QSPI driver with 2 i/o Pins to flash mx25

Hello ,

We are attempting to use the QSPI driver with an MX25 with 2  i/o lines instead of 4, essential SB 10 and 15 on the nrf52840 DK have been cut.  However I am not able to read back data from it that matches the write. Is there something we are missing?

These are the settings we are using:

#ifndef NRFX_QSPI_CONFIG_READOC
#define NRFX_QSPI_CONFIG_READOC 0
#endif

//  NRFX_QSPI_CONFIG_WRITEOC  - Number of data lines and opcode used for writing.
 
// <0=> PP 
// <1=> PP2O 
// <2=> PP4O 
// <3=> PP4IO 

#ifndef NRFX_QSPI_CONFIG_WRITEOC
#define NRFX_QSPI_CONFIG_WRITEOC 0


and changes to init WRSR register values:

    uint8_t temporary = 0x00;
 
    // Switch to qspi mode
    cinstr_cfg.opcode = QSPI_STD_CMD_WRSR;
    cinstr_cfg.length = NRF_QSPI_CINSTR_LEN_2B;
    err_code = nrf_drv_qspi_cinstr_xfer(&cinstr_cfg, &temporary, NULL);
    APP_ERROR_CHECK(err_code);


Thanks,
RJ