Add first implementation of i2c for lm3s.

git-svn-id: https://src.develer.com/svnoss/bertos/branches/i2c@4013 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/cortex-m3/drv/i2c_lm3s.c b/bertos/cpu/cortex-m3/drv/i2c_lm3s.c
new file mode 100644 (file)
index 0000000..27fed7c
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/i2c_lm3s.c
@@ -0,0 +1,165 @@
+/**
+ * \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 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Driver for the LM3S I2C (implementation)
+ *
+ */
+
+#include "cfg/cfg_i2c.h"
+
+#define LOG_LEVEL  I2C_LOG_LEVEL
+#define LOG_FORMAT I2C_LOG_FORMAT
+
+#include <cfg/log.h>
+
+#include <cfg/debug.h>
+#include <cfg/macros.h> // BV()
+#include <cfg/module.h>
+
+#include <cpu/detect.h>
+#include <cpu/irq.h>
+#include <drv/timer.h>
+#include <drv/i2c.h>
+
+
+/**
+ * Send START condition on the bus.
+ *
+ * \return true on success, false otherwise.
+ */
+static bool i2c_builtin_start(void)
+{
+
+       return false;
+}
+
+
+/**
+ * Send START condition and select slave for write.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and reset to 0 for write operation.
+ *
+ * \return true on success, false otherwise.
+ */
+bool i2c_builtin_start_w(uint8_t id)
+{
+       /*
+        * Loop on the select write sequence: when the eeprom is busy
+        * writing previously sent data it will reply to the SLA_W
+        * control byte with a NACK.  In this case, we must
+        * keep trying until the eeprom responds with an ACK.
+        */
+       ticks_t start = timer_clock();
+       while (i2c_builtin_start())
+       {
+               else if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT))
+               {
+                       LOG_ERR("Timeout on TWI_MT_START\n");
+                       break;
+               }
+       }
+
+       return false;
+}
+
+
+/**
+ * Send START condition and select slave for read.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and set to 1 for read operation.
+ *
+ * \return true on success, false otherwise.
+ */
+bool i2c_builtin_start_r(uint8_t id)
+{
+       if (i2c_builtin_start())
+       {
+
+       }
+
+       return false;
+}
+
+
+/**
+ * Send STOP condition.
+ */
+void i2c_builtin_stop(void)
+{
+
+}
+
+
+/**
+ * Put a single byte in master transmitter mode
+ * to the selected slave device through the TWI bus.
+ *
+ * \return true on success, false on error.
+ */
+bool i2c_builtin_put(const uint8_t data)
+{
+       return true;
+}
+
+/**
+ * Get 1 byte from slave in master transmitter mode
+ * to the selected slave device through the I2C bus.
+ * If \a ack is true issue a ACK after getting the byte,
+ * otherwise a NACK is issued.
+ *
+ * \return the byte read if ok, EOF on errors.
+ */
+int i2c_builtin_get(bool ack)
+{
+
+       if (ack)
+       {
+
+       }
+       else
+       {
+
+       }
+
+       /* avoid sign extension */
+       return 0;
+}
+
+MOD_DEFINE(i2c);
+
+/**
+ * Initialize I2C module.
+ */
+void i2c_builtin_init(void)
+{
+       MOD_INIT(i2c);
+}