Initial commit of files

src/libPIC/ser_init.c

@@ -0,0 +1,154 @@
+/*****************************************************************************
+ * Copyright (C) 2008
+ * ProbeStar Telematics, LLC
+ * All Rights Reserved.  Proprietary and Confidential.
+ *============================================================================
+ * Serial Initialization & Interrupt Handler
+ *----------------------------------------------------------------------------
+ * Serial port driver loop using USART, interrupt driven.
+*****************************************************************************/
+
+/*****************************************************************************
+ * includes
+*****************************************************************************/
+
+#include "system.h"
+#include "serial.h"
+#include "delay.h"
+#include "queue.h"
+
+/*****************************************************************************
+ * defines
+*****************************************************************************/
+
+/*****************************************************************************
+ * macros
+*****************************************************************************/
+
+/*****************************************************************************
+ * structs & typedefs
+*****************************************************************************/
+
+/*****************************************************************************
+ * global constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * global variables
+*****************************************************************************/
+
+// interrupt driven serial i/o uses queues
+SERBANK Queue g_qSerialRx = { 0, 0, 0, 0 };
+SERBANK Queue g_qSerialTx = { 0, 0, 0, 0 };
+
+/*****************************************************************************
+ * static constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * static variables
+*****************************************************************************/
+
+static LIBBANK BYTE byRx = 0;
+static LIBBANK BYTE byTx = 0;
+
+/*****************************************************************************
+ * static prototypes
+*****************************************************************************/
+
+/*****************************************************************************
+ * C functions
+*****************************************************************************/
+
+void SerialInit( void )
+{
+	// fix these
+	RC6 = 1;
+	RC7 = 1;
+	TRISC6 = 0;
+	TRISC7 = 1;
+
+	// baud rate
+	SerialBaud( BAUD );
+
+	// asynchronous serial
+	// recv, 8 bits, continuous
+	RCSTA = 0b10010000;
+	// xmit, 8 bits, high speed
+	TXSTA = 0b00100110;
+
+	CREN = 0;
+	CREN = 1;
+}
+
+void SerialAlloc( BYTE *pbyTx, BYTE nTx, BYTE *pbyRx, BYTE nRx )
+{
+	QueueAlloc( &g_qSerialTx, pbyTx, nTx );
+	QueueAlloc( &g_qSerialRx, pbyRx, nRx );
+	if ( nTx )
+	{
+		RCIE = 1;
+#ifdef _PIC18
+		RCIP = 1;
+#endif
+	}
+	if ( nRx )
+	{
+		TXIE = 0;	// turned on by putch()
+#ifdef _PIC18
+		TXIP = 1;
+#endif
+	}
+	RCIF = TXIF = 0;
+}
+
+void SerialClear( void )
+{
+	CREN = 0;
+	CREN = 1;
+	QueueClear( &g_qSerialTx );
+	QueueClear( &g_qSerialRx );
+	getchflush();
+}
+
+void SerialHandler( void )
+{
+	// RC7/RX
+	if ( RCIF )
+	{
+		// check queue, lose a byte if necessary
+		while ( _QueueFull( g_qSerialRx ) )
+			_QueueGet( g_qSerialRx, byRx );
+
+		// read char
+		byRx = RCREG;
+                _QueuePut( g_qSerialRx, byRx );
+
+		// doesn't handle overflow, so app had better have big buffer
+		if ( OERR )
+		{
+			// overrun error (lost data)
+			CREN = 0;
+			CREN = 1;
+		}
+		RCIF = 0;
+	}
+	// RC6/TX
+	if ( TXIF )
+	{
+		// ready to xmit
+		byTx = _QueueCount( g_qSerialTx );
+		if ( byTx )
+		{
+			// output from queue
+			_QueueGet( g_qSerialTx, TXREG );
+			byTx--;
+		}
+		if ( byTx == 0 )
+		{
+			// nothing left, disable
+			TXIE = 0;
+		}
+		TXIF = 0;
+	}
+}