Merge pull request #411 from ADVANSEE/cc2538-adc

cc2538: Add adc driver and example

cpu/cc2538/Makefile.cc2538

@@ -46,7 +46,7 @@ CONTIKI_CPU_DIRS += ../cc253x/usb/common ../cc253x/usb/common/cdc-acm
 
 ### CPU-dependent source files
 CONTIKI_CPU_SOURCEFILES += clock.c rtimer-arch.c uart.c watchdog.c
-CONTIKI_CPU_SOURCEFILES += nvic.c cpu.c sys-ctrl.c gpio.c ioc.c spi.c
+CONTIKI_CPU_SOURCEFILES += nvic.c cpu.c sys-ctrl.c gpio.c ioc.c spi.c adc.c
 CONTIKI_CPU_SOURCEFILES += cc2538-rf.c udma.c lpm.c
 CONTIKI_CPU_SOURCEFILES += dbg.c ieee-addr.c
 CONTIKI_CPU_SOURCEFILES += slip-arch.c slip.c

cpu/cc2538/dev/adc.c

@@ -0,0 +1,99 @@
+/*
+ * 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-adc
+ * @{
+ *
+ * \file
+ * Implementation of the cc2538 ADC driver
+ */
+#include "contiki.h"
+#include "dev/soc-adc.h"
+#include "dev/cctest.h"
+#include "dev/rfcore-xreg.h"
+#include "dev/adc.h"
+#include "reg.h"
+
+#include <stdint.h>
+
+/*---------------------------------------------------------------------------*/
+void
+adc_init(void)
+{
+  /* Start conversions only manually */
+  REG(SOC_ADC_ADCCON1) |= SOC_ADC_ADCCON1_STSEL;
+}
+/*---------------------------------------------------------------------------*/
+int16_t
+adc_get(uint8_t channel, uint8_t ref, uint8_t div)
+{
+  uint32_t cctest_tr0, rfcore_xreg_atest;
+  int16_t res;
+
+  /* On-chip temperature sensor */
+  if(channel == SOC_ADC_ADCCON_CH_TEMP) {
+    /* Connect the temperature sensor to the ADC */
+    cctest_tr0 = REG(CCTEST_TR0);
+    REG(CCTEST_TR0) = cctest_tr0 | CCTEST_TR0_ADCTM;
+
+    /* Enable the temperature sensor */
+    rfcore_xreg_atest = REG(RFCORE_XREG_ATEST);
+    REG(RFCORE_XREG_ATEST) = (rfcore_xreg_atest & ~RFCORE_XREG_ATEST_ATEST_CTRL) |
+                             RFCORE_XREG_ATEST_ATEST_CTRL_TEMP;
+  }
+
+  /* Start a single extra conversion with the given parameters */
+  REG(SOC_ADC_ADCCON3) = (REG(SOC_ADC_ADCCON3) &
+                          ~(SOC_ADC_ADCCON3_EREF | SOC_ADC_ADCCON3_EDIV | SOC_ADC_ADCCON3_ECH)) |
+                         ref | div | channel;
+
+  /* Poll until end of conversion */
+  while(!(REG(SOC_ADC_ADCCON1) & SOC_ADC_ADCCON1_EOC));
+
+  /* Read conversion result, reading SOC_ADC_ADCH last to clear
+   * SOC_ADC_ADCCON1.EOC */
+  res  = REG(SOC_ADC_ADCL) & 0xfc;
+  res |= REG(SOC_ADC_ADCH) << 8;
+
+  /* On-chip temperature sensor */
+  if(channel == SOC_ADC_ADCCON_CH_TEMP) {
+    /* Restore the initial temperature sensor state and connection (better for
+     * power consumption) */
+    REG(RFCORE_XREG_ATEST) = rfcore_xreg_atest;
+    REG(CCTEST_TR0) = cctest_tr0;
+  }
+
+  /* Return conversion result */
+  return res;
+}
+
+/** @} */

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_ */
+
+/**
+ * @}
+ * @}
+ */

cpu/cc2538/dev/cctest.h

@@ -0,0 +1,92 @@
+/*
+ * Original file:
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
+ * All rights reserved.
+ *
+ * Port to Contiki:
+ * 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-rfcore
+ * @{
+ *
+ * \file
+ * Header with declarations of CCTEST module registers.
+ */
+#ifndef CCTEST_H
+#define CCTEST_H
+
+/*---------------------------------------------------------------------------*/
+/**
+ * \name CCTEST register offsets
+ * @{
+ */
+#define CCTEST_IO               0x44010000 /**< Output strength control */
+#define CCTEST_OBSSEL0          0x44010014 /**< Observation output 0 */
+#define CCTEST_OBSSEL1          0x44010018 /**< Observation output 1 */
+#define CCTEST_OBSSEL2          0x4401001C /**< Observation output 2 */
+#define CCTEST_OBSSEL3          0x44010020 /**< Observation output 3 */
+#define CCTEST_OBSSEL4          0x44010024 /**< Observation output 4 */
+#define CCTEST_OBSSEL5          0x44010028 /**< Observation output 5 */
+#define CCTEST_OBSSEL6          0x4401002C /**< Observation output 6 */
+#define CCTEST_OBSSEL7          0x44010030 /**< Observation output 7 */
+#define CCTEST_TR0              0x44010034 /**< Test register 0 */
+#define CCTEST_USBCTRL          0x44010050 /**< USB PHY stand-by control */
+/** @} */
+/*---------------------------------------------------------------------------*/
+/** \name CCTEST_IO register bit fields
+ * @{
+ */
+#define CCTEST_IO_SC            0x00000001 /**< I/O strength control */
+/** @} */
+/*---------------------------------------------------------------------------*/
+/** \name CCTEST_OBSSELx registers bit fields
+ * @{
+ */
+#define CCTEST_OBSSEL_EN        0x00000080 /**< Observation output enable */
+#define CCTEST_OBSSEL_SEL_M     0x0000007F /**< n - obs_sigs[n] output selection mask */
+#define CCTEST_OBSSEL_SEL_S     0          /**< n - obs_sigs[n] output selection shift */
+/** @} */
+/*---------------------------------------------------------------------------*/
+/** \name CCTEST_TR0 register bit fields
+ * @{
+ */
+#define CCTEST_TR0_ADCTM        0x00000002 /**< Connect temperature sensor to ADC */
+/** @} */
+/*---------------------------------------------------------------------------*/
+/** \name CCTEST_USBCTRL register bit fields
+ * @{
+ */
+#define CCTEST_USBCTRL_USB_STB  0x00000001 /**< USB PHY stand-by override */
+/** @} */
+
+#endif /* CCTEST_H */
+/** @} */

cpu/cc2538/dev/rfcore-xreg.h

@@ -575,6 +575,8 @@
  * @{
  */
 #define RFCORE_XREG_ATEST_ATEST_CTRL 0x0000003F /**< Controls the analog test mode */
+#define RFCORE_XREG_ATEST_ATEST_CTRL_DIS 0x00000000 /**< Analog test mode: disabled */
+#define RFCORE_XREG_ATEST_ATEST_CTRL_TEMP 0x00000001 /**< Analog test mode: enable temperature sensor */
 /** @} */
 /*---------------------------------------------------------------------------*/
 /** \name RFCORE_XREG_PTEST0 register bit masks

cpu/cc2538/dev/soc-adc.h

@@ -83,6 +83,34 @@
 #define SOC_ADC_ADCCON3_ECH     0x0000000F /**< Single channel select */
 /** @} */
 /*---------------------------------------------------------------------------*/
+/** \name SOC_ADC_ADCCONx registers field values
+ * @{
+ */
+#define SOC_ADC_ADCCON_REF_INT          (0 << 6) /**< Internal reference */
+#define SOC_ADC_ADCCON_REF_EXT_SINGLE   (1 << 6) /**< External reference on AIN7 pin */
+#define SOC_ADC_ADCCON_REF_AVDD5        (2 << 6) /**< AVDD5 pin */
+#define SOC_ADC_ADCCON_REF_EXT_DIFF     (3 << 6) /**< External reference on AIN6-AIN7 differential input */
+#define SOC_ADC_ADCCON_DIV_64           (0 << 4) /**< 64 decimation rate (7 bits ENOB) */
+#define SOC_ADC_ADCCON_DIV_128          (1 << 4) /**< 128 decimation rate (9 bits ENOB) */
+#define SOC_ADC_ADCCON_DIV_256          (2 << 4) /**< 256 decimation rate (10 bits ENOB) */
+#define SOC_ADC_ADCCON_DIV_512          (3 << 4) /**< 512 decimation rate (12 bits ENOB) */
+#define SOC_ADC_ADCCON_CH_AIN0          0x0 /**< AIN0 */
+#define SOC_ADC_ADCCON_CH_AIN1          0x1 /**< AIN1 */
+#define SOC_ADC_ADCCON_CH_AIN2          0x2 /**< AIN2 */
+#define SOC_ADC_ADCCON_CH_AIN3          0x3 /**< AIN3 */
+#define SOC_ADC_ADCCON_CH_AIN4          0x4 /**< AIN4 */
+#define SOC_ADC_ADCCON_CH_AIN5          0x5 /**< AIN5 */
+#define SOC_ADC_ADCCON_CH_AIN6          0x6 /**< AIN6 */
+#define SOC_ADC_ADCCON_CH_AIN7          0x7 /**< AIN7 */
+#define SOC_ADC_ADCCON_CH_AIN0_AIN1     0x8 /**< AIN0-AIN1 */
+#define SOC_ADC_ADCCON_CH_AIN2_AIN3     0x9 /**< AIN2-AIN3 */
+#define SOC_ADC_ADCCON_CH_AIN4_AIN5     0xA /**< AIN4-AIN5 */
+#define SOC_ADC_ADCCON_CH_AIN6_AIN7     0xB /**< AIN6-AIN7 */
+#define SOC_ADC_ADCCON_CH_GND           0xC /**< GND */
+#define SOC_ADC_ADCCON_CH_TEMP          0xE /**< Temperature sensor */
+#define SOC_ADC_ADCCON_CH_VDD_3         0xF /**< VDD/3 */
+/** @} */
+/*---------------------------------------------------------------------------*/
 /** \name SOC_ADC_ADC[L:H] register bit masks
  * @{
  */

examples/cc2538dk/cc2538-demo.c

@@ -50,6 +50,8 @@
  *                - BTN_DOWN turns on LEDS_REBOOT and causes a watchdog reboot
  *                - BTN_UP to soft reset (SYS_CTRL_PWRDBG::FORCE_WARM_RESET)
  *                - BTN_LEFT and BTN_RIGHT flash the LED defined as LEDS_BUTTON
+ * - ADC sensors  : On-chip VDD / 3 and temperature, and ambient light sensor
+ *                  values are printed over UART periodically.
  * - UART         : Every LOOP_INTERVAL the EM will print something over the
  *                  UART. Receiving an entire line of text over UART (ending
  *                  in \\r) will cause LEDS_SERIAL_IN to toggle
@@ -68,6 +70,7 @@
 #include "dev/leds.h"
 #include "dev/uart.h"
 #include "dev/button-sensor.h"
+#include "dev/adc-sensor.h"
 #include "dev/watchdog.h"
 #include "dev/serial-line.h"
 #include "dev/sys-ctrl.h"
@@ -111,6 +114,7 @@ rt_callback(struct rtimer *t, void *ptr)
 /*---------------------------------------------------------------------------*/
 PROCESS_THREAD(cc2538_demo_process, ev, data)
 {
+  int16_t value;
 
   PROCESS_EXITHANDLER(broadcast_close(&bc))
 
@@ -127,7 +131,18 @@ PROCESS_THREAD(cc2538_demo_process, ev, data)
 
     if(ev == PROCESS_EVENT_TIMER) {
       leds_on(LEDS_PERIODIC);
-      printf("Counter = 0x%08x\n", counter);
+      printf("-----------------------------------------\n"
+             "Counter = 0x%08x\n", counter);
+
+      value = adc_sensor.value(ADC_SENSOR_VDD_3);
+      printf("VDD = %d mV\n", value * (3 * 1190) / (2047 << 4));
+
+      value = adc_sensor.value(ADC_SENSOR_TEMP);
+      printf("Temperature = %d mC\n",
+             25000 + ((value >> 4) - 1422) * 10000 / 42);
+
+      value = adc_sensor.value(ADC_SENSOR_ALS);
+      printf("Ambient light sensor = %d raw\n", value);
 
       etimer_set(&et, CLOCK_SECOND);
       rtimer_set(&rt, RTIMER_NOW() + LEDS_OFF_HYSTERISIS, 1,

platform/cc2538dk/Makefile.cc2538dk

@@ -8,7 +8,8 @@ CONTIKI_TARGET_DIRS = . dev
 
 CONTIKI_TARGET_SOURCEFILES += leds.c leds-arch.c
 CONTIKI_TARGET_SOURCEFILES += contiki-main.c
-CONTIKI_TARGET_SOURCEFILES += sensors.c smartrf-sensors.c button-sensor.c
+CONTIKI_TARGET_SOURCEFILES += sensors.c smartrf-sensors.c
+CONTIKI_TARGET_SOURCEFILES += button-sensor.c adc-sensor.c
 
 TARGET_START_SOURCEFILES += startup-gcc.c
 TARGET_STARTFILES = ${addprefix $(OBJECTDIR)/,${call oname, $(TARGET_START_SOURCEFILES)}}

platform/cc2538dk/README.md

@@ -28,9 +28,11 @@ In terms of hardware support, the following drivers have been implemented:
     * Random number generator
     * Low Power Modes
     * General-Purpose Timers. NB: GPT0 is in use by the platform code, the remaining GPTs are available for application development.
+    * ADC
   * SmartRF06 EB and BB peripherals
     * LEDs
     * Buttons
+    * ADC sensors (on-chip VDD / 3 and temperature, ambient light sensor)
     * UART connectivity over the XDS100v3 backchannel (EB only)
 
 Requirements

platform/cc2538dk/dev/adc-sensor.c

@@ -0,0 +1,111 @@
+/*
+ * 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 cc2538dk-adc-sensor
+ * @{
+ *
+ * \file
+ *  Driver for the SmartRF06EB ADC
+ */
+#include "contiki.h"
+#include "sys/clock.h"
+#include "dev/ioc.h"
+#include "dev/gpio.h"
+#include "dev/adc.h"
+#include "dev/adc-sensor.h"
+
+#include <stdint.h>
+
+#define ADC_ALS_PWR_PORT_BASE    GPIO_PORT_TO_BASE(ADC_ALS_PWR_PORT)
+#define ADC_ALS_PWR_PIN_MASK     GPIO_PIN_MASK(ADC_ALS_PWR_PIN)
+#define ADC_ALS_OUT_PIN_MASK     GPIO_PIN_MASK(ADC_ALS_OUT_PIN)
+/*---------------------------------------------------------------------------*/
+static int
+value(int type)
+{
+  uint8_t channel;
+  int16_t res;
+
+  switch(type) {
+  case ADC_SENSOR_VDD_3:
+    channel = SOC_ADC_ADCCON_CH_VDD_3;
+    break;
+  case ADC_SENSOR_TEMP:
+    channel = SOC_ADC_ADCCON_CH_TEMP;
+    break;
+  case ADC_SENSOR_ALS:
+    channel = SOC_ADC_ADCCON_CH_AIN0 + ADC_ALS_OUT_PIN;
+    GPIO_SET_PIN(ADC_ALS_PWR_PORT_BASE, ADC_ALS_PWR_PIN_MASK);
+    clock_delay_usec(2000);
+    break;
+  default:
+    return 0;
+  }
+
+  res = adc_get(channel, SOC_ADC_ADCCON_REF_INT, SOC_ADC_ADCCON_DIV_512);
+
+  if(type == ADC_SENSOR_ALS) {
+    GPIO_CLR_PIN(ADC_ALS_PWR_PORT_BASE, ADC_ALS_PWR_PIN_MASK);
+  }
+
+  return res;
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, int value)
+{
+  switch(type) {
+  case SENSORS_HW_INIT:
+    GPIO_SOFTWARE_CONTROL(ADC_ALS_PWR_PORT_BASE, ADC_ALS_PWR_PIN_MASK);
+    GPIO_SET_OUTPUT(ADC_ALS_PWR_PORT_BASE, ADC_ALS_PWR_PIN_MASK);
+    GPIO_CLR_PIN(ADC_ALS_PWR_PORT_BASE, ADC_ALS_PWR_PIN_MASK);
+    ioc_set_over(ADC_ALS_PWR_PORT, ADC_ALS_PWR_PIN, IOC_OVERRIDE_DIS);
+
+    GPIO_SOFTWARE_CONTROL(GPIO_A_BASE, ADC_ALS_OUT_PIN_MASK);
+    GPIO_SET_INPUT(GPIO_A_BASE, ADC_ALS_OUT_PIN_MASK);
+    ioc_set_over(GPIO_A_NUM, ADC_ALS_OUT_PIN, IOC_OVERRIDE_ANA);
+
+    adc_init();
+    break;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+status(int type)
+{
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(adc_sensor, ADC_SENSOR, value, configure, status);
+
+/** @} */

platform/cc2538dk/dev/adc-sensor.h

@@ -0,0 +1,67 @@
+/*
+ * 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-smartrf-sensors
+ * @{
+ *
+ * \defgroup cc2538dk-adc-sensor cc2538dk ADC Driver
+ *
+ * Driver for the SmartRF06EB ADC sensors
+ * @{
+ *
+ * \file
+ * Header file for the cc2538dk ADC Driver
+ */
+#ifndef ADC_SENSOR_H_
+#define ADC_SENSOR_H_
+
+#include "lib/sensors.h"
+
+/*---------------------------------------------------------------------------*/
+/** \name ADC sensors
+ * @{
+ */
+#define ADC_SENSOR "ADC"
+
+#define ADC_SENSOR_VDD_3        0 /**< On-chip VDD / 3 */
+#define ADC_SENSOR_TEMP         1 /**< On-chip temperature */
+#define ADC_SENSOR_ALS          2 /**< Ambient light sensor */
+/** @} */
+
+extern const struct sensors_sensor adc_sensor;
+
+#endif /* ADC_SENSOR_H_ */
+
+/**
+ * @}
+ * @}
+ */

platform/cc2538dk/dev/board.h

@@ -167,6 +167,20 @@
 #define PLATFORM_HAS_BUTTON      1
 /** @} */
 /*---------------------------------------------------------------------------*/
+/**
+ * \name ADC configuration
+ *
+ * These values configure which CC2538 pins and ADC channels to use for the ADC
+ * inputs.
+ *
+ * ADC inputs can only be on port A.
+ * @{
+ */
+#define ADC_ALS_PWR_PORT         GPIO_A_NUM /**< ALS power GPIO control port */
+#define ADC_ALS_PWR_PIN          7 /**< ALS power GPIO control pin */
+#define ADC_ALS_OUT_PIN          6 /**< ALS output ADC input pin on port A */
+/** @} */
+/*---------------------------------------------------------------------------*/
 /**
  * \name SPI configuration
  *

platform/cc2538dk/dev/smartrf-sensors.c

@@ -42,12 +42,13 @@
  */
 #include "contiki.h"
 #include "dev/button-sensor.h"
+#include "dev/adc-sensor.h"
 
 #include <string.h>
 
 /** \brief Exports a global symbol to be used by the sensor API */
 SENSORS(&button_select_sensor, &button_left_sensor, &button_right_sensor,
-        &button_up_sensor, &button_down_sensor);
+        &button_up_sensor, &button_down_sensor, &adc_sensor);
 
 /**
  * @}