Set up ring buffer overflow signalling and a little debugging.

DMRIdleRX.cpp

@@ -112,7 +112,7 @@ void CDMRIdleRX::processSample(q15_t sample)
         errs += countBits8((sync[i] & DMR_SYNC_BYTES_MASK[i]) ^ DMR_MS_DATA_SYNC_BYTES[i]);
 
       if (errs <= MAX_SYNC_BYTES_ERRS) {
-        DEBUG4("DMRIdleRX: data sync found pos/centre/threshold", m_dataPtr, centre, threshold);
+        DEBUG3("DMRIdleRX: data sync found centre/threshold", centre, threshold);
         m_maxCorr   = corr;
         m_centre    = centre;
         m_threshold = threshold;

DMRSlotRX.cpp

@@ -246,6 +246,11 @@ void CDMRSlotRX::correlateSync(q15_t sample)
 void CDMRSlotRX::samplesToBits(uint16_t start, uint8_t count, uint8_t* buffer, uint16_t offset, q15_t centre, q15_t threshold)
 {
   for (uint8_t i = 0U; i < count; i++, start += DMR_RADIO_SYMBOL_LENGTH) {
+    if (m_control == 0x20U || m_control == 0x40U) {
+      if (i == 77U)
+        DEBUG4("DMRSlotRX: slot/frame pos/sample pos", m_slot ? 2U : 1U, i, start);
+    }
+
     q15_t sample = m_buffer[start] - centre;
 
     if (sample < -threshold) {

IO.cpp

@@ -401,3 +401,13 @@ bool CIO::hasADCOverflow()
   return overflow;
 }
 
+bool CIO::hasTXOverflow()
+{
+  return m_txBuffer.hasOverflowed();
+}
+
+bool CIO::hasRXOverflow()
+{
+  return m_rxBuffer.hasOverflowed();
+}
+

IO.h

@@ -43,6 +43,9 @@ public:
 
   bool hasADCOverflow();
 
+  bool hasTXOverflow();
+  bool hasRXOverflow();
+
 private:
 #if defined(__MBED__)
   DigitalOut           m_pinPTT;

SampleRB.cpp

@@ -27,7 +27,8 @@ m_samples(NULL),
 m_control(NULL),
 m_head(0U),
 m_tail(0U),
-m_full(false)
+m_full(false),
+m_overflow(false)
 {
   m_samples = new uint16_t[length];
   m_control = new uint8_t[length];
@@ -65,8 +66,10 @@ void CSampleRB::put(uint16_t sample, uint8_t control)
   if (m_head >= m_length)
     m_head = 0U;
 
-  if (m_head == m_tail)
+  if (m_head == m_tail) {
+    m_overflow = true;
     m_full     = true;
+  }
 }
 
 void CSampleRB::get(uint16_t& sample, uint8_t& control)
@@ -81,3 +84,12 @@ void CSampleRB::get(uint16_t& sample, uint8_t& control)
     m_tail = 0U;
 }
 
+bool CSampleRB::hasOverflowed()
+{
+  bool overflow = m_overflow;
+
+  m_overflow = false;
+
+  return overflow;
+}
+

SampleRB.h

@@ -39,6 +39,8 @@ public:
 
   void get(uint16_t& sample, uint8_t& control);
 
+  bool hasOverflowed();
+
 private:
   uint16_t           m_length;
   volatile uint16_t* m_samples;
@@ -46,6 +48,7 @@ private:
   volatile uint16_t  m_head;
   volatile uint16_t  m_tail;
   volatile bool      m_full;
+  bool               m_overflow;
 };
 
 #endif

SerialPort.cpp

@@ -56,7 +56,7 @@ const uint8_t MMDVM_DEBUG4       = 0xF4U;
 const uint8_t MMDVM_DEBUG5       = 0xF5U;
 const uint8_t MMDVM_SAMPLES      = 0xF8U;
 
-const uint8_t HARDWARE[]         = "MMDVM 20160113 (D-Star/DMR/System Fusion)";
+const uint8_t HARDWARE[]         = "MMDVM 20160114 (D-Star/DMR/System Fusion)";
 
 const uint8_t PROTOCOL_VERSION   = 1U;
 
@@ -120,6 +120,12 @@ void CSerialPort::getStatus() const
   if (io.hasADCOverflow())
     reply[5U] |= 0x02U;
 
+  if (io.hasRXOverflow())
+    reply[5U] |= 0x04U;
+
+  if (io.hasTXOverflow())
+    reply[5U] |= 0x08U;
+
   if (m_dstarEnable)
     reply[6U] = dstarTX.getSpace();
   else