FreeRTOS SDK SPI Sector read issues

[mohdamerkhalidi]

Hi,
I am trying to work with the SPI APIs for esp8266-12f. When reading the SPI device ID using the SPI SDK API for getting the device id, I get 4016E0. It seems the external flash on the board is of size 4Mbytes divided into 4KByte sectors(I did verify this). While reading the flash sectors, I can read the sectors from 0-127 but when reading sector 128,129.., the API returns error. Is this because the flash size is 4Mbit rather than 4Mbyte. Or is there something that I am missing here? The FreeRTOS' API system_get_sdk_version returns the SDK Version as 1.4.0(c599790).

[Martinus]

I have no experience with FreeRTOS but in general it looks like your flash is 512kByte (indeed 4MBit). Then it ends at sector 127.

[mohdamerkhalidi]

Yes it seems like it is 512KB but the Device ID and the manufacturer claims it is a 4MB flash. I am wondering if the SPI APIs provided with the RTOS SDK has some kind of check which returns ERROR once I try to read more than 127 sectors. Also I tried to program the esp using the esptool.py with code size greater than 512KB and everything works fine.The esptool.py uses its own script to program the flash.

[tozett]

looked here,

http://bbs.espressif.com/download/file.php?id=1371
( 99A-SDK-Espressif IOT Flash RW Operation__EN_v1.0.pdf)

but this did not help to clarify.
may you find some hint in pete scargills blog? he has done something with the SDK..

https://www.google.de/webhp?sourceid=ch ... h%20sector