improved vasillis's SPI 2 demo

Author: rogerclarkmelbourne

STM32F1/libraries/SPI/examples/using_SPI_ports/using_SPI_ports.ino

@@ -1,22 +1,22 @@
 /**
     SPI_1 and SPI_2 port example code
-    
+
     Description:
     This sketch sends one byte with value 0x55 over the SPI_1 or SPI_2 port.
     The received byte (the answer from the SPI slave device) is stored to the <data> variable.
-    
+
     The sketch as it is, works with SPI_1 port. For using the SPI_2 port, just
     un-comment all the nessesary code lines marked with <SPI_2> word.
-    
+
     Created on 10 Jun 2015 by Vassilis Serasidis
     email:  avrsite@yahoo.gr
-    
+
     Using the first SPI port (SPI_1)
     SS    <-->  PA4 <-->  BOARD_SPI1_NSS_PIN
     SCK   <-->  PA5 <-->  BOARD_SPI1_SCK_PIN
     MISO  <-->  PA6 <-->  BOARD_SPI1_MISO_PIN
     MOSI  <-->  PA7 <-->  BOARD_SPI1_MOSI_PIN
-    
+
     Using the second SPI port (SPI_2)
     SS    <-->  PB12 <-->  BOARD_SPI2_NSS_PIN
     SCK   <-->  PB13 <-->  BOARD_SPI2_SCK_PIN
@@ -30,35 +30,47 @@
 #define SPI1_NSS_PIN PA4    //SPI_1 Chip Select pin is PA4. You can change it to the STM32 pin you want.
 #define SPI2_NSS_PIN PB12   //SPI_2 Chip Select pin is PB12. You can change it to the STM32 pin you want.
 
-//SPIClass SPI_2(2); //un-comment this line in case you want to use the SPI_2 port. 
+SPIClass SPI_2(2); //Create an instance of the SPI Class called SPI_2 that uses the 2nd SPI Port
 byte data;
 
 void setup() {
+
+  // Setup SPI 1
   SPI.begin(); //Initialize the SPI_1 port.
-  //SPI_2.begin(); //Initialize the SPI_2 port.
-  
   SPI.setBitOrder(MSBFIRST); // Set the SPI_1 bit order
-  //SPI_2.setBitOrder(MSBFIRST); // Set the SPI_2 bit order
-  
   SPI.setDataMode(SPI_MODE0); //Set the  SPI_2 data mode 0
-  //SPI_2.setDataMode(SPI_MODE0); //Set the  SPI_2 data mode 0
-  
   SPI.setClockDivider(SPI_CLOCK_DIV16);      // Slow speed (72 / 16 = 4.5 MHz SPI_1 speed)
-  //SPI_2.setClockDivider(SPI_CLOCK_DIV16);  // Slow speed (72 / 16 = 4.5 MHz SPI_2 speed) 
+  pinMode(SPI1_NSS_PIN, OUTPUT);
+
+  // Setup SPI 2
+  SPI_2.begin(); //Initialize the SPI_2 port.
+  SPI_2.setBitOrder(MSBFIRST); // Set the SPI_2 bit order
+  SPI_2.setDataMode(SPI_MODE0); //Set the  SPI_2 data mode 0
+  SPI_2.setClockDivider(SPI_CLOCK_DIV16);  // Use a different speed to SPI 1
+  pinMode(SPI2_NSS_PIN, OUTPUT);
+
 
-  pinMode(SPI1_NSS_PIN, OUTPUT); // note: this must be after the SPI.begin() for gpio control of CSN
-  //pinMode(SPI2_NSS_PIN, OUTPUT); // note: this must be after the SPI_2.begin() for gpio control of CSN
 }
 
 void loop() {
+
+  sendSPI();
+  sendSPI2();
+
+  delayMicroseconds(10);    //Delay 10 micro seconds.
+}
+
+void sendSPI()
+{
   digitalWrite(SPI1_NSS_PIN, LOW); // manually take CSN low for SPI_1 transmission
-  //digitalWrite(SPI2_NSS_PIN, LOW); // manually take CSN low for SPI_2 transmission
-  
   data = SPI.transfer(0x55); //Send the HEX data 0x55 over SPI-1 port and store the received byte to the <data> variable.
-  //data = SPI_2.transfer(0x55); //Send the HEX data 0x55 over SPI-2 port and store the received byte to the <data> variable.
-  
   digitalWrite(SPI1_NSS_PIN, HIGH); // manually take CSN high between spi transmissions
-  //digitalWrite(SPI2_NSS_PIN, HIGH); // manually take CSN high between spi transmissions
-
-  delayMicroseconds(10);    //Delay 10 micro seconds.
 }
+
+
+void sendSPI2()
+{
+  digitalWrite(SPI2_NSS_PIN, LOW); // manually take CSN low for SPI_2 transmission
+  data = SPI_2.transfer(0x55); //Send the HEX data 0x55 over SPI-2 port and store the received byte to the <data> variable.
+  digitalWrite(SPI2_NSS_PIN, HIGH); // manually take CSN high between spi transmissions
+}