RT1060 - Hyperflash Write example

[pauricacre]

I'm having issues using the flexspi_nor_hyperbus_write() in the hyper_flash_polling_transfer example for the RT1060EVK. I have modified by hardware to use hyperflash and my application is running from RAM.

Inside the flexspi_nor_hyperbus_write function, the address is multiplied by 2. What is the reason for this?

status_t flexspi_nor_hyperbus_write(uint32_t addr, uint32_t *buffer, uint32_t bytes)
{
    flexspi_transfer_t flashXfer;
    status_t status;

    flashXfer.deviceAddress = addr * 2;
    flashXfer.port          = kFLEXSPI_PortA1;
    flashXfer.cmdType       = kFLEXSPI_Write;
    flashXfer.SeqNumber     = 1;
    flashXfer.seqIndex      = HYPERFLASH_CMD_LUT_SEQ_IDX_WRITEDATA;
    flashXfer.data          = buffer;
    flashXfer.dataSize      = bytes;
    status                  = FLEXSPI_TransferBlocking(FLEXSPI, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    return status;
}

When I remove the addr*2, it writes to the intended address but the commands no longer work.

For example, if I want to write to the address 0x20000, how should I be using the flexspi_nor_hyperbus_write function? This is how I would have intended to use it? Is there something else required?

uint8_t data[8] = "abcdefgh";
flexspi_nor_hyperbus_write(0x20000, (uint32_t*)(data), sizeof(data));

In conclusion, what is the reason for this and why do I need it?

[victorjimenez]

Hello, 

The Hyper-flash is Word Addressable, which is accessed in terms of 16-bit. FlexSPI does not transmit Flash address bit 0 to the Flash. Thus, multiplying the deviceAddress by 2 makes sure FlexSPI transmits the right address value.

Regards,
Victor 

[pauricacre]

Is the function flexspi_nor_hyperbus_write() for commands only or can it be used for writing data to the chip?

Should flexspi_nor_flash_page_program() only be used for writing data to the flash chip?

Sorry this is no information on the function headers so its not clear what their purpose is.

[victorjimenez]

Hello, 

Keep in mind that the RT1060 doesn't have an internal flash. The memory you are writing to when calling this function is external. That being said, the intended use of functions flexspi_nor_hyperbus_write and flexspi_nor_flash_page_program is to write to this external flash. 

Regards,
Victor