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bertos/drv/sipo.c

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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 2009 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ *
+ * \brief SIPO Module
+ *
+ * The SIPO module transforms a serial input in a parallel output. Please check hw_sipo.h
+ * file to customize hardware related parameters.
+ *
+ * \author Andrea Grandi <andrea@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#include "sipo.h"
+
+#include "hw/hw_sipo.h"
+
+#include <cfg/compiler.h>
+#include <cfg/log.h>
+
+#include <io/kfile.h>
+
+#include <string.h>
+
+
+#define SIPO_DATAORDER_START(order)          (order ? SIPO_DATAORDER_START_LSB : SIPO_DATAORDER_START_MSB)
+#define SIPO_DATAORDER_SHIFT(shift, order)   (order ?  ((shift) <<= 1) : ((shift) >>= 1))
+
+/**
+ * Write a char in sipo shift register
+ */
+INLINE void sipo_putchar(uint8_t c, uint8_t bit_order, uint8_t clock_pol)
+{
+	uint8_t shift = SIPO_DATAORDER_START(bit_order);
+
+	for(int i = 0; i < 8; i++)
+	{
+		if((c & shift) == 0)
+			SIPO_SI_LOW();
+		else
+			SIPO_SI_HIGH();
+
+		SIPO_SI_CLOCK(clock_pol);
+
+		SIPO_DATAORDER_SHIFT(shift, bit_order);
+	}
+}
+
+/**
+ * Write a buffer into the sipo register and, when finished, give a load pulse.
+ */
+static size_t sipo_write(struct KFile *_fd, const void *_buf, size_t size)
+{
+	const uint8_t *buf = (const uint8_t *)_buf;
+	Sipo *fd = SIPO_CAST(_fd);
+	size_t write_len = size;
+
+	ASSERT(buf);
+
+	SIPO_SET_SI_LEVEL();
+	SIPO_SET_CLK_LEVEL(fd->clock_pol);
+	SIPO_SET_LD_LEVEL(fd->load_device, fd->load_pol);
+
+	// Load into the shift register all the buffer bytes
+	while(size--)
+		sipo_putchar(*buf++, fd->bit_order, fd->clock_pol);
+
+	// We finsh to load bytes, so load it.
+	SIPO_LOAD(fd->load_device, fd->load_pol);
+
+	return write_len;
+}
+
+/**
+ * Initialize the SIPO
+ */
+void sipo_init(Sipo *fd)
+{
+	ASSERT(fd);
+
+	memset(fd, 0, sizeof(Sipo));
+
+	//Set kfile struct type as a generic kfile structure.
+	DB(fd->fd._type = KFT_SIPO);
+
+	// Set up SIPO writing functions.
+	fd->fd.write = sipo_write;
+
+	SIPO_INIT_PIN();
+
+	/* Enable sipo output */
+	SIPO_ENABLE();
+}