From c22f33b299c475e12d1525a82a24f724d0bd68aa Mon Sep 17 00:00:00 2001
From: marco <marco@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 20 Sep 2006 20:38:51 +0000
Subject: [PATCH] Added MCP41xxx digital potentiometer

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@723 38d2e660-2303-0410-9eaa-f027e97ec537
---
 drv/mcp41.c    | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 drv/mcp41.h    | 34 ++++++++++++++++++++++++++++++
 hw/hw_mcp41.c  | 30 ++++++++++++++++++++++++++
 hw/hw_mcp41.h  | 46 ++++++++++++++++++++++++++++++++++++++++
 hw/mcp41_map.h | 30 ++++++++++++++++++++++++++
 5 files changed, 197 insertions(+)
 create mode 100755 drv/mcp41.c
 create mode 100755 drv/mcp41.h
 create mode 100755 hw/hw_mcp41.c
 create mode 100755 hw/hw_mcp41.h
 create mode 100755 hw/mcp41_map.h

diff --git a/drv/mcp41.c b/drv/mcp41.c
new file mode 100755
index 00000000..b9bcf05b
--- /dev/null
+++ b/drv/mcp41.c
@@ -0,0 +1,57 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ *
+ * \version $Id$
+ *
+ * \brief MCP41xxx digital potentiomenter driver (implementation)
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include <drv/timer.h>
+
+#include <cfg/macros.h>
+#include <cfg/cpu.h>
+#include <cfg/compiler.h>
+
+#include <hw_mcp41.h>
+#include <drv/mcp41.h>
+#include <drv/ser.h>
+
+static Serial *spi_ser;
+
+/**
+ * Set resitance for digital pot \a dev
+ */
+void mcp41_setResistance(Mcp41Dev dev, mcp41_res_t res)
+{
+	MCP41_ON(dev);
+	/* send command byte */
+	ser_putchar(MCP41_WRITE_DATA, spi_ser);
+	ser_putchar(((MCP41_HW_MAX * (uint32_t)res)  + (MCP41_MAX / 2)) / MCP41_MAX, spi_ser);
+	ser_drain(spi_ser);
+
+	MCP41_OFF(dev);
+}
+
+
+/**
+ * Initialize mcp41 potentiometer driver
+ */
+void mcp41_init(Serial *spi_port)
+{
+	Mcp41Dev dev;
+
+	/* Init all potentiometer ports */
+	for (dev = 0; dev < MCP41_CNT; dev++)
+	{
+		SET_MCP41_DDR(dev);
+		MCP41_OFF(dev);
+	}
+
+	spi_ser = spi_port;
+}
diff --git a/drv/mcp41.h b/drv/mcp41.h
new file mode 100755
index 00000000..b5217b0e
--- /dev/null
+++ b/drv/mcp41.h
@@ -0,0 +1,34 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ *
+ * \version $Id$
+ *
+ * \brief MCP41xxx digital potentiomenter driver (interface)
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#ifndef DRV_MCP41_H
+#define DRV_MCP41_H
+
+#include <hw/mcp41_map.h>
+#include <cfg/compiler.h>
+#include <drv/ser.h>
+
+#define MCP41_WRITE_DATA 0x11
+#define MCP41_HW_MAX     255
+#define MCP41_MAX        999
+
+/**
+ * Type for digital potentiometer resistance.
+ */
+typedef uint16_t mcp41_res_t;
+
+void mcp41_setResistance(Mcp41Dev dev, mcp41_res_t res);
+void mcp41_init(Serial *spi_port);
+
+#endif /* DRV_MCP41_H */
diff --git a/hw/hw_mcp41.c b/hw/hw_mcp41.c
new file mode 100755
index 00000000..4455e2be
--- /dev/null
+++ b/hw/hw_mcp41.c
@@ -0,0 +1,30 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ *
+ * \version $Id$
+ *
+ * \brief MCP41 hardware-specific definitions
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include <hw_mcp41.h>
+
+#include <cfg/macros.h>
+#include <cfg/compiler.h>
+
+#include <avr/io.h>
+
+
+const uint16_t mcp41_ports[MCP41_CNT] = {
+                                        	_SFR_IO_ADDR(PORTB), /** Led pot */
+                                        	_SFR_IO_ADDR(PORTB), /** Photometer pot */
+					};
+const uint8_t  mcp41_pins [MCP41_CNT] = {
+                                        	BV(PB7),
+						BV(PB6),
+					};
diff --git a/hw/hw_mcp41.h b/hw/hw_mcp41.h
new file mode 100755
index 00000000..d2ef6900
--- /dev/null
+++ b/hw/hw_mcp41.h
@@ -0,0 +1,46 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ *
+ * \version $Id$
+ *
+ * \brief MCP41 hardware-specific definitions
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#ifndef HW_MCP41_H
+#define HW_MCP41_H
+
+#include <mcp41_map.h>
+#include <cfg/compiler.h>
+#include <cfg/cpu.h>
+#include <avr/io.h>
+
+extern const uint16_t mcp41_ports[MCP41_CNT];
+extern const uint8_t  mcp41_pins[MCP41_CNT];
+
+/**
+ * Set MCP41 port associated with \a dev to output.
+ */
+INLINE void SET_MCP41_DDR(Mcp41Dev dev)
+{
+	/* DDR port is 1 address before PORT */
+	ATOMIC(_SFR_IO8(mcp41_ports[dev] - 1) |= mcp41_pins[dev]);
+}
+
+INLINE void MCP41_ON(Mcp41Dev i)
+{
+	ATOMIC(_SFR_IO8(mcp41_ports[i]) &= ~mcp41_pins[i]);
+}
+
+INLINE void MCP41_OFF(Mcp41Dev i)
+{
+	ATOMIC(_SFR_IO8(mcp41_ports[i]) |= mcp41_pins[i]);
+}
+
+
+#endif /* HW_MCP41_H */
diff --git a/hw/mcp41_map.h b/hw/mcp41_map.h
new file mode 100755
index 00000000..a0170dee
--- /dev/null
+++ b/hw/mcp41_map.h
@@ -0,0 +1,30 @@
+/**
+ * \file
+ * <!--
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * All Rights Reserved.
+ * -->
+ *
+ * \brief MCP41 digital potentiometer map definitions.
+ *
+ * \version $Id$
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#ifndef MCP41_MAP_H
+#define MCP41_MAP_H
+
+/** \name Enum for mcp41 pot evices.
+ * \{
+ */
+typedef enum Mcp41Dev
+{
+	MCP41_LED,
+	MCP41_PHOTO_GAIN,
+
+	MCP41_CNT,
+} Mcp41Dev;
+/* \} */
+
+#endif /* MCP41_MAP_H */
-- 
2.25.1