AUTOSAR —— S32K144 的 Fls 和 Fee 模块配置
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。