Merged from external project:

[bertos.git] / bertos / drv / i2c.c

diff --git a/bertos/drv/i2c.c b/bertos/drv/i2c.c
new file mode 100644 (file)
index 0000000..c936837
--- /dev/null
+++ b/bertos/drv/i2c.c
@@ -0,0 +1,91 @@
+/**
+ * \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/)
+ *
+ * -->
+ *
+ * \brief I2C generic driver functions (implementation).
+ *
+ * \version $Id$
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include "i2c.h"
+
+/**
+ * Send a sequence of bytes in master transmitter mode
+ * to the selected slave device through the I2C bus.
+ *
+ * \return true on success, false on error.
+ */
+bool i2c_send(const void *_buf, size_t count)
+{
+       const uint8_t *buf = (const uint8_t *)_buf;
+
+       while (count--)
+       {
+               if (!i2c_put(*buf++))
+                       return false;
+       }
+       return true;
+}
+
+/**
+ * Receive a sequence of one or more bytes from the
+ * selected slave device in master receive mode through
+ * the I2C bus.
+ *
+ * Received data is placed in \c buf.
+ *
+ * \note a NACK is automatically given on the last received
+ *         byte.
+ *
+ * \return true on success, false on error
+ */
+bool i2c_recv(void *_buf, size_t count)
+{
+       uint8_t *buf = (uint8_t *)_buf;
+
+       while (count--)
+       {
+               /*
+                * The last byte read does not has an ACK
+                * to stop communication.
+                */
+               int c = i2c_get(count);
+
+               if (c == EOF)
+                       return false;
+               else
+                       *buf++ = c;
+       }
+
+       return true;
+}
+