capt_acomp_continuous#
Overview#
This example shows how to capture touch data using CAPT continuous mode. Comparing with the capt_basic_continuous example, this example uses ACOMP instead of GPIO in measurement period. CAP polls and samples the touch pad data round by round, in each round, all the enabled pins are sampled one by one. To monitor one pad sample finished, both the yes_touch and no_touch interrupt is enabled. The poll done interrupt is enabled to monitor the poll round finished. The delay period between two polling round is configurable, in this example, the delay period is set to about 0.5s. When the example runs, the sampled data is shown in the terminal, and update every about 0.5s. When electrode plate is touched, the sampled data changes too.
Supported Boards#
LPC845BREAKOUT
Hardware requirements
Micro USB cable
LPC845 Breakout board
Personal Computer
Board settings
Make sure R23 is on the LPC845 Breakout board.
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 CAPT sample data is shown in the terminal, touch the electrode plate to see sample data change.
LPCXpresso804
Toolchain supported
IAR embedded Workbench 8.22.1
Keil MDK 5.24a
MCUXpresso10.2.0
Hardware requirements
Micro USB cable
LPCXpresso804 board
CapTouch Shield board
Personal Computer
Board settings
Remove JP3, JP21, JP22, JP23, JP25 and C13 on LPCXpresso804 board. Short R6 on CapTouch Shield board
Prepare the Demo
Connect a micro USB cable between the host PC and the CMSIS DAP USB port (CN2) 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 CAPT sample data is shown in the terminal, touch the electrode plate to see sample data change.