GD32 FMC — Flash 写保护

Tue, 08 Sep 2026 14:52:21 +0800

FMC — Flash 写保护

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/FMC/Write_Protection/main.c

功能简介

本示例演示 FMC 的基本用法。

完整代码

#include "gd32f30x.h" 
#include "gd32f307c_eval.h"
#include <stdio.h>
#define FLASH_PAGE_PROGRAM
#define WRITE_PROTECTION_DISABLE
typedef enum {FAILED = 0, PASSED = !FAILED} test_state;
#define FLASH_PAGE_SIZE ((uint16_t)0x800)
#define FMC_PAGES_PROTECTED (OB_WP_6 | OB_WP_7)
#define BANK0_WRITE_START_ADDR  ((uint32_t)0x08006000)
#define BANK0_WRITE_END_ADDR    ((uint32_t)0x08008000)

int main(void)
{
    /* initialize led on the board */
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);

    /* unlock the flash program/erase controller */
    fmc_unlock();
    ob_unlock();

    fmc_flag_clear(FMC_FLAG_BANK0_END);
    fmc_flag_clear(FMC_FLAG_BANK0_WPERR);
    fmc_flag_clear(FMC_FLAG_BANK0_PGERR);

    /* Get pages write protection status */
    wp_value = ob_write_protection_get();

#ifdef WRITE_PROTECTION_DISABLE
    /* Get pages already write protected */
    protected_pages = ~(wp_value | FMC_PAGES_PROTECTED);
  
    /* Check if desired pages are already write protected */
    if((wp_value | (~FMC_PAGES_PROTECTED)) != 0xFFFFFFFF ){
        /* Erase all the option Bytes */
        fmc_state = ob_erase();

        fmc_flag_clear(FMC_FLAG_BANK0_END);
        fmc_flag_clear(FMC_FLAG_BANK0_WPERR);
        fmc_flag_clear(FMC_FLAG_BANK0_PGERR);

        /* Check if there is write protected pages */
        if(protected_pages != 0x0){
            /* Restore write protected pages */
            fmc_state = ob_write_protection_enable(protected_pages);
        }
        /* Generate System Reset to load the new option byte values */
        NVIC_SystemReset();
    }

#elif defined WRITE_PROTECTION_ENABLE
    /* Get current write protected pages and the new pages to be protected */
    protected_pages =  (~wp_value) | FMC_PAGES_PROTECTED; 

    /* Check if desired pages are not yet write protected */
    if(((~wp_value) & FMC_PAGES_PROTECTED )!= FMC_PAGES_PROTECTED){

        /* Erase all the option Bytes because if a program operation is 
        performed on a protected page, the Flash memory returns a 
        protection error */
        fmc_state = ob_erase();

        fmc_flag_clear(FMC_FLAG_BANK0_END);
        fmc_flag_clear(FMC_FLAG_BANK0_WPERR);
        fmc_flag_clear(FMC_FLAG_BANK0_PGERR);

        /* Enable the pages write protection */
        fmc_state = ob_write_protection_enable(protected_pages);

        /* Generate System Reset to load the new option byte values */
        NVIC_SystemReset();
    }
#endif /* WRITE_PROTECTION_DISABLE */

#ifdef FLASH_PAGE_PROGRAM
    /* Get the number of pages to be erased */
    page_num = (BANK0_WRITE_END_ADDR - BANK0_WRITE_START_ADDR) / FLASH_PAGE_SIZE;

    /* The selected pages are not write protected */
    if((wp_value & FMC_PAGES_PROTECTED) != 0x00){
        /* Clear All pending flags */
        fmc_flag_clear(FMC_FLAG_BANK0_END);
        fmc_flag_clear(FMC_FLAG_BANK0_WPERR);
        fmc_flag_clear(FMC_FLAG_BANK0_PGERR);

        /* erase the FLASH pages */
        for(erase_counter = 0; (erase_counter < page_num) && (fmc_state == FMC_READY); erase_counter++){
            fmc_state = fmc_page_erase(BANK0_WRITE_START_ADDR + (FLASH_PAGE_SIZE * erase_counter));
        }

        fmc_flag_clear(FMC_FLAG_BANK0_END);
        fmc_flag_clear(FMC_FLAG_BANK0_WPERR);
        fmc_flag_clear(FMC_FLAG_BANK0_PGERR);

        /* FLASH Half Word program of data 0x1753 at addresses defined by BANK1_WRITE_START_ADDR and BANK1_WRITE_END_ADDR */
        Address = BANK0_WRITE_START_ADDR;

        while((Address < BANK0_WRITE_END_ADDR) && (fmc_state == FMC_READY)){
            fmc_state = fmc_halfword_program(Address, data);
            Address = Address + 2;
        }

        /* Check the correctness of written data */
        Address = BANK0_WRITE_START_ADDR;

        while((Address < BANK0_WRITE_END_ADDR) && (program_state != FAILED)){
            if((*(__IO uint16_t*) Address) != data){
                program_state = FAILED;
            }
            Address += 2;
        }
        gd_eval_led_on(LED2);
    }
    else{
        /* Error to program the flash : The desired pages are write protected */
        program_state = FAILED;
        gd_eval_led_on(LED3);

    }
#endif /* FLASH_PAGE_PROGRAM */
    while(1){
    }
}

代码讲解

中断优先级配置：NVIC 设置中断的抢占优先级和子优先级。数字越小优先级越高。

Write_Protection on CLing

GD32 FMC — Flash 写保护

FMC — Flash 写保护

功能简介

完整代码

代码讲解