Hi,
We have integrated NXP WiFi stack to MIMX8MM SDK and are trying to get it working from cm4. However we are having some problems to get the communication working.
When the first command is sent over SDIO (GO IDLE), device seems to totally hang up. This happens almost immediately when xferType is written to register CMD_XFR_TYP.
1) First 80 clocks are send to the card and those can be seen successfully with the logic analyser.
/middleware/sdmmc/sdio/fsl_sdio.c / function: static status_t SDIO_ProbeBusVoltage(sdio_card_t *card) / SDMMCHOST_SendCardActive(card->host) is called to send 80 clocks.
2) Problem happens few lines below, when SDIO_GoIdle(card) is called. When CMD_XFR_TYP is set, device hangs up. However data on the line is seen with logic analyser.
/devices/MIMX8MM6/drivers/fsl_usdhc.c / Function: USDHC_SendCommand / line: base->CMD_XFR_TYP = xferType;
Do you have any idea what could be the root cause for the hang up? Any task does not seem to run at that point.
Our setup:
HW: i.MX8MM + MAYA-W161-00B (NXP IW416)
SDK: SDK_2_12_1_EVK-MIMX8MM
We are using wifi_setup example code (modified for i.MX8/cm4): https://github.com/nxp-mcuxpresso/mcux-sdk-examples / evkmimxrt1170/wifi_examples/wifi_setup/cm7
Required SW components have been taken from these repositories:
https://github.com/nxp-mcuxpresso/mcux-sdk
- components/gpio, components/osa, components/wifi_bt_module
- devices/xxx/drivers/fsl_usdhc
https://github.com/nxp-mcuxpresso/mcux-sdk-middleware-sdmmc
- middleware/sdmmc/
https://github.com/NXP/wifi_nxp
- middleware/wifi_nxp
/devices/MIMX8MM6/MIMX8MM6_cm4.h
- added required definitions for USDHC_VEND_SPEC2_ACMD23_ARGU2_EN
/devices/MIMX8MM6/drivers/fsl_clock.*
- modifed to add USDHC clock root definitions
Best Regards, Toni
