How to write a text file to external onboard memory of 64Mb on nrf52840 PDK?

[Rajat]

Hi Everyone 

I am able to write and read to and from QSPI memory interfaced with nrf52840 PDK.

I am using Segger Embedded Studio with sdk15.0.

I want to create a text file and store the text file inside the external memory.

Does segger allow File creation and writing ?

If yes, How can i achieve the requirements?

Thanks 

Rajat!

[daman_kaur86]

Hi Rajat,

how were you able to read and write data from QPSI memory??

please help me.

[Rajat]

Yes sure , what is the issue

[daman_kaur86]

I want to do the same thing as you did, as according to my project, I have interfaced a DHT11 sensor with nrf52840 and interfaced an external flash memory W25Q16 to it. and want to save temperature data in text and CSV format in the memory.

but as a beginner, i don't know how to start with it.

[Rajat]

The minimum possible write is 4096 bytes , less than that not possible
So in order to write the DHT11 data , you'll have to restart from the zero address when the address reaches its maximum value
You can create a structure which will contain the dht11 data and start writiing the sensor data in that structure and after every reading , write the structure to the memory and increment the address by 4096 bytes. If you don't increment by 4096 bytes , the previous data will be erased

1. Read sensor
2. Store in structure
2. Write to QSPI(Adddress = 0)
3. Address = 4096 + address

[daman_kaur86]

yeah got it.. but can you please provide your code, I will use it as a reference and that would be a great help! 

Thanks!!