本文来简要介绍一下如何在EB中配置AUTOSAR Fls和Fee模块。Fls模块是Flash的驱动，执行具体的Flash擦写读取等操作。Fee模块的全称是FlashEEPROMEmulation，即Flash模拟EEPROM，是为了解决Flash擦写寿命比较短的问题，通过算法实现各个Flash块的交替擦写，以延长寿命。

1. Fls

（1）FlashSector（扇区）

Fls模块中最重要的一点就是配置FlsSector，如下图所示，一共配置了8个Sector，每个Sector可以选择对应的Flash物理扇区，配置好后，这几个Sector就会被用来模拟EEPROM。S32K1XX系列芯片带有专门用来存储数据的Flash——FlexNVM，地址从0x10000000处开始。每个扇区的大小是2K。

（2）回调函数

注意结合Fee模块一起使用的时候，要配置以下两个回调函数，否则数据存储会有问题：

2. Fee

Fee模块是基于Fls模块的，不可单独使用。

配置Fee时首先要配置Fee Cluster，每个Cluster可以包含一个以上的FlashSector。

Cluster越多，Flash的平均擦写次数越少；每个Cluster包含的Sector越多，能够同时存储的数据量越大。
（上面是我初步分析的，大家有不同的看法可以交流一下，互相学习）

配置完Cluster之后就可以配置Block了，如下图所示，每个Block有一个唯一的序号——BlockNumber，作为该Block的索引，用于写入数据和读取数据。写入数据时要整个Block一起写入，读取的时候可以指定偏移量和数据长度，读取该Block中某个地址处的某几个字节数据。

每个Block可以分别配置大小，即可存储的数据长度。

如果结合Nvm模块一起使用的话，要配置下面两个回调函数：

再注意一下Fee Buffer Size这个概念，可以参考下面的注释，简单说就是Buffersize越大性能越好。

3. 测试代码

下面的测试代码参考了NXP官方提供的Mcal Sample中的代码。

创建一个Task，每100ms调度一次，代码如下：

static CONST (uint8, AUTOMATIC) FeeTest_WriteBuff[32]={0x55,0xAA,0x55,0xAA,0x55,0xAA,0x55,0xAA,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x55,0xAA,0x55,0xAA,0x55,0xAA,0x55,0xAA};
static VAR (uint8, AUTOMATIC)  FeeTest_ReadBuff[32]={0};TASK( OsTask_FeeTest )
{volatile StatusType status;                 /* variable to check system status */Std_ReturnType stdRet = E_NOT_OK;MemIf_StatusType memif_status;memif_status = Fee_GetStatus();/* state-machine logic */switch(FeeState){case FEE_ERASE_STATE:{if (MEMIF_IDLE == memif_status){stdRet = Fee_EraseImmediateBlock(FeeBankIdx);if (stdRet != E_OK){
//                    CONSOLE_MESSAGE("FEE Error %d returned by Fee_EraseImmediateBlock()", stdRet);Can_PduInfo_0_0.sdu[0] = 0x01;/*CONSOLE_MESSAGE("FEE state-machine state:%d", FeeState);*/FeeState = FEE_ERROR_STATE;}else{/* change the state */FeeState = FEE_ERASE_BUSY_STATE;Can_PduInfo_0_0.sdu[0] = 0x00;stdRet = E_OK;}}else{stdRet = E_OK;}}break;case FEE_ERASE_BUSY_STATE:if (MEMIF_IDLE == memif_status){FeeState = FEE_WRITE_STATE;}stdRet = E_OK;break;case FEE_WRITE_STATE:{if (MEMIF_IDLE == memif_status){stdRet = Fee_Write(FeeBankIdx, (uint8 *)FeeTest_WriteBuff);if (stdRet != E_OK){
//                    CONSOLE_MESSAGE("FEE Error returned by Fee_Write()", stdRet);Can_PduInfo_0_0.sdu[0] = 0x02;/*CONSOLE_MESSAGE("FEE state-machine state:", FeeState);*/FeeState = FEE_ERROR_STATE;}else{/* change the state */FeeState = FEE_WRITE_BUSY_STATE;stdRet = E_OK;}}else{stdRet = E_OK;}}break;case FEE_WRITE_BUSY_STATE:if (MEMIF_IDLE == memif_status){FeeState = FEE_READ_STATE;}stdRet = E_OK;break;case FEE_READ_STATE:{if (MEMIF_IDLE == memif_status){stdRet = Fee_Read(FeeBankIdx, 0, FeeTest_ReadBuff, 32u);if (stdRet != E_OK){
//                    CONSOLE_MESSAGE("FEE Error %d returned by Fee_Read()", stdRet);Can_PduInfo_0_0.sdu[0] = 0x03;/*CONSOLE_MESSAGE("FEE state-machine state:", FeeState);*/FeeState = FEE_ERROR_STATE;}else{/* change the state */FeeState = FEE_READ_BUSY_STATE;}}else{stdRet = E_OK;}}break;case FEE_READ_BUSY_STATE:if (MEMIF_IDLE == memif_status){FeeState = FEE_VALIDATE_STATE;}stdRet = E_OK;break;case FEE_VALIDATE_STATE:{/* compare the read FeeTest_WriteBuffer with the written one */stdRet = SampleAppFee_memcmp((uint8 *)FeeTest_WriteBuff, FeeTest_ReadBuff, 32u);if (stdRet != E_OK){Can_PduInfo_0_0.sdu[0] = 0x04;
//                CONSOLE_MESSAGE("FEE Error %d returned by SampleAppFee_memcmp()", stdRet);/*CONSOLE_MESSAGE("FEE state-machine state:%d", FeeState);*/FeeState = FEE_READ_ERROR_STATE;
//                CONSOLE_MESSAGE("Fee task READ ERROR!", 0);}else{/* change the state */FeeState = FEE_FINAL_STATE;Can_PduInfo_0_0.sdu[0] = 0xFF;if(FeeBankIdx < 4){FeeBankIdx++;FeeState = FEE_ERASE_STATE;}
//                CONSOLE_MESSAGE("Fee task ended OK.", 0);}}break;case FEE_ERROR_STATE:{}/*break;*/default:{/* if we got here, something went terribly wrong*/stdRet = E_NOT_OK;}break;}status = TerminateTask();
}

在main函数中初始化Fls和Fee模块：

	……Fls_Init(&FlsConfigSet_0);Fee_Init();FeeState = FEE_ERASE_STATE;FeeBankIdx = 1;StartOS( Mode01 );                            /* jump to OS startup */

在一个5ms为周期的函数中调用两个模块的主调度函数：

TASK( OsTask_5ms )
{volatile StatusType status;                 /* variable to check system status */……Fls_MainFunction();Fee_MainFunction();status = TerminateTask( );
}

即可完成4个Fee Block的简单测试。

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