ATWILC1000-MR110PB SDIO inteface issue

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Hi, I am trying out ATWILC1000-MR110PB WiFi SDIO module with STM32F429. But i am not able to get any response while sending commands to Wifi chip for SDIO initialization. I have done SDIO,Chip-Enable pin and Reset pin configuration according to datasheet. Does anybody have an idea how to start sdio communication?