From 950d7eddec58ba6c9cd82dc129e206c89be16e81 Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Mon, 29 Oct 2007 14:48:14 +0000
Subject: [PATCH] Add emulator spi drive module.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@959 38d2e660-2303-0410-9eaa-f027e97ec537
---
 drv/spi_emu.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++
 drv/spi_emu.h |  72 ++++++++++++++++++++++++++++++
 2 files changed, 190 insertions(+)
 create mode 100644 drv/spi_emu.c
 create mode 100644 drv/spi_emu.h

diff --git a/drv/spi_emu.c b/drv/spi_emu.c
new file mode 100644
index 00000000..9d15ca19
--- /dev/null
+++ b/drv/spi_emu.c
@@ -0,0 +1,118 @@
+/**
+ * \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 2003, 2004, 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2000 Bernardo Innocenti <bernie@codewiz.org>
+ *
+ * -->
+ *
+ * \brief Emulated SPI Master for DSP firmware download (impl.)
+ *
+ * \version $Id: spi.c 15328 2007-03-21 15:07:04Z batt $
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+
+#include <cfg/cpu.h>
+#include <cfg/module.h>
+#include <drv/spi_emu.h>
+#include "hw_spi.h"
+
+void spi_assertSS(void)
+{
+	ATOMIC(SS_ACTIVE());
+}
+
+void spi_deassertSS(void)
+{
+	ATOMIC(SS_INACTIVE());
+}
+
+/**
+ * Send byte \c c over MOSI line, CONFIG_SPI_DATAORDER first.
+ * SS pin state is left unchanged.
+ */
+uint8_t spi_sendRecv(uint8_t c)
+{
+	uint8_t data = 0;
+	uint8_t shift = SPI_DATAORDER_START;
+
+
+	ATOMIC(
+		for (int i = 0; i < 8; i++)
+		{
+			/* Shift the i-th bit to MOSI */
+			if (c & shift)
+				MOSI_HIGH();
+			else
+				MOSI_LOW();
+			/* Assert clock */
+			SCK_ACTIVE();
+			data |= IS_MISO_HIGH() ? shift : 0;
+			/* De-assert clock */
+			SCK_INACTIVE();
+			SPI_DATAORDER_SHIFT(shift);
+		}
+	);
+	return data;
+}
+
+MOD_DEFINE(spi);
+void spi_init(void)
+{
+	ATOMIC(SPI_HW_INIT());
+	MOD_INIT(spi);
+}
+
+/**
+ * Read \param len from spi, and put it in \param buff.
+ */
+void spi_read(void *_buff, size_t len)
+{
+	uint8_t *buff = (uint8_t *)_buff;
+
+	while (len--)
+		/* Read byte from spi and put it in buffer. */
+		*buff++ = spi_sendRecv(0);
+
+}
+
+/**
+ * Write \param len to spi, and take it from \param buff.
+ */
+void spi_write(const void *_buff, size_t len)
+{
+	const uint8_t *buff = (const uint8_t *)_buff;
+
+	while (len--)
+		/* Write byte pointed at by *buff to spi */
+		spi_sendRecv(*buff++);
+
+}
diff --git a/drv/spi_emu.h b/drv/spi_emu.h
new file mode 100644
index 00000000..ff716906
--- /dev/null
+++ b/drv/spi_emu.h
@@ -0,0 +1,72 @@
+/**
+ * \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 2003, 2004, 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2000 Bernardo Innocenti <bernie@codewiz.org>
+ *
+ * -->
+ *
+ * \brief Emulated SPI Master for DSP firmware download (interface)
+ *
+ * \version $Id: spi.h 15321 2007-03-21 14:45:12Z asterix $
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+
+#ifndef DRV_SPI_EMU_H
+#define DRV_SPI_EMU_H
+
+#include <cfg/compiler.h>
+#include <appconfig.h>
+
+/**
+ * Define send and receive order bit.
+ * \{
+ */
+#define SPI_LSB_FIRST 1
+#define SPI_MSB_FIRST 2
+/* \} */
+
+#if CONFIG_SPI_DATAORDER == SPI_LSB_FIRST
+	#define  SPI_DATAORDER_START    1
+	#define  SPI_DATAORDER_SHIFT(i) ((i) <<= 1)
+#elif CONFIG_SPI_DATAORDER == SPI_MSB_FIRST
+	#define  SPI_DATAORDER_START    0x80
+	#define  SPI_DATAORDER_SHIFT(i) ((i) >>= 1)
+#endif
+
+void spi_write(const void *buf, size_t len);
+void spi_read(void *buf, size_t len);
+uint8_t spi_sendRecv(uint8_t c);
+void spi_init(void);
+void spi_assertSS(void);
+void spi_deassertSS(void);
+
+#endif /* DRV_SPI_EMU_H */
-- 
2.25.1