[Atmel] 用ASF跑SAMD21程序(23)DMAC

/**

 * \file

 *

 * \brief Empty user application template

 *

 */



/**

 * \mainpage User Application template doxygen documentation

 *

 * \par Empty user application template

 *

 * This is a bare minimum user application template.

 *

 * For documentation of the board, go \ref group_common_boards "here" for a link

 * to the board-specific documentation.

 *

 * \par Content

 *

 * -# Include the ASF header files (through asf.h)

 * -# Minimal main function that starts with a call to system_init()

 * -# Basic usage of on-board LED and button

 * -# "Insert application code here" comment

 *

 */



/*

 * Include header files for all drivers that have been imported from

 * Atmel Software Framework (ASF).

 */

 /**

 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>

 */

#include <asf.h>

struct dma_resource example_resource;

#define DATA_LENGTH (512)

static uint8_t source_memory[DATA_LENGTH];

static uint8_t destination_memory[DATA_LENGTH];

static volatile bool transfer_is_done = false;

COMPILER_ALIGNED(16)

DmacDescriptor example_descriptor;

static void transfer_done( const struct dma_resource* const resource )

{    transfer_is_done = true;}

static void configure_dma_resource(struct dma_resource *resource)

{    

        struct dma_resource_config config;

        dma_get_config_defaults(&config);

        dma_allocate(resource, &config);}

static void setup_transfer_descriptor(DmacDescriptor *descriptor )

{    

        struct dma_descriptor_config descriptor_config;

        dma_descriptor_get_config_defaults(&descriptor_config);

        descriptor_config.block_transfer_count = sizeof(source_memory);

        descriptor_config.source_address = (uint32_t)source_memory +        sizeof(source_memory);

        descriptor_config.destination_address = (uint32_t)destination_memory +        sizeof(source_memory);

        dma_descriptor_create(descriptor, &descriptor_config);}





int main (void)

{

        system_init();

        

         configure_dma_resource(&example_resource);

         setup_transfer_descriptor(&example_descriptor);

         dma_add_descriptor(&example_resource, &example_descriptor);

         dma_register_callback(&example_resource, transfer_done,            DMA_CALLBACK_TRANSFER_DONE);

         dma_enable_callback(&example_resource, DMA_CALLBACK_TRANSFER_DONE);

         for (uint32_t i = 0; i < DATA_LENGTH; i++) 

         {        source_memory[i] = i;    }



      

          

           dma_start_transfer_job(&example_resource);

           dma_trigger_transfer(&example_resource);

           while (!transfer_is_done) {        /* Wait for transfer done */    }   

           while (true) {        /* Nothing to do */    }

}