Hard Fault Error - STM32F100C8

ezyreach · ‎2011-06-27

Posted on June 27, 2011 at 12:34

I am trying to implement EEPROM emulation in the flash memory. I am able to write and read the data from flash. When trying to write the second data it is going to HARDFAULT Error. I m not sure why this happens.

Below is the code....

void Write_Data(uint32_t Address,uint16_t *Data,uint16_t Len)

{

uint8_t Temp_RdLen=0;

uint16_t i=0;

uint16_t RdLen=0;

FLASH_UnlockBank1();

Flash Bank1 Program Erase controller */

NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR)

/FLASH_PAGE_SIZE;

FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR |

FLASH_FLAG_WRPRTERR);

for(EraseCounter = 0; (EraseCounter < NbrOfPage) && (FLASHStatus ==

FLASH_COMPLETE); EraseCounter++)

{

FLASHStatus = FLASH_ErasePage(BANK1_WRITE_START_ADDR +

(FLASH_PAGE_SIZE * EraseCounter));

}

while(Address < BANK1_WRITE_END_ADDR&& MemoryProgramStatus !=

FAILED)

{

RdLen = (*(__IO uint32_t*)Address);

Temp_RdLen=(uint8_t)(RdLen>>8);

break;

}

if(Temp_RdLen == 0xFF)

{

while((Address < BANK1_WRITE_END_ADDR) && (FLASHStatus ==

FLASH_COMPLETE))

{

FLASHStatus = FLASH_ProgramHalfWord(Address, Len);

Address+=2;

break;

}

while((Address < BANK1_WRITE_END_ADDR) && (FLASHStatus ==

FLASH_COMPLETE)&& i<Len)

{

FLASHStatus = FLASH_ProgramHalfWord(Address, *Data);

Address+=2;

Data+=1;

if(Len-i>=2)

i+=2;

else if(Len-i==1)

i+=1;

else if(Len-i==0)

break;

}

else

{

}

FLASH_LockBank1();

}

1. Before writing the data i m checking whether the data in the address 0x0800F000 is 0xFF. If so then i proceed to next step.

2. At this address - 0x0800F000 the string length is written and from 0x0800F002 the original data is written.

3. I m able to read back the data from this address also.

4. Next i m checking that whether the data in the address 0x0800F025 is 0xFF.

5. If yes, then i m trying to write the next string length.

6. But at this point, the control goes to HARDFAULT_ERROR.

I m not sure where is the original trouble is..

rosarium · ‎2011-06-27

Posted on June 27, 2011 at 14:28

Can you try once making the data type of Temp_RdLen as uint16_t.

And can you check the data type for NbrOfPage. Is there any overflow???

ezyreach · ‎2011-06-27

Posted on June 27, 2011 at 14:57

The original data is read and kept in RdLen which is declared as uint16_t....

Temp_RdLen is used for just manipulation.

NbrOfPage is declared as uint32_t...

No overflow is there due to the below deeclarations....

BANK1_WRITE_END_ADDR = 0x0800F3FFF

BANK1_WRITE_START_ADDR = 0x0800F000

FLASH_PAGE_SIZE = 0x400

NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FLASH_PAGE_SIZE;

Tesla DeLorean · ‎2011-06-27

Posted on June 27, 2011 at 18:40

The STM32F100C8 only has 64KB of FLASH so

BANK1_WRITE_END_ADDR = 0x0800F3FFF

Is going to cause problems, isn't it?

Perhaps you want

BANK1_WRITE_END_ADDR = 0x08010000

Otherwise your page count will be wrong. With 0x0800FFFF you'd be missing the erase of the last block. With 0x0800F3FFF you're way beyond the capacity of the part.

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ezyreach · ‎2011-06-27

Posted on June 27, 2011 at 20:25

@clive1

Its my typing error....

The bank1 end address is defined as,

#define BANK1_WRITE_END_ADDR ((uint32_t)0x0800F3FF)

With this macro defined and the code posted earlier, i got the hard fault error....

Tesla DeLorean · ‎2011-06-27

Posted on June 28, 2011 at 02:43

So what instruction is faulting? It will fault if you touch memory beyond your control. Implement a Hard Fault handler like Joseph Yiu's. It's been discussed a couple of times in the last week.

BANK1_WRITE_END_ADDR = 0x0800F3FF

BANK1_WRITE_START_ADDR = 0x0800F000

FLASH_PAGE_SIZE = 0x400

NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FLASH_PAGE_SIZE;

NbrOfPage = ZERO, will that cause a problem?

Add some diagnostic output to your code, so you can pin down the failure.

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ezyreach · ‎2011-06-27

Posted on June 28, 2011 at 07:30

@Clive1

For the first time after the MCU is erased and programmed, doesnt require again to erase the flash of a particular bank to start writing of the datas.

If i disable the flash erase in the earlier stated code, i dnt think the NbrOfPage=0 will cause a problem.

If writing a data on the location where already some data is written, then a flash erase followed by new write is required, for which i do agree.

In my case, i m not testing that scenario right now and hence trying to write the data at different locations at different instances and not writing total 1KB of data at one instance...

ezyreach · ‎2011-06-27

Posted on June 28, 2011 at 07:32

@clive1

Moreover, in my application i use 3 USARTS for various purposes.

In that case, using of Printf is not quite clear to which USART the output will be pushed too..

And when 3 USARTS are being used for different purpose where 1 USART being used to connected to PC for debugging, upon using printf the MCU doesnt not work after that statement...

Please help me to clarify if i m wrong here.

Tesla DeLorean · ‎2011-06-27

Posted on June 28, 2011 at 08:14

In Keil you can re-target printf() to any serial port by replacing the low-level character IO routines.

4. Next i m checking that whether the data in the address 0x0800F025 is 0xFF.

5. If yes, then i m trying to write the next string length.

6. But at this point, the control goes to HARDFAULT_ERROR.

You're not trying to write 16-bit values to ODD addresses (0x0800F025) are you?

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ezyreach · ‎2011-06-28

Posted on June 28, 2011 at 13:13

I m using IAR....hence not sure how to retarget the printf for the corresponding USART....

Yes the second string, i m starting to write from the address 0x0800F025.

Is the writing of data starting from odd address is not possible?

If so why?