acomp_interrupt#
Overview#
The ACOMP Interrupt Example shows how to use interrupt with ACOMP driver.
In this example, user should indicate an input channel to capture a voltage signal (can be controlled by user) as the ACOMP’s negative channel input. On the postive side, the internal voltage ladder is used to generate the fixed voltage about half value of reference voltage.
When running the project, change the input voltage of user-defined channel, then the comparator’s output would change between logic one and zero when the user-defined channel’s voltage crosses the internal ladder’s output. The change of comparator’s output would generate the falling and rising edge events with their interrupts enabled. When any ACOMP interrupt happens, the ACOMP’s ISR would turn on/off the LED light.
Supported Boards#
LPC845BREAKOUT
Hardware requirements
Micro USB cable
LPC845 Breakout board
Personal Computer
Board settings
PIO0_14 is ACOMP negative input pin, which can sample external voltage.
Prepare the demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port on the board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
The log below shows the output of the ACOMP interrupt driver example in the terminal window:
LPC_ACOMP Interrupt Example.
The example compares analog input to the voltage ladder output(ACOMP negative port).
The LED will be turned ON/OFF when the analog input is LOWER/HIGHER than the ladder's output.
Change the analog input voltage to see the LED status.
LPCXpresso802
Toolchain supported
IAR embedded Workbench 8.11.3
Keil MDK 5.23
MCUXpresso10.1.0
Hardware requirements
Micro USB cable
LPCXpresso54608 board
Personal Computer
Board settings
CN3-20 is ACOMP negative input pin, which can sample external voltage.
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or 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:
LPC_ACOMP Interrupt Example.
The example compares analog input to the voltage ladder output(ACOMP negative port).
The LED will be turned ON/OFF when the analog input is LOWER/HIGHER than the ladder's output.
Change the analog input voltage to see the LED status.
Customization options
LPCXpresso804
Toolchain supported
IAR embedded Workbench 8.22.1
Keil MDK 5.24a
MCUXpresso10.2.0
Hardware requirements
Micro USB cable
LPCXpresso804 board
Personal Computer
Board settings
CN5 pin6 is ACOMP negative input pin, which can sample external voltage.
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or 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:
LPC_ACOMP Interrupt Example.
The example compares analog input to the voltage ladder output(ACOMP negative port).
The LED will be turned ON/OFF when the analog input is LOWER/HIGHER than the ladder's output.
Change the analog input voltage to see the LED status.
Customization options
LPCXpresso824MAX
Toolchain supported
IAR embedded Workbench 8.11.3
Keil MDK 5.23
MCUXpresso10.1.0
Hardware requirements
Micro USB cable
LPCXpresso824MAX board
Personal Computer
Board settings
J6-1 is ACOMP negative input pin, which can sample external voltage.
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or 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:
LPC_ACOMP Interrupt Example.
The example compares analog input to the voltage ladder output(ACOMP negative port).
The LED will be turned ON/OFF when the analog input is LOWER/HIGHER than the ladder's output.
Change the analog input voltage to see the LED status.
Customization options
LPCXpresso845MAX
Toolchain supported
IAR embedded Workbench 8.11.3
Keil MDK 5.23
MCUXpresso10.1.0
Hardware requirements
Micro USB cable
LPCXpresso54608 board
Personal Computer
Board settings
J6-1 is ACOMP negative input pin, which can sample external voltage.
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or 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:
LPC_ACOMP Interrupt Example.
The example compares analog input to the voltage ladder output(ACOMP negative port).
The LED will be turned ON/OFF when the analog input is LOWER/HIGHER than the ladder's output.
Change the analog input voltage to see the LED status.
Customization options
LPCXpresso860MAX
Toolchain supported
IAR embedded Workbench 8.11.3
Keil MDK 5.23
MCUXpresso10.1.0
Hardware requirements
Micro USB cable
LPCXpresso860MAX board
Personal Computer
Board settings
J6-8 is ACOMP negative input pin, which can sample external voltage.
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J4) on the target board.
Open a serial terminal with the following settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
If the ACOMP input pin(J6-8) connects the GND, LED(D1) will be turned on. If the ACOMP input pin(J6-8) connects the 3.3V, LED(D1) will be turned off.