valeros
109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/* ULP Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "esp_sleep.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/sens_reg.h"
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#include "driver/gpio.h"
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#include "driver/rtc_io.h"
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#include "ulp.h"
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#include "ulp_main.h"
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#include "esp_adc/adc_oneshot.h"
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#include "ulp/example_config.h"
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#include "ulp_adc.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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extern const uint8_t ulp_main_bin_start[] asm("_binary_ulp_main_bin_start");
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extern const uint8_t ulp_main_bin_end[] asm("_binary_ulp_main_bin_end");
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/* This function is called once after power-on reset, to load ULP program into
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* RTC memory and configure the ADC.
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*/
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static void init_ulp_program(void);
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/* This function is called every time before going into deep sleep.
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* It starts the ULP program and resets measurement counter.
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*/
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static void start_ulp_program(void);
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void app_main(void)
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{
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esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
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if (cause != ESP_SLEEP_WAKEUP_ULP) {
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printf("Not ULP wakeup\n");
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init_ulp_program();
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} else {
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printf("Deep sleep wakeup\n");
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printf("ULP did %"PRIu32" measurements since last reset\n", ulp_sample_counter & UINT16_MAX);
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printf("Thresholds: low=%"PRIu32" high=%"PRIu32"\n", ulp_low_thr, ulp_high_thr);
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ulp_last_result &= UINT16_MAX;
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printf("Value=%"PRIu32" was %s threshold\n", ulp_last_result,
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ulp_last_result < ulp_low_thr ? "below" : "above");
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}
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printf("Entering deep sleep\n\n");
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start_ulp_program();
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ESP_ERROR_CHECK( esp_sleep_enable_ulp_wakeup() );
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#if !CONFIG_IDF_TARGET_ESP32
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/* RTC peripheral power domain needs to be kept on to keep SAR ADC related configs during sleep */
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esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
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#endif
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esp_deep_sleep_start();
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}
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static void init_ulp_program(void)
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{
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esp_err_t err = ulp_load_binary(0, ulp_main_bin_start,
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(ulp_main_bin_end - ulp_main_bin_start) / sizeof(uint32_t));
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ESP_ERROR_CHECK(err);
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ulp_adc_cfg_t cfg = {
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.adc_n = EXAMPLE_ADC_UNIT,
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.channel = EXAMPLE_ADC_CHANNEL,
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.width = EXAMPLE_ADC_WIDTH,
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.atten = EXAMPLE_ADC_ATTEN,
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.ulp_mode = ADC_ULP_MODE_FSM,
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};
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ESP_ERROR_CHECK(ulp_adc_init(&cfg));
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ulp_low_thr = EXAMPLE_ADC_LOW_TRESHOLD;
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ulp_high_thr = EXAMPLE_ADC_HIGH_TRESHOLD;
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/* Set ULP wake up period to 20ms */
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ulp_set_wakeup_period(0, 20000);
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#if CONFIG_IDF_TARGET_ESP32
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/* Disconnect GPIO12 and GPIO15 to remove current drain through
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* pullup/pulldown resistors on modules which have these (e.g. ESP32-WROVER)
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* GPIO12 may be pulled high to select flash voltage.
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*/
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rtc_gpio_isolate(GPIO_NUM_12);
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rtc_gpio_isolate(GPIO_NUM_15);
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#endif // CONFIG_IDF_TARGET_ESP32
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esp_deep_sleep_disable_rom_logging(); // suppress boot messages
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}
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static void start_ulp_program(void)
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{
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/* Reset sample counter */
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ulp_sample_counter = 0;
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/* Start the program */
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esp_err_t err = ulp_run(&ulp_entry - RTC_SLOW_MEM);
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ESP_ERROR_CHECK(err);
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}
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