STM32 Flash 擦除HAL_FLASHEx_Erase()无法将字节恢复为 0xFF

patch1582 提问时间：2026-7-29 14:48 / 未解决

问答
是否解决:	未解决

我在 STM32L476RET6 上遇到无法擦除指定 Flash 页。调用HAL_FLASHEx_Erase()返回HAL_OK，看似擦除成功，但使用 STM32CubeProgrammer 读取目标地址，数据并没有被擦除成的 0xFF。故障相关代码：

HAL_StatusTypeDef set_update_flag(void) { // Unlock the Flash to enable the flash control register access HAL_StatusTypeDef status = HAL_FLASH_Unlock(); if (status != HAL_OK) { // Unlock failed, handle accordingly return status; } // Define the page and bank for the erase operation FLASH_EraseInitTypeDef EraseInitStruct; uint32_t PageError = 0; EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES; EraseInitStruct.Banks = FLASH_BANK_1; EraseInitStruct.Page = 255; // Targeting the last page for the erase operation EraseInitStruct.NbPages = 1; // Erase the page status = HAL_FLASHEx_Erase(&EraseInitStruct, &PageError); if (status != HAL_OK) { // Erase failed, handle accordingly HAL_FLASH_Lock(); // Make sure to lock the flash again before returning return status; } // Set the update flag to 1 status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, UPDATE_FLAG_ADDRESS, 0x0000000100000001); if (status != HAL_OK) { // Program failed, handle accordingly HAL_FLASH_Lock(); // Make sure to lock the flash again before returning return status; } HAL_FLASH_Lock(); // Lock the Flash to disable the flash control register access return HAL_OK; } 擦除函数无报错返回HAL_OK，但PageError变量值为0xFFFFFFFF。后续调用HAL_FLASH_Program()写入数据直接返回错误。该功能之前运行正常，现在失效。已经页编号、确认 Flash 解锁流程正常，函数出口也执行 Flash 上锁。