* added base code for ADC. Not tested.

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/PeripheralNames.h

@@ -40,7 +40,7 @@ typedef enum {
     UART_4 = (int)0x42001800UL,  // Base address of SERCOM4
     UART_5 = (int)0x42001C00UL   // Base address of SERCOM5
 } UARTName;
-/*
+
 typedef enum {
     ADC0_0 = 0,
     ADC0_1,
@@ -49,9 +49,22 @@ typedef enum {
     ADC0_4,
     ADC0_5,
     ADC0_6,
-    ADC0_7
+    ADC0_7/*,
+	ADC0_8,
+	ADC0_9,
+	ADC0_10,
+	ADC0_11,
+	ADC0_12,
+	ADC0_13,
+	ADC0_14,
+	ADC0_15,
+	ADC0_16,
+	ADC0_17,
+	ADC0_18,
+	ADC0_19*/
 } ADCName;
 
+/*
 typedef enum {
     DAC_0 = 0
 } DACName;*/

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/PeripheralPins.h

@@ -26,7 +26,7 @@ uint32_t find_mux_setting (PinName output, PinName input, PinName clock, PinName
 //extern const PinMap PinMap_RTC[];
 
 /************ADC***************/
-//extern const PinMap PinMap_ADC[];
+extern const PinMap PinMap_ADC[];
 
 /************DAC***************/
 //extern const PinMap PinMap_DAC[];

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/TARGET_SAMR21G18A/PeripheralPins.c

@@ -34,6 +34,14 @@ const PinMap PinMap_RTC[] = {
 
 /************ADC***************/
 const PinMap PinMap_ADC[] = {
+    {PA04,  ADC0_0, 1},
+    {PA05,  ADC0_1, 1},
+    {PA06,  ADC0_2, 1},
+    {PA07,  ADC0_3, 1},
+    {PA08,  ADC0_4, 1},
+    {PA09,  ADC0_5, 1},
+    {PB02,  ADC0_6, 1},
+    {PB03,  ADC0_7, 1}
 };
 
 /************DAC***************/

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/TARGET_SAMR21G18A/device.h

@@ -22,7 +22,7 @@
 
 #define DEVICE_INTERRUPTIN      0
 
-#define DEVICE_ANALOGIN         0
+#define DEVICE_ANALOGIN         1
 #define DEVICE_ANALOGOUT        0
 
 #define DEVICE_SERIAL           1

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/analogin_api.c

@@ -0,0 +1,77 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "mbed_assert.h"
+#include "analogin_api.h"
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+#include "adc.h"
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+    struct adc_config config_adc;
+    uint32_t pos_input;
+
+    switch(pin) {
+        case PA04:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN4;
+            break;
+        case PA05:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN5;
+            break;
+        case PA06:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN6;
+            break;
+        case PA07:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN7;
+            break;
+        case PA08:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN16;
+            break;
+        case PA09:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN17;
+            break;
+        case PB02:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN10;
+            break;
+        case PB03:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN11;
+            break;
+        default:
+            pos_input = ADC_INPUTCTRL_MUXPOS_PIN4;  // MBED_ASSERT
+            break;
+
+    }
+    adc_get_config_defaults(&(obj->adc_instance));
+    config_adc.positive_input = pos_input;
+    adc_init(&(obj->adc_instance), ADC, &config_adc);
+    adc_enable(&(obj->adc_instance));
+}
+
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+    uint16_t result;
+    adc_start_conversion(&(obj->adc_instance));
+    adc_read(&(obj->adc_instance), &result);
+}
+
+float analogin_read(analogin_t *obj)
+{
+    uint16_t value = analogin_read_u16(obj);
+    return (float)value * (1.0f / (float)0xFFFF);
+}
+

libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/objects.h

@@ -20,6 +20,7 @@
 #include "PortNames.h"
 #include "PeripheralNames.h"
 #include "gpio_object.h"
+#include "adc.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -58,6 +59,11 @@ struct serial_s {
     uint32_t events;
 #endif
 };
+
+struct analogin_s {
+    ADCName adc;
+    struct adc_module adc_instance;
+};
 /*
 struct pwmout_s {
     __IO uint32_t *MR;
@@ -69,10 +75,6 @@ struct serial_s {
     int index;
 };
 
-struct analogin_s {
-    ADCName adc;
-};
-
 struct dac_s {
     DACName dac;
 };