Configure DMA

1.
Create a DMA resource configuration structure, which can be filled out to adjust the configuration of a single DMA transfer.
```
struct dma_resource_config config;
```
2.
Initialize the DMA resource configuration struct with the module's default values.
```
dma_get_config_defaults(&config);
config.peripheral_trigger = M2M_DMAC_TRIGGER_ID;
```
Note: This should always be performed before using the configuration struct to ensure that all values are initialized to known default settings.
3.
Allocate a DMA resource with the configurations.
```
dma_allocate(resource, &config);
```
4.
Create a DMA transfer descriptor configuration structure, which can be filled out to adjust the configuration of a single DMA transfer.
```
struct dma_descriptor_config descriptor_config;
```
5.
Initialize the DMA transfer descriptor configuration struct with the module's default values.
```
dma_descriptor_get_config_defaults(&descriptor_config);
```
Note: This should always be performed before using the configuration struct to ensure that all values are initialized to known default settings.

Set the specific parameters for a DMA transfer with transfer size, source address, and destination address.

descriptor_config.block_transfer_count = TRANSFER_SIZE;
descriptor_config.source_address = (uint32_t)source_memory + TRANSFER_SIZE;
descriptor_config.destination_address =
        (uint32_t)destination_memory + TRANSFER_SIZE;

Create the DMA transfer descriptor.

dma_descriptor_create(descriptor, &descriptor_config);

8.
Add the DMA transfer descriptor to the allocated DMA resource.
```
dma_add_descriptor(&example_resource, &example_descriptor);
```

dma_register_callback(&example_resource, transfer_done,
        DMA_CALLBACK_TRANSFER_DONE);

10.

The transfer done flag is set in the registered callback function.

void transfer_done(struct dma_resource* const resource )
{
    UNUSED(resource);

    transfer_is_done = true;
}