500MB Data Storage without SD Card

RE: 500MB Data Storage without SD Card

hmolesworth — Wed, 29 Nov 2023 16:14:29 GMT

Edit: "NOR flash memory is generally considered more reliable than NAND flash memory because it utilizes individual memory cells to store data, which decreases the risk of errors affecting multiple pages."

Treat NOR flash similar to NAND flash in terms of drivers, just be aware that NAND flash will have some (more than NOR) data errors. Generally that can be handled by upper layers above the SPIM low-level drivers. Note SD cards are usually SLC or MLC NAND Flash but the error handling is done by a cpu embedded on the SD card. (SLC/MLC single vs multiple levels; MLC is denser, cheaper per bit but more error prone). Medical SD cards often use SLC in preference to MLC, though not mandatory.

979 in stock .. not sure which country you are searching.

RE: 500MB Data Storage without SD Card

Jared — Wed, 29 Nov 2023 10:11:43 GMT

You have to add an overlay that adds a jedec,spi-nor node,

regards

Jared

RE: 500MB Data Storage without SD Card

bilal7317x — Wed, 29 Nov 2023 07:40:28 GMT

RE: 500MB Data Storage without SD Card

bilal7317x — Wed, 29 Nov 2023 07:40:17 GMT

Also this IC is not available. Will have to wait till 16 weeks.

[quote userid="130162" url="~/f/nordic-q-a/106156/500mb-data-storage-without-sd-card"]even if it can do, the hardware is not available at stores.[/quote]

RE: 500MB Data Storage without SD Card

bilal7317x — Wed, 29 Nov 2023 07:33:16 GMT

https://github.com/nrfconnect/sdk-zephyr/blob/v3.4.99-ncs1/samples/drivers/spi_flash/src/main.c

can we use this example code to write data to this flash memory?

developer.nordicsemi.com/.../README.html

RE: 500MB Data Storage without SD Card

bilal7317x — Wed, 29 Nov 2023 06:56:58 GMT

I am new to nrf so can you share the library that I can use for storing and fetching files from this flash memory?
According to my understanding I can not use it with SD card drivers and I can not work on custom drivers.

Any kind of documentation url will be helpful.

RE: 500MB Data Storage without SD Card

hmolesworth — Wed, 29 Nov 2023 06:42:02 GMT

NAND Flash is just a simple SPI with DMA interface == SPIM, try an 8-pin 4GBit == 512MByte chip, lots available eg MT29F4G01ABBFDWB-IT-F or W25X40CLSNIG. Use in SPI or QSPI mode; I use Micron parts on the nRF52832.

Bad bits? Yes there are some but not many and most parts have these mapped out on receipt; manage as required unlike the SD card interface which does that for you. Bits can go bad in later usage, usually a read after write or software error correction handles that. Many applications eg medical device are write-once read back at depot; if a sector is bad after a write just write the same data in the next sector (example).