Part Number:EVMK2G
Tool/software:TI-RTOS
Hi,
I am having one K2G-EVM and using TI RTOS (Processor SDK) on it. The PSDK have USB driver and it implements mass storage class.
I am trying to enumerate an iPhone. I am not concerned about any USB class now. I am just trying to get the device descriptor.
With iPhone models like iPhone 6, iPhone SE and iPhone X, I am able to get the device descriptor with the existing PSDK USB driver without any modification.
But for iPhone 5c, I am unable to do the same. Unlike other iPhones, iPhone 5c is not even getting charged when I connect it to the K2G board.
I am debugging the code and I have found the following:
- In working scenario, once I get event interrupt in USBSTS register, I go ahead and read DWC_USB_PORTSC1 register where I get value 0x206E1. The 0th bit (Current Connect Status bit) transitions to 1 indicating that a device is connected. The Port Link State bits(bit 8:5) is 7 which means Link is in Polling State.
- In case of iPhone 5c, I get the event interrupt in USBSTS register but when I read DWC_USB_PORTSC1 register, I get value 0x202a0. The 0th bit (Current Connect Status bit) is still 0 and the value of Port Link State bit is 5 which means Link is in RxDetect Sate.
Would you please suggest me where should I look to fix the issue?
Regards,
Krishna