Hardware requirements

  • Mini/micro USB cable

  • MCX-N5XX-EVK Board

  • Personal Computer

Board settings

Pin Name    Board Location     checker channel number       pre-set value            trigger        
P1_0            J2-17                channel 0                    0              input < DAC output
P4_2            J1-4                 channel 4                    1              input > DAC output
P4_3            J1-2                 channel 5                    0              input < DAC output

This example uses LPCMP0 instance, the fixed port is plusMuxPort, the fixed channel is channel 7(Internal DAC module), and the checker channels are channel 0(CMP0_IN0, P1_0, J2-17), channel 4(CMP0_IN1, P4_2, J1-4) and channel 5(CMP0_IN2, P4_3, J1-2), in miusMuxPort. The LPCMP’s internal DAC module output voltage signal(half of VREFI), the channel’s pre-set value is 0x10U.

Set the input voltage of channel 0, channel 4 and channel 5 to be less than, greater than and less than the output voltage of the DAC respectively. The comparison results of the three channels are different from the pre-set value. So the interrupt occurred and the terminal will print corresponding channel changed information.

Prepare the Demo

  1. Connect the micro and mini USB cable between the PC host and the USB ports on the board.

  2. Open a serial terminal on PC for the serial device with these settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. 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, following information can be seen on the OpenSDA terminal:

LPCMP RoundRobin Example.
channel 0 comparison result is different from preset value!
channel 4 comparison result is different from preset value!
channel 5 comparison result is different from preset value!