GD32写FLASH写不进去如何关掉写保护

只看该作者 · 2018-9-21 09:57

保存一些数据到FLASH里面，实验得到是写保护开了，写不进去
如何把GD32的写保护关掉

            FMC_OB_Unlock();
            FMC_OB_EnableWRP(WRP_SECTOR0);       // 0块写保护，其它地方不保护
            FMC_OB_Lock();

我是这样操作的，不成功.数据还是写不进去

只看该作者 · 2018-9-21 16:04

本帖最后由高IAI阳于 2018-9-21 16:37 编辑

可选字节块解锁属于二次解锁，解锁之前需要先进行一次解锁。具体还要看芯片种类，另外对flash较低的地址写保护，会导致程序无法下载到flash的情形。

上图是307的FMC保护和擦除操作，去除编程保护需要擦除选项字节，同时需要系统复位才能生效。

只看该作者 · 2018-9-27 21:14

参考你所选器件的 EXAMPLE 里面基本都会有的！

只看该作者 · 2018-10-1 19:19

lvben5d 发表于 2018-9-27 21:14
参考你所选器件的 EXAMPLE 里面基本都会有的！

EXAMPLE 不知道哪里找

只看该作者 · 2018-10-1 21:00

lvben5d 发表于 2018-9-27 21:14
参考你所选器件的 EXAMPLE 里面基本都会有的！

按你说的，找到了。非常感谢提醒

/**
  ******************************************************************************
  * @brief Main program body
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "gd32f1x0.h"
#include "gd32f1x0_gpio.h"
#include "gd32f1x0_eval.h"

/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;

/* Private define ------------------------------------------------------------*/
#define BufferSize                2048

#define FMC_PAGE_SIZE             ((uint16_t)0x400)
#define FMC_PAGES_PROTECTED       (WRP_SECTOR4)

#define BANK1_WRITE_START_ADDR    ((uint32_t)0x08004000)
#define BANK1_WRITE_END_ADDR       ((uint32_t)0x08004800)

/* Private function prototypes -----------------------------------------------*/
void LED_config(void);

/* Private variables ---------------------------------------------------------*/
uint32_t m2m = 0,m2u =0;
__IO TestStatus TransferStatus = FAILED;

uint32_t *ptrd;
uint32_t WriteProtected_Value = 0xFFFFFFFF, ProtectedPages = 0x0;
uint32_t EraseCounter = 0x00, Address = 0x00;
uint32_t Data = 0x1234ABCD;
__IO uint32_t NbrOfPage = 0x00;
volatile FMC_State FMCStatus = FMC_READY;
volatile TestStatus MemoryProgramStatus = PASSED;

/* Uncomment this line to program the Falsh pages */
#define FMC_PAGE_PROGRAM

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
uint32_t i;
TransferStatus = PASSED;

GD_EVAL_LEDInit(LED1);
GD_EVAL_LEDInit(LED2);
GD_EVAL_LEDInit(LED3);
GD_EVAL_LEDInit(LED4);

/* Unlock the Flash Bank1 Program Erase controller */
FMC_Unlock();

FMC_OB_Unlock();

/* Clear All pending flags */
FMC_ClearBitState(FMC_FLAG_EOP | FMC_FLAG_WERR | FMC_FLAG_PERR );

/* Get status of pages write protection */
WriteProtected_Value = FMC_OB_GetWRP();

#ifdef WRITE_PROTECTION_DISABLE

/* Get write protected pages */
ProtectedPages = ~(WriteProtected_Value | FMC_PAGES_PROTECTED);

/* Check whether the specified pages is write protected  */
if((WriteProtected_Value | (~FMC_PAGES_PROTECTED)) != 0xFFFFFFFF)
{
      /* Erase all the option Bytes */
      FMCStatus = FMC_OB_Erase();

      /* Check if other pages write protected */
      if(ProtectedPages != 0x0)
      {
         /* Restore other pages write protected */
         FMCStatus = FMC_OB_EnableWRP(ProtectedPages);
      }
      /* Generate a system reset to reload the option byte */
      FMC_OB_Reset();
}

#elif defined WRITE_PROTECTION_ENABLE
/* Get already write protected pages and the new specified pages to be protected */
ProtectedPages =  (~WriteProtected_Value) | FMC_PAGES_PROTECTED;

/* Check whether the specified pages is write protected */
if(((~WriteProtected_Value) & FMC_PAGES_PROTECTED )!= FMC_PAGES_PROTECTED)
{
      FMCStatus = FMC_OB_Erase();

      /* Enable the pages write protection */
      FMCStatus = FMC_OB_EnableWRP(ProtectedPages);

      /* Generate a system reset to reload the option byte */
      FMC_OB_Reset();
}
#endif

#ifdef FMC_PAGE_PROGRAM

/* Define the number of page to be erased */
NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FMC_PAGE_SIZE;

/* Erase the FLASH pages */
for(EraseCounter = 0; EraseCounter < NbrOfPage; EraseCounter++)
{
      FMCStatus = FMC_ErasePage(BANK1_WRITE_START_ADDR + (FMC_PAGE_SIZE * EraseCounter));
      FMC_ClearBitState(FMC_FLAG_EOP | FMC_FLAG_WERR | FMC_FLAG_PERR );
}

FMC_Lock();

ptrd = (uint32_t*)BANK1_WRITE_START_ADDR;

for(i = 0; i < 512; i++)
{
      if(*ptrd != 0xFFFFFFFF)
      {
         TransferStatus = FAILED;
         break;
      }
      else
      {
         ptrd++;
      }
}

/* Unlock the Flash Bank1 Program Erase controller */
FMC_Unlock();

/* Program Flash Bank1 */
Address = BANK1_WRITE_START_ADDR;

while(Address < BANK1_WRITE_END_ADDR)
{
      FMCStatus = FMC_ProgramWord(Address, Data);
      Address = Address + 4;
      FMC_ClearBitState(FMC_FLAG_EOP | FMC_FLAG_WERR | FMC_FLAG_PERR );
}

FMC_Lock();

ptrd = (uint32_t*)BANK1_WRITE_START_ADDR;

for(i = 0; i < 512; i++)
{
      if(*ptrd == 0xFFFFFFFF)
      {
         TransferStatus = FAILED;
         break;
      }
      else
      {
         ptrd++;
      }
}

if(TransferStatus == FAILED)
{
      GD_EVAL_LEDOn(LED1);
      GD_EVAL_LEDOff(LED2);
      GD_EVAL_LEDOn(LED3);
      GD_EVAL_LEDOff(LED4);
}
else
{
      GD_EVAL_LEDOff(LED1);
      GD_EVAL_LEDOn(LED2);
      GD_EVAL_LEDOff(LED3);
      GD_EVAL_LEDOn(LED4);
}
#endif
while(1)
{
}
}

GD32写FLASH写不进去 如何关掉写保护

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GD32写FLASH写不进去如何关掉写保护