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abecab7525
implement time syscalls This change adds optional support for libc time functions. New menuconfig option allows selecting FRC1, RTC, both, or none to be used for timekeeping. - If only FRC1 timer is used, gettimeofday will provide time at microsecond resolution. Time will not be preserved when going into deep sleep mode. - If both FRC1 and RTC timers are used, timekeeping will continue in deep sleep. Time will be reported at 1 microsecond resolution. - If only RTC timer is used, timekeeping will continue in deep sleep, but time will be measured at 6.(6) microsecond resolution. Also the gettimeofday function itself may take longer to run. - If no timers are used, gettimeofday function will return -1 and set errno to ENOSYS. `times` function returns time derived from FreeRTOS ticks. It reports all as 'system' time, 'user' time is reported as zero. `settimeofday` function may be used to set current time. LwIP SNTP module is hooked up into the system through `settimeofday`/`gettimeofday`. Example demonstrating this functionality is also added. ref. TW6415 See merge request !168