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dsc_pdb_adc16_trigger

dsc_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#

TWR-MC56F8400
Hardware requirements

  • Mini USB cable

  • TWR-MC56F8400 board

  • Personal Computer

Board hardware common setting

  1. Power setting:

    Connect J11 pin1 and pin2 Connect J6 pin1 and J7 pin2

  2. UART setting:

    Connect J8 pin3 and pin4 Connect J9 pin3 and pin4

  3. Onboard OSJTAG debugger setting:

    Connect J20 pin1 and pin2. Leave J17 open. Note: J17 is only used(connected) when firmware update for onboard debugger OSJTAG. Connect J21 pin 1-2, 3-4, 5-6, 7-8, to setup onboard debugger OSJTAG. Note: when use external debugger(connected to J14), leave all J21 pins open

Board settings

No special settings are required.

Prepare the Demo

  1. Connect USB cable between the host PC and the JM60 USB(J18) port on the target board. It setups OSJTAG and COM port in PC device manager.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board with OSJTAG debug configuration.

  4. Launch the debugger in your IDE to begin running the demo.

Running the demo

The log below shows the output of the hello world demo in the terminal window:

PDB ADC16 Trigger Example.
ADC16_DoAutoCalibration() Done.
ADC Full Range: 4096

Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Delay Interrupt Counter: 1
ADC Interrupt Count: 1
ADC Value: 3714

Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Delay Interrupt Counter: 2
ADC Interrupt Count: 2
ADC Value: 3717

Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Delay Interrupt Counter: 3
ADC Interrupt Count: 3
ADC Value: 3731

Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Delay Interrupt Counter: 4
ADC Interrupt Count: 4
ADC Value: 3723

Type any key into terminal to trigger the PDB and then trigger the ADC's conversion ...
PDB Delay Interrupt Counter: 5
ADC Interrupt Count: 5
ADC Value: 3729

...
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