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SPI FLASH problem

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Linas

Sun Jul 21 2013, 11:17AM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

Hello, i am making ADSP FLASH programmer, all stuff is done, now flash programing stooping me from succeeding

STM32F4 is connected via SPI1 to flash. I can read ID from flash ( and yes, it is perfect match in pdf), and read status register, and write status register. so my guess SPI bus is ok.
But i can't write, and read any data.
ok, first what i do, is set register to 0x00 ( aka write protection is disabled)

sFLASH_WriteEnable();
sFLASH_CS_LOW();
sFLASH_SendByte(0x01);
sFLASH_SendByte(0x00);

nest i do all flash erase
void sFLASH_EraseBulk(void)
{
/*!< Send write enable instruction */
sFLASH_WriteEnable();
/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();
/*!< Send Bulk Erase instruction */
sFLASH_SendByte(sFLASH_CMD_BE);
/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();
/*!< Wait the end of Flash writing */
sFLASH_WaitForWriteEnd();
}

writing data like this:
int i = 0;
while(i<256)
{
sFLASH_Write_Char(i,i);
i++;
}

void sFLASH_Write_Char(uint8_t data, uint32_t ReadAddr)
{
sFLASH_CS_LOW();

sFLASH_SendByte(sFLASH_CMD_WRITE);

sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);

sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);

sFLASH_SendByte(ReadAddr & 0xFF);

SPI_I2S_SendData(sFLASH_SPI, data);

sFLASH_CS_HIGH();

sFLASH_WaitForWriteEnd();
}

Do i mist something ?

Erlend^SE

Sun Jul 21 2013, 08:49PM

Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159

Maybe you could tell what flash chip?

programming voltage?

How do you know you can't read/write data?

Linas

Sun Jul 21 2013, 09:12PM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

Erlend^SE wrote ...

Maybe you could tell what flash chip?
programming voltage?
How do you know you can't read/write data?

it should work on 3.3v
void sFLASH_Read(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
sFLASH_CS_LOW();

sFLASH_SendByte(0x03);
sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);

sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);

sFLASH_SendByte(ReadAddr & 0xFF);

while (NumByteToRead--)
{
*pBuffer =sFLASH_SendByte(sFLASH_DUMMY_BYTE); //sFLASH_SendByte(sFLASH_DUMMY_BYTE);
pBuffer++;
}
sFLASH_CS_HIGH();
}

void sFLASH_Write_Char(uint8_t data, uint32_t ReadAddr)
{
sFLASH_CS_LOW();

sFLASH_SendByte(0x06);

sFLASH_CS_HIGH();

sFLASH_CS_LOW();

sFLASH_SendByte(0x02);

sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);

sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);

sFLASH_SendByte(ReadAddr & 0xFF);

SPI_I2S_SendData(sFLASH_SPI, data);

sFLASH_CS_HIGH();

}

i do bulk erase. Than set status registers to zeros. and write simple countng up data., when i try to read it, i can't find any data, just FF

Conundrum

Mon Jul 22 2013, 07:43AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061

Indadequate voltage?
Also worth checking, pull-up resistors and timing; if the signals are not square then the chip might not be inputting the data correctly.

-A

Linas

Mon Jul 22 2013, 08:06AM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

Conundrum wrote ...

Indadequate voltage?
Also worth checking, pull-up resistors and timing; if the signals are not square then the chip might not be inputting the data correctly.

I hape pullup to CS,WP,HD, and using PP Output in mcu, and i have local DC/DC to 3.30V.Somehow i can read chip id, but if i try to write data, i read nothing.
(Or, i don't know how to read, or how to write)
probing show excellent timings

As always, if i made hardware right, software start to not work, and vice versa

lol, changed flash to EPCS4 and it worked in first time.
So i ordered new flash, and problem should be solved.

Erlend^SE

Mon Jul 22 2013, 05:38PM

Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159

Check the other chip again, maybe it needs some programming voltage (around 12V?)

It's always a good idea to tell the name of the part that doesn't work/seem to work.

Linas

Mon Jul 22 2013, 05:51PM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

Erlend^SE wrote ...

Check the other chip again, maybe it needs some programming voltage (around 12V?)

It's always a good idea to tell the name of the part that doesn't work/seem to work.

Linas

Wed Jul 24 2013, 09:22AM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

OK, i realy ned some one who knows how to work with SPI FLASH.
Right now i am using EPCS16 from my fpga board.

If i delete sector, and fill with data, i can read it with no problem. But if i try just to read flash from power-up,i get void data. (Yes, flash was programed, but not deleted)

Same problem is with dsp booting, i don't get any activity from MISO pi, only high state, and yes was successfully write.

To write flash i use simple function, so no error can be write into flash:
while( TransferStatus == FAILED)
{
sFLASH_EraseSector(sk);
sFLASH_WriteBuffer(Tx_Buffer,sk,256);
sFLASH_ReadBuffer(Rx_Buffer, sk, 256);
TransferStatus = Buffercmp(Tx_Buffer, Rx_Buffer, 256);//return PASSED if Rx and Tx data is the same, sk is address
}
TransferStatus=FAILED; //so next time when i have full buffer, i will go to this loop

Do i missing something ? do i need to write some registers or what ? why if i execute page delete and fill it with data i can read it, but if i try just to read after powerup (and some delay), i get nothing ?

Steve Conner

Wed Jul 24 2013, 10:41AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I deal with problems like this all the time at work. The solution is lots of hard work with a scope and logic analyser plus reading the datasheets of all the parts 100 times. (including any errata that the manufacturer might have published later)

Even if the flash was full of garbage data, or blank, or not connected at all, I'd expect the DSP to attempt to read it at boot time. It should clock in the first 1000 or so words, try to execute it as code, and if the data is bad it will crash at this point.

So it sounds like you have two problems here: your flash write routine on the STM32 is broken and your DSP boot mode is configured wrongly. (or it's not trying to boot because it's lacking some power rail or clock signal)

The EPCS16 is meant for configuring Altera FPGAs. Is it even compatible with the DSP's SPI bootloader?

Finally I noticed this in the EPCS series datasheet:

wrote ...
For write and erase operations, drive the nCS pin high at a byte boundary that is in a
multiple of eight clock pulses. Otherwise, the operation is rejected and not executed.

Linas

Wed Jul 24 2013, 12:26PM

Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721

OK, this is just me beeing stupid as always.
I was writing to buffer, not page, and when i switched to page, and after chip erase setting all registers to zero, worked as it should. So yes, you must know your enemy.

Anyway, ADSP-21488 still doesn't want to work, i can see now some activity on all pins (MOSI give just read command as it should, and MISO just readouts all data from flash, cs goes low for eternity)

Is always fun to start to work from hardest point with new technology... (ADSP i mean)

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