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bertos/drv/ft245rl.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 2007 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Function library for Accessing FT245RL USB interface.
+ *
+ * This module handles USB communication with FT245RL chip.
+ * This chip is a parallel USB interface with data flow control.
+ * A kfile-like interface is supplied.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include "hw/hw_ft245rl.h"
+#include "ft245rl.h"
+
+#include <cfg/macros.h>
+#include <cfg/debug.h>
+#include <cfg/module.h>
+
+#include <drv/timer.h>
+
+#include <io/kfile.h>
+
+#include <string.h>
+
+
+MOD_DEFINE(ft245rl);
+
+/**
+ * Read \a size bytes in buffer \a buf, from fid \a _fd.
+ */
+static size_t ft245rl_read(struct KFile *_fd, void *_buf, size_t size)
+{
+	Ft245rl *fd = FT245RL_CAST(_fd);
+	(void)fd; //unused
+	uint8_t *buf = (uint8_t *)_buf;
+	size_t total_read = 0;
+
+	while (size--)
+	{
+		while(!FT245RL_DATA_RDY())
+			/* busy waiy */;
+
+		*buf++ = FT245RL_GETDATA();
+		total_read++;
+	}
+
+	return total_read;
+}
+
+/**
+ * Write \a size bytes from buffer \a buf, of fid \a _fd.
+ */
+static size_t ft245rl_write(struct KFile *_fd, const void *_buf, size_t size)
+{
+	Ft245rl *fd = FT245RL_CAST(_fd);
+	(void)fd; //unused
+	const uint8_t *buf = (const uint8_t *)_buf;
+	size_t total_write = 0;
+
+	while (size--)
+	{
+		while(!FT245RL_TX_ALLOWED())
+			/* busy waiy */;
+
+		FT245RL_SETDATA(*buf++);
+		total_write++;
+	}
+
+	return total_write;
+}
+
+/**
+ * Ft245rl init function.
+ */
+void ft245rl_init(Ft245rl *fd)
+{
+	memset(fd, 0, sizeof(*fd));
+	DB(fd->fd._type = KFT_FT245RL);
+
+	// Setup data ft245rl communication functions.
+	fd->fd.read = ft245rl_read;
+	fd->fd.write = ft245rl_write;
+
+	FT245RL_INIT();
+	while (FT245RL_DATA_RDY())
+		FT245RL_GETDATA();
+
+	MOD_INIT(ft245rl);
+}