RT1170 FlexSPI sequential read

[Eugene3]

I connect two ROMs which has QSP interface on FlexSPI2_A SS0 and SS1 in parallel.

I'd like to read these devices sequentially, but I couldn't understand how to configure and read them from reference manual.

Do you have sample code or documents?

For example, I'd like to assign address like the following.

SS0 : Address : 0x0000 - 0x0FFF

SS1 : Address : 0x1000 - 0x1FFF

And I'd like to read from 0x0000 to 0x1FFF continuously.

[Kan_Li]

Hi @Eugene3 ,

You may find demo code in the SDK package(SDK_2_15_000_MIMXRT1170-EVK\boards\evkmimxrt1170\driver_examples\flexspi)

We also provide an online training for this topic, please kindly refer to https://www.nxp.com/design/training/i-mx-rt1170-mcus-flexspi-controller:TIP-IMX-RT1170-CROSSOVER-MCU... for details.

General speaking, the Flash Control Register 0 (FLSHA1CR0 - FLSHB2CR0) configure the max flash size for each device, Please refer to "30.3.4 Flash memory map" in the RT1170 RM for more details.

Hope that helps,

Have a great day,
Kan

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[Eugene3]

Hi @Kan_Li 

Thank you for your information.

I referred to flexspi_nor_polling_transfer.c and I could access the SS0 device or the SS1 device individually by changing "flexspi_port_t port" of FLEXSPI_SetFlashConfig().

However, I'd like to read/write 2 devices continuously like one device. In other words, I'd like to read from BaseAddr to (FA1_SIZE+FA2_SIZE) continuously without considering SS control.

If you have any source code that might be helpful, would you share with me?

[Kan_Li]

Hi @Eugene3 ,

For your case, I think you need to call FLEXSPI_SetFlashConfig() twice for both SS0 device and SS1 device.

Have a great day,
Kan

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[Eugene3]

Hi @Kan_Li 

Thank you for your information.

I referred reference manual 30.7.2.15.2, and it says "FlexSPI determines the chip select automatically according to this start address".

I'd like to know how to use this feature.

[Kan_Li]

Hi @Eugene3 ,

I am sorry, but I could not get your point. When you use IP command to access the ext flash, you use this feature automatically, no need to configure anything to enable this feature.

Have a great day,
Kan

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[Eugene3]

Hi @Kan_Li 

Thank you.

I referred to "flexspi_nor_polling_transfer.c" but I couldn't figure out how to use IP command to access the ext flash. Do you have any sample source code to use IP command?

[Kan_Li]

Hi @Eugene3 ,

Actually IP commands are usually used for programming/erasing/configuration. AHB access is always recommended for reading, and that is how the demo of lexspi_nor_polling_transfer is implemented. 

Hope that helps,

Have a great day,
Kan

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