读取温度C值出现ACCERR

[OliverChen]

读取NVR中的温度C值出现了ACCERR，这个可能啥原因导致的？

static uint32_t SafMgrUser_ReadOptNvr(uint32_t Address)
{
    uint32_t u32Data = 0U;
    
    /* Step 0: Wait for IDLE flag to be set */
    while (0U == (EFM->STS & (EFM_STS_IDLE_MASK)))
    {
        /* wait */
    }

    /* Enter Fls critical section to prevent concurrent EFM access */
    SchM_Enter_Fls_FLS_EXCLUSIVE_AREA_07();
    
    /* Add NOP command to clear write buffer */
    EFM->CMD = 0;

    /* Step 1: Clear error status of EFM STS register */
    EFM->STS = EFM_STS_FAIL_MASK |
                EFM_STS_ACCERR_MASK |
                EFM_STS_UNRECOVERR_MASK |
                EFM_STS_RECOVERR_MASK |
                EFM_STS_DONE_MASK;
    
#if (PLATFORM_MPU_CFG == STD_ON)
    ARM_MPU_Disable();
#endif

    /* Step 2: Set the address that needs to be read in the NVR_ADDR register */
    EFM->NVR_ADDR = Address;
    
#if (PLATFORM_MPU_CFG == STD_ON)
    ARM_MPU_Enable(MPU_CTRL_PRIVDEFENA_Msk);
#endif

    /* Step 3: Write 0xFD9573F5 to CMD_UNLOCK to unlock the command */
    EFM->CMD_UNLOCK = 0xFD9573F5U;

    /* Step 4: Set Read NVR command (0x42) in CMD register */
    EFM->CMD = 0x42U;
    
    /* Exit Fls critical section */
    SchM_Exit_Fls_FLS_EXCLUSIVE_AREA_07();
    
    /* Step 5: Wait for DONE flag to be set */
    while (0U == (EFM->STS & (EFM_STS_DONE_MASK)))
    {
        /* wait */
    }    

    /* Step 6: Read NVR_DATA0 and NVR_DATA1 */
    if (0U == (EFM->STS & EFM_STS_ACCERR_MASK))
    {
        u32Data = EFM->NVR_DATA[0];
        /* NVR_DATA[1] also available if needed */
    }

    return u32Data;
}

[Diga]

读的哪个地址时候出错的

[OliverChen]

Diga 0x100103f8UL

[swust]

操作之前关一下全局中断呢

[OliverChen]

swust 代码在1L，使用了SchM_Enter_Fls_FLS_EXCLUSIVE_AREA_07这个接口，应该是关了

[tx007007]

从你的NVR_addr来看是0地址，可能传参出问题了，你这里改成绝对地址或者把传参的变量搞成全局看看

[OliverChen]

tx007007 这个估计是因为断点打的位置在Step6。实际上DATA0是能读到C值的，但是就是会出这个错误。我是直接使用的SafMgrUser_ReadOptNvr(0x100103f8UL)读取的。

[tx007007]

要不你拉个会议，远程给你看一下，看能不能找到原因

[OliverChen]

tx007007 可以

[OliverChen]

tx007007 点击链接直接加入会议：
https://meeting.tencent.com/dm/wr7sc3E5Bq4h

#腾讯会议：751-895-963