[iec] fix release ATN wait on bus process

Author: idolpx

lib/bus/iec/iec.cpp

@@ -483,27 +483,28 @@ void systemBus::read_command()
         }
     }
 
-    //if ( state == BUS_ACTIVE )  // Normal behaviour is to ignore everything if it's not for us
-    if ( state == BUS_PROCESS )  // Use this to sniff the secondary commands
+    if ( state == BUS_ACTIVE )  // Normal behaviour is to ignore everything if it's not for us
+    //if ( state == BUS_PROCESS )  // Use this to sniff the secondary commands
     {
         if ( !isDeviceEnabled( data.device ) )
         {
             // Is this command for us?
             state = BUS_RELEASE; // NOPE!
         }
     }
-    else if ( state == BUS_PROCESS )
+
+    if ( state == BUS_PROCESS )
     {
         // *** IMPORTANT! This helps keep us in sync!
         // Sometimes ATN isn't released immediately. Wait for ATN to be
         // released before trying to process the command. 
         // Long ATN delay (>1.5ms) seems to occur more frequently with VIC-20.
-        //pull ( PIN_IEC_SRQ );
+        pull ( PIN_IEC_SRQ );
         protocol->timeoutWait ( PIN_IEC_ATN, RELEASED, TIMEOUT_DEFAULT, false );
 
         // Delay after ATN is RELEASED
         //protocol->wait( TIMING_Ttk, false );
-        //release ( PIN_IEC_SRQ );
+        release ( PIN_IEC_SRQ );
     }
 
 
@@ -870,7 +871,7 @@ bool IRAM_ATTR systemBus::turnAround()
     */
 
     // Wait for CLK to be released
-    //pull ( PIN_IEC_SRQ );
+    pull ( PIN_IEC_SRQ );
     if (protocol->timeoutWait(PIN_IEC_CLK_IN, RELEASED, TIMEOUT_Ttlta) == TIMEOUT_Ttlta)
     {
         Debug_printv("Wait until the computer releases the CLK line\r\n");
@@ -880,7 +881,7 @@ bool IRAM_ATTR systemBus::turnAround()
     }
     release ( PIN_IEC_DATA_OUT );
     pull ( PIN_IEC_CLK_OUT );
-    //release ( PIN_IEC_SRQ );
+    release ( PIN_IEC_SRQ );
 
     // 80us minimum delay after TURNAROUND
     // *** IMPORTANT!

lib/bus/iec/protocol/cpbstandardserial.cpp

@@ -132,9 +132,9 @@ uint8_t CPBStandardSerial::receiveByte()
     // without  the Clock line going to true, it has a special task to perform: note EOI.
 
     //IEC.pull ( PIN_IEC_SRQ );
-    //if ( timeoutWait ( PIN_IEC_CLK_IN, PULLED, TIMING_Tye, false ) == TIMING_Tye )
-    timer_start( TIMING_Tye );
-    while ( IEC.status ( PIN_IEC_CLK_IN ) != PULLED )
+    if ( timeoutWait ( PIN_IEC_CLK_IN, PULLED, TIMING_Tye, false ) == TIMING_Tye )
+    // timer_start( TIMING_Tye );
+    // while ( IEC.status ( PIN_IEC_CLK_IN ) != PULLED )
     {
         // INTERMISSION: EOI
         // If the Ready for Data signal isn't acknowledged by the talker within 200 microseconds, the
@@ -152,7 +152,7 @@ uint8_t CPBStandardSerial::receiveByte()
 
         //IEC.pull ( PIN_IEC_SRQ );
 
-        if ( timer_timedout )
+        //if ( timer_timedout )
         {
             timer_timedout = false;
             IEC.flags |= EOI_RECVD;
@@ -162,6 +162,9 @@ uint8_t CPBStandardSerial::receiveByte()
             IEC.pull ( PIN_IEC_DATA_OUT );
             wait ( TIMING_Tei );
             IEC.release ( PIN_IEC_DATA_OUT );
+
+            // Wait for clock line to be pulled
+            timeoutWait ( PIN_IEC_CLK_IN, PULLED, TIMING_Tye, false );
         }
 
         //usleep( 2 );