Initial commit of files

src/libPIC/ad_max355.c

@@ -0,0 +1,91 @@
+/*****************************************************************************
+ * Copyright (C) 2008
+ * ProbeStar Telematics, LLC
+ * All Rights Reserved.  Proprietary and Confidential.
+ *============================================================================
+ * MAX 255 A/D Multiplexor
+ *----------------------------------------------------------------------------
+ * Details
+*****************************************************************************/
+
+/*****************************************************************************
+ * includes
+*****************************************************************************/
+
+#include "system.h"
+#include "analog.h"
+#include "delay.h"
+
+/*****************************************************************************
+ * defines
+*****************************************************************************/
+
+/*****************************************************************************
+ * macros
+*****************************************************************************/
+
+/*****************************************************************************
+ * structs & typedefs
+*****************************************************************************/
+
+/*****************************************************************************
+ * global constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * global variables
+*****************************************************************************/
+
+/*****************************************************************************
+ * static constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * static variables
+*****************************************************************************/
+
+/*****************************************************************************
+ * static prototypes
+*****************************************************************************/
+
+/*****************************************************************************
+ * C functions
+*****************************************************************************/
+#ifdef ADMUX_MAX355
+
+// supports two MAX355 Muxes
+void AdMax355Mux( BYTE c )
+{
+	// call with channel number 0..7
+
+	// turn mux off
+	ADMUX_ENABLE0 = 0;
+#ifdef ADMUX_ENABLE1
+	ADMUX_ENABLE1 = 0;
+#endif
+	// wait to transition off
+	DelayNs0400();
+
+	// mux off
+	if ( c == 0xff )
+		return;
+
+	// select channel
+	ADMUX_A0 = ( c & 1 ) ? 1 : 0;
+	ADMUX_A1 = ( c & 2 ) ? 1 : 0;
+
+	// wait to switch
+	DelayNs0400();
+
+#ifdef ADMUX_ENABLE1
+	if ( c & 4 )
+		ADMUX_ENABLE1 = 1;		// 4..7
+	else
+		ADMUX_ENABLE0 = 1;		// 0..3
+#else
+	ADMUX_ENABLE0 = 1;
+#endif
+	// wait to settle
+	DelayNs2000();
+}
+#endif