pdb_adc16_trigger#
Overview#
The pdb_adc16_trigger example shows how to use the PDB to generate a ADC trigger.
Based on the basic counter, to use the ADC trigger, just to enable the ADC trigger’s “milestone” and set the user- defined value for it. After the PDB counter is triggered to start, when the counter pass the “milestone”, the ADC’s Pre-Trigger would be generated and sent to the ADC module.
In this example, the ADC16 is configured with hardware trigger and conversion complete interrupt enabled. Once it gets the trigger from the PDB, the conversion goes, then the ISR would be executed.
Supported Boards#
FRDM-K22F
Hardware requirements
Mini/Micro USB cable
FRDM-K22F board
Personal Computer
Board settings
No special is needed.
Prepare the Demo
Connect a USB cable between the PC host and the OpenSDA USB port on the board.
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
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the OpenSDA terminal like:
PDB ADC16 Pre-Trigger Example. ADC Full Range: XXXX Type any key into terminal to trigger the PDB and then trigger the ADC’s conversion …
PDB Interrupt Counter: 1 ADC Conversion Interrupt Counter: 1
Type any key into terminal to trigger the PDB and then trigger the ADC’s conversion …
PDB Interrupt Counter: 2 ADC Conversion Interrupt Counter: 2
TWR-KM34Z75M
Hardware requirements
Mini USB cable
TWR-KM34Z75M board
Personal Computer
Board settings
Connect J21 1-2 to use potentiometer
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
Roll the potentiometer to change the ADC value. When the example runs successfully, the following message is displayed in the terminal:
PDB ADC16 Pre-Trigger Example.
Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Interrupt Counter: 1
ADC Conversion Interrupt Counter: 1
ADC Conversion Value: 4095
................
................
TWR-KM35Z75M
Hardware requirements
Micro USB cable
TWR-KM35Z75M board
Personal Computer
Board settings
Connect J21 1-2 to use potentiometer
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
Roll the potentiometer to change the ADC value. When the example runs successfully, the following message is displayed in the terminal:
PDB ADC16 Pre-Trigger Example.
Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Interrupt Counter: 1
ADC Conversion Interrupt Counter: 1
ADC Conversion Value: 4095
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