ESP32, TIMER, esp_timer

ESP32, TIMER, esp_timer

• us 단위로 timer를 설정합니다.
• esp_timer_get_time() 함수를 부팅 이후 동작 시간을 확인할 수 있습니다.
• esp_sleep_enable_timer_wakeup(), esp_light_sleep_start() 함수를 통해 조금 더 정확하게 delay를 줄  수 있습니다.

0. 참고 사이트

• esp-idf\examples\system\esp_timer
• https://github.com/espressif/esp-idf/tree/master/examples/system/esp_timer
• https://esp-idf.readthedocs.io/en/latest/api-reference/peripherals/timer.html

1. 모듈

2. 보드 연결

3. 소스 설명

주요 API는 다음 Header를 참고하면 됩니다.

• esp-idf\components\esp32\include\esp_timer.h
• esp-idf\components\esp32\include\esp_sleep.h

4. 소스

https://github.com/sglee0223/esp32/tree/master/esp_timer

5. 결과 확인

I (0) cpu_start: App cpu up. I (210) heap_init: Initializing. RAM available for dynamic allocation: I (217) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM I (223) heap_init: At 3FFB3328 len 0002CCD8 (179 KiB): DRAM I (229) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM I (236) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM I (242) heap_init: At 400899FC len 00016604 (89 KiB): IRAM I (248) cpu_start: Pro cpu start user code I (266) cpu_start: Starting scheduler on PRO CPU. I (0) cpu_start: Starting scheduler on APP CPU. I (268) ESP_TIMER: Started timers, time since boot: 2353 us periodic            500000        502341          1          0             0 one-shot                 0       5002346          1          0             0 I (768) ESP_TIMER: Periodic timer called, time since boot: 502387 us I (1268) ESP_TIMER: Periodic timer called, time since boot: 1002364 us I (1768) ESP_TIMER: Periodic timer called, time since boot: 1502364 us I (2268) ESP_TIMER: Periodic timer called, time since boot: 2002364 us periodic            500000       2502341          1          4           555 one-shot                 0       5002346          1          0             0 I (2768) ESP_TIMER: Periodic timer called, time since boot: 2502367 us I (3268) ESP_TIMER: Periodic timer called, time since boot: 3002364 us I (3768) ESP_TIMER: Periodic timer called, time since boot: 3502364 us I (4268) ESP_TIMER: Periodic timer called, time since boot: 4002364 us periodic            500000       4502341          1          8          1070 one-shot                 0       5002346          1          0             0 I (4768) ESP_TIMER: Periodic timer called, time since boot: 4502367 us I (5268) ESP_TIMER: Periodic timer called, time since boot: 5002362 us I (5268) ESP_TIMER: One-shot timer called, time since boot: 5002484 us I (5268) ESP_TIMER: Restarted periodic timer with 1s period, time since boot: 5005715 us I (6268) ESP_TIMER: Periodic timer called, time since boot: 6005732 us periodic           1000000       7005710          2         11          1458 one-shot                 0             0          1          1         11994 I (7268) ESP_TIMER: Periodic timer called, time since boot: 7005736 us I (8268) ESP_TIMER: Periodic timer called, time since boot: 8005732 us periodic           1000000       9005710          2         13          1723 one-shot                 0             0          1          1         11994 I (9268) ESP_TIMER: Periodic timer called, time since boot: 9005736 us I (10268) ESP_TIMER: Periodic timer called, time since boot: 10005732 us I (10278) ESP_TIMER: Entering light sleep for 0.5s, time since boot: 10011541 us I (10278) ESP_TIMER: Woke up from light sleep, time since boot: 10511997 us I (10768) ESP_TIMER: Periodic timer called, time since boot: 11005736 us I (11768) ESP_TIMER: Periodic timer called, time since boot: 12005732 us I (12278) ESP_TIMER: Stopped and deleted timers