From 8ba40b07b125a53d66052fa6a00d902f47bf0905 Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Tue, 28 Sep 2010 07:56:57 +0000
Subject: [PATCH] Add first adc implementation module for lm3s.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4320 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/cpu/cortex-m3/drv/adc_lm3s.c | 168 ++++++++++++++++++++++++++++
 bertos/cpu/cortex-m3/drv/adc_lm3s.h |  70 ++++++++++++
 2 files changed, 238 insertions(+)
 create mode 100644 bertos/cpu/cortex-m3/drv/adc_lm3s.c
 create mode 100644 bertos/cpu/cortex-m3/drv/adc_lm3s.h

diff --git a/bertos/cpu/cortex-m3/drv/adc_lm3s.c b/bertos/cpu/cortex-m3/drv/adc_lm3s.c
new file mode 100644
index 00000000..144b95d6
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/adc_lm3s.c
@@ -0,0 +1,168 @@
+/**
+ * \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 2010 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.
+ *
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+
+#include "adc_lm3s.h"
+
+#include <cpu/irq.h>
+
+#include "cfg/cfg_adc.h"
+#include "cfg/cfg_proc.h"
+#include "cfg/cfg_signal.h"
+
+#include <cfg/macros.h>
+#include <cfg/compiler.h>
+#include <cfg/debug.h>
+
+// Define log settings for cfg/log.h.
+#define LOG_LEVEL         ADC_LOG_LEVEL
+#define LOG_FORMAT        ADC_LOG_FORMAT
+#include <cfg/log.h>
+
+#include <drv/adc.h>
+#include <drv/clock_stm32.h>
+#include <drv/gpio_stm32.h>
+
+#include <io/lm3s.h>
+
+
+#if CONFIG_KERN
+	#include <cfg/module.h>
+
+	#include <kern/proc.h>
+	#include <kern/signal.h>
+
+	#include <drv/irq_cm3.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 DECLARE_ISR(adc_conversion_end_irq)
+	{
+		sig_post(adc_process, SIG_ADC_COMPLETE);
+
+		/* Clear the status bit */
+	}
+
+	static void adc_enable_irq(void)
+	{
+		/* Register the IRQ handler */
+		//sysirq_setHandler(ADC_IRQHANDLER, adc_conversion_end_irq);
+	}
+
+#endif /* CONFIG_KERN */
+
+/**
+ * Select mux channel \a ch.
+ * Generally the stm32 cpu family allow us to program the order
+ * of adc channel that we want to read.
+ * In this driver implementation we put as fist channel to read the
+ * select ones.
+ */
+void adc_hw_select_ch(uint8_t ch)
+{
+	/* We sample only from one channel */
+}
+
+/**
+ * Start an ADC convertion.
+ * If a kernel is present, preempt until convertion is complete, otherwise
+ * a busy wait on ADC_DRDY bit is done.
+ */
+uint16_t adc_hw_read(void)
+{
+	#if CONFIG_KERN
+		/* Ensure ADC is not already in use by another process */
+		ASSERT(adc_process == NULL);
+		adc_process = proc_current();
+	#endif
+
+	/* Start convertion */
+    adc->CR2 |= CR2_EXTTRIG_SWSTRT_SET;
+
+	#if CONFIG_KERN
+		/* Ensure IRQs enabled. */
+		IRQ_ASSERT_ENABLED();
+		sig_wait(SIG_ADC_COMPLETE);
+
+		/* Prevent race condition in case of preemptive kernel */
+
+		MEMORY_BARRIER;
+		adc_process = NULL;
+		return ret;
+	#else
+		/* Wait in polling until conversion is done */
+		//while (!(adc->SR & BV(SR_EOC)));
+
+		/* Return the last converted data */
+		return 0;
+	#endif
+}
+
+/**
+ * Init ADC hardware.
+ */
+void adc_hw_init(void)
+{
+
+
+
+
+	#if CONFIG_KERN
+		adc_enable_irq();
+	#endif
+}
diff --git a/bertos/cpu/cortex-m3/drv/adc_lm3s.h b/bertos/cpu/cortex-m3/drv/adc_lm3s.h
new file mode 100644
index 00000000..ae677c54
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/adc_lm3s.h
@@ -0,0 +1,70 @@
+/**
+ * \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 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief ADC hardware-specific definition
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#ifndef DRV_ADC_LM3S_H
+#define DRV_ADC_LM3S_H
+
+#include "cfg/cfg_adc.h"
+
+#include <cfg/compiler.h>
+
+/**
+ * ADC config define.
+ */
+#define ADC_MUX_MAXCH         17 //Max number of channel for ADC.
+#define ADC_BITS              10 //Bit resolution for ADC converter.
+
+/**
+ * Define PIO controller for enable ADC function.
+ * \{
+ */
+
+/*\}*/
+
+/**
+ * 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_LM3S_H */
-- 
2.25.1