dsc_dac_ext_triggered_waveform#
Overview#
The dsc_dac_ext_triggered_waveform example shows how to use the DAC module as the waveform generator.
This driver example works in synchronous mode, it means that SYNC_IN signal should be configured to update the buffered registers. So an external input clock is needed in this demo. When the users use this driver example to generate the waveform, please provide a 1 kHz external clock signal, and the data in buffered data register can be refreshed every cycle. Then the sawtooh waveform can be measured on DAC output pin.
Supported Boards#
TWR-MC56F8200
Hardware requirements
Mini USB cable
TWR-MC56F8200 board
Personal Computer
Oscilloscope
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
Input 1KHz clock(0-3.3V) to J502-12.
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 demo runs successfully, the log would be seen on the terminal like:
DAC waveform generator Example.
Please input a 1 kHz external clock signal.
A 10Hz sawtooth waveform can be viewed on the Oscilloscope.
Then the desired waveform will be output from DACA output pin. Use an oscilloscope to measure the voltage of J502-14, then you will see the sawtooh waveform with 10Hz frequency.
TWR-MC56F8400
Hardware requirements
Mini USB cable
TWR-MC56F8400 board
Personal Computer
Oscilloscope
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
Input 1KHz clock(0-3.3V) to J502-12.
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 demo runs successfully, the log would be seen on the terminal like:
DAC waveform generator Example.
Please input a 1 kHz external clock signal.
A 10Hz sawtooth waveform can be viewed on the Oscilloscope.
Then the desired waveform will be output from DACA output pin. Use an oscilloscope to measure the voltage of J502-14, then you will see the sawtooh waveform with 10Hz frequency.