Winbond w25n01GV support

[akareembedri]

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Hi, I'm using the Winbond W25N01GV in a project and I'm having a hard time running initial tests on it. I'm using your TestFlash example. I managed to obtain the correct JEDEC ID from it after making a few modifications to the library, but I couldn't write anything to memory as the error check always flags the write operation. The read functions seems to work well but I have no way to verify it since I can't write to memory. Please let me know if your library can support the Winbond W25N01GV and I would appreciate any adivce on how to run the write/read instructions.

Thank you!

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[Marzogh]

Hi mate, unfortunately I do not have any of the Winbond W25N series flash memory chips with me and I won't be able to test the library with them till I get some. I'm going to try and get my hands on some and I'll keep you posted.

In the meantime, could you try this and let me know what the results are please?

//Change any function that looks like this

flash.writeShort(addressToWriteto, dataToWrite);
//or
flash.writeByteArray(addressToWriteTo, bufferToWriteFrom, bufferSize);

//to this

flash.writeShort(addressToWriteto, dataToWrite, NOERRCHK);
//or
flash.writeByteArray(addressToWriteTo, bufferToWriteFrom, bufferSize, NOERRCHK);

This will disable error checking on the write functions and will let us know if the problem is with the actual act of writing to the chip (in which case I'll have to get my hands on one before I can do anything else) or if the errorCheck() function is broken (which might be easier to fix without the actual chip in hand)

[davidraclet]

Hi, Just by running the example 'TestFlash', I confirm JEDEC function doesn't work.

Maybe the architecture of this memory (1Gbit) is a little bit different from the smaller tested. According specifications :

The W25N01GV 1G-bit memory array is organized into 65,536 programmable pages of 2,048-bytes each. The entire page can be programmed at one time using the data from the 2,048-Byte internal buffer. Pages can be erased in groups of 64 (128KB block erase). The W25N01GV has 1,024 erasable blocks.

The diagram in the specs shows each page capacity is 2KB, divided in 4 sectors of 512 Bytes.

The page buffer is not 256 bytes but 2048 and erase function seems to work only on one block (= 64 pages = 128KBytes). The example initializes uint8_t pageBuffer[256]; Do you think this architecture is working with your library ?

Thank you. David

[TimoteoMendes]

Hello Marzogh, Any news? I have been performing some tests with this and the 2Gb version, a stack of 2x 1Gb. If I could help in the development it would be nice as I also need a good solution to use this memories. For now because the ATMEGA328 is a bit limited I decided to use the STM32 with the duino version from Roger. The commands in this memory are a bit different, here the list I have been tested and worked out: //set instructions #define W_EN 0x06 //write enable #define W_DE 0x04 //write disable #define R_SR 0x05 //read status reg #define W_SR 0x01 //write status reg #define DEV_RST 0xFF //reset the device ~500us #define DIE_ST 0xC2 //command to change DIE 0x00 ou 0x01 depois #define PAGE_PGM 0x02 //page program #define BLK_E_128K 0xD8 //block erase 128KB #define PROGRAM_EXEC 0x10 //grava o buffer (2048 ou 2112) para a pagina #define LOAD_PROGRAM 0x02 //escrever no buffer de 1 a 2048 Bytes

#define PDWN 0xB9 //power down #define R_JEDEC_ID 0x9F //read JEDEC ID = Manuf+ID (suggested) //read instructions #define READ 0x03 #define READ_PAGE 0x13 #define FAST_READ 0x0B

Thanks, Tim

[sslupsky]

I had a quick look at the datasheet and these parts are NAND flash. Does this library support NAND flash devices?