SDIO Initialization Stuck on Custom Board with IW610 Module

[Amarnath_473]

Hi all,

I am working on the MIMXRT1176 with a custom board and using MCUXpresso SDK v25.09 for a Bluetooth/Wi-Fi module based on the IW610 chip family.

Hardware Connections:

SDIO interface: SD_DATA0-3, SD_CMD, SD_CLK connected.

UART: Tx, Rx, and GND connected.

GPIO: WL_RST, SDIO_RST connected.

The module is powered via an external USB-C cable.

Software:

I am using the SDK example Wireless_uart for BLE.

I updated the macro in preprocessor section to:

WIFI_IW610_BOARD_MURATA_2LL_M2

When attempting to initialize the SDIO interface, the program gets stuck in a loop.

I have attached a screenshot of the code section where it hangs.

Could anyone suggest what could be causing this issue or provide guidance on proper SDIO initialization for the IW610 module on a custom board?

Thanks in advance,
Amar.

[Ricardo_Zamora]

Hello,

Hope you are doing well. By any chance, have you tried with our MIMXRT1170-EVKB? Are you seeing the same behavior?

Could you please confirm that you are using the 2LL Murata module?

Best Regards,

Ricardo

[Amarnath_473]

hi @Ricardo_Zamora ,

I have an update regarding my progress. The SDIO initialization is now working successfully, and I am attempting to download the firmware to the MAYA W476 module. However, I am encountering an issue in the function static fwdnld_intf_ret_t sdio_interface_send() within fwdnld_sdio.c. During execution, the length value is 16 for 2–3 iterations, after which an error occurs. I have attached an image for reference showing the exact point where it stops.

Additionally, I would like clarification: since both the Murata Type 2LL module and the MAYA-W4 are based on the IW610 chipset, can the same firmware provided for the Murata 2LL be used for the MAYA-W4 as well?

Best regards,

Amar.

[Ricardo_Zamora]

Hello Amar,

By any chance, have you tested any other Wi-Fi example?

Best Regards,

Ricardo

[Amarnath_473]

Hi @Ricardo_Zamora ,

I have tested using the other example codes and encountered the same issue. While command transfers are responding correctly — confirmed using the following function, which returns a length of 16 or 17: in Wi-Fi client example.

t_u16 wlan_card_read_f1_base_regs(void)
{
t_u16 reg;
uint32_t resp = 0;

(void)sdio_drv_creg_read(READ_BASE_0_REG, 1, &resp);
reg = (t_u16)(resp & 0xFFU);
(void)sdio_drv_creg_read(READ_BASE_1_REG, 1, &resp);
reg |= (t_u16)((resp & 0xFFU) << 8);

return reg;
}

However, when attempting to send firmware data, the transfer fails within the SDMMCHOST_TransferFunction. The function detects a data transfer failure by using flags in else condition and sets error = kStatus_Fail.

I have attached an image of the function for your reference. Could you please provide guidance on how to resolve this data transfer issue?

Can we use same firmware which is provided for MURATA TYPE 2LL module to the MAYA W4 module because both are based on IW610 chipset family?

Thanks & regards,
Tarak.

[Amarnath_473]

For your clarification, the full part number of the Wi-Fi/BLE module is u-blox MAYA-W476, which is based on the NXP IW610 chipset.

If driver support is available, kindly guide me on the software changes required to enable support.

Best regards,

Amarnath.

[Amarnath_473]

Hi @Ricardo_Zamora ,

Thank you for your reply.

1. I do not have the MIMXRT1170-EVKB, which is why I am working with a custom board.

2. I am currently using the u-blox MAYA-W4 module, which is based on the IW610 chip family, for Wi-Fi/BLE.

Could you please let me know that driver/firmware support is available for u-blox MAYA-W4?

Best regards,

Amar.