1  // Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
 2  //
 3  // Licensed under the Apache License, Version 2.0 (the "License");
 4  // you may not use this file except in compliance with the License.
 5  // You may obtain a copy of the License at
 6  
 7  //     http://www.apache.org/licenses/LICENSE-2.0
 8  //
 9  // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  #include "esp32-hal-dac.h"
16  #include "freertos/FreeRTOS.h"
17  #include "freertos/task.h"
18  #include "rom/ets_sys.h"
19  #include "esp_attr.h"
20  #include "esp_intr.h"
21  #include "soc/rtc_io_reg.h"
22  #include "soc/rtc_cntl_reg.h"
23  #include "soc/sens_reg.h"
24  #include "esp32-hal-gpio.h"
25  
26  
27  void IRAM_ATTR __dacWrite(uint8_t pin, uint8_t value)
28  {
29      if(pin < 25 || pin > 26){
30          return;//not dac pin
31      }
32      pinMode(pin, ANALOG);
33      uint8_t channel = pin - 25;
34  
35  
36      //Disable Tone
37      CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_SW_TONE_EN);
38  
39      if (channel) {
40          //Disable Channel Tone
41          CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN2_M);
42          //Set the Dac value
43          SET_PERI_REG_BITS(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_DAC, value, RTC_IO_PDAC2_DAC_S);   //dac_output
44          //Channel output enable
45          SET_PERI_REG_MASK(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_XPD_DAC | RTC_IO_PDAC2_DAC_XPD_FORCE);
46      } else {
47          //Disable Channel Tone
48          CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN1_M);
49          //Set the Dac value
50          SET_PERI_REG_BITS(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_DAC, value, RTC_IO_PDAC1_DAC_S);   //dac_output
51          //Channel output enable
52          SET_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC | RTC_IO_PDAC1_DAC_XPD_FORCE);
53      }
54  }
55  
56  extern void dacWrite(uint8_t pin, uint8_t value) __attribute__ ((weak, alias("__dacWrite")));