f429-阿波罗的nand例程，测试下来写的速度比读快，不知是什么问题？

改个名字 · 发表于 2020-3-10 19:21:04

测试方法：使用 systick 时钟计时，记录写一个 page 的时间和读一个 page 的时间。分别测试100次，最后统计平均值。

测试结果：
write test 100 times
CPU: 180 MHz
Average time: 269.161 us
Maximum time: 399.188 us
Minimum time: 243.300 us

read test 100 times
CPU: 180 MHz
Average time: 296.327 us
Maximum time: 399.188 us
Minimum time: 243.300 us

不知有没有论坛大神做过这个测试。

改个名字 · 发表于 2020-3-10 19:26:58

本帖最后由改个名字于 2020-3-10 19:29 编辑

这是读写 page 的代码

u8 NAND_ReadPage(u32 PageNum,u16 ColNum,u8 *pBuffer,u16 NumByteToRead)
{
vu16 i=0;
u8 res=0;
u8 eccnum=0;
u8 eccstart=0;
u8 errsta=0;
u8 *p;
*(vu8*)(NAND_ADDRESS|NAND_CMD)=NAND_AREA_A;
//·￠ËíμØÖ·
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)ColNum;
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)(ColNum>>8);
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)PageNum;
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)(PageNum>>8);
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)(PageNum>>16);
*(vu8*)(NAND_ADDRESS|NAND_CMD)=NAND_AREA_TRUE1;
res=NAND_WaitRB(0); //μè′yRB=0
if(res)return NSTA_TIMEOUT;
res=NAND_WaitRB(1); //μè′yRB=1
if(res)return NSTA_TIMEOUT; //3¬ê±íË3ö
if(NumByteToRead%NAND_ECC_SECTOR_SIZE)
{
//¶áè¡NAND FLASHÖDμÄÖμ
for(i=0;i<NumByteToRead;i++)
{
*(vu8*)pBuffer++ = *(vu8*)NAND_ADDRESS;
}
}else
{
eccnum=NumByteToRead/NAND_ECC_SECTOR_SIZE; //μÃμ½ecc¼ÆËã′Îêy
eccstart=ColNum/NAND_ECC_SECTOR_SIZE;
p=pBuffer;
for(res=0;res<eccnum;res++)
{
FMC_Bank2_3->PCR3|=1<<6; //ê1ÄüECCD￡Ñé
for(i=0;i<NAND_ECC_SECTOR_SIZE;i++) //¶áè¡NAND_ECC_SECTOR_SIZE¸öêy¾Y
{
*(vu8*)pBuffer++ = *(vu8*)NAND_ADDRESS;
}
while(!(FMC_Bank2_3->SR3&(1<<6))); //μè′yFIFO¿Õ
nand_dev.ecc_hdbuf[res+eccstart]=FMC_Bank2_3->ECCR3;//¶áè¡ó2¼t¼ÆËãoóμÄECCÖμ
FMC_Bank2_3->PCR3&=~(1<<6); //½ûÖ1ECCD￡Ñé
}
i=nand_dev.page_mainsize+0X10+eccstart*4; //′óspareÇøμÄ0X10Î»ÖÃ¿aê¼¶áè¡Ö®Ç°′æ′￠μÄeccÖμ
NAND_Delay(30);//μè′ytADL
*(vu8*)(NAND_ADDRESS|NAND_CMD)=0X05; //Ëæ»ú¶áÖ¸áî
//·￠ËíμØÖ·
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)i;
*(vu8*)(NAND_ADDRESS|NAND_ADDR)=(u8)(i>>8);
*(vu8*)(NAND_ADDRESS|NAND_CMD)=0XE0; //¿aê¼¶áêy¾Y
NAND_Delay(30);//μè′ytADL
pBuffer=(u8*)&nand_dev.ecc_rdbuf[eccstart];
for(i=0;i<4*eccnum;i++) //¶áè¡±￡′æμÄECCÖμ
{
*(vu8*)pBuffer++= *(vu8*)NAND_ADDRESS;
}
for(i=0;i<eccnum;i++) //¼ìÑéECC
{
if(nand_dev.ecc_rdbuf[i+eccstart]!=nand_dev.ecc_hdbuf[i+eccstart])//2»Ïàμè,DèòaD￡Õy
{
printf("err hd,rd:0x%x,0x%x\r\n",nand_dev.ecc_hdbuf[i+eccstart],nand_dev.ecc_rdbuf[i+eccstart]);
printf("eccnum,eccstart:%d,%d\r\n",eccnum,eccstart);
printf("PageNum,ColNum:%d,%d\r\n",PageNum,ColNum);
res=NAND_ECC_Correction(p+NAND_ECC_SECTOR_SIZE*i,nand_dev.ecc_rdbuf[i+eccstart],nand_dev.ecc_hdbuf[i+eccstart]);//ECCD￡Ñé
if(res)errsta=NSTA_ECC2BITERR; //±ê¼Ç2BIT¼°òÔéÏECC′íÎó
else errsta=NSTA_ECC1BITERR; //±ê¼Ç1BIT ECC′íÎó
}
}
}
if(NAND_WaitForReady()!=NSTA_READY)errsta=NSTA_ERROR; //ê§°ü
return errsta; //3é1|
}