OpenThread CC2538 TX issue, possible fix

gistfile1.txt

stuartl@vk4msl-ws ~/vrt/projects/widesky/hub/hal $ diff -u third_party/openthread/examples/platforms/cc2538/radio.c src/radio.c 
--- third_party/openthread/examples/platforms/cc2538/radio.c	2017-08-01 12:48:31.466864595 +1000
+++ src/radio.c	2017-11-24 18:56:04.074493486 +1000
@@ -73,23 +73,20 @@
     uint8_t mTxPowerReg;
 } TxPowerTable;
 
-// The transmit power table, the values are from SmartRF Studio 2.4.0
+// The transmit power table, the values are from application note 130
 static const TxPowerTable sTxPowerTable[] =
 {
-    {  7, 0xFF },
-    {  5, 0xED },
-    {  3, 0xD5 },
-    {  1, 0xC5 },
-    {  0, 0xB6 },
-    { -1, 0xB0 },
-    { -3, 0xA1 },
-    { -5, 0x91 },
-    { -7, 0x88 },
-    { -9, 0x72 },
-    { -11, 0x62 },
-    { -13, 0x58 },
-    { -15, 0x42 },
-    { -24, 0x00 },
+    { 22, 0xFF },   /* 22.0dBm =~ 158.5mW */
+    { 21, 0xD5 },   /* 20.9dBm =~ 123.0mW */
+    { 20, 0xC5 },   /* 20.1dBm =~ 102.3mW */
+    { 19, 0xB0 },   /* 19.0dBm =~  79.4mW */
+    { 18, 0xA1 },   /* 17.8dBm =~  60.3mW */
+    { 16, 0x91 },   /* 16.4dBm =~  43.7mW */
+    { 15, 0x88 },   /* 14.9dBm =~  30.9mW */
+    { 13, 0x72 },   /* 13.0dBm =~  20.0mW */
+    { 11, 0x62 },   /* 11.0dBm =~  12.6mW */
+    { 10, 0x58 },   /*  9.5dBm =~   8.9mW */
+    {  8, 0x42 },   /*  7.5dBm =~   5.6mW */
 };
 
 static otRadioFrame sTransmitFrame;
@@ -105,6 +102,8 @@
 static otRadioState sState = OT_RADIO_STATE_DISABLED;
 static bool sIsReceiverEnabled = false;
 
+#define RFCORE_XREG_FSMSTAT0	0x40088648
+
 void enableReceiver(void)
 {
     if (!sIsReceiverEnabled)
@@ -340,6 +339,14 @@
         sState = OT_RADIO_STATE_TRANSMIT;
         sTransmitError = OT_ERROR_NONE;
 
+	while ((HWREG(RFCORE_XREG_FSMSTAT0) & 0x3f) == 0x11) {
+		/* We're in RX overrun, flush buffer */
+		otLogCritPlat(sInstance, "RX buffer overrun, aborting TX (FSMSTAT1=0x%08x)",
+				HWREG(RFCORE_XREG_FSMSTAT1));
+		HWREG(RFCORE_SFR_RFST) = RFCORE_SFR_RFST_INSTR_FLUSHRX;
+		HWREG(RFCORE_SFR_RFST) = RFCORE_SFR_RFST_INSTR_FLUSHRX;
+	}
+
         while (HWREG(RFCORE_XREG_FSMSTAT1) & RFCORE_XREG_FSMSTAT1_TX_ACTIVE);
 
         // flush txfifo
@@ -358,7 +365,33 @@
         setChannel(aFrame->mChannel);
         setTxPower(aFrame->mPower);
 
-        while ((HWREG(RFCORE_XREG_FSMSTAT1) & 1) == 0);
+#ifdef RADIO_TIMEOUT
+	i = RADIO_TIMEOUT;
+#endif
+	while ((HWREG(RFCORE_XREG_FSMSTAT1) & 1) == 0) {
+#ifdef RADIO_TIMEOUT
+		if (!i) {
+			otLogCritPlat(sInstance,
+					"Transmitter is stuck!!! FSMSTAT0=0x%08x FSMSTAT1=0x%08x",
+					HWREG(RFCORE_XREG_FSMSTAT0), HWREG(RFCORE_XREG_FSMSTAT1));
+			i = RADIO_TIMEOUT;
+		} else {
+			i--;
+		}
+#endif
+
+		switch (HWREG(RFCORE_XREG_FSMSTAT0) & 0x3f) {
+		case 0x11:
+			/* We're in RX overrun, flush buffer and abort */
+			otLogCritPlat(sInstance, "RX buffer overrun, aborting TX (FSMSTAT1=0x%08x)",
+					HWREG(RFCORE_XREG_FSMSTAT1));
+			HWREG(RFCORE_SFR_RFST) = RFCORE_SFR_RFST_INSTR_FLUSHRX;
+			HWREG(RFCORE_SFR_RFST) = RFCORE_SFR_RFST_INSTR_FLUSHRX;
+			return OT_ERROR_FAILED;
+		default:
+			break;
+		}
+	}
 
         // wait for valid rssi
         while ((HWREG(RFCORE_XREG_RSSISTAT) & RFCORE_XREG_RSSISTAT_RSSI_VALID) == 0);