ulp_adc sample
Select one of the symbols to view example projects that use it.
 
Outline
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "esp_sleep.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/sens_reg.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "ulp.h"
#include "ulp_main.h"
#include "esp_adc/adc_oneshot.h"
#include "ulp/example_config.h"
#include "ulp_adc.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
app_main()
init_ulp_program()
start_ulp_program()
Files
loading...
SourceVuESP-IDF Framework and Examplesulp_adc samplemain/ulp_adc_example_main.c
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
/* * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 *//* ... */ /* ULP Example 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 <string.h> #include <inttypes.h> #include "esp_sleep.h" #include "soc/rtc_cntl_reg.h" #include "soc/sens_reg.h" #include "driver/gpio.h" #include "driver/rtc_io.h" #include "ulp.h" #include "ulp_main.h" #include "esp_adc/adc_oneshot.h" #include "ulp/example_config.h" #include "ulp_adc.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h"15 includes extern const uint8_t ulp_main_bin_start[] asm("_binary_ulp_main_bin_start"); extern const uint8_t ulp_main_bin_end[] asm("_binary_ulp_main_bin_end"); /* This function is called once after power-on reset, to load ULP program into * RTC memory and configure the ADC. *//* ... */ static void init_ulp_program(void); /* This function is called every time before going into deep sleep. * It starts the ULP program and resets measurement counter. *//* ... */ static void start_ulp_program(void); void app_main(void) { /* If user is using USB-serial-jtag then idf monitor needs some time to * re-connect to the USB port. We wait 1 sec here to allow for it to make the reconnection * before we print anything. Otherwise the chip will go back to sleep again before the user * has time to monitor any output. *//* ... */ vTaskDelay(pdMS_TO_TICKS(1000)); esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause(); if (cause != ESP_SLEEP_WAKEUP_ULP) { printf("Not ULP wakeup\n"); init_ulp_program(); }{...} else { printf("Deep sleep wakeup\n"); printf("ULP did %"PRIu32" measurements since last reset\n", ulp_sample_counter & UINT16_MAX); printf("Thresholds: low=%"PRIu32" high=%"PRIu32"\n", ulp_low_thr, ulp_high_thr); ulp_last_result &= UINT16_MAX; printf("Value=%"PRIu32" was %s threshold\n", ulp_last_result, ulp_last_result < ulp_low_thr ? "below" : "above"); }{...} printf("Entering deep sleep\n\n"); start_ulp_program(); ESP_ERROR_CHECK( esp_sleep_enable_ulp_wakeup() ); #if !CONFIG_IDF_TARGET_ESP32 /* RTC peripheral power domain needs to be kept on to keep SAR ADC related configs during sleep */ esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);/* ... */ #endif esp_deep_sleep_start(); }{ ... } static void init_ulp_program(void) { esp_err_t err = ulp_load_binary(0, ulp_main_bin_start, (ulp_main_bin_end - ulp_main_bin_start) / sizeof(uint32_t)); ESP_ERROR_CHECK(err); ulp_adc_cfg_t cfg = { .adc_n = EXAMPLE_ADC_UNIT, .channel = EXAMPLE_ADC_CHANNEL, .width = EXAMPLE_ADC_WIDTH, .atten = EXAMPLE_ADC_ATTEN, .ulp_mode = ADC_ULP_MODE_FSM, }{...}; ESP_ERROR_CHECK(ulp_adc_init(&cfg)); ulp_low_thr = EXAMPLE_ADC_LOW_TRESHOLD; ulp_high_thr = EXAMPLE_ADC_HIGH_TRESHOLD; /* Set ULP wake up period to 20ms */ ulp_set_wakeup_period(0, 20000); #if CONFIG_IDF_TARGET_ESP32 /* Disconnect GPIO12 and GPIO15 to remove current drain through * pullup/pulldown resistors on modules which have these (e.g. ESP32-WROVER) * GPIO12 may be pulled high to select flash voltage. *//* ... */ rtc_gpio_isolate(GPIO_NUM_12); rtc_gpio_isolate(GPIO_NUM_15);/* ... */ #endif // CONFIG_IDF_TARGET_ESP32 esp_deep_sleep_disable_rom_logging(); // suppress boot messages }{ ... } static void start_ulp_program(void) { /* Reset sample counter */ ulp_sample_counter = 0; /* Start the program */ esp_err_t err = ulp_run(&ulp_entry - RTC_SLOW_MEM); ESP_ERROR_CHECK(err); }{ ... }
Details
Show:
from
Types: Columns: