lpadc_dma#
Overview#
The lpadc_dma example shows how to use ADC to trigger a DMA transfer.
In this example, user should indicate a channel to provide a voltage signal (can be controlled by user) as the LPADC’s sample input. When running the project, typing any key into debug console would trigger the conversion, the software trigger API is called to start the conversion. When the ADC conversion is completed, it would trigger the DMA in ping-pong transfer mode to move the ADC conversion result from ADC conversion data register to user indicated memory. Then the main loop waits for the transfer to be done and print the latest ADC conversion word and ADC conversion value average to terminal.
Supported Boards#
EVK-MIMXRT595
Hardware requirements
Micro USB cable
EVK-MIMXRT595 board
Personal Computer
Board settings
Input voltage signal(0~1.8V) to J30-1(LPADC0 CH0).
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J40) on the board
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.
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 terminal:
LPADC DMA Example
ADC Full Range: 4096
Full channel scale (Factor of 1).
Please press any key to trigger the conversion.
Adc conversion word : 0x81006148
ADC conversion value: 3113
Adc conversion word : 0x81006140
ADC conversion value: 3112
Adc conversion word : 0x81006140
ADC conversion value: 3112
EVK-MIMXRT685
Hardware requirements
Micro USB cable
EVK-MIMXRT685 board
Personal Computer
Board settings
Set VREF_L to GND, VREF_H to 1.8V (connect JP9, JP10).
Input voltage signal(0~1.8V) to J30-1(LPADC0 CH0).
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board
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.
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 terminal:
LPADC DMA Example
ADC Full Range: 4096
Full channel scale (Factor of 1).
Please press any key to trigger the conversion.
Adc conversion word : 0x81006148
ADC conversion value: 3113
Adc conversion word : 0x81006140
ADC conversion value: 3112
Adc conversion word : 0x81006140
ADC conversion value: 3112
LPCXpresso55S06
Hardware requirements
Mini/micro USB cable
LPCXpresso55S06 board
Personal Computer
Board settings
ADC CH0A input signal J13-3(PIO0_23).
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J1) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 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 lpadc dma example in the terminal window:
LPADC DMA Example
ADC Full Range: 65536
Please press any key to trigger the conversion.
Adc conversion word : 0x81008BA1
ADC conversion value: 35745
Adc conversion word : 0x81008BE7
ADC conversion value: 35815
Adc conversion word : 0x81008B14
ADC conversion value: 35604
LPCXpresso55S16
Hardware requirements
Mini/micro USB cable
LPCXpresso55s16 board
Personal Computer
Board settings
ADC CH0A input signal J13-3(PIO0_23). The jumper setting: Default jumpers configuration does not work, you will need to add JP20 and JP21 (JP22 optional for ADC use)
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J1) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 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 lpadc dma example in the terminal window:
LPADC DMA Example
ADC Full Range: 65536
Please press any key to trigger the conversion.
Adc conversion word : 0x81008BA1
ADC conversion value: 35745
Adc conversion word : 0x81008BE7
ADC conversion value: 35815
Adc conversion word : 0x81008B14
ADC conversion value: 35604
LPCXpresso55S36
Hardware requirements
Mini/micro USB cable
LPCXpresso55S36 board
Personal Computer
Board settings
ADC CH0A input signal J7-1(PIO1_9).
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J1) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 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 lpadc dma example in the terminal window:
LPADC DMA Example
ADC Full Range: 65536
Please press any key to trigger the conversion.
Adc conversion word : 0x81008BA1
ADC conversion value: 35745
Adc conversion word : 0x81008BE7
ADC conversion value: 35815
Adc conversion word : 0x81008B14
ADC conversion value: 35604
LPCXpresso55S69
Hardware requirements
Mini/micro USB cable
LPCXpresso55s69 board
Personal Computer
Board settings
Connect a jumper to P15-2 and P15-3.
ADC CH0A input signal P28-1(PIO0-23).
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (P6) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 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 lpadc dma example in the terminal window:
LPADC DMA Example
ADC Full Range: 4096
Full channel scale (Factor of 1).
Please press any key to trigger the conversion.
Adc conversion word : 0x81006148
ADC conversion value: 3113
Adc conversion word : 0x81006140
ADC conversion value: 3112
Adc conversion word : 0x81006140
MIMXRT685-AUD-EVK
Hardware requirements
Micro USB cable
MIMXRT685-AUD-EVK board
Personal Computer
Board settings
Set VREF_L to GND, VREF_H to 1.8V (connect JP9, JP10).
Input voltage signal(0~1.8V) to LPADC0 CH0 (R405, P_5_ADC0_0 side)
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board
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.
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 terminal:
LPADC DMA Example
ADC Full Range: 4096
Full channel scale (Factor of 1).
Please press any key to trigger the conversion.
Adc conversion word : 0x81006148
ADC conversion value: 3113
Adc conversion word : 0x81006140
ADC conversion value: 3112
Adc conversion word : 0x81006140
ADC conversion value: 3112