FX3S: Run time switch SDIO Interface mode 1 Bit to 4 Bit mode

[KrPa_4189911]

Hello,

I am developing an application there is a requirement that facilitates the SDIO Interface mode from a single-bit data bus to four-bit data bus in runtime.

The application looks like:

1. configure the SDIO interface using 1 Bit mode ( only one DAT[0] line would be enabled) [io_cfg.s0Mode = CY_U3P_SPORT_1BIT]
2. Do some Read/Write
3. Reconfigure the SDIO Interface using 4 Bit mode (All 4 lines, DAT[0] to DAT[3] lines would be enabled )[io_cfg.s0Mode = CY_U3P_SPORT_4BIT;]

How to enable these SDIO lines run-time? If it is possible to do so, will it affect interrupt handling?

SDIO Host: FX3S

SDIO Slave: Embedded SDIO card

KandlaguntaR_36​ You might aware of this setup.

Thanks

Krunal

[Hemanth · Accepted solution]

Hi Krunal,

For reconfiguring the iomatrix, you will have to do app stop involving gpiodeinit, uartdeinit, spideinit, flushing ep memory, destroying dma channel etc. - following which iomatrix can be reconfigured and app can be started.

Please refer to AN84868 where it is done.

Regards,

Hemanth