From ee6cf1331610635886be1fe55257ad8b7d77af22 Mon Sep 17 00:00:00 2001
From: jiamin <51077771+hbcz2019@users.noreply.github.com>
Date: Tue, 28 May 2019 21:29:27 +0800
Subject: [PATCH] Code comment

Code comment
---
 .../Arduino_1.0.x/libraries/SPI/SPI.cpp       | 36 ++++++++++---------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/ArduinoAddons/Arduino_1.0.x/libraries/SPI/SPI.cpp b/ArduinoAddons/Arduino_1.0.x/libraries/SPI/SPI.cpp
index 5e48073..54cb36a 100644
--- a/ArduinoAddons/Arduino_1.0.x/libraries/SPI/SPI.cpp
+++ b/ArduinoAddons/Arduino_1.0.x/libraries/SPI/SPI.cpp
@@ -15,40 +15,44 @@ SPIClass SPI;
 
 void SPIClass::begin() {
 
-  // Set SS to high so a connected chip will be "deselected" by default
+  /* Set SS to high so a connected chip will be "deselected" by default*/
   digitalWrite(SS, HIGH);
 
-  // When the SS pin is set as OUTPUT, it can be used as
-  // a general purpose output port (it doesn't influence
-  // SPI operations).
+  /* When the SS pin is set as OUTPUT, it can be used as
+   a general purpose output port (it doesn't influence
+   SPI operations).*/
   pinMode(SS, OUTPUT);
 
-  // Warning: if the SS pin ever becomes a LOW INPUT then SPI
-  // automatically switches to Slave, so the data direction of
-  // the SS pin MUST be kept as OUTPUT.
+  /* Warning: if the SS pin ever becomes a LOW INPUT then SPI
+     automatically switches to Slave, so the data direction of
+     the SS pin MUST be kept as OUTPUT.*/
   SPCR |= _BV(MSTR);
   SPCR |= _BV(SPE);
 
-  // Set direction register for SCK and MOSI pin.
-  // MISO pin automatically overrides to INPUT.
-  // By doing this AFTER enabling SPI, we avoid accidentally
-  // clocking in a single bit since the lines go directly
-  // from "input" to SPI control.  
-  // http://code.google.com/p/arduino/issues/detail?id=888
+  /* Set direction register for SCK and MOSI pin.
+     MISO pin automatically overrides to INPUT.
+     By doing this AFTER enabling SPI, we avoid accidentally
+     clocking in a single bit since the lines go directly
+     from "input" to SPI control.  
+     http://code.google.com/p/arduino/issues/detail?id=888*/
   pinMode(SCK, OUTPUT);
   pinMode(MOSI, OUTPUT);
 }
 
 
-void SPIClass::end() {
+void SPIClass::end() 
+{
   SPCR &= ~_BV(SPE);
 }
 
 void SPIClass::setBitOrder(uint8_t bitOrder)
 {
-  if(bitOrder == LSBFIRST) {
+  if(bitOrder == LSBFIRST) 
+  {
     SPCR |= _BV(DORD);
-  } else {
+  } 
+  else 
+  {
     SPCR &= ~(_BV(DORD));
   }
 }