From 44c6c868380a33106cc482118189a5c4fb4316ff Mon Sep 17 00:00:00 2001
From: Rob French <robert@thefrenchfamily.org>
Date: Sun, 3 May 2020 22:00:02 -0500
Subject: [PATCH] Updated CAT to support interoperability with uBITX I/O
 Processor (IOP).

---
 ubitx_20/cat_libs.ino | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/ubitx_20/cat_libs.ino b/ubitx_20/cat_libs.ino
index 608af79..e467f1b 100644
--- a/ubitx_20/cat_libs.ino
+++ b/ubitx_20/cat_libs.ino
@@ -48,6 +48,11 @@
 #define CAT_MODE_FMN            0x88
 
 #define ACK 0
+// KC4UPR--uBITX IOP:  prefixes to determine "mode" of serial transmission
+#define CAT_PREFIX 0xC0
+#define IOP_PREFIX 0xD0
+#define EEPROM_READ_PREFIX 0xE0
+#define EEPROM_WRITE_PREFIX 0xF0
 
 unsigned int skipTimeCount = 0;
 byte CAT_BUFF[5];
@@ -55,6 +60,14 @@ byte CAT_SNDBUFF[5];
 
 void SendCatData(byte sendCount)
 {
+  // KC4UPR--uBITX IOP:  Adding an additional byte at the beginning that
+  // indicates that this is a "CAT mode" transmission.  Extra byte includes
+  // a prefix, as well as the number of bytes being sent.
+  //
+  // NOTE: Need to do some error checking at some point to ensure we don't
+  // try to send more than 15 bytes!!!
+  Serial.write(CAT_PREFIX | sendCount);
+  
   for (byte i = 0; i < sendCount; i++)
     Serial.write(CAT_BUFF[i]);
   //Serial.flush();
@@ -250,6 +263,15 @@ void ReadEEPRom() //for remove warnings.
   byte checkSum = 0;
   byte read1Byte = 0;
 
+  // KC4UPR--uBITX IOP:  Adding an additional byte at the beginning that
+  // indicates that this is a "Memory Manager mode" transmission.
+  // Then we repeat some of the CAT_BUFF data.
+  Serial.write(EEPROM_READ_PREFIX);
+  Serial.write(CAT_BUFF[0]);
+  Serial.write(CAT_BUFF[1]);
+  Serial.write(CAT_BUFF[2]);
+  Serial.write(CAT_BUFF[3]);
+
   Serial.write(0x02); //STX
   checkSum = 0x02;
   //I2C Scanner
@@ -293,6 +315,12 @@ void WriteEEPRom(void)  //for remove warning
   uint16_t eepromStartIndex = CAT_BUFF[0] + CAT_BUFF[1] * 256;
   byte write1Byte = CAT_BUFF[2];
 
+  // KC4UPR--uBITX IOP:  Adding an additional byte at the beginning that
+  // indicates that this is a "Memory Manager mode" transmission.
+  // 
+  // Also indicates that we are going to be sending two bytes of data.
+  Serial.write(EEPROM_WRITE_PREFIX | 2);
+
   //Check Checksum
   if (CAT_BUFF[3] != ((CAT_BUFF[0] + CAT_BUFF[1] + CAT_BUFF[2]) % 256))
   {
@@ -890,4 +918,3 @@ void Init_Cat(long baud, int portConfig)
   Serial.begin(baud, portConfig);
   Serial.flush();
 }
-