Add analogRead, touchRead, dacWrite and updated esp-idf

tools/sdk/include/driver/driver/dac.h

@@ -0,0 +1,57 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#ifndef _DRIVER_DAC_H_
+#define _DRIVER_DAC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include "esp_err.h"
+
+typedef enum {
+    DAC_CHANNEL_1 = 1,  /*!< DAC channel 1 is GPIO25 */
+    DAC_CHANNEL_2,      /*!< DAC channel 2 is GPIO26 */
+    DAC_CHANNEL_MAX,
+} dac_channel_t;
+
+/**
+ * @brief Set Dac output voltage.
+ *
+ * Dac width is 8bit ,and the voltage max is vdd
+ *
+ * @param channel dac channel
+ * @param dac_value dac output value
+ *
+ * @return
+ *     - ESP_OK success
+ *     - ESP_ERR_INVALID_ARG Parameter error
+ */
+esp_err_t dac_out_voltage(dac_channel_t channel, uint8_t dac_value);
+
+/**
+ *----------EXAMPLE TO USE DAC------------ *
+ * @code{c}
+ * dac_out_voltage(DAC_CHANNEL_1,200);//the dac out voltage ≈ 200*vdd/255
+ * @endcode
+ **/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /*_DRIVER_DAC_H_*/
+