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cpu/cc2538: Enable CRC checking of received packets #5654

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Jul 25, 2016
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cpu/cc2538: Enable CRC checking of received packets #5654

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13 changes: 10 additions & 3 deletions cpu/cc2538/radio/cc2538_rf_netdev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -300,14 +300,21 @@ static int _recv(netdev2_t *netdev, char *buf, int len, void *info)
/* GNRC wants to know how much data we've got for it */
pkt_len = rfcore_read_byte();

/* If the value of the first byte of the RX FIFO does not correspond
to the amount of data received, then drop the packet. */
if (pkt_len != RFCORE_XREG_RXFIFOCNT) {
/* Make sure pkt_len is sane */
if (pkt_len > CC2538_RF_MAX_DATA_LEN) {
RFCORE_SFR_RFST = ISFLUSHRX;
mutex_unlock(&dev->mutex);
return -EOVERFLOW;
}

/* CRC check */
if (!(rfcore_peek_rx_fifo(pkt_len) & 0x80)) {
/* CRC failed; discard packet */
RFCORE_SFR_RFST = ISFLUSHRX;
mutex_unlock(&dev->mutex);
return -ENODATA;
}

if (len > 0) {
/* GNRC wants us to drop the packet */
RFCORE_SFR_RFST = ISFLUSHRX;
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