Overview
========

The dac_buffer_interrupt example shows how to use DAC buffer with interrupts.

When the DAC's buffer feature is enabled, user can benefit from the automation of updating DAC output by hardware/
software trigger. As we know, the DAC converter outputs the value of item pointed by current read pointer. Once the 
buffer is triggered by software or hardware, the buffer's read pointer would move automatically as the work mode is set,
like normal (cycle) mode, swing mode, one-time-scan mode or FIFO mode.

In this example, it captures the user's type-in operation from terminal and does the software trigger to the buffer.
The terminal would also display the log that shows the current buffer pointer's position with buffer events.

Toolchain supported
===================
- IAR embedded Workbench 7.50.1
- Keil MDK 5.17
- GCC ARM Embedded 2015-4.9-q3
- Kinetis Development Studio IDE 3.0.0
- Atollic TrueSTUDIO 5.4.0

Hardware requirements
=====================
- Mini/Micro USB cable
- TWR-KL43Z48 board
- Personal Computer

Board settings
==============
No special is needed.

Prepare the Demo
================
1.  Connect a USB cable between the PC host and the OpenSDA USB port on the board.
2.  Open a serial terminal on PC for OpenSDA serial device with these settings:
    - 115200 baud rate
    - 8 data bits
    - No parity
    - One stop bit
    - No flow control
3.  Download the program to the target board.
4.  Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
5.  A multimeter may be used to measure the DAC output voltage.

Running the demo
================
When the demo runs successfully, the log would be seen on the OpenSDA terminal like:
DAC buffer interrupt Example.
DAC Buffer Information
          Buffer index max  : 1
Press any key in terminal to trigger the buffer ...
Buffer Index  0: ReadPointerTopPositionEvent
Buffer Index  1: ReadPointerBottomPositionEvent
User can take a look at how the pointer is moved by triggered, then user can also measure the DAC output
pin to check responding voltage.

Customization options
=====================


