/**
* \brief Write the data and/or spare area of a NAND Flash page, after
* calculating an ECC for the data area and storing it in the spare. If no
* data buffer is provided, the ECC is read from the existing page spare. If
* no spare buffer is provided, the spare area is still written with the ECC
* information calculated on the data buffer.
*
* \param ecc Pointer to an nand_flash_ecc instance.
* \param block Number of block to read from.
* \param page Number of page to read inside given block.
* \param data Data area buffer.
* \param spare Spare area buffer.
*
* \return 0 if successful; otherwise return the error code.
*/
uint32_t nand_flash_ecc_write_page(const struct nand_flash_ecc *ecc,
uint16_t block, uint16_t page, uint8_t *data, uint8_t *spare)
{
uint32_t error;
uint16_t page_data_size
= nand_flash_model_get_page_data_size(MODEL(ecc));
uint8_t hamming_code[NAND_COMMON_MAX_SPARE_ECC_BYTES];
uint8_t spare_buffer[NAND_COMMON_MAX_PAGE_SPARE_SIZE];
/**
* Compute ECC on the new data, if provided. If not provided, hamming
* code set to 0xFFFF.. to keep existing bytes.
*/
memset(hamming_code, 0xFF, NAND_COMMON_MAX_SPARE_ECC_BYTES);
if (data) {
/* Compute hamming code on data */
hamming_compute_256x(data, page_data_size, hamming_code);
}
/* if no buffer provided, use a temp one */
if (!spare) {
spare = spare_buffer;
}
memset(spare, 0xFF, NAND_COMMON_MAX_PAGE_SPARE_SIZE);
nand_flash_spare_scheme_write_ecc(nand_flash_model_get_scheme(MODEL(ecc)),
spare, hamming_code);
/* Perform write operation */
error = nand_flash_raw_write_page(RAW(ecc), block, page, data, spare);
if (error) {
return error;
}
return 0;
}
int main(void)
{
uint16_t block, page;
uint32_t i;
uint32_t error = 0;
/* Initialize the SAM3 system */
sysclk_init();
board_init();
/* Initialize the console uart */
configure_console();
/* Output example information */
printf("-- NAND Flash Raw Example --\n\r");
printf("-- %s\n\r", BOARD_NAME);
printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
memset(&nf_raw, 0, sizeof(nf_raw));
if (nand_flash_raw_initialize(&nf_raw, 0, cmd_address,
addr_address, data_address)) {
printf("-E- Device Unknown\n\r");
return 0;
}
printf("-I- NAND Flash driver initialized\n\r");
/* Get device parameters */
mem_size = nand_flash_model_get_device_size_in_bytes(&nf_raw.model);
block_size = nand_flash_model_get_block_size_in_bytes(&nf_raw.model);
num_block = nand_flash_model_get_device_size_in_blocks(&nf_raw.model);
page_size = nand_flash_model_get_page_data_size(&nf_raw.model);
pages_per_block =
nand_flash_model_get_block_size_in_pages(&nf_raw.model);
printf("-I- Size of the whole device in bytes : 0x%x \n\r", mem_size);
printf("-I- Size in bytes of one single block of a device : 0x%x \n\r",
block_size);
printf("-I- Number of blocks in the entire device : 0x%x \n\r",
num_block);
printf("-I- Size of the data area of a page in bytes : 0x%x \n\r",
page_size);
printf("-I- Number of pages in the entire device : 0x%x \n\r",
pages_per_block);
/* Erase all block and use the last good block for read/write test */
for (i = 0; i < num_block; i++) {
error = nand_flash_raw_erase_block(&nf_raw, i);
if (error == NAND_COMMON_ERROR_BADBLOCK) {
printf("-E- Block %u is BAD block. \n\r", i);
} else {
block = i;
}
}
/* Prepare a page size buffer in SRAM. */
printf("-I- Preparing a buffer in SRAM ...\n\r");
for (i = 0; i < page_size; i++) {
write_buffer[i] = i & 0xFF;
}
/* Reset read buffer. */
memset(read_buffer, 0, sizeof(read_buffer));
/* Select a page. */
page = 0;
/* Write a page to the NAND Flash. */
printf("-I- Write the buffer in page %d of block %d without ECC.\n\r",
page, block);
error = nand_flash_raw_write_page(&nf_raw, block, page, write_buffer,
0);
if (error) {
printf("-E- Cannot write page %d of block %d.\n\r", page,
block);
return error;
}
/* Read the page from the NAND Flash. */
printf("-I- Read page %d of block %d without ECC.\n\r", page, block);
nand_flash_raw_read_page(&nf_raw, block, page, read_buffer, 0);
/* Test if the read buffer is the same as SRAM buffer */
error = memcmp(read_buffer, write_buffer, sizeof(write_buffer));
if (error) {
printf("-I- Read data is different from write data.\n\r");
printf("-I- Need ECC module when handle this page.\n\r");
return 0;
}
printf("-I- Read data matches write data.\n\r");
printf("-I- Test passed.\n\r");
while (1) {
/* Do nothing */
}
}
