ESP32 Onchip Sensor
来自Jack's Lab
(版本间的差异)
(→Hacking) |
(→Study) |
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第180行: | 第180行: | ||
== Study == | == Study == | ||
+ | |||
+ | * The Hall Sensor uses Channel_0 and Channel_3 of ADC1. | ||
+ | * Set the width of ADC1 module to 12bit by calling adc1_config_width before calling hall_sensor_read. | ||
+ | * Please do not use Channel_0 and Channel_3 of ADC1 as ADC channels when you use the hall sensor. | ||
+ | |||
<source lang=cpp> | <source lang=cpp> |
2016年12月14日 (三) 20:55的版本
目录 |
1 Overview
The normal output:
ESP32 onchip Temperature = 143 ESP32 onchip Hall sensor = 5247
When you guys place a small magnetic block near the esp32 chip:
ESP32 onchip Temperature = 145 ESP32 onchip Hall sensor = 4988
Use the other pole near the chip:
ESP32 onchip Temperature = 147 ESP32 onchip Hall sensor = 5401
2 Hacked API
In librtc.a:
uint8_t temprature_sens_read(); uint32_t hall_sens_read();
3 Quick Start
- Build
$ 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 $ cd esp-idf/examples/09_onchip_sensor $ make menuconfig $ 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
- Check output
$ picocom -b 115200 /dev/ttyUSB0 ets Jun 8 2016 00:22:57 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:0x3ffc0000,len:0 load:0x3ffc0000,len:920 load:0x40078000,len:3220 ho 0 tail 12 room 4 load:0x40080000,len:260 entry 0x40080034 I (63) heap_alloc_caps: Initializing heap allocator: I (63) heap_alloc_caps: Region 19: 3FFB45D8 len 0002BA28 tag 0 I (65) heap_alloc_caps: Region 25: 3FFE8000 len 00018000 tag 1 I (74) cpu_start: Pro cpu up. I (80) cpu_start: Single core mode I (86) cpu_start: Pro cpu start user code rtc v118 Oct 19 2016 15:22:11 XTAL 40M I (121) cpu_start: Starting scheduler on PRO CPU. Welcome to Noduino Quantum Try to read the temperature sensor of the ESP32 onchip ... ESP32 onchip Temperature = 143 ESP32 onchip Hall sensor = 5247 ESP32 onchip Temperature = 145 ESP32 onchip Hall sensor = 5240
4 Code
/* * MaiKe Labs (2016 - 2026) * * Written by Jack Tan <jiankemeng@gmail.com> * * This example code is in the Public Domain (or CC0 licensed, at your option.) * Unless required by applicable law or agreed to in writing, this * software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR * CONDITIONS OF ANY KIND, either express or implied. * */ #include <stdio.h> #include <stdlib.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "esp_system.h" #include "nvs_flash.h" uint8_t temprature_sens_read(); uint32_t hall_sens_read(); void read_sens_task(void *pvParameters) { while (1) { printf("ESP32 onchip Temperature = %d\n", temprature_sens_read()); printf("ESP32 onchip Hall sensor = %d\n", hall_sens_read()); vTaskDelay(4000 / portTICK_PERIOD_MS); } } void app_main() { nvs_flash_init(); system_init(); printf("Welcome to Noduino Quantum\r\n"); printf("Try to read the sensors inside the ESP32 chip ... \r\n"); xTaskCreatePinnedToCore(&read_sens_task, "read_sens_task", 1024, NULL, 5, NULL, 0); }
5 Study
- The Hall Sensor uses Channel_0 and Channel_3 of ADC1.
- Set the width of ADC1 module to 12bit by calling adc1_config_width before calling hall_sensor_read.
- Please do not use Channel_0 and Channel_3 of ADC1 as ADC channels when you use the hall sensor.
static int hall_sensor_get_value() //hall sensor without LNA { int Sens_Vp0; int Sens_Vn0; int Sens_Vp1; int Sens_Vn1; int hall_value; portENTER_CRITICAL(&rtc_spinlock); // XPD HALL is controlled by SW SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_XPD_HALL_FORCE_M); // Power on hall sensor and connect to VP and VN SET_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_XPD_HALL); // HALL PHASE is controlled by SW SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_HALL_PHASE_FORCE_M); // normal phase of hall sensor CLEAR_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_HALL_PHASE); Sens_Vp0 = adc1_get_voltage(ADC1_CHANNEL_0); Sens_Vn0 = adc1_get_voltage(ADC1_CHANNEL_3); // Reverse phase of hall sensor SET_PERI_REG_MASK(RTC_IO_HALL_SENS_REG, RTC_IO_HALL_PHASE); Sens_Vp1 = adc1_get_voltage(ADC1_CHANNEL_0); Sens_Vn1 = adc1_get_voltage(ADC1_CHANNEL_3); // SENS_SAR_MEAS_WAIT2_REG, SENS_FORCE_XPD_SAR SET_PERI_REG_BITS(SENS_SAR_MEAS_WAIT2_REG, SENS_FORCE_XPD_SAR, 0, SENS_FORCE_XPD_SAR_S); CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_XPD_HALL_FORCE); CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_HALL_PHASE_FORCE); portEXIT_CRITICAL(&rtc_spinlock); hall_value = (Sens_Vp1 - Sens_Vp0) - (Sens_Vn1 - Sens_Vn0); return hall_value; } int hall_sensor_read() { adc1_pad_init(ADC1_CHANNEL_0); adc1_pad_init(ADC1_CHANNEL_3); adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_0db); adc1_config_channel_atten(ADC1_CHANNEL_3, ADC_ATTEN_0db); return hall_sensor_get_value(); }
6 Reference
- For more information please refer to