Overview
========
The lpc_spi_half_duplex_int_transfer_master example shows how to use driver API to transfer in half-duplex way.  

In this example, one spi instance as master and another spi instance on the other board as slave. Master 
sends a piece of data to slave, and receive a piece of data from slave. This example checks if the data 
received from slave is correct.
Besides, master will transfer data in interrupt way. 

Toolchain supported
===================
- IAR embedded Workbench  8.32.3
- Keil MDK  5.27
- MCUXpresso  11.0.0
- GCC ARM Embedded  8.2.1

Hardware requirements
=====================
- Micro USB cable
- Two LPCXpresso54102 boards
- Personal Computer

Board settings
==============
Connect SPI master on board to SPI slave on other board
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Master - SPI0                  Slave - SPI0   
Pin Name   Board Location      Pin Name   Board Location            
MISO       J3 pin 3            MISO       J3 pin 3                     
MOSI       J3 pin 2            MOSI       J3 pin 2                
SCK        J3 pin 4            SCK        J3 pin 4                 
SSEL0      J3 pin 1            SSEL0      J3 pin 1
GND        J3 pin 5            GND        J3 pin 5
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Prepare the Demo
================
1.  Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J6) on the board
2.  Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
    - 115200 baud rate
    - 8 data bits
    - No parity
    - One stop bit
    - No flow control
3.  Download the program to the target board.
4.  Reset the SoC and run the project.

Running the demo
================
When the demo runs successfully, the log would be seen on the CMSIS DAP terminal like:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is SPI half-duplex interrupt transfer example!
SPI master board will transmit data to slave board first, then receive data from slave board.
To make sure the transfer work successfully, please start the slave board first!
Master will use interrupt way, and slave will use interrupt way too.

Master start to tansfer data...
The half-duplex transfer in interrupt way is end!

The received data are:
      0x00  0x01  0x02  0x03  0x04  0x05  0x06  0x07  0x08  0x09  0x0A  0x0B  0x0C  0x0D  0x0E  0x0F
      0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17  0x18  0x19  0x1A  0x1B  0x1C  0x1D  0x1E  0x1F
      0x20  0x21  0x22  0x23  0x24  0x25  0x26  0x27  0x28  0x29  0x2A  0x2B  0x2C  0x2D  0x2E  0x2F
      0x30  0x31  0x32  0x33  0x34  0x35  0x36  0x37  0x38  0x39  0x3A  0x3B  0x3C  0x3D  0x3E  0x3F
Master half-duplex interrupt transfer succeed!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Customization options
=====================

