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dsc_adc16_continuous_dma

dsc_adc16_continuous_dma#

Overview#

The ADC16 continuous DMA demo application demonstrates the usage of the ADC and DMA peripheral while in a continuous mode. The ADC16 is first set to continuous mode. In continuous convert configuration, only the initial rising-edge to launch continuous conversions is observed, and until conversion is aborted, the ADC16 continues to do conversions on the same SCn register that initiated the conversion. DMA request will be asserted during an ADC16 conversion complete event noted when any of the SC1n[COCO] flags is asserted. DMA will transfer ADC16 results to memory and if users press any key, demo will average ADC16 results stored in memory and print average on the terminal.

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

  • Supply external voltage(0~3.3V) to J503-3.

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

When the example runs successfully, the following message is displayed in the terminal:

ADC16 CONTINUOUS DMA DEMO
ADC16_DoAutoCalibration() Done.
ADC Full Range: 65536
Press any key to get user channel's ADC value ...
ADC value: 29695
ADC value: 24027
ADC value: 23636
...
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