根据手册取了三个地址：
uint8_t buf[12];
uint32_t uuid[3];
uint32_t code;
uuid[0] = *(__IO uint32_t*) (0x1FFFF7E8);
uuid[1] = *(__IO uint32_t*) (0x1FFFF7EC);
uuid[2] = *(__IO uint32_t*) (0x1FFFF7F0);
code = uuid[0];
buf[0] = (uint8_t) code;
buf[1] = (uint8_t) (code >> 8);
buf[2] = (uint8_t) (code >> 16);
buf[3] = (uint8_t) (code >> 24);
code = uuid[1];
buf[4] = (uint8_t) code;
buf[5] = (uint8_t) (code >> 8);
buf[6] = (uint8_t) (code >> 16);
buf[7] = (uint8_t) (code >> 24);
code = uuid[2];
buf[8] = (uint8_t) code;
buf[9] = (uint8_t) (code >> 8);
buf[10] = (uint8_t) (code >> 16);
buf[11] = (uint8_t) (code >> 24);
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第三个【0x1FFFF7F0】这里面的地址都是 FF 的吗？这个代码获取出来后：
buf[0-7]是有值的，但buf[8-11]都是 0xFF 。
请问第三个地址正常的吗？还是我用错了？
