USB superspeed peripherals Forum Discussions

Hi, There

I'm using fx3 gpif II connect to fpga to get data. I've designed gpif state machine and tested using auto many to one mode and it works. I then followed the AN75779 image sensor sample and switched to manual many to one dma channel because we need to add some header information or insert some packet. However I've been stuck for a couple of days struggling to make it work. The dma callback is called but if I make any calls like CyU3PDmaMultiChannelGetBuffer or CommitBuffer/DiscarBuffer my whole program stuck, the output from my main thread also stops. It seems to me it somehow crashed. If I debug using openOCD I cannot see what are the errors.

Does anybody has any suggestions on what might cause the problem or how to debug this situation?

thanks

Joe

How ez-usb-fx2lp automatically loads c2 load eeprom boot(24LC128-16KB-2 bytes address)?

which eeprom will select if i connect two eeprom with same size to fx2lp on I2C bus?

Hello,

I have a UAC device that can output different audio sample rate 32kHz/44.1kHz/48kHz via setting,  then is connected to PC via USB.

In FX3 firmware code, I have already modified some USB descriptors to support multiple sampling frequencies, as follow:

At Type I Format descriptor,

(1) increase the number of sampling frequencies (bSamFreqType)

(2) list up available frequencies

(3) Tune the size of Type I format descriptor, by the increased bytes for frequencies

(4) Tune wMaxPacketSize of the endpoint descriptor, so that it covers the samples of the greatest frequency

(5) Set the bit 0 (Sampling Frequency control) of bmAttributes on Audio-Streaming Class-specific (AS-CS) endpoint descriptor.

(6) Tune the size of wTotalLength field of the Configuration descriptor

    /* Class specific AS Format descriptor - Type I Format Descriptor ???*/

    0x11,                           /* Descriptor size */

    0x24,                           /* Class-specific Interface Descriptor Type */

    0x02,                           /* Format Type Descriptor subtype */

    0x01,                           /* PCM FORMAT_TYPE_I */

    0x02,                           /* Number of channels - 2 */

    0x02,                           /* Subframe size - 2 bytes per audio subframe */

    0x10,                           /* Bit resolution - 16 bits */

    0x03,                           /* Number of samping frequencies - 1 */

    0x00, 0x7D,0x00, //32kHz

    0x44, 0xAC, 0x00, //44.1kHz

    0x80, 0xBB, 0x00,               /* Sampling frequency - 48000 Hz */

But per modifying code above, as amcap run on the pc, it doesn't have sound for all these three audio sample rate. So, I am not sure whether I need to modify or add other code. how do I tell PC which sampling frequency to use?

Thanks.

Dear Sir,

I cannot find any parameters for currents  of VDDIO1,VDDIO2,VDDIO3 in CX TRM or datasheet.

Can anyone share these parameters ?

David

From the schematic of the FX3 GPIO-to-HSMC adapter (CYUSB3ACC-006) it appears that the signals are placed somewhat randomly - some of the CTL and DQ signals go to one pin in a differential pair on the HSMC connector, and some share a pair with another signal. Is there any reason for this routing?

I'd like to create my own FX3-to-HSMC adapter PCB and re-route some of the CTL signals so I can expose 4 differential pairs on the HSMC connector and use them for another input to the FPGA board. I'd probably keep the pin-out the same except I'd move PMODE2 and CTL3 to the other side of J1C. Will changing the HSMC pins of these signals cause any issues?

Thanks!

-Colin