Add driver to read temperature from lm75 chip.

[bertos.git] / bertos / drv / lm75.c

diff --git a/bertos/drv/lm75.c b/bertos/drv/lm75.c
new file mode 100644 (file)
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--- /dev/null
+++ b/bertos/drv/lm75.c
@@ -0,0 +1,84 @@
+/**
+ * \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 LM75 sensor temperature family.
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include "lm75.h"
+
+#include "hw/hw_lm75.h"
+
+#include "cfg/cfg_lm75.h"
+
+#include <cfg/debug.h>
+
+// Define logging setting (for cfg/log.h module).
+#define LOG_LEVEL   LM75_LOG_LEVEL
+#define LOG_FORMAT  LM75_LOG_FORMAT
+
+#include <cfg/log.h>
+
+#include <drv/i2c.h>
+
+#define SELECT_ADDRESS(addr)   LM75_ADDRESS_BYTE | (addr << 1)
+
+deci_celsius_t lm75_read(addr_t sens_addr)
+{
+       uint8_t data[2];
+       int16_t degree;
+       int16_t deci_degree;
+
+       i2c_start_w(SELECT_ADDRESS(sens_addr));
+       i2c_put(LM75_PAD_BYTE);
+       i2c_start_r(SELECT_ADDRESS(sens_addr));
+       i2c_recv(&data, sizeof(data));
+
+       degree = (uint16_t)data[0];
+       deci_degree = (uint16_t)(((data[1] >> 7) & 1 ) * 5);
+
+       LOG_INFO("[%d.%d C]\n", degree, deci_degree);
+
+       return degree * 10 + deci_degree;
+}
+
+void lm75_init(void)
+{
+       i2c_init();
+       LOG_INFO("Init I2C module.\n");
+
+       LM75_HW_INIT();
+}
+
+