flash_efc.c

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/*
 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
 */

#include <string.h>
#include <assert.h>
#include "flash_efc.h"
#include "sysclk.h"


#ifdef __cplusplus
extern "C" {
#endif


#if (SAM4E || SAM4N || SAM4S || SAM4C || SAMG || SAM4CP || SAM4CM || \
         SAMV71 || SAMV70 || SAMS70 || SAME70)
/* User signature size */
# define FLASH_USER_SIG_SIZE   (512)
#endif

#if SAM4S
/* Internal Flash Controller 0. */
# define EFC     EFC0
#if (SAM4SD16 || SAM4SD32)
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        3
#else
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        2
#endif
/* Internal Flash 0 base address. */
# define IFLASH_ADDR     IFLASH0_ADDR
/* Internal flash page size. */
# define IFLASH_PAGE_SIZE     IFLASH0_PAGE_SIZE
/* Internal flash lock region size. */
# define IFLASH_LOCK_REGION_SIZE     IFLASH0_LOCK_REGION_SIZE
#elif (SAM3XA || SAM3U4)
/* Internal Flash Controller 0. */
# define EFC     EFC0
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        3
/* Internal Flash 0 base address. */
# define IFLASH_ADDR     IFLASH0_ADDR
/* Internal flash page size. */
# define IFLASH_PAGE_SIZE     IFLASH0_PAGE_SIZE
/* Internal flash lock region size. */
# define IFLASH_LOCK_REGION_SIZE     IFLASH0_LOCK_REGION_SIZE
#elif (SAM3U)
/* There is no EFC1 for SAM3U except for SAM3U4 */
# undef EFC1
/* Internal Flash Controller 0. */
# define EFC     EFC0
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        2
/* Internal Flash 0 base address. */
# define IFLASH_ADDR     IFLASH0_ADDR
/* Internal flash page size. */
# define IFLASH_PAGE_SIZE     IFLASH0_PAGE_SIZE
/* Internal flash lock region size. */
# define IFLASH_LOCK_REGION_SIZE     IFLASH0_LOCK_REGION_SIZE
#elif (SAM3S8 || SAM3SD8)
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        3
/* Internal flash page size. */
# define IFLASH_PAGE_SIZE     IFLASH0_PAGE_SIZE
/* Internal flash lock region size. */
# define IFLASH_LOCK_REGION_SIZE     IFLASH0_LOCK_REGION_SIZE
#elif (SAM4C32 || SAM4CMP32 || SAM4CMS32)
/* The max GPNVM number SAM4C(M)32. */
# define GPNVM_NUM_MAX        3
#elif (SAMG)
/* The max GPNVM number SAMG. */
# define GPNVM_NUM_MAX        8
#elif (SAMV71 || SAMV70 || SAMS70 || SAME70)
/* The max GPNVM number SAMV/S/E. */
# define GPNVM_NUM_MAX        9
#else
/* The max GPNVM number. */
# define GPNVM_NUM_MAX        2
#endif

#if (SAM4C || SAM4CP || SAM4CM)
#if (SAM4C32 || SAM4CMP32 || SAM4CMS32)
# define EFC     EFC0
/* Internal Flash 0 base address. */
# define IFLASH0_ADDR    IFLASH0_CNC_ADDR
# define IFLASH1_ADDR    IFLASH1_CNC_ADDR
# define IFLASH_ADDR     IFLASH0_ADDR
/* Internal flash page size. */
# define IFLASH_PAGE_SIZE     IFLASH0_PAGE_SIZE
/* Internal flash lock region size. */
# define IFLASH_LOCK_REGION_SIZE     IFLASH0_LOCK_REGION_SIZE
#else
#define IFLASH_ADDR  IFLASH_CNC_ADDR
#endif
#endif

/* Flash page buffer for alignment */
static uint32_t gs_ul_page_buffer[IFLASH_PAGE_SIZE / sizeof(uint32_t)];

static void translate_address(Efc **pp_efc, uint32_t ul_addr,
                uint16_t *pus_page, uint16_t *pus_offset)
{
        Efc *p_efc;
        uint16_t us_page;
        uint16_t us_offset;

#if (SAM3XA || SAM3U4)
        if (ul_addr >= IFLASH1_ADDR) {
                p_efc = EFC1;
                us_page = (ul_addr - IFLASH1_ADDR) / IFLASH1_PAGE_SIZE;
                us_offset = (ul_addr - IFLASH1_ADDR) % IFLASH1_PAGE_SIZE;
        } else {
                p_efc = EFC0;
                us_page = (ul_addr - IFLASH0_ADDR) / IFLASH0_PAGE_SIZE;
                us_offset = (ul_addr - IFLASH0_ADDR) % IFLASH0_PAGE_SIZE;
        }
#elif (SAM4SD16 || SAM4SD32 || SAM4C32 || SAM4CMP32 || SAM4CMS32)
        uint32_t uc_gpnvm2;
        uc_gpnvm2 = flash_is_gpnvm_set(2);
        if (ul_addr >= IFLASH1_ADDR) {
                if(uc_gpnvm2 == FLASH_RC_YES) {
                        p_efc = EFC0;
                } else {
                        p_efc = EFC1;
                }
                us_page = (ul_addr - IFLASH1_ADDR) / IFLASH1_PAGE_SIZE;
                us_offset = (ul_addr - IFLASH1_ADDR) % IFLASH1_PAGE_SIZE;
        } else {
                if(uc_gpnvm2 == FLASH_RC_YES) {
                        p_efc = EFC1;
                } else {
                        p_efc = EFC0;
                }
                us_page = (ul_addr - IFLASH0_ADDR) / IFLASH0_PAGE_SIZE;
                us_offset = (ul_addr - IFLASH0_ADDR) % IFLASH0_PAGE_SIZE;
        }
#elif (SAM3S8 || SAM3SD8)
        p_efc = EFC;
        us_page = (ul_addr - IFLASH0_ADDR) / IFLASH0_PAGE_SIZE;
        us_offset = (ul_addr - IFLASH0_ADDR) % IFLASH0_PAGE_SIZE;
#else
        Assert(ul_addr >= IFLASH_ADDR);
        Assert(ul_addr <= (IFLASH_ADDR + IFLASH_SIZE));

        p_efc = EFC;
        us_page = (ul_addr - IFLASH_ADDR) / IFLASH_PAGE_SIZE;
        us_offset = (ul_addr - IFLASH_ADDR) % IFLASH_PAGE_SIZE;
#endif

        /* Store values */
        if (pp_efc) {
                *pp_efc = p_efc;
        }

        if (pus_page) {
                *pus_page = us_page;
        }

        if (pus_offset) {
                *pus_offset = us_offset;
        }
}

static void compute_address(Efc *p_efc, uint16_t us_page, uint16_t us_offset,
                uint32_t *pul_addr)
{
        uint32_t ul_addr;

/* Dual bank flash */
#ifdef EFC1
        /* Compute address */
#if (SAM4SD16 || SAM4SD32 || SAM4C32 || SAM4CMP32 || SAM4CMS32)
        uint32_t uc_gpnvm2;
        uc_gpnvm2 = flash_is_gpnvm_set(2);
        if (p_efc == EFC0) {
                if(uc_gpnvm2 == FLASH_RC_YES) {
                        ul_addr = IFLASH1_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
                } else {
                        ul_addr = IFLASH0_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
                }
        } else {
                if(uc_gpnvm2 == FLASH_RC_YES) {
                        ul_addr = IFLASH0_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
                } else {
                        ul_addr = IFLASH1_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
                }
        }
#else
        ul_addr = (p_efc == EFC0) ?
                        IFLASH0_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset :
                        IFLASH1_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
#endif
/* One bank flash */
#else
        /* avoid Cppcheck Warning */
        UNUSED(p_efc);
        /* Compute address */
        ul_addr = IFLASH_ADDR + us_page * IFLASH_PAGE_SIZE + us_offset;
#endif

        /* Store result */
        if (pul_addr != NULL) {
                *pul_addr = ul_addr;
        }
}

static void compute_lock_range(uint32_t ul_start, uint32_t ul_end,
                uint32_t *pul_actual_start, uint32_t *pul_actual_end)
{
        uint32_t ul_actual_start, ul_actual_end;

        ul_actual_start = ul_start - (ul_start % IFLASH_LOCK_REGION_SIZE);
        ul_actual_end = ul_end - (ul_end % IFLASH_LOCK_REGION_SIZE) +
                        IFLASH_LOCK_REGION_SIZE - 1;

        if (pul_actual_start) {
                *pul_actual_start = ul_actual_start;
        }

        if (pul_actual_end) {
                *pul_actual_end = ul_actual_end;
        }
}

uint32_t flash_init(uint32_t ul_mode, uint32_t ul_fws)
{
        efc_init(EFC, ul_mode, ul_fws);

#ifdef EFC1
        efc_init(EFC1, ul_mode, ul_fws);
#endif

        return FLASH_RC_OK;
}

uint32_t flash_set_wait_state(uint32_t ul_address, uint32_t ul_fws)
{
        Efc *p_efc;

        translate_address(&p_efc, ul_address, NULL, NULL);
        efc_set_wait_state(p_efc, ul_fws);

        return FLASH_RC_OK;
}

uint32_t flash_set_wait_state_adaptively(uint32_t ul_address)
{
        Efc *p_efc;
        uint32_t clock = sysclk_get_cpu_hz();

        translate_address(&p_efc, ul_address, NULL, NULL);

        /* Set FWS for embedded Flash access according to operating frequency */
        if (clock < CHIP_FREQ_FWS_0) {
                efc_set_wait_state(p_efc, 0);
        } else if (clock < CHIP_FREQ_FWS_1) {
                efc_set_wait_state(p_efc, 1);
        } else if (clock < CHIP_FREQ_FWS_2) {
                efc_set_wait_state(p_efc, 2);
#if (SAM3XA || SAM3U)
        } else if (clock < CHIP_FREQ_FWS_3) {
                efc_set_wait_state(p_efc, 3);
        } else {
                efc_set_wait_state(p_efc, 4);
        }
#elif (SAM4S || SAM4E || SAM4N || SAM4C || SAM4CP || SAM4CM || \
         SAMV71 || SAMV70 || SAMS70 || SAME70)
        } else if (clock < CHIP_FREQ_FWS_3) {
                efc_set_wait_state(p_efc, 3);
        } else if (clock < CHIP_FREQ_FWS_4) {
                efc_set_wait_state(p_efc, 4);
        } else {
                efc_set_wait_state(p_efc, 5);
        }
#else
        } else {
                efc_set_wait_state(p_efc, 3);
        }
#endif

        return FLASH_RC_OK;
}

uint32_t flash_get_wait_state(uint32_t ul_address)
{
        Efc *p_efc;

        translate_address(&p_efc, ul_address, NULL, NULL);
        return efc_get_wait_state(p_efc);
}

uint32_t flash_get_descriptor(uint32_t ul_address,
                uint32_t *pul_flash_descriptor, uint32_t ul_size)
{
        Efc *p_efc;
        uint32_t ul_tmp;
        uint32_t ul_cnt;

        translate_address(&p_efc, ul_address, NULL, NULL);

        /* Command fails */
        if (FLASH_RC_OK != efc_perform_command(p_efc, EFC_FCMD_GETD, 0)) {
                return 0;
        } else {
                /* Read until no result */
                for (ul_cnt = 0;; ul_cnt++) {
                        ul_tmp = efc_get_result(p_efc);
                        if ((ul_size > ul_cnt) && (ul_tmp != 0)) {
                                *pul_flash_descriptor++ = ul_tmp;
                        } else {
                                break;
                        }
                }
        }

        return ul_cnt;
}

uint32_t flash_get_page_count(const uint32_t *pul_flash_descriptor)
{
        return (pul_flash_descriptor[1] / pul_flash_descriptor[2]);
}

uint32_t flash_get_page_count_per_region(const uint32_t *pul_flash_descriptor)
{
        return (pul_flash_descriptor[4] / pul_flash_descriptor[2]);
}

uint32_t flash_get_region_count(const uint32_t *pul_flash_descriptor)
{
        return (pul_flash_descriptor[3]);
}

uint32_t flash_erase_all(uint32_t ul_address)
{
        Efc *p_efc;

        translate_address(&p_efc, ul_address, NULL, NULL);

        if (EFC_RC_OK != efc_perform_command(p_efc, EFC_FCMD_EA, 0)) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}

#if (SAM3S8 || SAM3SD8)

uint32_t flash_erase_plane(uint32_t ul_address)
{
        Efc *p_efc;
        uint16_t us_page;

        translate_address(&p_efc, ul_address, &us_page, NULL);

        if (EFC_RC_OK != efc_perform_command(p_efc, EFC_FCMD_EPL, us_page)) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}
#endif

#if (SAM4S || SAM4E || SAM4N || SAM4C || SAMG || SAM4CP || SAM4CM || \
         SAMV71 || SAMV70 || SAMS70 || SAME70)

uint32_t flash_erase_page(uint32_t ul_address, uint8_t uc_page_num)
{
        Efc *p_efc;
        uint16_t us_page;

        if (uc_page_num >= IFLASH_ERASE_PAGES_INVALID) {
                return FLASH_RC_INVALID;
        }

        if (ul_address & (IFLASH_PAGE_SIZE - 1)) {
                return FLASH_RC_INVALID;
        }

        translate_address(&p_efc, ul_address, &us_page, NULL);

        if (EFC_RC_OK != efc_perform_command(p_efc, EFC_FCMD_EPA,
                                        (us_page | uc_page_num))) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}

uint32_t flash_erase_sector(uint32_t ul_address)
{
        Efc *p_efc;
        uint16_t us_page;

        translate_address(&p_efc, ul_address, &us_page, NULL);

        if (EFC_RC_OK != efc_perform_command(p_efc, EFC_FCMD_ES, us_page)) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}
#endif

uint32_t flash_write(uint32_t ul_address, const void *p_buffer,
                uint32_t ul_size, uint32_t ul_erase_flag)
{
        Efc *p_efc;
        uint32_t ul_fws_temp;
        uint16_t us_page;
        uint16_t us_offset;
        uint32_t writeSize;
        uint32_t ul_page_addr;
        uint16_t us_padding;
        uint32_t ul_error;
        uint32_t ul_idx;
        uint32_t *p_aligned_dest;
        uint8_t *puc_page_buffer = (uint8_t *) gs_ul_page_buffer;

        translate_address(&p_efc, ul_address, &us_page, &us_offset);

#if SAM3S || SAM3N || SAM3XA || SAM3U
        /* According to the errata, set the wait state value to 6. */
        ul_fws_temp = efc_get_wait_state(p_efc);
        efc_set_wait_state(p_efc, 6);
#else
        UNUSED(ul_fws_temp);
#endif

        /* Write all pages */
        while (ul_size > 0) {
                /* Copy data in temporary buffer to avoid alignment problems. */
                writeSize = Min((uint32_t) IFLASH_PAGE_SIZE - us_offset,
                                ul_size);
                compute_address(p_efc, us_page, 0, &ul_page_addr);
                us_padding = IFLASH_PAGE_SIZE - us_offset - writeSize;

                /* Pre-buffer data */
                memcpy(puc_page_buffer, (void *)ul_page_addr, us_offset);

                /* Buffer data */
                memcpy(puc_page_buffer + us_offset, p_buffer, writeSize);

                /* Post-buffer data */
                memcpy(puc_page_buffer + us_offset + writeSize,
                                (void *)(ul_page_addr + us_offset + writeSize),
                                us_padding);

                /* Write page.
                 * Writing 8-bit and 16-bit data is not allowed and may lead to
                 * unpredictable data corruption.
                 */
        uint32_t tmp;
                p_aligned_dest = (uint32_t *) ul_page_addr;
                for (ul_idx = 0; ul_idx < (IFLASH_PAGE_SIZE / sizeof(uint32_t)); ++ul_idx) 
        {
            tmp = gs_ul_page_buffer[ul_idx];
                        *p_aligned_dest = tmp;
            p_aligned_dest++;
                }

                if (ul_erase_flag) {
                        ul_error = efc_perform_command(p_efc, EFC_FCMD_EWP,
                                        us_page);
                } else {
                        ul_error = efc_perform_command(p_efc, EFC_FCMD_WP,
                                        us_page);
                }

                if (ul_error) {
                        return ul_error;
                }

                /* Progression */
                p_buffer = (void *)((uint32_t) p_buffer + writeSize);
                ul_size -= writeSize;
                us_page++;
                us_offset = 0;
        }

#if SAM3S || SAM3N || SAM3XA || SAM3U
        /* According to the errata, restore the wait state value. */
        efc_set_wait_state(p_efc, ul_fws_temp);
#endif

        return FLASH_RC_OK;
}


uint32_t flash_lock(uint32_t ul_start, uint32_t ul_end,
                uint32_t *pul_actual_start, uint32_t *pul_actual_end)
{
        Efc *p_efc;
        uint32_t ul_actual_start, ul_actual_end;
        uint16_t us_start_page, us_end_page;
        uint32_t ul_error;
        uint16_t us_num_pages_in_region =
                        IFLASH_LOCK_REGION_SIZE / IFLASH_PAGE_SIZE;

        /* Compute actual lock range and store it */
        compute_lock_range(ul_start, ul_end, &ul_actual_start, &ul_actual_end);

        if (pul_actual_start != NULL) {
                *pul_actual_start = ul_actual_start;
        }

        if (pul_actual_end != NULL) {
                *pul_actual_end = ul_actual_end;
        }

        /* Compute page numbers */
        translate_address(&p_efc, ul_actual_start, &us_start_page, 0);
        translate_address(0, ul_actual_end, &us_end_page, 0);

        /* Lock all pages */
        while (us_start_page < us_end_page) {
                ul_error = efc_perform_command(p_efc, EFC_FCMD_SLB, us_start_page);

                if (ul_error) {
                        return ul_error;
                }
                us_start_page += us_num_pages_in_region;
        }

        return FLASH_RC_OK;
}

uint32_t flash_unlock(uint32_t ul_start, uint32_t ul_end,
                uint32_t *pul_actual_start, uint32_t *pul_actual_end)
{
        Efc *p_efc;
        uint32_t ul_actual_start, ul_actual_end;
        uint16_t us_start_page, us_end_page;
        uint32_t ul_error;
        uint16_t us_num_pages_in_region =
                        IFLASH_LOCK_REGION_SIZE / IFLASH_PAGE_SIZE;

        /* Compute actual unlock range and store it */
        compute_lock_range(ul_start, ul_end, &ul_actual_start, &ul_actual_end);
        if (pul_actual_start != NULL) {
                *pul_actual_start = ul_actual_start;
        }
        if (pul_actual_end != NULL) {
                *pul_actual_end = ul_actual_end;
        }

        /* Compute page numbers */
        translate_address(&p_efc, ul_actual_start, &us_start_page, 0);
        translate_address(0, ul_actual_end, &us_end_page, 0);

        /* Unlock all pages */
        while (us_start_page < us_end_page) {
                ul_error = efc_perform_command(p_efc, EFC_FCMD_CLB,
                                us_start_page);
                if (ul_error) {
                        return ul_error;
                }
                us_start_page += us_num_pages_in_region;
        }

        return FLASH_RC_OK;
}

uint32_t flash_is_locked(uint32_t ul_start, uint32_t ul_end)
{
        Efc *p_efc;
        uint16_t us_start_page, us_end_page;
        uint8_t uc_start_region, uc_end_region;
        uint16_t us_num_pages_in_region;
        uint32_t ul_status;
        uint32_t ul_error;
        uint32_t ul_num_locked_regions = 0;
        uint32_t ul_count = 0;
        uint32_t ul_bit = 0;

        Assert(ul_end >= ul_start);

#ifdef EFC1
        Assert(((ul_start >= IFLASH0_ADDR)
                                && (ul_end <= IFLASH0_ADDR + IFLASH0_SIZE))
                                || ((ul_start >= IFLASH1_ADDR)
                                        && (ul_end <= IFLASH1_ADDR + IFLASH1_SIZE)));
#else
        Assert((ul_start >= IFLASH_ADDR)
                                && (ul_end <= IFLASH_ADDR + IFLASH_SIZE));
#endif

        /* Compute page numbers */
        translate_address(&p_efc, ul_start, &us_start_page, 0);
        translate_address(0, ul_end, &us_end_page, 0);

        /* Compute region numbers */
        us_num_pages_in_region = IFLASH_LOCK_REGION_SIZE / IFLASH_PAGE_SIZE;
        uc_start_region = us_start_page / us_num_pages_in_region;
        uc_end_region = us_end_page / us_num_pages_in_region;

        /* Retrieve lock status */
        ul_error = efc_perform_command(p_efc, EFC_FCMD_GLB, 0);
        if (ul_error) {
                return ul_error;
        }
    UNUSED(ul_error);

        /* Skip unrequested regions (if necessary) */
        ul_status = efc_get_result(p_efc);
        while (!(ul_count <= uc_start_region &&
                        uc_start_region < (ul_count + 32))) {
                ul_status = efc_get_result(p_efc);
                ul_count += 32;
        }

        /* Check status of each involved region */
        ul_bit = uc_start_region - ul_count;

        /* Number of region to check (must be > 0) */
        ul_count = uc_end_region - uc_start_region + 1;

        while (ul_count > 0) {
                if (ul_status & (1 << (ul_bit))) {
                        ul_num_locked_regions++;
                }

                ul_count -= 1;
                ul_bit += 1;
                if (ul_bit == 32) {
                        ul_status = efc_get_result(p_efc);
                        ul_bit = 0;
                }
        }

        return ul_num_locked_regions;
}

uint32_t flash_set_gpnvm(uint32_t ul_gpnvm)
{
        if (ul_gpnvm >= GPNVM_NUM_MAX) {
                return FLASH_RC_INVALID;
        }

        if (FLASH_RC_YES == flash_is_gpnvm_set(ul_gpnvm)) {
                return FLASH_RC_OK;
        }

        if (EFC_RC_OK == efc_perform_command(EFC, EFC_FCMD_SGPB, ul_gpnvm)) {
                return FLASH_RC_OK;
        }

        return FLASH_RC_ERROR;
}

uint32_t flash_clear_gpnvm(uint32_t ul_gpnvm)
{
        if (ul_gpnvm >= GPNVM_NUM_MAX) {
                return FLASH_RC_INVALID;
        }

        if (FLASH_RC_NO == flash_is_gpnvm_set(ul_gpnvm)) {
                return FLASH_RC_OK;
        }

        if (EFC_RC_OK == efc_perform_command(EFC, EFC_FCMD_CGPB, ul_gpnvm)) {
                return FLASH_RC_OK;
        }

        return FLASH_RC_ERROR;
}

uint32_t flash_is_gpnvm_set(uint32_t ul_gpnvm)
{
        uint32_t ul_gpnvm_bits;

        if (ul_gpnvm >= GPNVM_NUM_MAX) {
                return FLASH_RC_INVALID;
        }

        if (EFC_RC_OK != efc_perform_command(EFC, EFC_FCMD_GGPB, 0)) {
                return FLASH_RC_ERROR;
        }

        ul_gpnvm_bits = efc_get_result(EFC);
        if (ul_gpnvm_bits & (1 << ul_gpnvm)) {
                return FLASH_RC_YES;
        }

        return FLASH_RC_NO;
}

uint32_t flash_enable_security_bit(void)
{
        return flash_set_gpnvm(0);
}

uint32_t flash_is_security_bit_enabled(void)
{
        return flash_is_gpnvm_set(0);
}

uint32_t flash_read_unique_id(uint32_t *pul_data, uint32_t ul_size)
{
        uint32_t uid_buf[4];
        uint32_t ul_idx;

        if (FLASH_RC_OK != efc_perform_read_sequence(EFC, EFC_FCMD_STUI,
                        EFC_FCMD_SPUI, uid_buf, 4)) {
                return FLASH_RC_ERROR;
        }

        if (ul_size > 4) {
                /* Only 4 dword to store unique ID */
                ul_size = 4;
        }

        for (ul_idx = 0; ul_idx < ul_size; ul_idx++) {
                pul_data[ul_idx] = uid_buf[ul_idx];
        }

        return FLASH_RC_OK;
}

#if (SAM4S || SAM4E || SAM4N || SAM4C || SAMG || SAM4CP || SAM4CM || \
         SAMV71 || SAMV70 || SAMS70 || SAME70)

uint32_t flash_read_user_signature(uint32_t *p_data, uint32_t ul_size)
{
        if (ul_size > (FLASH_USER_SIG_SIZE / sizeof(uint32_t))) {
                /* Only 512 byte to store user signature */
                ul_size = FLASH_USER_SIG_SIZE / sizeof(uint32_t);
        }

        /* Send the read user signature commands */
        if (FLASH_RC_OK != efc_perform_read_sequence(EFC, EFC_FCMD_STUS,
                        EFC_FCMD_SPUS, p_data, ul_size)) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}

uint32_t flash_write_user_signature(const void *p_buffer, uint32_t ul_size)
{
        uint32_t ul_idx;
        uint32_t *p_dest;

        /* The user signature should be no longer than 512 bytes */
        if (ul_size > (IFLASH_PAGE_SIZE / sizeof(uint32_t))) {
                return FLASH_RC_INVALID;
        }

        /* Copy Buffer data */
        memcpy((uint8_t *) gs_ul_page_buffer, p_buffer, 
                        ul_size * sizeof(uint32_t));

        /* Write page buffer.
        * Writing 8-bit and 16-bit data is not allowed and may lead to
        * unpredictable data corruption.
        */
        p_dest = (uint32_t *)IFLASH_ADDR;
        for (ul_idx = 0; ul_idx < (IFLASH_PAGE_SIZE / sizeof(uint32_t)); 
                        ul_idx++) {
                *p_dest++ = gs_ul_page_buffer[ul_idx];
        }

        /* Send the write signature command */
        if (FLASH_RC_OK != efc_perform_command(EFC, EFC_FCMD_WUS, 0)) {
                return FLASH_RC_ERROR;
        }

        return FLASH_RC_OK;
}

uint32_t flash_erase_user_signature(void)
{
        /* Perform the erase user signature command */
        return efc_perform_command(EFC, EFC_FCMD_EUS, 0);
}
#endif



#ifdef __cplusplus
}
#endif

---

inertial_sense_ros
Author(s):
autogenerated on Sat Sep 19 2020 03:19:04