一，初始化 int BackupSRAM_Init(void){ RCC->AHB4ENR |= 1 << 28; PWR->CR1 |= 1<<8; (RCC->D3AMR) |= (RCC_D3AMR_BKPRAMAMEN); RCC->AHB4ENR |= 1<<28; PWR->CR2 |= 1; return 1;} 二，使用 uint8_t backup_buf[4096] __attribute__((at(D3_B
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