You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
178 lines
7.4 KiB
178 lines
7.4 KiB
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2009.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.fourwalledcubicle.com
|
|
*/
|
|
|
|
/*
|
|
Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, and distribute this software
|
|
and its documentation for any purpose and without fee is hereby
|
|
granted, provided that the above copyright notice appear in all
|
|
copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaim all warranties with regard to this
|
|
software, including all implied warranties of merchantability
|
|
and fitness. In no event shall the author be liable for any
|
|
special, indirect or consequential damages or any damages
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* ADC driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
|
|
*
|
|
* \note This file should not be included directly. It is automatically included as needed by the ADC driver
|
|
* dispatch header located in LUFA/Drivers/AT90USBXXX/ADC.h.
|
|
*/
|
|
|
|
#ifndef __ADC_AT90USBXXX67_H__
|
|
#define __ADC_AT90USBXXX67_H__
|
|
|
|
/* Includes: */
|
|
#include <avr/io.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "../../../Common/Common.h"
|
|
|
|
/* Enable C linkage for C++ Compilers: */
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Preprocessor Checks: */
|
|
#if !defined(INCLUDE_FROM_ADC_H)
|
|
#error Do not include this file directly. Include LUFA/Drivers/AT90USBXXX/ADC.h instead.
|
|
#endif
|
|
|
|
/* Public Interface - May be used in end-application: */
|
|
/* Macros: */
|
|
/** Initializes the ADC, ready for conversions. This must be called before any other ADC operations.
|
|
* The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and
|
|
* prescaler masks.
|
|
*/
|
|
#define ADC_Init(mode) MACROS{ ADCSRA = ((1 << ADEN) | mode); }MACROE
|
|
|
|
/** Turns off the ADC. If this is called, any further ADC operations will require a call to the
|
|
* ADC_Init() macro before the ADC can be used again.
|
|
*/
|
|
#define ADC_Off() MACROS{ ADCSRA = 0; }MACROE
|
|
|
|
/** Indicates if the ADC is enabled. This macro will return boolean true if the ADC subsystem is
|
|
* currently enabled, or false otherwise.
|
|
*/
|
|
#define ADC_GetStatus() ((ADCSRA & (1 << ADEN)) ? true : false)
|
|
|
|
/** Indicates if the current ADC conversion is completed, or still in progress. This returns boolean
|
|
* false if the reading is still taking place, or true if the conversion is complete and ready to be
|
|
* read out with ADC_GetResult().
|
|
*/
|
|
#define ADC_IsReadingComplete() (!(ADCSRA & (1 << ADSC)))
|
|
|
|
/** Returns the result of the last conversion, as a 16-bit wide integer. */
|
|
#define ADC_GetResult() ADC
|
|
|
|
/** Reference mask, for using the voltage present at the AVR's AREF pin for the ADC reference. */
|
|
#define ADC_REFERENCE_AREF 0
|
|
|
|
/** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */
|
|
#define ADC_REFERENCE_AVCC (1 << REFS0)
|
|
|
|
/** Reference mask, for using the internally generated 2.56V reference voltage as the ADC reference. */
|
|
#define ADC_REFERENCE_INT2560MV ((1 << REFS1)| (1 << REFS0))
|
|
|
|
/** Left-adjusts the 10-bit ADC result, so that the upper 8 bits of the value returned by the
|
|
* ADC_GetResult() macro contain the 8 most significant bits of the result. */
|
|
#define ADC_LEFT_ADJUSTED (1 << ADLAR)
|
|
|
|
/** Right-adjusts the 10-bit ADC result, so that the lower 8 bits of the value returned by the
|
|
* ADC_GetResult() macro contain the 8 least significant bits of the result. */
|
|
#define ADC_RIGHT_ADJUSTED (0 << ADLAR)
|
|
|
|
/** Sets the ADC mode to free running, so that conversions take place continuously as fast as the ADC
|
|
* is capable of at the given input clock speed. */
|
|
#define ADC_FREE_RUNNING (1 << ADATE)
|
|
|
|
/** Sets the ADC mode to single conversion, so that only a single conversion will take place before
|
|
* the ADC returns to idle. */
|
|
#define ADC_SINGLE_CONVERSION (0 << ADATE)
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 2 the AVR's system clock. */
|
|
#define ADC_PRESCALE_2 (1 << ADPS0)
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */
|
|
#define ADC_PRESCALE_4 (1 << ADPS1)
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 8 the AVR's system clock. */
|
|
#define ADC_PRESCALE_8 ((1 << ADPS0) | (1 << ADPS1))
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */
|
|
#define ADC_PRESCALE_16 (1 << ADPS2)
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 32 the AVR's system clock. */
|
|
#define ADC_PRESCALE_32 ((1 << ADPS2) | (1 << ADPS0))
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 64 the AVR's system clock. */
|
|
#define ADC_PRESCALE_64 ((1 << ADPS2) | (1 << ADPS1))
|
|
|
|
/** Sets the ADC input clock to prescale by a factor of 128 the AVR's system clock. */
|
|
#define ADC_PRESCALE_128 ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0))
|
|
|
|
/* Inline Functions: */
|
|
/** Configures the given ADC channel, ready for ADC conversions. This function sets the
|
|
* associated port pin as an input and disables the digital portion of the I/O to reduce
|
|
* power consumption.
|
|
*
|
|
* \param Channel ADC channel number to set up for conversions
|
|
*/
|
|
static inline void ADC_SetupChannel(const uint8_t Channel)
|
|
{
|
|
DDRD &= ~(1 << Channel);
|
|
DIDR0 |= (1 << Channel);
|
|
}
|
|
|
|
/** Starts the reading of the given channel, but does not wait until the conversion has completed.
|
|
* Once executed, the conversion status can be determined via the ADC_IsReadingComplete() macro and
|
|
* the result read via the ADC_GetResult() macro.
|
|
*
|
|
* \param MUXMask Mask comprising of an ADC channel number, reference mask and adjustment mask
|
|
*/
|
|
static inline void ADC_StartReading(const uint8_t MUXMask)
|
|
{
|
|
ADMUX = MUXMask;
|
|
|
|
ADCSRA |= (1 << ADSC);
|
|
}
|
|
|
|
/** Performs a complete single reading from channel, including a polling spinloop to wait for the
|
|
* conversion to complete, and the returning of the converted value.
|
|
*
|
|
* \param MUXMask Mask comprising of an ADC channel number, reference mask and adjustment mask
|
|
*/
|
|
static inline uint16_t ADC_GetChannelReading(const uint8_t MUXMask) ATTR_WARN_UNUSED_RESULT;
|
|
static inline uint16_t ADC_GetChannelReading(const uint8_t MUXMask)
|
|
{
|
|
ADC_StartReading(MUXMask);
|
|
|
|
while (!(ADC_IsReadingComplete()));
|
|
|
|
return ADC_GetResult();
|
|
}
|
|
|
|
/* Disable C linkage for C++ Compilers: */
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif
|