crccu_example_efc.c File Reference

Cyclic Redundancy Check Calculation Unit (CRCCU) example for SAM.

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include <asf.h>
#include <string.h>
#include "conf_crccu_example.h"

Macros
#define	BUFFER_LENGTH   64
	CRC data buffer size (in byte) More...
#define	CRCCU_TIMEOUT   0xFFFFFFFF
	CRCCU operation time out value. More...
#define	FLASH_BUFFER_ADDRESS   (IFLASH_ADDR + IFLASH_SIZE / 2 - FLASH_BUFFER_SIZE * 8)
	Flash buffer address. More...
#define	FLASH_WAIT_STATE_NBR   6
	Flash wait state number. More...
#define	STRING_EOL   "\r"
#define	STRING_HEADER

Functions
static uint32_t	compute_crc (uint8_t *p_buffer, uint32_t ul_length, uint32_t ul_polynomial_type)
	Compute CRC of a buffer. More...
static uint32_t	compute_crc_and_compare (uint8_t *p_buffer, uint32_t ul_length, uint32_t ul_type, uint32_t ul_ref_crc)
	Compute CRC of a buffer and compare it with the reference CRC. More...
static void	configure_console (void)
	Configure the Console Uart. More...
int	main (void)
	Application entry point for CRCCU example. More...

Variables
crccu_dscr_type_t	crc_dscr
	CRC descriptor. More...
uint8_t	g_uc_data_buf [BUFFER_LENGTH]
	CRC data buffer. More...

#define BUFFER_LENGTH   64

CRC data buffer size (in byte)

Referenced by main().

#define CRCCU_TIMEOUT   0xFFFFFFFF

CRCCU operation time out value.

Referenced by compute_crc().

#define FLASH_BUFFER_ADDRESS   (IFLASH_ADDR + IFLASH_SIZE / 2 - FLASH_BUFFER_SIZE * 8)

Flash buffer address.

Referenced by main().

#define FLASH_WAIT_STATE_NBR   6

Flash wait state number.

Referenced by main().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"-- CRCCU Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

static uint32_t compute_crc ( uint8_t *  p_buffer, uint32_t  ul_length, uint32_t  ul_polynomial_type  )

static

Compute CRC of a buffer.

Parameters

p_buffer	The buffer holding the data.
ul_length	The buffer length.
ul_polynomial_type	The polynomial type(CRCCU_MR_PTYPE_XXX).

Returns

CRC of the buffer.

References crccu_configure_descriptor(), crccu_configure_mode(), crccu_enable_dma(), crccu_get_dma_status(), crccu_read_crc_value(), crccu_reset(), CRCCU_TIMEOUT, CRCCU_TR_CTRL_IEN_ENABLE, CRCCU_TR_CTRL_TRWIDTH_BYTE, crccu_dscr_type::ul_tr_addr, and crccu_dscr_type::ul_tr_ctrl.

Referenced by compute_crc_and_compare(), and main().

static uint32_t compute_crc_and_compare ( uint8_t *  p_buffer, uint32_t  ul_length, uint32_t  ul_type, uint32_t  ul_ref_crc  )

static

Compute CRC of a buffer and compare it with the reference CRC.

Parameters

p_Buffer	The buffer holding the data.
ul_length	The buffer length.
ul_type	The polynomial type(CRCCU_MR_PTYPE_XXX).
ul_ref_crc	Reference CRC for the buffer.

Returns

CRC of the buffer.

References compute_crc().

Referenced by main().

static void configure_console ( void  )

static

Configure the Console Uart.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

int main

(

void

)

Application entry point for CRCCU example.

Returns

Unused (ANSI-C compatibility).

References board_init(), BUFFER_LENGTH, compute_crc(), compute_crc_and_compare(), configure_console(), FLASH_ACCESS_MODE_128, FLASH_BUFFER_ADDRESS, flash_init(), flash_unlock(), FLASH_WAIT_STATE_NBR, flash_write(), g_uc_data_buf, IFLASH_ERASE_PAGES_16, IFLASH_ERASE_PAGES_8, NULL, pmc_enable_periph_clk(), STRING_HEADER, and sysclk_init().

crccu_dscr_type_t crc_dscr

CRC descriptor.

uint8_t g_uc_data_buf[BUFFER_LENGTH]

CRC data buffer.

Referenced by main().