cadc_continuous_dma_conversion#
Overview#
The CADC continuous DMA demo application demonstrates the usage of the ADC and DMA peripheral while in a Loop Sequential mode. The CADC is first set to Loop Sequential mode. In Loop Sequential convert configuration, only the initial rising-edge to launch continuous conversions is observed, and until conversion is aborted, the CADC continues to do conversions on the same CLIST register that initiated the conversion. DMA request will be asserted during an CADC conversion READY event noted when any of the ADC_RDY[RDYn] flags is asserted. DMA will transfer CADC results to memory and if users press any key, demo will average CADC results stored in memory and print average on the terminal.
Supported Boards#
TWR-MC56F8200
Hardware requirements
Mini USB cable
TWR-MC56F8200 board
Personal Computer
Board hardware common setting
HW reworkd(workaround):
Connect J18(the mini USB port) pin4 and pin5. Note: This is due to HW design error, correct setting should be: J18 pin4 left empty and pin5 connected GND.
Power setting:
Connect J11 pin1 and pin2 Connect J6 pin1 and J7 pin2
UART setting:
Connect J8 pin3 and pin4 Connect J9 pin3 and pin4
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
Connect J23 with jumper, 1-2, 3-4.
Note: The sample0(thermistor 4) works in fully differential mode and the differential pair is selected as ANA4 and ANA5.
Prepare the Demo
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.
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 with OSJTAG debug configuration.
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:
CADC continuous dma conversion.
Press any key to trigger the conversion ...
CADC continuous dma conversion. Press any key to get user channel’s ADC value … ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122
User can press any key to get more converter data. The ADC input channel is connected with thermistor,
so touching thermistor on board will get the ADC value updated.
TWR-MC56F8400
Hardware requirements
Mini USB cable
TWR-MC56F8400 board
Personal Computer
Board hardware common setting
Power setting:
Connect J11 pin1 and pin2 Connect J6 pin1 and J7 pin2
UART setting:
Connect J8 pin3 and pin4 Connect J9 pin3 and pin4
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
Connect J23 with jumper, 1-2, 3-4.
Note: The sample0(thermistor 4) works in fully differential mode and the differential pair is selected as ANA4 and ANA5.
Prepare the Demo
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.
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 with OSJTAG debug configuration.
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:
CADC continuous dma conversion.
Press any key to trigger the conversion ...
CADC continuous dma conversion. Press any key to get user channel’s ADC value … ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122 ADC value: 3122
User can press any key to get more converter data. The ADC input channel is connected with thermistor,
so touching thermistor on board will get the ADC value updated.