Hi, I want to use FX3 SPI to program SPI Flash.

Read page seemed to be OK by CyU3PSpiReceiveWords function.

As I program 10 pages(256bytes per page) by CyU3PSpiTransmitWords API, I find randomly lost 3 bytes data at tail of page by capturing SPI signals with LA.

So... Is there any restrictions of CyU3PSpiTransmitWords  functions? Or just I cannot over 256 bytes in one write?

Could anyone point me to an example of how to define more than 31 controls on an extension unit descriptor?

I believe a second extension unit is required for that.

I tried adding it in the following way, but it did not work.

    /* Processing Unit Descriptor */
    0x0D,                               /* Descriptor size */
    CX3_CS_INTRFC_DESCR,                /* Class specific interface desc type */
    0x05,                               /* Processing Unit Descriptor type: VC_PROCESSING_UNIT*/
    0x02,                               /* ID of this unit */
    0x01,                               /* Source ID: 1: Connected to input terminal */
    0x00, 0x40,                         /* Digital multiplier */
    0x03,                               /* Size of controls field for this terminal: 3 bytes */
                                        /* A bit set to 1 indicates that the mentioned */
                   						/* Control is supported for the video stream. */
    0b0111'1111,						/* D0: Brightness
                                         * D1: Contrast
                                         * D2: Hue
                                         * D3: Saturation
                                         * D4: Sharpness
                                         * D5: Gamma
                                         * D6: White Balance Temperature 
                                         * D7: White Balance Component */

    0b0001'0011,                        /* D8: Backlight Compensation
                                         * D9: Gain
                                         * D10: Power Line Frequency
                                         * D11: Hue, Auto
                                         * D12: White Balance Temperature, Auto
                                         * D13: White Balance Component, Auto
                                         * D14: Digital Multiplier
                                         * D15: Digital Multiplier Limit */

    0b0000'0000,                         /* D16: Analog Video Standard 
                                         * D17: Analog Video Lock Status
                                         * D18..(n*8-1): Reserved. Set to zero */
    0x00,                               /* String desc index: Not used */
    0x00,                               /* Analog Video Standards Supported: None */

    /* Extension Unit Descriptor */
    //0x1C,                               /* Descriptor size */
    0x1D,                               /* Descriptor size (4 control bytes) */    
    CX3_CS_INTRFC_DESCR,                /* Class specific interface desc type */
    0x06,                               /* Extension Unit Descriptor type */
    0x03,                               /* ID of this terminal */
    0x0C, 0x89, 0xB6, 0xAC,             /* GUID specific to AN75779 firmware. Obtained from Visual studio */
    0xB3, 0xA3, 0x60, 0x40,             /* static const GUID <<name>> = */
    0x8B, 0x9A, 0xDF, 0x34,             /* { 0xacb6890c, 0xa3b3, 0x4060,{0x8b, 0x9a, 0xdf, 0x34, 0xee, 0xf3, 0x9a, 0x2e} };*/
    0xEE, 0xF3, 0x9A, 0x2E,
    //0x01,                               /* Number of controls in this terminal */
    //0x1F,                               /* Number of controls in this terminal */ 1F = 31
    0x01,                               /* Number of input pins in this terminal */
    0x02,                               /* Source ID : 2 : Connected to Proc Unit */
    //0x03,                               /* Size of controls field for this terminal : 3 bytes */
    0x04,                               /* Size of controls field for this terminal : 4 bytes */
    0b1111'1111,                        /* Controls supported */
    0b1111'1111,                        /* Controls supported */
    0b1111'1111,                        /* Controls supported */
    0b0111'1111,                        /* Controls supported */
    0x00,                               /* String descriptor index : Not used */
#if true
    /* 2nd Extension Unit Descriptor */
    0x1C,                               /* Descriptor size 28 bytes*/
    CX3_CS_INTRFC_DESCR,                /* Class specific interface desc type */
    0x06,                               /* Extension Unit Descriptor type */
    0x04,                               /* ID of this terminal */    
    0xAF, 0x80, 0x74, 0x32,             /* GUID specific to AN75779 firmware. Obtained from Visual studio */
    0x25, 0x17, 0x49, 0x27,             /* static const GUID <<name>> = */
    0x9E, 0x71, 0xAB, 0x4D,             /* { 0xacb6890c, 0xa3b3, 0x4060,{0x8b, 0x9a, 0xdf, 0x34, 0xee, 0xf3, 0x9a, 0x2e} };*/
    0xD9, 0x82, 0x91, 0x95,
    0x18,                               /* Number of controls in this terminal */
    0x01,                               /* Number of input pins in this terminal */
    0x03,                               /* Source ID : 3 : Connected to Ext. Unit */
    0x03,                               /* Size of controls field for this terminal : 3 bytes */
    0b1111'1111,                        /* Controls supported */
    0b1111'1111,                        /* Controls supported */
    0b1111'1111,                        /* Controls supported */
    0x00,                               /* String descriptor index : Not used */
#endif
    /* Output Terminal Descriptor */
    0x09,                               /* Descriptor size */
    CX3_CS_INTRFC_DESCR,                /* Class specific interface desc type */
    0x03,                               /* Output Terminal Descriptor type */
    0x05,                               /* ID of this terminal */
    0x01, 0x01,                         /* USB Streaming terminal type */
    0x00,                               /* No association terminal */
    0x04,                               /* Source ID : 3 : Connected to Extn Unit */
    0x00,                               /* String desc index : Not used */