example1/dma_example.c File Reference

AVR XMEGA DMA example.

Copyright (c) 2010-2018 Microchip Technology Inc. and its subsidiaries.

#include <conf_example.h>
#include <string.h>
#include <asf.h>

Functions
static void	example_dma_transfer_done (enum dma_channel_status status)
	Callback for DMA transfer complete. More...
static void	fill_pattern (uint8_t *buffer, size_t len)
	Fill buffer with a specific pattern. More...
int	main (void)
	main function More...
static bool	verify_pattern (uint8_t *buffer, size_t len)
	Verify if buffer if filled by the specific pattern generated by the fill_pattern() function. More...

Variables
static uint8_t	destination [DMA_BUFFER_SIZE]
	Destination buffer to use for DMA transfer. More...
static uint8_t	source [DMA_BUFFER_SIZE]
	Source buffer to use for DMA transfer. More...

static void example_dma_transfer_done ( enum dma_channel_status  status )

static

Callback for DMA transfer complete.

Parameters

status

Status of a completed (or failed) DMA transfer

References destination, DMA_CH_TRANSFER_COMPLETED, gpio_set_pin_low, source, and verify_pattern().

Referenced by main().

static void fill_pattern ( uint8_t *  buffer, size_t  len  )

static

Fill buffer with a specific pattern.

Parameters

buffer	Buffer to fill with a specific pattern
len	Length of the buffer

Referenced by main().

int main

(

void

)

main function

References board_init(), cpu_irq_enable, destination, dma_channel_enable(), dma_channel_set_burst_length(), dma_channel_set_dest_dir_mode(), dma_channel_set_dest_reload_mode(), dma_channel_set_destination_address(), dma_channel_set_interrupt_level(), dma_channel_set_source_address(), dma_channel_set_src_dir_mode(), dma_channel_set_src_reload_mode(), dma_channel_set_transfer_count(), dma_channel_trigger_block_transfer(), dma_channel_write_config(), dma_enable(), DMA_INT_LVL_LO, dma_set_callback(), example_dma_transfer_done(), fill_pattern(), gpio_set_pin_low, pmic_init(), sleepmgr_init(), source, and sysclk_init().

static bool verify_pattern ( uint8_t *  buffer, size_t  len  )

static

Verify if buffer if filled by the specific pattern generated by the fill_pattern() function.

Parameters

buffer	Buffer to verify
len	Length of the buffer

Return values

true	Buffer is equal to specific pattern
false	Buffer is not equal to specific pattern

Referenced by example_dma_transfer_done().

uint8_t destination[DMA_BUFFER_SIZE]

static

Destination buffer to use for DMA transfer.

Referenced by dma_channel_set_destination_address(), dma_channel_write_destination(), example_dma_transfer_done(), and main().

uint8_t source[DMA_BUFFER_SIZE]

static

Source buffer to use for DMA transfer.

Referenced by dma_channel_set_source_address(), dma_channel_set_trigger_source(), dma_channel_write_source(), example_dma_transfer_done(), gfx_draw_char_hugemem(), gfx_mono_draw_char_hugemem(), main(), and wtk_copy_string().