STM32F103C8T6 SPI

SPI1
NSS PA4
SCK PA5
MISO PA6
MOSI PA7

SPI2
NSS PB12
SCK PB13
MISO PB14
MOSI PB15

#include <SPI.h>
SPIClass SPI_2(2);
SPI_2.begin();
SPI_2.setBitOrder(MSBFIRST); // http://www.arduino.cc/en/Reference/SPISetBitOrder
SPI_2.setDataMode(SPI_MODE0); // http://www.arduino.cc/en/Reference/SPISetDataMode
SPI_2.setClockDivider(SPI_CLOCK_DIV16);     // Slow speed (72 / 16 = 4.5 MHz SPI speed)
byte data = SPI_2.transfer(0x55); //Send and get