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    Release notes for ADC demo TWR-K20D72M kinetis family

    Freescale Semiconductor February 2012   

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Demo code runs on the TWR-K20D72M module.

The following code demonstrates the hardware trigger capability of the ADC.

There are two trigger signals generated from the PDB hardware.

The ADC has a set of A registers and a set of B registers
for those items that benefit from ping-ponging (double buffering),
so that while one is in use, the other set can be used.

Both ADC channels A and B are reading the voltage of the POT and they are showed on the terminal.

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Basic Setup
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TWR-K20D72M setup
Use default jumper setting for board.

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Demo explanation
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1. Download the code to MCU. Make sure to disconnect the debugger by stopping debugging.

2. Disconnect and connect the USB cable of the Tower board.

2. Open the P&E Micro Terminal Utility and connect the USB COM at 115200 bps with no parity and 8 bit size.

3. Reset the board. A prompt will appear showing reset information. 

4. Two LEDs will be toggling, the blue one toggle every time the PDB's counter is started, and the green one is ON every time the conversion of the ADC_CHA is finished and it is OFF, when the ADC_CHB is finished.

5. Vary the POT and see the value on the terminal.

6: The demo is finished by pressing any key.

