example3.c File Reference

CRC example3 for AVR XMEGA.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include <asf.h>
#include <led.h>
#include <status_codes.h>
#include <sleepmgr.h>

Macros
#define	DMA_BUFFER_SIZE   8
	Size of data buffer to transfer. More...
#define	DMA_CHANNEL   0
	DMA channel to use in example. More...

Functions
static void	example_crc_dma_transfer_done (enum dma_channel_status status)
	Callback for DMA transfer complete. More...
int	main (void)
	main 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...

#define DMA_BUFFER_SIZE   8

Size of data buffer to transfer.

Referenced by main().

#define DMA_CHANNEL   0

DMA channel to use in example.

Referenced by main().

static void example_crc_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 crc_dma_checksum_stop(), LED1_GPIO, and LED_On.

Referenced by main().

int main

(

void

)

main function

This example will configure a DMA channel with the following settings:

• Low interrupt priority
• 1 byte burst length
• DMA_BUFFER_SIZE bytes for each transfer
• Reload source and destination address at end of each transfer
• Increment source and destination address during transfer
• Source address is set to source
• Destination address is set to destination

References board_init(), cpu_irq_enable, crc16_append_value(), CRC_16BIT, crc_io_checksum(), destination, DMA_BUFFER_SIZE, DMA_CHANNEL, 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_set_callback(), example_crc_dma_transfer_done(), gpio_set_pin_low, LED0_GPIO, pmic_init(), PMIC_LVL_LOW, sleepmgr_init(), source, and sysclk_init().

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(), and main().

uint8_t source[DMA_BUFFER_SIZE]

static

Source buffer to use for DMA transfer.

Referenced by crc_set_source(), dma_channel_set_source_address(), dma_channel_set_trigger_source(), dma_channel_write_source(), and main().