1.9 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. Transfer status is reported on 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/dmac/dmac_memory_transfer/firmware.

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

Project NameDescription
pic32mx470_curiosity.XMPLABX project for Curiosity PIC32MX470 Development Board
pic32mx_xlp_sk.XMPLABX project for PIC32MX274 XLP Starter Kit
pic32mx_sk.XMPLABX project for PIC32MX Starter Kit

Setting Up the Hardware

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

Project NameDescription
pic32mx470_curiosity.XCuriosity PIC32MX470 Development Board
pic32mx_xlp_sk.XPIC32MX274 XLP Starter Kit
pic32mx_sk.XPIC32MX Starter Kit

Setting Up Curiosity PIC32MX470 Development Board

  • To run the demo, the following additional hardware are required:
  • Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer
  • Install an USB UART click board on to the mikroBUS socket J5
  • Connect mini USB cable between PC and the USB UART click board
    Note: Ensure that the series resistors on the mikroBUS headers are of value 0 Ohms.

Setting Up PIC32MX274 XLP Starter Kit

Setting Up PIC32MX Starter Kit

  • Connect mini USB cable to the ‘Debug USB’ connector(J1) on the board to the computer

Running the Application

  1. Open the Terminal application (Ex.: Tera term) on the computer
  2. Connect to the “USB to UART” COM port and configure the serial settings as follows:
    • Baud : 115200
    • Data : 8 Bits
    • Parity : None
    • Stop : 1 Bit
    • Flow Control : None
  3. Build and Program the application project using its IDE
  4. Following message is output on console:
  5. The LED indicates the success or failure:
    • The LED is turned ON when the DMAC memory transfer is successful
Following table provides LED names:
BoardLED Name
Curiosity PIC32MX470 Development BoardLED1
PIC32MX274 XLP Starter KitLED1 (RED)
PIC32MX Starter KitLED3 (GREEN)
Note: For PIC32MX Starter Kit, console output is not applicable