Hi.
I'm using the C5515 ezdsp kit and have managed to set up DSP-USB comm in both directions using the USB-DMA CSL example. I've seen that by default packet sizes are set to 64 bytes, even for HS bulk endpoints. I've set them to 512 bytes and can achieve a bulk transfer rate of about 170 Mbit/s which is not ideal but much more than I need.
However, for practical reasons I'd like to use HS interrupt endpoints with 1024 bytes packet size. When I set those, I get an "endpoint init failed"! Could you tell me why this is? Are 1024 bytes packets on interrupt endpoints not supported on this DSP/USB controller? Or did I forget to adjust some memory setting somewhere?
Of course, I've set the endpoint descriptors correctly (controlled by USBlyzer for packet sizes up to 512bytes):
Uint16 cfgDesc[40] = {
// ...
// interrupt endpoints with wMaxPacketSize=0x0200 and bInterval=0x01
// EPdesc bLength bmAttr eAddr wMaxPsize[1:0] bInterval
0x0507, 0x0381, 0x0200, 0x0701, //endpoint 1 IN descriptor
// eAddr EPdesc wMaxPsize[0] bmAttr bInterval wMaxPsize[1]
0x0105, 0x0003, 0x0102, //endpoint 1 OUT descriptor
0x0507, 0x0382, 0x0200, 0x0701, //endpoint 2 IN descriptor
0x0205, 0x0003, 0x0102, //endpoint 2 OUT descriptor
0x0507, 0x0383, 0x0200, 0x0701, //endpoint 3 IN descriptor
0x0305, 0x0003, 0x0102, //endpoint 3 OUT descriptor
0x0507, 0x0384, 0x0200, 0x0701, //endpoint 4 IN descriptor
0x0405, 0x0003, 0x0102 //endpoint 4 OUT descriptor
};
And I've also changed all CS_USB_BULKs to CS_USB_INTRs and packet size constants to 0x0400 in CSL calls.
So what am I doing wrong? Thank you very much for your help.
Andreas
