From 63d0944063b6f240fe0c68ef9b61d4dd906d9fc1 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Tue, 17 Nov 2020 19:12:00 +0100
Subject: initial checkin

---
 sketches/6502_addr_read.ino | 48 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 sketches/6502_addr_read.ino

(limited to 'sketches')

diff --git a/sketches/6502_addr_read.ino b/sketches/6502_addr_read.ino
new file mode 100644
index 0000000..415c4b7
--- /dev/null
+++ b/sketches/6502_addr_read.ino
@@ -0,0 +1,48 @@
+char addr_pin[16];
+char data_pin[8];
+const int clock_pin = 2;
+const int rw_pin = 3;
+
+void setup( )
+{
+  for( int i = 0; i < 16; i++ ) {
+    addr_pin[i] = 52 - i*2;
+    pinMode( addr_pin[i], INPUT );
+  }
+  for( int i = 0; i < 8; i++ ) {
+    data_pin[i] = 53 - i*2;
+    pinMode( data_pin[i], INPUT );
+  }
+  pinMode( clock_pin, INPUT );
+  pinMode( rw_pin, INPUT );
+  attachInterrupt( digitalPinToInterrupt( clock_pin ), onClk, RISING );
+  Serial.begin( 115200 );
+}
+
+void onClk( )
+{
+  unsigned int addr = 0;
+  for( int i = 0; i < 16; i++ ) {
+    int b = ( digitalRead( addr_pin[i] ) == HIGH  ) ? 1 : 0;
+    Serial.print( b );
+    addr = ( addr << 1 ) + b;
+  }
+  Serial.print( " " );
+  unsigned int data = 0;
+  for( int i = 0; i < 8; i++ ) {
+    int b = ( digitalRead( data_pin[i] ) == HIGH  ) ? 1 : 0;
+    Serial.print( b );
+    data = ( data << 1 ) + b;
+  }
+  Serial.print( " " );
+
+  char rw = ( digitalRead( rw_pin ) == HIGH ) ? 'r' : 'w';
+
+  char output[32];
+  sprintf( output, "%04x %c %02x", addr, rw, data );
+  Serial.println( output );
+}
+
+void loop( )
+{
+}
-- 
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