Commit graph

19 commits

Author SHA1 Message Date
Ivan Grokhotkov
42e9d49bb1 newlib: implement gettimeofday using of esp_timer 2017-08-28 11:35:27 +08:00
Ivan Grokhotkov
abe9516fdc newlib: implement usleep 2017-08-21 15:58:28 +08:00
Ivan Grokhotkov
8ccb2a4990 esp32: make time monotonic across resets
Small changes to clock calibration value will cause increasing errors
the longer the device runs. Consider the case of deep sleep, assuming
that RTC counter is used for timekeeping:
- before sleep:
   time_before = rtc_counter * calibration_val
- after sleep:
   time_after = (rtc_counter + sleep_count) * (calibration_val + epsilon)
where 'epsilon' is a small estimation error of 'calibration_val'.
The apparent sleep duration thus will be:
time_after - time_before = sleep_count * (calibration_val + epsilon)
                           + rtc_counter * epsilon

Second term on the right hand side is the error in time difference
estimation, it is proportional to the total system runtime (rtc_counter).

To avoid this issue, this change makes RTC_SLOW_CLK calibration value
persistent across restarts. This allows the calibration value update to
be preformed, while keeping time after update same as before the update.
2017-06-16 12:06:04 +08:00
Ivan Grokhotkov
cc8af68244 syscalls: fix wraparound of RTC time
This change removes the erroneous cast to uint32_t (which caused time to
wrap around after 1 hour) and splits the multiplication into two terms
to remove the wraparound after 13 days.

Ref. https://esp32.com/viewtopic.php?f=13&t=1908
2017-06-12 15:21:43 +08:00
Ivan Grokhotkov
6353bc40d7 Add support for 32k XTAL as RTC_SLOW_CLK source
- RTC_CNTL_SLOWCLK_FREQ define is removed; rtc_clk_slow_freq_get_hz
  function can be used instead to get an approximate RTC_SLOW_CLK
  frequency

- Clock calibration is performed at startup. The value is saved and used
  for timekeeping and when entering deep sleep.

- When using the 32k XTAL, startup code will wait for the oscillator to
  start up. This can be possibly optimized by starting a separate task
  to wait for oscillator startup, and performing clock switch in that
  task.

- Fix a bug that 32k XTAL would be disabled in rtc_clk_init.

- Fix a rounding error in rtc_clk_cal, which caused systematic frequency
  error.

- Fix an overflow bug which caused rtc_clk_cal to timeout early if the
  slow_clk_cycles argument would exceed certain value

- Improve 32k XTAL oscillator startup time by introducing bootstrapping
  code, which uses internal pullup/pulldown resistors on 32K_N/32K_P
  pins to set better initial conditions for the oscillator.
2017-04-26 12:43:22 +08:00
Ivan Grokhotkov
dbf60eb922 rtc: fix typo in RTC_CNTL_SLOWCLK_FREQ macro name 2017-02-22 14:40:36 +08:00
Ivan Grokhotkov
90c43ea95e newlib: fix register used for DPORT/RTC bug workaround
While there was no register at DR_REG_FRC_TIMER_BASE + 0x60, due to
peripheral address space wraparound this write actually affected one of
FRC2 registers, which is used by WiFi stack to implement legacy
ets_timer APIs.
This change uses FRC_TIMER_LOAD_REG(0) instead, which can be set to
known value safely.
2017-01-19 00:36:30 +08:00
Ivan Grokhotkov
7776d3e065 time: only define {get,set}_boot_time if FRC1 or RTC is used as time source
Fixes https://github.com/espressif/esp-idf/issues/238
2017-01-17 12:29:09 +08:00
Ivan Grokhotkov
8c25a0fd9d time: workaround for FRC_TIMER_INT_REG write issue
In some cases (when RTC register reads are performed from the APP CPU), a write to FRC_TIMER_INT_REG may be lost on the bus.
Writing to another DPORT register immediately before or after that works around the issue.
We write one dummy value to an address which doesn’t have any register associated with it.

Fixes https://github.com/espressif/arduino-esp32/issues/120
2017-01-17 12:29:09 +08:00
Ivan Grokhotkov
b24ac487cb newlib: use RTC_STORE registers to keep boot time instead of RTC_SLOW_MEM
This allows RTC_SLOW_MEM to be powered down in deep sleep if no other variables are placed into RTC_SLOW_MEM.
2017-01-12 14:43:34 +08:00
Jeroen Domburg
655fd2986a Add interrupt allocation scheme / interrupt sharing. Also modifies drivers and examples. Also allows interrupts
to be marked specifically as having a handler that's all in IRAM.
2016-12-08 12:39:33 +08:00
Ivan Grokhotkov
8b2f933a51 Implement system_* APIs in IDF 2016-11-22 21:14:36 +08:00
Ivan Grokhotkov
fcba7e278d Merge branch 'bugfix/github_issues' into 'master'
Fixes for github issues

This MR contains a bunch of small fixes for issues raised on Github and esp32.com forum:

- vfs doesn't check error code returned by open syscall
- spi_flash doesn't work when built in release mode
- duplicate definition of O_NONBLOCK when combining LwIP socket.h with sys/fcntl.h
- wrong order of creation of standard streams
- `_times_r` returning incorrect values, causing `clock`to return double of the actual time
- driver/gpio.h: comment fix
- wifi event handlers: fix incorrect MAC address printed by logging statements
- move some functions out of IRAM when compiling for bootloader

Please check commit descriptions for links to issues/forum posts and more details.


See merge request !183
2016-11-09 10:12:25 +08:00
Ivan Grokhotkov
d29935b9ce newlib: fix _times_r syscall implementation
tms_cstime should only take system time in child processes into account, so has to be zero.
https://github.com/espressif/esp-idf/issues/81
2016-11-08 20:17:08 +08:00
Ivan Grokhotkov
8bdcf0c5f7 newlib: fix compilation error when no timers are enabled in menuconfig 2016-11-04 10:55:25 +08:00
Ivan Grokhotkov
eb2c633cbf newlib: implement settimeofday, integrate LwIP SNTP, add SNTP example 2016-11-03 12:46:46 +08:00
Ivan Grokhotkov
c534dedf2d newlib: implement time syscalls 2016-11-02 17:31:35 +08:00
Ivan Grokhotkov
6f1d3ce4a7 vfs: code review fixes
- fix typo in readme
- remove unneeded extern declaration
- fix header guard macro
- tabs->spaces in syscalls.c
- spaces->tabs in tasks.c
2016-10-27 17:25:38 +08:00
Ivan Grokhotkov
b3b8334d54 vfs and newlib: small fixes
- spaces->tabs in tasks.c
- update vfs_uart.c to use per-UART locks
- add license to vfs_uart.c
- allocate separate streams for stdout, stdin, stderr, so that they can be independently reassigned
- fix build system test failure
2016-10-27 17:19:39 +08:00