Refactor BeRTOS to be in his own directory.

[bertos.git] / bertos / drv / mcp41.c

diff --git a/bertos/drv/mcp41.c b/bertos/drv/mcp41.c
new file mode 100644 (file)
index 0000000..12c566f
--- /dev/null
+++ b/bertos/drv/mcp41.c
@@ -0,0 +1,81 @@
+/**
+ * \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 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/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;
+}