OTP写数据失败，提示写保护

kid0607

读写OTP区域，按照中文手册先写00到BLOCK0的LOCK位，再写BLOCK

读LOCK位发现已经成功清0，但是读BLOCK发现没能成功写入，读到全F，追踪代码 写入OTP数据后 FLASH->SR 的FLASH_FLAG_WRPERRbit为1 ，即写保护  

请教下:

1,为何写保护?   查看手册，写保护原因以下

[mw_shl_code=c,true]If a program operation is requested, the WRPERR bit is set when: ? A write operation is performed on system memory or on the reserved part of the user specific sector. ? A write operation is performed to the user configuration sector ? A write operation is performed on a sector write protected by option bit. ? A write operation is requested on an OTP area which is already locked ? The Flash memory is read protected and an intrusion is detected.[/mw_shl_code]

第一/二/三条不符合， 第四条我已经清0。第五条不太明白，但是我可以写LOCK位，不能写OTP BLOCK，似乎也不像是这原因。

2,应当如何正确操作

代码如下

[mw_shl_code=c,true]#define OTP_BLOCK_BASE 0x1FFF7800 #define OTP_LOCK_BASE 0x1FFF7A00 STMFLASH_Write(OTP_LOCK_BASE,0x00000000,1); STMFLASH_Write(OTP_BLOCK_BASE,0x1a2b3f4d,1);// 没写成功 STMFLASH_Read(OTP_LOCK_BASE,(u32*)datatemp,1);//读到0 之前读是0xffffffff说明成功了 STMFLASH_Read(OTP_BLOCK_BASE,(u32*)datatemp,1);//一直是0xffffffff SR的写保护有问题 [/mw_shl_code]

  移植的原子大神的代码，大家帮忙看看哈

kid0607

英文不好被调戏了,0xff可写，0x00上锁。

Each OTP data block can be programmed until the value 0x00 is programmed in the corresponding
OTP lock byte.