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25d04c4742
- Unecessary definitions are removed. - Since the 48-bit RTC hardware timer uses a RC oscillator as clock, it is pretty inaccurate and leads to a RTC time deviation of up to 3 seconds per minute. Therefore, a calibration during the boot time determines a correction factor for the 48-bit RTC hardware timer. Function _rtc_time_to_us uses now this correction factor and converts a raw 48-bit RTC time to a corrected time in microseconds. Thus, the 48-bit RTC timer becomes much more accurate, but it can't still reach the accuracy of the PLL driven 64-bit system timer. The Advantage of using RTC over 64-bit sydtem timer is that it also continues in deep sleep mode and after software reset. - If the 64-bit system timer is used to emulate the RTC timer, it uses the RTC hardware timer to continue its operation after software . |
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| .. | ||
| bin | ||
| cxx | ||
| esp-eth | ||
| esp-wifi | ||
| freertos | ||
| include | ||
| ld | ||
| periph | ||
| vendor | ||
| doc.txt | ||
| esp_events.c | ||
| esp_xtimer.c | ||
| exceptions.c | ||
| gen_esp32part.py | ||
| irq_arch.c | ||
| Makefile | ||
| Makefile.dep | ||
| Makefile.features | ||
| Makefile.include | ||
| periph_cpu.c | ||
| startup.c | ||
| syscalls.c | ||
| thread_arch.c | ||
| tools.c | ||