Initial Arduino IDE based on Processing.

build/shared/lib/avrlib/ads7828.c

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+/*! \file ads7828.c \brief TI ADS7828 12-bit 8ch A/D Converter Driver Library. */
+//*****************************************************************************
+//
+// File Name	: 'ads7828.c'
+// Title		: TI ADS7828 12-bit 8ch A/D Converter Driver Library
+// Author		: Pascal Stang - Copyright (C) 2004
+// Created		: 2004.02.10
+// Revised		: 2004.02.19
+// Version		: 0.1
+// Target MCU	: Atmel AVR Series
+// Editor Tabs	: 4
+//
+// NOTE: This code is currently below version 1.0, and therefore is considered
+// to be lacking in some functionality or documentation, or may not be fully
+// tested.  Nonetheless, you can expect most functions to work.
+//
+// This code is distributed under the GNU Public License
+//		which can be found at http://www.gnu.org/licenses/gpl.txt
+//
+//*****************************************************************************
+
+#include <avr/io.h>
+#include <avr/signal.h>
+#include <avr/interrupt.h>
+
+#include "global.h"
+#include "i2c.h"
+#include "ads7828.h"
+
+// global variables
+u08 Ads7282RefMode;
+
+// Functions
+u08 ads7828Init(u08 i2cAddr)
+{
+	u08 channel = 0x80;
+
+	// setup default A/D voltage reference
+	ads7828SetReference(0);
+
+	// issue a convserion to test chip presence
+	// return TRUE if chip detected
+	// return FALSE if chip does not respond
+	return (i2cMasterSendNI(i2cAddr, 1, &channel) == I2C_OK);
+}
+
+u16 ads7828Convert(u08 i2cAddr, u08 channel)
+{
+	// re-order channel bits for
+	// logical single-ended channel selection
+	// channel bit0 -> C2
+	// channel bit1 -> C0
+	// channel bit2 -> C1
+	channel = (((channel>>1) | (channel&0x01)<<2)<<4) | ADS7828_CMD_SD;
+	// do conversion
+	return ads7828ConvertRaw(i2cAddr, channel);
+}
+
+u16 ads7828ConvertDiff(u08 i2cAddr, u08 channel)
+{
+	// clear single-ended channel bit
+	channel = (channel&0x07)<<4;
+	// do conversion
+	return ads7828ConvertRaw(i2cAddr, channel);
+}
+
+u16 ads7828ConvertRaw(u08 i2cAddr, u08 channel)
+{
+	u08 buffer[2];
+	// combine raw channel and reference bits
+	channel &= 0xF0;
+	channel |= Ads7282RefMode;
+	// start conversion on requested channel
+	i2cMasterSendNI(i2cAddr, 1, &channel);
+	// retrieve conversion result
+	i2cMasterReceiveNI(i2cAddr, 2, buffer);
+	// pack bytes and return result
+	return ((buffer[0]<<8) | buffer[1]);
+}
+
+void ads7828SetReference(u08 ref)
+{
+	if(ref)
+	{
+		// use internal reference
+		Ads7282RefMode = ADS7828_CMD_PDMODE2;
+	}
+	else
+	{
+		// use external reference
+		Ads7282RefMode = ADS7828_CMD_PDMODE0;
+	}
+}