Specifications

int alt_erase_flash_block ( alt_flash_fd* fd, int offset, int length )
The flash memory is identified by the handle fd. The block is identified as being offset bytes from the
beginning of the flash memory, and the block size is passed in length.
alt_write_flash_block()
alt_write_flash_block() writes to a single block in the flash memory. The prototype is:
int alt_write_flash_block( alt_flash_fd* fd,
int block_offset,
int data_offset,
const void *data,
int length)
This function writes to the flash memory identified by the handle fd. It writes to the block located
block_offset bytes from the start of the flash device. The function writes length bytes of data from the
location pointed to by data to the location data_offset bytes from the start of the flash device.
Note:
These program and erase functions do not perform address checking, and do not verify whether a
write operation spans into the next block. You must pass in valid information about the blocks to
program or erase.
Example 6–11. Using the Fine-Grained Flash Access API Functions
#include <string.h>
#include "sys/alt_flash.h"
#include "stdtypes.h"
#include "system.h"
#define BUF_SIZE 100
int main (void)
{
flash_region* regions;
alt_flash_fd* fd;
int number_of_regions;
int ret_code;
char write_data[BUF_SIZE];
/* Set write_data to all 0xa */
memset(write_data, 0xA, BUF_SIZE);
fd = alt_flash_open_dev(EXT_FLASH_NAME);
if (fd)
{
ret_code = alt_get_flash_info(fd, &regions, &number_of_regions);
if (number_of_regions && (regions->offset == 0))
{
/* Erase the first block */
ret_code = alt_erase_flash_block(fd,
regions->offset,
regions->block_size);
if (ret_code == 0) {
/*
* Write BUF_SIZE bytes from write_data 100 bytes to
* the first block of the flash
*/
ret_code = alt_write_flash_block (
fd,
regions->offset,
regions->offset+0x100,
write_data,
BUF_SIZE );
}
}
}
NII5V2
2015.05.14
alt_write_flash_block()
6-21
Developing Programs Using the Hardware Abstraction Layer
Altera Corporation
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