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Hack that allow to re-use PN53x (connected in USB) when something goes wrong.

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Summary: Implement the abort mechanism (PCD->PICC ACK)
Currently, this issue is motivated by the need to reconnect to the device after a failure: ie. Issue 114.
BTW, this feature could also be useful to break an infinite polling or to cancel a previously sent command.
This commit is contained in:
Romuald Conty 2010-09-28 15:15:36 +00:00
parent a0ece60203
commit 7a7687b3b8
1 changed files with 8 additions and 0 deletions
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8
libnfc/drivers/pn53x_usb.c
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@ -239,6 +239,14 @@ pn53x_usb_transceive (nfc_device_t * pnd, const byte_t * pbtTx, const size_t szT
// TODO: Move this one level up for libnfc-1.6
uint8_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
// FIXME Little hack to reset chip before talking to it:
if (pbtTx[1] == 2) { // hooked to the getfirmware command...
#ifdef DEBUG
PRINT_HEX ("TX", ack_frame, 6);
#endif
usb_bulk_write (pus->pudh, pus->uiEndPointOut, (char *) ack_frame, 6, USB_TIMEOUT);
}
// Packet length = data length (len) + checksum (1) + end of stream marker (1)
abtTx[3] = szTxLen;
// Packet length checksum