mirror of
https://github.com/espressif/esp-idf.git
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dec4a868d0
Also increase sampling frequency in ulp_adc example and update READMEs. Fixes https://github.com/espressif/esp-idf/issues/1108
93 lines
2.8 KiB
C
93 lines
2.8 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 "esp_sleep.h"
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#include "nvs.h"
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#include "nvs_flash.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 "driver/adc.h"
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#include "driver/dac.h"
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#include "esp32/ulp.h"
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#include "ulp_main.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();
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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();
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void app_main()
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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 %d measurements since last reset\n", ulp_sample_counter & UINT16_MAX);
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printf("Thresholds: low=%d high=%d\n", ulp_low_thr, ulp_high_thr);
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ulp_last_result &= UINT16_MAX;
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printf("Value=%d 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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esp_deep_sleep_start();
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}
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static void init_ulp_program()
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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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/* Configure ADC channel */
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/* Note: when changing channel here, also change 'adc_channel' constant
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in adc.S */
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adc1_config_channel_atten(ADC1_CHANNEL_6, ADC_ATTEN_DB_11);
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adc1_config_width(ADC_WIDTH_BIT_12);
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adc1_ulp_enable();
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/* Set low and high thresholds, approx. 1.35V - 1.75V*/
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ulp_low_thr = 1500;
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ulp_high_thr = 2000;
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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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/* Disable pullup on GPIO15, in case it is connected to ground to suppress
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* boot messages.
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*/
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rtc_gpio_pullup_dis(GPIO_NUM_15);
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rtc_gpio_hold_en(GPIO_NUM_15);
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}
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static void start_ulp_program()
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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) / sizeof(uint32_t));
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ESP_ERROR_CHECK(err);
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}
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