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cpu/cc2538: Prevent underflow of the RX FIFO

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This commit is contained in:
Matthew Bradbury 2020-04-20 12:36:52 +01:00
parent cac350901f
commit f0e48f0741
1 changed files with 10 additions and 4 deletions
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14
cpu/cc2538/radio/cc2538_rf_netdev.c
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@ -299,6 +299,12 @@ static int _recv(netdev_t *netdev, void *buf, size_t len, void *info)
size_t pkt_len;
if (buf == NULL) {
/* Check that the last byte of a new frame has been received */
if (RFCORE->XREG_FSMSTAT1bits.FIFOP == 0) {
DEBUG_PRINT("cc2538_rf: Frame has not finished being received\n");
return -EAGAIN;
}
/* GNRC wants to know how much data we've got for it */
pkt_len = rfcore_read_byte();
@ -329,11 +335,11 @@ static int _recv(netdev_t *netdev, void *buf, size_t len, void *info)
rfcore_read_fifo(buf, pkt_len);
int8_t rssi_val = rfcore_read_byte() + CC2538_RSSI_OFFSET;
uint8_t crc_corr_val = rfcore_read_byte();
if (info != NULL && RFCORE->XREG_RSSISTATbits.RSSI_VALID) {
uint8_t corr_val;
int8_t rssi_val;
netdev_ieee802154_rx_info_t *radio_info = info;
rssi_val = rfcore_read_byte() + CC2538_RSSI_OFFSET;
RFCORE_ASSERT(rssi_val > CC2538_RF_SENSITIVITY);
@ -341,7 +347,7 @@ static int _recv(netdev_t *netdev, void *buf, size_t len, void *info)
* received packet */
radio_info->rssi = -CC2538_RF_SENSITIVITY + rssi_val;
corr_val = rfcore_read_byte() & CC2538_CORR_VAL_MASK;
uint8_t corr_val = crc_corr_val & CC2538_CORR_VAL_MASK;
if (corr_val < CC2538_CORR_VAL_MIN) {
corr_val = CC2538_CORR_VAL_MIN;