Moving specific ADF7021 code to ADF7021.cpp

ADF7021.cpp

@@ -29,6 +29,11 @@
 #include "ADF7021.h"
 #include <math.h>
 
+volatile bool totx_request = false;
+volatile bool torx_request = false;
+volatile bool even = true;
+static uint32_t last_clk = 2;
+
 volatile uint32_t  AD7021_control_word;
 
 uint32_t           ADF7021_RX_REG0;
@@ -162,9 +167,9 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
   // Toggle CE pin for ADF7021 reset
   if(reset) {
     CE_pin(LOW);
-    delay_rx();
+    delay_reset();
     CE_pin(HIGH);
-    delay_rx();
+    delay_reset();
   }
 
   // Check frequency band
@@ -360,9 +365,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
   Send_AD7021_control();
   
   // Delay for coarse IF filter calibration
-  delay_rx();
-  delay_rx();
-  delay_rx();
+  delay_ifcal_coarse();
 
   // Frequency RX (0)
   setRX();
@@ -400,6 +403,117 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
 
 }
 
+void CIO::interrupt()
+{
+  uint8_t bit = 0;
+  
+  if (!m_started)
+    return;
+
+  uint8_t clk = CLK_pin();
+
+  // this is to prevent activation by spurious interrupts
+  // which seem to happen if you send out an control word
+  // needs investigation
+  // this workaround will fail if only rising or falling edge
+  // is used to trigger the interrupt !!!!
+  // TODO: figure out why sending the control word seems to issue interrupts
+  // possibly this is a design problem of the RF7021 board or too long wires
+  // on the breadboard build 
+  // but normally this will not hurt too much
+  if (clk == last_clk) {
+    return;
+  } else {
+    last_clk = clk;
+  }
+
+  // we set the TX bit at TXD low, sampling of ADF7021 happens at rising clock
+  if (m_tx && clk == 0) {
+
+    m_txBuffer.get(bit);
+    even = !even; 
+
+    // use this for tracking issues
+    // P25_pin(even);
+
+#if defined(BIDIR_DATA_PIN)
+    if(bit)
+      RXD_pin_write(HIGH);
+    else
+      RXD_pin_write(LOW);
+#else
+    if(bit)
+      TXD_pin(HIGH);
+    else
+      TXD_pin(LOW);
+#endif
+
+    // wait a brief period before raising SLE
+    if (totx_request == true) { 
+      asm volatile("nop          \n\t"
+                   "nop          \n\t"
+                   "nop          \n\t"
+                   );
+
+      // SLE Pulse, should be moved out of here into class method 
+      // according to datasheet in 4FSK we have to deliver this before 1/4 tbit == 26uS 
+      SLE_pin(HIGH);
+      asm volatile("nop          \n\t"
+                   "nop          \n\t"
+                   "nop          \n\t"
+                   );
+      SLE_pin(LOW);
+      SDATA_pin(LOW);
+
+      // now do housekeeping
+      totx_request = false;
+      // first tranmittted bit is always the odd bit
+      even = false;
+    }
+  }
+  
+  // we sample the RX bit at rising TXD clock edge, so TXD must be 1 and we are not in tx mode
+  if (!m_tx && clk == 1) {
+    if(RXD_pin())
+      bit = 1;
+    else
+      bit = 0;
+
+    m_rxBuffer.put(bit);
+  }
+  
+  if (torx_request == true && even == false && m_tx && clk == 0) { 
+      // that is absolutely crucial in 4FSK, see datasheet:
+      // enable sle after 1/4 tBit == 26uS when sending MSB (even == false) and clock is low 
+      delay_us(26);
+
+      // SLE Pulse, should be moved out of here into class method 
+      SLE_pin(HIGH);
+      asm volatile("nop          \n\t"
+                   "nop          \n\t"
+                   "nop          \n\t"
+                   );
+      SLE_pin(LOW);
+      SDATA_pin(LOW);
+
+      // now do housekeeping
+      m_tx = false;
+      torx_request = false;
+      //last tranmittted bit is always the even bit
+      // since the current bit is a transitional "don't care" bit, never transmitted
+      even = true;
+  }  
+
+  m_watchdog++;
+  m_modeTimerCnt++;
+
+  if(m_scanPauseCnt >= SCAN_PAUSE)
+    m_scanPauseCnt = 0;
+  
+  if(m_scanPauseCnt != 0)
+    m_scanPauseCnt++;
+}
+
 //======================================================================================================================
 void CIO::setTX()
 { 
@@ -416,6 +530,8 @@ void CIO::setTX()
   Data_dir_out(true);  // Data pin output mode
 #endif
 
+  totx_request = true;
+  while(CLK_pin());
 }
 
 //======================================================================================================================
@@ -432,7 +548,11 @@ void CIO::setRX(bool doSle)
 #if defined(BIDIR_DATA_PIN)
   Data_dir_out(false);  // Data pin input mode
 #endif
-  
+
+  if(!doSle) {
+    torx_request = true;
+    while(torx_request) { asm volatile ("nop"); }
+  }
 }
 
 void CIO::setLoDevYSF(bool on)