/**
 * \file
 * <!--
 * This file is part of BeRTOS.
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 * it under the terms of the GNU General Public License as published by
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 * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
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 *
 * \brief ADC hardware-specific definition
 *
 * \author Daniele Basile <asterix@develer.com>
 */

#ifndef DRV_ADC_AT91_H
#define DRV_ADC_AT91_H

#include <hw/hw_cpufreq.h>

#include "cfg/cfg_adc.h"

#include <cfg/compiler.h>

/**
 * ADC config define.
 */
#define ADC_MUX_MAXCH          8 //Max number of channel for ADC.
#define ADC_BITS              10 //Bit resolution for ADC converter.

/**
 * Macro for computing correct value to write into ADC
 * register.
 */
#define ADC_COMPUTED_PRESCALER    (DIV_ROUNDUP(CPU_FREQ, 2 * CONFIG_ADC_CLOCK) - 1)
#define ADC_COMPUTED_CLOCK        (CPU_FREQ / ((ADC_COMPUTED_PRESCALER + 1) * 2))
#define ADC_COMPUTED_STARTUPTIME  (((CONFIG_ADC_STARTUP_TIME * ADC_COMPUTED_CLOCK) / 8000000UL) - 1)
#define ADC_COMPUTED_SHTIME       ((uint32_t)((CONFIG_ADC_SHTIME * (uint64_t)ADC_COMPUTED_CLOCK) / 1000000000UL) - 1)

/**
 * Init pins macro for adc.
 */

/**
 * Define PIO controller for enable ADC function.
 * \{
 */
#if CPU_ARM_SAM7X
	#define ADC_PIO_DISABLE           PIOB_PDR
	#define ADC_PIO_EN_FUNC           PIOB_ASR

#elif CPU_ARM_SAM7S_LARGE
	#define ADC_PIO_DISABLE           PIOA_PDR
	#define ADC_PIO_EN_FUNC           PIOA_BSR

#else
	#error No ADC pins name definitions for selected ARM CPU
#endif
/*\}*/

/**
 * Init the ADC pins.
 * Implement it if necessary.
 */
#define ADC_INIT_PINS() \
	do { \
	} while (0)

void adc_hw_select_ch(uint8_t ch);
uint16_t adc_hw_read(void);
void adc_hw_init(void);

#endif /* DRV_ADC_AT91_H */