/**
    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
    MISO  <-->  PB14 <-->  BOARD_SPI2_MISO_PIN
    MOSI  <-->  PB15 <-->  BOARD_SPI2_MOSI_PIN
*/


#include <SPI.h>

#define SPI1_NSS_PIN PA4    //SPI_1 Chip Select pin is PA4. You can change it to the STM32 pin you want.

const byte WRITE_CMD = 0b01110000;
const byte WRITE_DTA = 0b01110010;
const byte READ_DATA = 0b01110011;

const byte ZEROES  = 0x00;
const byte ADDRESS = 0xB0; //0b10110000

unsigned int receivedVal = 0;

byte data;

void setup() {

  Serial.begin(115200);
  Serial.println("--------------");
  // Setup SPI 1
  SPI.begin(); //Initialize the SPI_1 port.
  SPI.setBitOrder(MSBFIRST); // Set the SPI_1 bit order
  SPI.setDataMode(SPI_MODE3); //Set the  SPI_2 data mode 0
  SPI.setClockDivider(SPI_CLOCK_DIV128);      // Slow speed (72 / 16 = 4.5 MHz SPI_1 speed)
  pinMode(SPI1_NSS_PIN, OUTPUT);


}

void loop() {

  ssd_send_control();
  ssd_read();

  delayMicroseconds(5);
}

void ssd_send_control()
{
  digitalWrite(SPI1_NSS_PIN, LOW);
  const uint8 buf[3] = {WRITE_CMD,0x00,ADDRESS};
  uint32 bufSize = 3;
  SPI.write(buf, bufSize);
  digitalWrite(SPI1_NSS_PIN, HIGH);
}

void ssd_read()
{
  digitalWrite(SPI1_NSS_PIN, LOW);
  SPI.transfer(READ_DATA);
  uint8 ReadBuf[3];
  uint32 bufSize = 3;
  SPI.read(ReadBuf, bufSize);
  digitalWrite(SPI1_NSS_PIN, HIGH);
}