ESP32 Forum

Code: Select all

#include <stdio.h>
#include "esp_sleep.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "ulp_lp_core.h"
#include "ulp_main.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "esp_sleep.h"

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");

static void init_ulp_program(void);

static const char *TAG = "example";
extern uint32_t ulp_loop_count;

void app_main(void)
{
    printf("Hello world!\n");
    printf("ESP32-C6 ULP Playground\n");

    esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
    if (cause != ESP_SLEEP_WAKEUP_TIMER) {
        printf("Not a TIMER wakeup, initializing ULP first time! \n");
        init_ulp_program();
    }
    else {
        printf("Woke up from a timer DO NOT INITIALIZE AGAIN ULP. \n");
    }

    
    printf("ULP Loop Count: %d\n", (int)ulp_loop_count);
    vTaskDelay(pdMS_TO_TICKS(5000));
    printf("ULP Loop Count: %d\n", (int)ulp_loop_count);
    esp_sleep_enable_timer_wakeup(5000 * 1000);
    esp_deep_sleep_start();
    
}


static void init_ulp_program(void)
{
    esp_err_t err = ulp_lp_core_load_binary(ulp_main_bin_start, (ulp_main_bin_end - ulp_main_bin_start));
    ESP_ERROR_CHECK(err);

    // Start the program
    ulp_lp_core_cfg_t cfg = {
        .wakeup_source = ULP_LP_CORE_WAKEUP_SOURCE_LP_TIMER,
        .lp_timer_sleep_duration_us = 2*1000*1000,
    };

    err = ulp_lp_core_run(&cfg);
    ESP_ERROR_CHECK(err);
}

Code: Select all

#include <stdint.h>
#include <stdbool.h>
#include "ulp_lp_core.h"
#include "ulp_lp_core_utils.h"
#include "ulp_lp_core_gpio.h"

volatile uint32_t loop_count;

int main (void)
{
  loop_count++;
}

Code: Select all

#
# Ultra Low Power (ULP) Co-processor
#
CONFIG_ULP_COPROC_ENABLED=y
CONFIG_ULP_COPROC_TYPE_LP_CORE=y
CONFIG_ULP_COPROC_RESERVE_MEM=4096
CONFIG_ULP_SHARED_MEM=0x10

Code: Select all

# Set usual component variables
set(app_sources "lp_core_gpio_example_main.c")

idf_component_register(SRCS ${app_sources}
                       REQUIRES ulp soc
                       WHOLE_ARCHIVE)

#
# ULP support additions to component CMakeLists.txt.
#
# 1. The ULP app name must be unique (if multiple components use ULP).
set(ulp_app_name ulp_${COMPONENT_NAME})
#
# 2. Specify all C and Assembly source files.
#    Files should be placed into a separate directory (in this case, ulp/),
#    which should not be added to COMPONENT_SRCS.
set(ulp_sources "ulp/main.c")

#
# 3. List all the component source files which include automatically
#    generated ULP export file, ${ulp_app_name}.h:
set(ulp_exp_dep_srcs ${app_sources})

#
# 4. Call function to build ULP binary and embed in project using the argument
#    values above.
ulp_embed_binary(${ulp_app_name} "${ulp_sources}" "${ulp_exp_dep_srcs}")