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    FX3 / CX3 Firmware for Streaming RAW Image Data using Cypress Driver

    Madhu Lakshmipathy

      For Image formats that are not supported by the UVC, (like RAW), the attached firmares can be used as reference (FX3 and CX3 firmwares attached)

         

      The main difference between the UVC firmwares and the firmware attached below are:

         

      (i) Vendor Commands are used to Start and Stop streaming rather than UVC Class Specific Control requests. Vendor command 0x99 is sent from PC to start the streaming. Vendor command 0x88 is for stopping the streaming in these firmwares.

         

      (ii) These firmwares have normal Cypress Descriptors enabling the Device to bind to Cypress Driver (cyusb3.sys) unlike the UVC Firmwares that have UVC Descriptors and bind to UVC Drivers.

         

      (iii) No UVC Headers are added to the Image data.

         

      (iv) No memory is allocated for UVC Headers or footers during DMA Channel Creation

         

      (v) The data streaming with  the attached firmware can be tested using Cypress Streamer Application

         

      Note:

         

      1a) In the FX3 firmware attached below, the sensor.c and sensor.h files are incomplete without any sensor configuration values. The user has to fill those files with the values of his/her sensor. Cypress would provide comple sensor.c and sensor.h files for MT9M114 sensor, provided the customer requests for the same via Cypress tech support along with an NDA signed with Aptina.

         

      1b) In the FX3 firmware, enable the macro "#define CY_DRIVER" in uvc.h for the firmware to toggle between UVC and Non-UVC (raw) applications

         

      2a) The CX3 firmware attached below uses the OV5640 sensor and the sensor configuration is also done in the firmware (without exposing the actual register values written). Though the OV5640 gives out YUY data, it is treated as RAW data and can be streamed to the host. (for testing purpose only. In the actual implementation, OV5640 settings are replaced by the original RAW Streaming sensor)

         

      2b) In the CX3 firmware, enable the macro "#define RAW" in cycx3_uvc.h file to switch between UVC and Non-UVC (raw) firmwares.

         

      Regards,

         

      - Madhu Sudhan

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