Need QPI code example for my memory chip

[inghowe83]

Hi,

I cannot locate any QPI sample code in the example. Was it possible for anyone to share me the sample code?

Thanks a bunch.

[haakonsh]

Do you mean QSPI? If so: QSPI Example.

[inghowe83]

Hi haakonsh

Thanks for the quick feedback. But when I checked the solutions, I think QPI and Quad SPI is different solutions.

Quad SPI
While dual SPI re-uses the existing serial I/O lines, quad SPI adds two more I/O lines (SIO2 and SIO3) and sends 4 data bits per clock cycle. Again, it is requested by special commands, which enable quad mode after the command itself is sent in single mode.

SQI Type 1: Commands sent on single line but addresses and data sent on four lines

SQI Type 2: Commands and addresses sent on a single line but data sent/received on four lines

QPI/SQI
Further extending quad SPI, some devices support a "quad everything" mode where all communication takes place over 4 data lines, including commands.[19] This is variously called "QPI"[18] (not to be confused with Intel QuickPath Interconnect) or "serial quad I/O" (SQI)[20]

This requires programming a configuration bit in the device and requires care after reset to establish communication.

https://en.wikipedia.org/wiki/Serial_Peripheral_Interface#QPI/SQI

[haakonsh]

Ahh, maybe. I've got to check with the developers. 

-Update:

It depends on the memory chip. If it just ignores invalid commands and addresses then maybe. Do you have a datasheet for the memory chip?

[inghowe83]

Thanks a bunch haakonsh, kindly refer to the attached link. Besides that, may I know how to support this chip using the quadspi sample? The reason I turn to QPI is because the quadspi sample just don't works with this chip.

http://www.cypress.com/file/316661/download

Model:S25FL064LABNFI010

[haakonsh]

Well, we should be able to interface with this memory chip via standard QSPI. Do you have a logic analyzer scope of the communication when using the SDK example?

[inghowe83]

Will nrf_drv_qspi_init(&config, qspi_handler, NULL) trigger the SPI to sent out data? I notice my logic analyzer capture some data (0x500) when the nrf_drv_qspi_init is executed. I forget to add on, the yellow 1 is CS, blue 2 is SCK, purple 3 is SI/SI0 and green 4 on the scope is refer to SO/SI1