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https://github.com/espressif/esp-idf.git
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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/* ULP riscv 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 "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 "esp32s2/ulp.h"
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#include "esp32s2/ulp_riscv.h"
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#include "ulp_main.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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static void init_ulp_program(void);
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void app_main(void)
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{
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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_0);
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rtc_gpio_set_direction(GPIO_NUM_0, RTC_GPIO_MODE_INPUT_ONLY);
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rtc_gpio_pulldown_dis(GPIO_NUM_0);
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rtc_gpio_pullup_dis(GPIO_NUM_0);
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rtc_gpio_hold_en(GPIO_NUM_0);
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esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
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/* not a wakeup from ULP, load the firmware */
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if (cause != ESP_SLEEP_WAKEUP_ULP) {
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printf("Not a ULP-RISC-V wakeup, initializing it! \n");
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init_ulp_program();
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}
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/* ULP Risc-V read and detected a change in GPIO_0, prints */
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if (cause == ESP_SLEEP_WAKEUP_ULP) {
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printf("ULP-RISC-V woke up the main CPU! \n");
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printf("ULP-RISC-V read changes in GPIO_0 current is: %s \n",
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(bool)(ulp_gpio_level_previous == 0) ? "Low" : "High" );
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}
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/* Go back to sleep, only the ULP Risc-V will run */
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printf("Entering in deep sleep\n\n");
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/* Small delay to ensure the messages are printed */
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vTaskDelay(100);
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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(void)
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{
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esp_err_t err = ulp_riscv_load_binary(ulp_main_bin_start, (ulp_main_bin_end - ulp_main_bin_start));
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ESP_ERROR_CHECK(err);
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/* The first argument is the period index, which is not used by the ULP-RISC-V timer
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* The second argument is the period in microseconds, which gives a wakeup time period of: 20ms
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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_riscv_run();
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ESP_ERROR_CHECK(err);
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}
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