1.6 DMAC Memory Transfer

This example application demonstrates how to use the DMAC peripheral to do a memory to memory transfer.

Description

The application uses a software trigger to initiate a memory-memory transfer from the source buffer to the destination buffer with 16-bit beat size and 32-bit beat size. The number of cycles taken for the DMA transfer is measured using the System timer (SysTick) and reported on the console.

Downloading and Building the Application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/apps/dmac/dmac_memory_transfer/firmware.

To build the application, refer to the following table and open the project using its IDE.


Project Name	Description
pic32cx_sg41_cult.X	MPLABX project for PIC32CX SG41 Curiosity Ultra Evaluation Board

Setting Up the Hardware

The following table shows the target hardware for the application projects.


Project Name	Board
pic32cx_sg41_cult.X	PIC32CX SG41 Curiosity Ultra Evaluation Board

Setting Up PIC32CX SG41 Curiosity Ultra Evaluation Board

Connect the Debug USB port on the board to the computer using a micro USB cable

Running the Application

Open the Terminal application (Ex.: Tera term) on the computer
Connect to the PKOB Virtual COM port and configure the serial settings as follows:
- Baud : 115200
- Data : 8 Bits
- Parity : None
- Stop : 1 Bit
- Flow Control : None
Build and Program the application using its IDE
LED indicates the success or failure:
- LED is turned ON when the DMAC memory transfer is successful.
  Following table provides the LED name:
  Board LED Name
  PIC32CX SG41 Curiosity Ultra Evaluation Board LED1
Observe output message in console as follows:
Note: The number of transfer cycles may vary.