sdk-rt-thread-source-code/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_l1.c

/*
 * Copyright (c) 2024, chasel
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author            Notes
 * 2024-6-21      chasel            first version
 */

#include <board.h>
#include <rtconfig.h>
#include <rtdef.h>

#ifdef BSP_USING_ON_CHIP_FLASH
#include "drv_config.h"
#include "drv_flash.h"

#if defined(RT_USING_FAL)
#include "fal.h"
#endif

#define DRV_DEBUG
#define LOG_TAG                "drv.flash"
#include <drv_log.h>

/**
 * Read data from flash.
 * @note This operation's units is word.
 *
 * @param addr flash address
 * @param buf buffer to store read data
 * @param size read bytes size
 *
 * @return result
 */
int stm32_flash_read(rt_uint32_t addr, rt_uint8_t *buf, size_t size)
{
    size_t i;

    if ((addr + size) > STM32_FLASH_END_ADDRESS)
    {
        LOG_E("read outrange flash size! addr is (0x%p)", (void* )(addr + size));
        return -RT_EINVAL;
    }

    for (i = 0; i < size; i++, buf++, addr++)
    {
        *buf = *(rt_uint8_t *) addr;
    }

    return size;
}

/**
 * Write data to flash.
 * @note This operation's units is word.
 * @note This operation must after erase. @see flash_erase.
 *
 * @param addr flash address
 * @param buf the write data buffer
 * @param size write bytes size
 *
 * @return result
 */

int stm32_flash_write(rt_uint32_t addr, const uint8_t *buf, size_t size)
{
    rt_err_t result = RT_EOK;
    rt_uint32_t end_addr = addr + size;

    if (addr % 4 != 0)
    {
        LOG_E("write addr must be 4-byte alignment");
        return -RT_EINVAL;
    }

    if ((end_addr) > STM32_FLASH_END_ADDRESS)
    {
        LOG_E("write outrange flash size! addr is (0x%p)", (void * )(addr + size));
        return -RT_EINVAL;
    }

    HAL_FLASH_Unlock();

    while (addr < end_addr)
    {
        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, addr, *((rt_uint32_t *) buf)) == HAL_OK)
        {
            if (*(rt_uint32_t *) addr != *(rt_uint32_t *) buf)
            {
                result = -RT_ERROR;
                break;
            }
            addr += 4;
            buf += 4;
        }
        else
        {
            result = -RT_ERROR;
            break;
        }
    }

    HAL_FLASH_Lock();

    if (result != RT_EOK)
    {
        return result;
    }

    return size;
}

/**
 * Erase data on flash.
 * @note This operation is irreversible.
 * @note This operation's units is different which on many chips.
 *
 * @param addr flash address
 * @param size erase bytes size
 *
 * @return result
 */
int stm32_flash_erase(rt_uint32_t addr, size_t size)
{
    rt_err_t result = RT_EOK;
    uint32_t PAGEError = 0;

    /*Variable used for Erase procedure*/
    FLASH_EraseInitTypeDef EraseInitStruct;

    if ((addr + size) > STM32_FLASH_END_ADDRESS)
    {
        LOG_E("ERROR: erase outrange flash size! addr is (0x%p)\n", (void * )(addr + size));
        return -RT_EINVAL;
    }

    HAL_FLASH_Unlock();

    /* Fill EraseInit structure*/
    EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
    EraseInitStruct.PageAddress = addr;
    EraseInitStruct.NbPages = (size + FLASH_PAGE_SIZE - 1) / FLASH_PAGE_SIZE;

    if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
    {
        result = -RT_ERROR;
        goto __exit;
    }

    __exit: HAL_FLASH_Lock();

    if (result != RT_EOK)
    {
        return result;
    }

    LOG_D("erase done: addr (0x%p), size %d", (void* )addr, size);
    return size;
}

#if defined(RT_USING_FAL)

static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size);
static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size);
static int fal_flash_erase(long offset, size_t size);

const struct fal_flash_dev stm32_onchip_flash = { "onchip_flash", STM32_FLASH_START_ADRESS, STM32_FLASH_SIZE,
        FLASH_PAGE_SIZE, { NULL, fal_flash_read, fal_flash_write, fal_flash_erase } };

static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size)
{
    return stm32_flash_read(stm32_onchip_flash.addr + offset, buf, size);
}

static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size)
{
    return stm32_flash_write(stm32_onchip_flash.addr + offset, buf, size);
}

static int fal_flash_erase(long offset, size_t size)
{
    return stm32_flash_erase(stm32_onchip_flash.addr + offset, size);
}

#endif
#endif /* BSP_USING_ON_CHIP_FLASH */