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Cypress FX1 / FX2LP bulk transfers - interrupt based

Setup

- Cypress Development Board, with FX1

- out bulk transfer on EP6 - double buffering

- ports I/O (IFCONFIG:0.1 = 00b)

Firmware is based upon the samplecode 'bulkloop' supplied with the Development Board. Extract from ISR_EP6inout: { .... EP6BCL = 64; // write anything to BC to allow EP to be written to again EZUSB_IRQ_CLEAR(); // Clear USB interrupt EPIRQ = bmEPIRQ_EP6; }

Problem

- only the first 2 out packets generate an EP6inout interupt on the usb-device

- the following transfers (third, fourth, aso) generate a time-out

Question It seems like the endpoint is not re-armed. When changing to triple buffering one more packet is transferred. The same occurs when using quadruple buffering: 4 packets are transferred, the next packets are blocked. What must be changed on the configuration and/or re-arming to allow more packets to be send?

Reply to
gmonteyne
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Reply to
Jona Vark

I'm not sure about the FX1, but on the FX you need to write a '0' to the BC of the OUT endpoint to re-arm it (obviously after you've read all the data).

Regards, Mark

Reply to
Mark McDougall

We found out that you have to write exactly 0x80 bytes into the Low Bytecount to re-arm it on the FX1 and FX2LP endpoint for endpoints

2,4,6 and 8. This is also done in the examples that are delivered with the Cypress development kit. The datasheets of the FX2LP say you can write any value to the bytecount to re-arm it, but it must be exactly 0x80, otherwise it doesn't work.

Just for the record, so you all don't make the same mistake.

Greet> gm>

Reply to
peter.dierckx

We found out that you have to write exactly 0x80 bytes into the Low Bytecount to re-arm it on the FX1 and FX2LP endpoint for endpoints

2,4,6 and 8. This is also done in the examples that are delivered with the Cypress development kit. The datasheets of the FX2LP say you can write any value to the bytecount to re-arm it, but it must be exactly 0x80, otherwise it doesn't work.

Just for the record, so you all don't make the same mistake.

Greet> gm>

Reply to
peter.dierckx

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