1.15 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/dmac/dmac_memory_transfer/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_c21n_xpro.X | MPLABX project for SAMC21N Xplained Pro Evaluation Kit |
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| sam_c21n_xpro.X | SAMC21N Xplained Pro Evaluation Kit |
Setting Up SAMC21N Xplained Pro Evaluation Kit
- 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 EDBG 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 SAMC21N Xplained Pro Evaluation Kit LED0
- Observe output message in console as follows:
Note: The number of transfer cycles may vary.