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add checking some rare case in iso14443-4 chaining. add NAK checking and aborting the data sending.

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merlokk
2019-08-30 16:47:20 +03:00
committed by Conor Patrick
parent 9041e5903c
commit 1ce191343f
2 changed files with 20 additions and 4 deletions
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18
targets/stm32l432/src/nfc.c
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@ -228,6 +228,8 @@ void nfc_write_response_chaining_plain(uint8_t req0, uint8_t * data, int len)
{
uint8_t res[32] = {0};
res[0] = iBlock;
res[1] = 0;
res[2] = 0;
if (len && data)
memcpy(&res[block_offset], data, len);
nfc_write_frame(res, len + block_offset);
@ -268,6 +270,19 @@ void nfc_write_response_chaining_plain(uint8_t req0, uint8_t * data, int len)
printf1(TAG_NFC, "R block RX timeout %d/%d.\r\n",sendlen,len);
break;
}
if (!IS_RBLOCK(recbuf[0]))
{
printf1(TAG_NFC, "R block RX error. Not a R block(0x%02x) %d/%d.\r\n", recbuf[0], sendlen, len);
break;
}
// NAK check
if (recbuf[0] & NFC_CMD_RBLOCK_ACK)
{
printf1(TAG_NFC, "R block RX error. NAK received. %d/%d.\r\n", recbuf[0], sendlen, len);
break;
}
uint8_t rblock_offset = p14443_block_offset(recbuf[0]);
if (reclen != rblock_offset)
@ -466,7 +481,8 @@ void rblock_acknowledge(uint8_t req0, bool ack)
NFC_STATE.block_num = !NFC_STATE.block_num;
buf[0] = NFC_CMD_RBLOCK | (req0 & 0x0f);
if (ack)
// iso14443-4:2001 page 16. ACK, if bit is set to 0, NAK, if bit is set to 1
if (!ack)
buf[0] |= NFC_CMD_RBLOCK_ACK;
nfc_write_frame(buf, block_offset);