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bertos/cpu/arm/drv/adc_at91.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \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 */