRead = ADC->RESULT.reg;
 
   syncADC();
@@ -200,90 +187,88 @@ uint32_t analogRead( uint32_t ulPin )
 // hardware support.  These are defined in the appropriate
 // pins_*.c file.  For the rest of the pins, we default
 // to digital output.
-void analogWrite( uint32_t ulPin, uint32_t ulValue )
+void analogWrite(uint32_t pin, uint32_t value)
 {
-  uint32_t attr = g_APinDescription[ulPin].ulPinAttribute ;
+  uint32_t attr = g_APinDescription[pin].ulPinAttribute;
 
-  if ( (attr & PIN_ATTR_ANALOG) == PIN_ATTR_ANALOG )
+  if ((attr & PIN_ATTR_ANALOG) == PIN_ATTR_ANALOG)
   {
-    if ( ulPin != PIN_A0 )  // Only 1 DAC on A0 (PA02)
-    {
+    // DAC handling code
+
+    if (pin != PIN_A0) { // Only 1 DAC on A0 (PA02)
       return;
     }
 
-    ulValue = mapResolution(ulValue, _writeResolution, 10);
+    value = mapResolution(value, _writeResolution, 10);
 
     syncDAC();
-    DAC->DATA.reg = ulValue & 0x3FF;  // DAC on 10 bits.
+    DAC->DATA.reg = value & 0x3FF;  // DAC on 10 bits.
     syncDAC();
     DAC->CTRLA.bit.ENABLE = 0x01;     // Enable DAC
     syncDAC();
-    return ;
+    return;
   }
 
-  if ( (attr & PIN_ATTR_PWM) == PIN_ATTR_PWM )
+  if ((attr & PIN_ATTR_PWM) == PIN_ATTR_PWM)
   {
     if (attr & PIN_ATTR_TIMER) {
       #if !(ARDUINO_SAMD_VARIANT_COMPLIANCE >= 10603)
       // Compatibility for cores based on SAMD core <=1.6.2
-      if (g_APinDescription[ulPin].ulPinType == PIO_TIMER_ALT) {
-        pinPeripheral(ulPin, PIO_TIMER_ALT);
+      if (g_APinDescription[pin].ulPinType == PIO_TIMER_ALT) {
+        pinPeripheral(pin, PIO_TIMER_ALT);
       } else
       #endif
       {
-        pinPeripheral(ulPin, PIO_TIMER);
+        pinPeripheral(pin, PIO_TIMER);
       }
     } else {
       // We suppose that attr has PIN_ATTR_TIMER_ALT bit set...
-      pinPeripheral(ulPin, PIO_TIMER_ALT);
+      pinPeripheral(pin, PIO_TIMER_ALT);
     }
 
-    Tc*  TCx  = 0 ;
-    Tcc* TCCx = 0 ;
-    uint8_t Channelx = GetTCChannelNumber( g_APinDescription[ulPin].ulPWMChannel ) ;
-    if ( GetTCNumber( g_APinDescription[ulPin].ulPWMChannel ) >= TCC_INST_NUM )
-    {
-      TCx = (Tc*) GetTC( g_APinDescription[ulPin].ulPWMChannel ) ;
-    }
-    else
-    {
-      TCCx = (Tcc*) GetTC( g_APinDescription[ulPin].ulPWMChannel ) ;
+    Tc*  TCx  = NULL;
+    Tcc* TCCx = NULL;
+    uint8_t Channelx = GetTCChannelNumber(g_APinDescription[pin].ulPWMChannel);
+    if (GetTCNumber(g_APinDescription[pin].ulPWMChannel) >= TCC_INST_NUM) {
+      TCx = (Tc*) GetTC(g_APinDescription[pin].ulPWMChannel);
+    } else {
+      TCCx = (Tcc*) GetTC(g_APinDescription[pin].ulPWMChannel);
     }
 
     // Enable clocks according to TCCx instance to use
-    switch ( GetTCNumber( g_APinDescription[ulPin].ulPWMChannel ) )
+    switch (GetTCNumber(g_APinDescription[pin].ulPWMChannel))
     {
       case 0: // TCC0
       case 1: // TCC1
         // Enable GCLK for TCC0 and TCC1 (timer counter input clock)
-        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID( GCM_TCC0_TCC1 )) ;
-      break ;
+        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TCC0_TCC1));
+        break;
 
       case 2: // TCC2
       case 3: // TC3
         // Enable GCLK for TCC2 and TC3 (timer counter input clock)
-        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID( GCM_TCC2_TC3 )) ;
-      break ;
+        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TCC2_TC3));
+        break;
 
       case 4: // TC4
       case 5: // TC5
         // Enable GCLK for TC4 and TC5 (timer counter input clock)
-        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID( GCM_TC4_TC5 ));
-      break ;
+        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TC4_TC5));
+        break;
 
       case 6: // TC6 (not available on Zero)
       case 7: // TC7 (not available on Zero)
         // Enable GCLK for TC6 and TC7 (timer counter input clock)
-        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID( GCM_TC6_TC7 ));
-      break ;
+        GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TC6_TC7));
+        break;
     }
 
-    while ( GCLK->STATUS.bit.SYNCBUSY == 1 ) ;
+    while (GCLK->STATUS.bit.SYNCBUSY == 1);
 
-    ulValue = mapResolution(ulValue, _writeResolution, 8);
+    value = mapResolution(value, _writeResolution, 8);
 
     // Set PORT
-    if ( TCx )
+    if (TCx)
     {
       // -- Configure TC
 
@@ -295,7 +280,7 @@ void analogWrite( uint32_t ulPin, uint32_t ulValue )
       // Set TCx as normal PWM
       TCx->COUNT8.CTRLA.reg |= TC_CTRLA_WAVEGEN_NPWM;
       // Set TCx in waveform mode Normal PWM
-      TCx->COUNT8.CC[Channelx].reg = (uint8_t) ulValue;
+      TCx->COUNT8.CC[Channelx].reg = (uint8_t) value;
       syncTC_8(TCx);
       // Set PER to maximum counter value (resolution : 0xFF)
       TCx->COUNT8.PER.reg = 0xFF;
@@ -314,29 +299,26 @@ void analogWrite( uint32_t ulPin, uint32_t ulValue )
       TCCx->WAVE.reg |= TCC_WAVE_WAVEGEN_NPWM;
       syncTCC(TCCx);
       // Set TCx in waveform mode Normal PWM
-      TCCx->CC[Channelx].reg = (uint32_t)ulValue;
+      TCCx->CC[Channelx].reg = (uint32_t)value;
       syncTCC(TCCx);
       // Set PER to maximum counter value (resolution : 0xFF)
       TCCx->PER.reg = 0xFF;
       syncTCC(TCCx);
       // Enable TCCx
-      TCCx->CTRLA.reg |= TCC_CTRLA_ENABLE ;
+      TCCx->CTRLA.reg |= TCC_CTRLA_ENABLE;
       syncTCC(TCCx);
     }
 
-    return ;
+    return;
   }
 
   // -- Defaults to digital write
-  pinMode( ulPin, OUTPUT ) ;
-  ulValue = mapResolution(ulValue, _writeResolution, 8);
-  if ( ulValue < 128 )
-  {
-    digitalWrite( ulPin, LOW ) ;
-  }
-  else
-  {
-    digitalWrite( ulPin, HIGH ) ;
+  pinMode(pin, OUTPUT);
+  value = mapResolution(value, _writeResolution, 8);
+  if (value < 128) {
+    digitalWrite(pin, LOW);
+  } else {
+    digitalWrite(pin, HIGH);
   }
 }