120 lines
4.1 KiB
C
120 lines
4.1 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 "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 "soc/rtc_periph.h"
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#include "driver/gpio.h"
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#include "driver/rtc_io.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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static void init_ulp_program();
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static void update_pulse_count();
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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, initializing ULP\n");
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init_ulp_program();
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} else {
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printf("ULP wakeup, saving pulse count\n");
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update_pulse_count();
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}
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printf("Entering deep sleep\n\n");
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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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/* GPIO used for pulse counting. */
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gpio_num_t gpio_num = GPIO_NUM_0;
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assert(rtc_gpio_desc[gpio_num].reg && "GPIO used for pulse counting must be an RTC IO");
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/* Initialize some variables used by ULP program.
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* Each 'ulp_xyz' variable corresponds to 'xyz' variable in the ULP program.
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* These variables are declared in an auto generated header file,
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* 'ulp_main.h', name of this file is defined in component.mk as ULP_APP_NAME.
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* These variables are located in RTC_SLOW_MEM and can be accessed both by the
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* ULP and the main CPUs.
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*
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* Note that the ULP reads only the lower 16 bits of these variables.
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*/
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ulp_debounce_counter = 3;
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ulp_debounce_max_count = 3;
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ulp_next_edge = 0;
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ulp_io_number = rtc_gpio_desc[gpio_num].rtc_num; /* map from GPIO# to RTC_IO# */
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ulp_edge_count_to_wake_up = 10;
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/* Initialize selected GPIO as RTC IO, enable input, disable pullup and pulldown */
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rtc_gpio_init(gpio_num);
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rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_INPUT_ONLY);
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rtc_gpio_pulldown_dis(gpio_num);
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rtc_gpio_pullup_dis(gpio_num);
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rtc_gpio_hold_en(gpio_num);
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/* Disconnect GPIO12 and GPIO15 to remove current drain through
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* pullup/pulldown resistors.
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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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esp_deep_sleep_disable_rom_logging(); // suppress boot messages
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/* Set ULP wake up period to T = 20ms.
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* Minimum pulse width has to be T * (ulp_debounce_counter + 1) = 80ms.
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*/
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ulp_set_wakeup_period(0, 20000);
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/* Start the program */
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err = ulp_run(&ulp_entry - RTC_SLOW_MEM);
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ESP_ERROR_CHECK(err);
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}
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static void update_pulse_count()
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{
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const char* namespace = "plusecnt";
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const char* count_key = "count";
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ESP_ERROR_CHECK( nvs_flash_init() );
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nvs_handle handle;
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ESP_ERROR_CHECK( nvs_open(namespace, NVS_READWRITE, &handle));
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uint32_t pulse_count = 0;
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esp_err_t err = nvs_get_u32(handle, count_key, &pulse_count);
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assert(err == ESP_OK || err == ESP_ERR_NVS_NOT_FOUND);
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printf("Read pulse count from NVS: %5d\n", pulse_count);
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/* ULP program counts signal edges, convert that to the number of pulses */
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uint32_t pulse_count_from_ulp = (ulp_edge_count & UINT16_MAX) / 2;
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/* In case of an odd number of edges, keep one until next time */
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ulp_edge_count = ulp_edge_count % 2;
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printf("Pulse count from ULP: %5d\n", pulse_count_from_ulp);
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/* Save the new pulse count to NVS */
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pulse_count += pulse_count_from_ulp;
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ESP_ERROR_CHECK(nvs_set_u32(handle, count_key, pulse_count));
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ESP_ERROR_CHECK(nvs_commit(handle));
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nvs_close(handle);
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printf("Wrote updated pulse count to NVS: %5d\n", pulse_count);
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}
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