Hello all, I am trying to use the sFLASH lib directly but I have no success. This is the code: SYSTEM_MODE(SEMI_AUTOMATIC); #define ARRAY_LENGTH 256 #define ADDR 0x80000 static uint8_t g_data[ARRAY_LENGTH]; static uint8_t g_erase[ARRAY_LENGTH]; void fillDat(int w) { for(int i =0; i < ARRAY_L…

I doesn’t look like you are writing it. In my code I used a buffer size of 256 and passed 256 as the third arg to sFLASH_WriteBuffer(). Maybe that would help you.

@bko : I changed the array size to 256 and this is the result now: Test 2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 …

Hi @MarkusL FLASH memory needs to be erased before you write it. That puts an all-ones value of 255 into the memory. From that point on you can write locations more than once but you can never write a 1 back into any bit, only change a 1 to a 0. If you change your test to erase the sector before…

@bko : writing 255 before gets a partial success, the first round is now correct. But when I write 255 a second time it does not seem to have any impact and I get the same strange pattern: Test 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38…

You don’t write 255, you erase. You are calling sFLASH_EraseSector(addr) in setup, but never again. Erase is a different physical operation on the part than write.

OK I see the problem. That means also there is no erase function for a single byte? How many bytes does a call to sFLASH_EraseSector(ADDR) erases?

The SST25VF devices have a 4K-byte sector erase. So any erase step acts on 4096 bytes starting at the ADDR you pass in, and that ADDR (probably) will be reduced to a modulo-4K number.

@MarkusL , have you considered using the flashee-eprom library? [image] [Submission] Flashee-eeprom library: eeprom storage in external flash I’ve created a library that provides eeprom-like access to the external flash. Please see the repo for documentation: https://github.com/m-mcgowan…

@peekay123 : Yes, I have been using it for some time but I get repeated crashes after ~72 hours of runtime. By using sFLASH I’ll try to narrow down the bug.

Hi @MarkusL [image] MarkusL: By using sFLASH I'll try to narrow down the bug. I am really not sure how this going to work for you. Flashee is like a nice easy to drive passenger car while the sFLASH interface is like a vehicle chassis with an engine mounted on it. They both sort-of do the …

How to use sFLASH lib (sst25vf_spi.h)

Troubleshooting

peekay123 March 16, 2015, 10:48pm 9

@MarkusL, have you considered using the flashee-eprom library?

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How to use sFLASH lib (sst25vf_spi.h)

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