From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 30 Apr 2008 13:56:54 +0000 (+0000)
Subject: Add adc driver.
X-Git-Tag: 1.0.0~16
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=211f1718bc7a3553323733eea821a477decf0cc7;p=bertos.git

Add adc driver.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1236 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/bertos/cpu/arm/drv/adc_arm.c b/bertos/cpu/arm/drv/adc_arm.c
new file mode 100644
index 00000000..78878551
--- /dev/null
+++ b/bertos/cpu/arm/drv/adc_arm.c
@@ -0,0 +1,49 @@
+/**
+ * \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 2007 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Low-level ADC module for ARM (inplementation).
+ *
+ *
+ * \version $Id$
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include <cpu/detect.h>
+
+#if CPU_ARM_AT91
+	#include "adc_at91.c"
+/*#elif  Add other ARM families here */
+#else
+	#error Unknown CPU
+#endif
diff --git a/bertos/cpu/arm/drv/adc_arm.h b/bertos/cpu/arm/drv/adc_arm.h
new file mode 100644
index 00000000..63e7dafa
--- /dev/null
+++ b/bertos/cpu/arm/drv/adc_arm.h
@@ -0,0 +1,49 @@
+/**
+ * \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 2007 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Low-level ADC module for ARM (interface).
+ *
+ *
+ * \version $Id$
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include <cpu/detect.h>
+
+#if CPU_ARM_AT91
+	#include "adc_at91.h"
+/*#elif  Add other ARM families here */
+#else
+	#error Unknown CPU
+#endif
diff --git a/bertos/cpu/arm/drv/adc_at91.c b/bertos/cpu/arm/drv/adc_at91.c
new file mode 100644
index 00000000..59fd1c68
--- /dev/null
+++ b/bertos/cpu/arm/drv/adc_at91.c
@@ -0,0 +1,198 @@
+/**
+ * \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 implementation
+ *
+ * This ADC module should be use both whit kernel or none.
+ * If you are using a kernel, the adc drive does not wait the finish of
+ * conversion but use a singal every time a required conversion are 
+ * ended. This signal wake up a process that return a result of 
+ * conversion. Otherwise, if you not use a kernl, this module wait
+ * whit a loop the finishing of conversion.
+ *
+ *
+ * \version $Id$
+ * 
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#include "adc_at91.h"
+
+#include <drv/adc.h>
+
+#include <cfg/macros.h>
+#include <cfg/compiler.h>
+
+#include <io/arm.h>
+
+#include "appconfig.h"
+
+#if CONFIG_KERNEL
+	#include <cfg/module.h>
+	#include <config_kern.h>
+	#include <kern/proc.h>
+	#include <kern/signal.h>
+
+
+	#if !CONFIG_KERN_SIGNALS
+		#error Signals must be active to use ADC with kernel
+	#endif
+
+	/* Signal adc convertion end */
+	#define SIG_ADC_COMPLETE SIG_USER0
+
+	/* ADC waiting process */
+	static struct Process *adc_process;
+
+	/**
+	 * ADC ISR.
+	 * Simply signal the adc process that convertion is complete.
+	 */
+	static void ISR_FUNC adc_conversion_end_irq(void)
+	{
+		sig_signal(adc_process, SIG_ADC_COMPLETE);
+
+		/* Inform hw that we have served the IRQ */
+		AIC_EOICR = 0;
+	}
+
+	static void adc_enable_irq(void)
+	{
+
+		// Disable all interrupt
+		ADC_IDR = 0xFFFFFFFF;
+
+		//Register interrupt vector
+		AIC_SVR(ADC_ID) = adc_conversion_end_irq;
+		AIC_SMR(ADC_ID) = AIC_SRCTYPE_INT_EDGE_TRIGGERED;
+		AIC_IECR = BV(ADC_ID);
+
+		//Enable data ready irq
+		ADC_IER = BV(ADC_DRDY);
+	}
+
+#endif /* CONFIG_KERNEL */
+
+
+/**
+ * Select mux channel \a ch.
+ * \todo only first 8 channels are selectable!
+ */
+INLINE void adc_hw_select_ch(uint8_t ch)
+{
+	//Disable all channels
+	ADC_CHDR = ADC_CH_MASK;
+	//Enable select channel
+	ADC_CHER = BV(ch);
+}
+
+
+/**
+ * Start an ADC convertion.
+ * If a kernel is present, preempt until convertion is complete, otherwise
+ * a busy wait on ADCS bit is done.
+ */
+INLINE uint16_t adc_hw_read(void)
+{
+	ASSERT(!(ADC_SR & ADC_EOC_MASK));
+
+	#if CONFIG_KERNEL
+		adc_process = proc_current();
+	#endif
+
+	// Start convertion
+	ADC_CR = BV(ADC_START);
+
+	#if CONFIG_KERNEL
+		// Ensure IRQs enabled.
+		ASSERT(IRQ_ENABLED());
+		sig_wait(SIG_ADC_COMPLETE);
+	#else
+		//Wait in polling until is done
+		while (!(ADC_SR & BV(ADC_DRDY)));
+	#endif
+
+	//Return the last converted data
+	return(ADC_LCDR);
+}
+
+/**
+ * Init ADC hardware.
+ */
+INLINE void adc_hw_init(void)
+{
+	//Init ADC pins.
+	ADC_INIT_PINS();
+
+	/*
+	 * Set adc mode register:
+	 * - Disable hardware trigger and enable software trigger.
+	 * - Select normal mode.
+	 * - Set ADC_BITS bit convertion resolution.
+	 *
+	 * \{
+	 */
+	ADC_MR = 0;
+	#if ADC_BITS == 10
+		ADC_MR &= ~BV(ADC_LOWRES);
+	#elif ADC_BITS == 8
+		ADC_MR |= BV(ADC_LOWRES);
+	#else
+		#error No select bit resolution is supported to this CPU
+	#endif
+	/* \} */
+
+	TRACEMSG("prescaler[%ld], stup[%ld], shtim[%ld]\n",ADC_COMPUTED_PRESCALER,ADC_COMPUTED_STARTUPTIME,ADC_COMPUTED_SHTIME);
+
+
+	//Apply computed prescaler value
+	ADC_MR &= ~ADC_PRESCALER_MASK;
+	ADC_MR |= ((ADC_COMPUTED_PRESCALER << ADC_PRESCALER_SHIFT) & ADC_PRESCALER_MASK);
+	TRACEMSG("prescaler[%ld]\n", (ADC_COMPUTED_PRESCALER << ADC_PRESCALER_SHIFT) & ADC_PRESCALER_MASK);
+
+	//Apply computed start up time
+	ADC_MR &= ~ADC_STARTUP_MASK;
+	ADC_MR |= ((ADC_COMPUTED_STARTUPTIME << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
+	TRACEMSG("sttime[%ld]\n", (ADC_COMPUTED_STARTUPTIME << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
+
+	//Apply computed sample and hold time
+	ADC_MR &= ~ADC_SHTIME_MASK;
+	ADC_MR |= ((ADC_COMPUTED_SHTIME << ADC_SHTIME_SHIFT) & ADC_SHTIME_MASK);
+	TRACEMSG("shtime[%ld]\n", (ADC_COMPUTED_SHTIME << ADC_SHTIME_SHIFT) & ADC_SHTIME_MASK);
+
+	#if CONFIG_KERNEL
+		//Register and enable irq for adc.
+		adc_enable_irq();
+	#endif
+
+}
diff --git a/bertos/cpu/arm/drv/adc_at91.h b/bertos/cpu/arm/drv/adc_at91.h
new file mode 100644
index 00000000..49f0de31
--- /dev/null
+++ b/bertos/cpu/arm/drv/adc_at91.h
@@ -0,0 +1,93 @@
+/**
+ * \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/)
+ *
+ * -->
+ *
+ * \version $Id$
+ *
+ * \brief ADC hardware-specific definition
+ *
+ * \version $Id$
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#ifndef DRV_ADC_AT91_H
+#define DRV_ADC_AT91_H
+
+#include <cfg/compiler.h>
+
+#include "hw_cpu.h"
+#include "appconfig.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    ((CLOCK_FREQ/(2 * CONFIG_ADC_CLOCK)) - 1)
+#define ADC_COMPUTED_STARTUPTIME  (((CONFIG_ADC_STARTUP_TIME * CONFIG_ADC_CLOCK)/ 8000000UL) - 1)
+#define ADC_COMPUTED_SHTIME       (((CONFIG_ADC_SHTIME * CONFIG_ADC_CLOCK)/1000000000UL) - 1)
+
+/**
+ * Init pins macro for adc.
+ */
+
+/**
+ * Define PIO controller for enable ADC function.
+ * \{
+ */
+#if CPU_ARM_AT91SAM7X256
+	#define ADC_PIO_DISABLE           PIOB_PDR
+	#define ADC_PIO_EN_FUNC           PIOB_ASR
+
+#elif CPU_ARM_AT91SAM7S256
+	#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)
+
+
+#endif /* DRV_ADC_AT91_H */