cc2538: Add adc driver and example

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>

cpu/cc2538/dev/adc.h

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
+ * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \addtogroup cc2538
+ * @{
+ *
+ * \defgroup cc2538-adc cc2538 ADC
+ *
+ * Driver for the cc2538 ADC controller
+ * @{
+ *
+ * \file
+ * Header file for the cc2538 ADC driver
+ */
+#ifndef ADC_H_
+#define ADC_H_
+
+#include "contiki.h"
+#include "dev/soc-adc.h"
+
+#include <stdint.h>
+/*---------------------------------------------------------------------------*/
+/** \name ADC functions
+ * @{
+ */
+
+/** \brief Initializes the ADC controller */
+void adc_init(void);
+
+/** \brief Performs a single conversion on a given ADC channel
+ * \param channel The channel used for the conversion: \c SOC_ADC_ADCCON_CH_x
+ * \param ref The reference voltage used for the conversion: \c SOC_ADC_ADCCON_REF_x
+ * \param div The decimation rate used for the conversion: \c SOC_ADC_ADCCON_DIV_x
+ * \return Signed 16-bit conversion result: 2's complement, ENOBs in MSBs
+ * \note PD[5:4] are not usable when the temperature sensor is selected.
+ */
+int16_t adc_get(uint8_t channel, uint8_t ref, uint8_t div);
+
+/** @} */
+
+#endif /* ADC_H_ */
+
+/**
+ * @}
+ * @}
+ */