2016年12月15日 (四) 14:47的最后版本

[编辑] 1 Overview

Two DAC channel of ESP32:

• GPIO25 / RTC_GPIO6 / PIN_14
• GPIO26 / RTC_GPIO7 / PIN_15

[编辑] 2 Quick Start

In Linux:

[编辑] 2.1 Install ESP-IDF

$ sudo apt-get install git wget make libncurses-dev flex bison gperf python python-serial
$ wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux32-1.22.0-59.tar.gz
$ mkdir -p toolchain
$ tar zxf xtensa-esp32-elf-linux32-1.22.0-59.tar.gz -C toolchain
$ export PATH=$PATH:`pwd`/toolchain/xtensa-esp32-elf/bin
$
$ git clone --recursive git://github.com/icamgo/esp-idf.git
$ export IDF_PATH=`pwd`/esp-idf

[编辑] 2.2 Compile

$ cd esp-idf/examples/09_dac_out
$ make menuconfig
$ make flash -j2

[编辑] 2.3 Upload

$ make flash

You need to press the RST buttom after uploading the firmware into flash. If you guys do not like to do this please patch the /path/to/esp-idf/components/esptool_py/esptool/esptool.py :

diff --git a/esptool.py b/esptool.py
index 755f4cb..ff92c91 100755
--- a/esptool.py
+++ b/esptool.py
@@ -197,6 +197,12 @@ class ESPLoader(object):
               + '\xc0'
         self._port.write(buf)
 
+    def reset_to_app(self):
+        self._port.setDTR(False)
+        self._port.setRTS(True)
+        time.sleep(0.05)
+        self._port.setRTS(True)
+
     """ Calculate checksum of a blob, as it is defined by the ROM """
     @staticmethod
     def checksum(data, state=ESP_CHECKSUM_MAGIC):
@@ -1421,7 +1427,6 @@ def dump_mem(esp, args):
         sys.stdout.flush()
     print 'Done!'
 
-
 def write_flash(esp, args):
     """Write data to flash
     """
@@ -1503,6 +1508,7 @@ def write_flash(esp, args):
     if args.verify:
         print 'Verifying just-written flash...'
         verify_flash(esp, args, header_block)
+    esp.reset_to_app()
 
 
 def image_info(args):

Then Quantum can reset to run your app automatically after uploading the firmware into flash

[编辑] 2.4 Connections

Use a wire to connect from Quantum_I35 to Quantum_D5_GPIO25 / Quantum_D6_GPIO26

The serial will output the voltage of the Quantum_D5_GPIO25 (DAC Channel 1) / Quantum_D6_GPIO26 (DAC channel 2)

[编辑] 2.5 Output

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:QIO, clock div:1
load:0x3ffc0008,len:4
load:0x3ffc000c,len:1880
load:0x40078000,len:3408
ho 0 tail 12 room 4
load:0x40080000,len:260
entry 0x40080034
I (370) heap_alloc_caps: Initializing heap allocator:
I (370) heap_alloc_caps: Region 19: 3FFB4784 len 0002B87C tag 0
I (372) heap_alloc_caps: Region 25: 3FFE8000 len 00018000 tag 1
I (382) cpu_start: Pro cpu up.
I (387) cpu_start: Single core mode
I (394) cpu_start: Pro cpu start user code
I (599) phy: phy_version: 258, Nov 29 2016, 15:51:07, 0, 0
I (748) cpu_start: Starting scheduler on PRO CPU.
Welcome to Noduino Quantum
Try to output a voltage through GPIO25/26...
ESP32 ADC1_CH7 (IO35) = 229
ESP32 ADC1_CH7 (IO35) = 978
ESP32 ADC1_CH7 (IO35) = 1762
ESP32 ADC1_CH7 (IO35) = 2493
......
......

[编辑] 3 API

static esp_err_t dac_pad_get_io_num(dac_channel_t channel, gpio_num_t *gpio_num)
{
    RTC_MODULE_CHECK(channel < DAC_CHANNEL_MAX, "DAC Channel Err", ESP_ERR_INVALID_ARG);

    switch (channel) {
    case DAC_CHANNEL_1:
        *gpio_num = 25;
        break;
    case DAC_CHANNEL_2:
        *gpio_num = 26;
        break;
    default:
        return ESP_ERR_INVALID_ARG;
    }

    return ESP_OK;
}

static esp_err_t dac_rtc_pad_init(dac_channel_t channel)
{
    RTC_MODULE_CHECK(channel < DAC_CHANNEL_MAX, "DAC Channel Err", ESP_ERR_INVALID_ARG);
    gpio_num_t gpio_num = 0;
    dac_pad_get_io_num(channel, &gpio_num);
    rtc_gpio_init(gpio_num);
    rtc_gpio_output_disable(gpio_num);
    rtc_gpio_input_disable(gpio_num);
    rtc_gpio_pullup_dis(gpio_num);
    rtc_gpio_pulldown_dis(gpio_num);

    return ESP_OK;
}

static esp_err_t dac_out_enable(dac_channel_t channel)
{
    if (channel == DAC_CHANNEL_1) {
        portENTER_CRITICAL(&rtc_spinlock);
        SET_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC | RTC_IO_PDAC1_DAC_XPD_FORCE);
        portEXIT_CRITICAL(&rtc_spinlock);
    } else if (channel == DAC_CHANNEL_2) {
        portENTER_CRITICAL(&rtc_spinlock);
        SET_PERI_REG_MASK(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_XPD_DAC | RTC_IO_PDAC2_DAC_XPD_FORCE);
        portEXIT_CRITICAL(&rtc_spinlock);
    } else {
        return ESP_ERR_INVALID_ARG;
    }

    return ESP_OK;
}

esp_err_t dac_out_voltage(dac_channel_t channel, uint8_t dac_value)
{
    RTC_MODULE_CHECK(channel < DAC_CHANNEL_MAX, "DAC Channel Err", ESP_ERR_INVALID_ARG);
    portENTER_CRITICAL(&rtc_spinlock);
    //Disable Tone
    CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_SW_TONE_EN);

    //Disable Channel Tone
    if (channel == DAC_CHANNEL_1) {
        CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN1_M);
    } else if (channel == DAC_CHANNEL_2) {
        CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL2_REG, SENS_DAC_CW_EN2_M);
    }

    //Set the Dac value
    if (channel == DAC_CHANNEL_1) {
        SET_PERI_REG_BITS(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_DAC, dac_value, RTC_IO_PDAC1_DAC_S);   //dac_output
    } else if (channel == DAC_CHANNEL_2) {
        SET_PERI_REG_BITS(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_DAC, dac_value, RTC_IO_PDAC2_DAC_S);   //dac_output
    }

    portEXIT_CRITICAL(&rtc_spinlock);
    //dac pad init
    dac_rtc_pad_init(channel);
    dac_out_enable(channel);

    return ESP_OK;
}

[编辑] 4 Reference

For more information please refer to

• Noduino
• Noduino Quantum