Add analogRead, touchRead, dacWrite and updated esp-idf

cores/esp32/esp32-hal-dac.c

@@ -0,0 +1,54 @@
+// 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.
+
+#include "esp32-hal-dac.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "rom/ets_sys.h"
+#include "esp_attr.h"
+#include "esp_intr.h"
+#include "soc/rtc_io_reg.h"
+#include "soc/rtc_cntl_reg.h"
+#include "soc/sens_reg.h"
+
+void IRAM_ATTR __dacWrite(uint8_t pin, uint8_t value)
+{
+    if(pin < 25 || pin > 26){
+        return;//not dac pin
+    }
+    pinMode(pin, ANALOG);
+    uint8_t channel = pin - 25;
+
+
+    //Disable Tone
+    CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_SW_TONE_EN);
+
+    if (channel) {
+        //Disable Channel Tone
+        CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN2_M);
+        //Set the Dac value
+        SET_PERI_REG_BITS(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_DAC, value, RTC_IO_PDAC2_DAC_S);   //dac_output
+        //Channel output enable
+        SET_PERI_REG_MASK(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_XPD_DAC | RTC_IO_PDAC2_DAC_XPD_FORCE);
+    } else {
+        //Disable Channel Tone
+        CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN1_M);
+        //Set the Dac value
+        SET_PERI_REG_BITS(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_DAC, value, RTC_IO_PDAC1_DAC_S);   //dac_output
+        //Channel output enable
+        SET_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC | RTC_IO_PDAC1_DAC_XPD_FORCE);
+    }
+}
+
+extern void dacWrite(uint8_t pin, uint8_t value) __attribute__ ((weak, alias("__dacWrite")));