Using the TER bit in the TX descriptors when only using a single descriptor for
sending triggered a hardware bug. Thus, stop using the TER bit and store the
currently active TX descriptor in RAM instead.
The Watchdog on the CC2538 only supports 4 intervals (2ms, 16ms, 250ms & 1s).
Since the watchdog timer API specifies a `max_time`, the interval equal or
below that time is selected.
E.g. for `max_time=125ms` the 16ms interval would be selected.
This is outside the tolerance of the `tests/periph_wdt` test.
Co-authored-by: Thomas Geithner <thomas.geithner@dai-labor.de>
The rv32imac supports the A (atomic) extensions containing
read-modify-store operations. This commit modifies the GPIO code to use
these for all bitwise operations. The atomic operations are emitted with
relaxed ordering as they do not require multiprocessor synchronization.
This decreases the duration of the gpio operations from 59 ns to 50 ns
per call. depending a bit on the type of operation.
Just because a user pulls in the DNS client (`sock_dns`) doesn't mean
they want to pull in RDNSS option support as well. Besides, since
`gnrc_ipv6_nib_dns` depends on `gnrc_ipv6_nib`, this forms a circular
dependency that really isn't necessary.
The other applications using `sock_dns` do it too
(`tests/gnrc_sock_dns` and `tests/gnrc_ipv6_nib_dns`) and besides it
doesn't make much sense to include RDNSS option support
(aka `gnrc_ipv6_nib_dns`) just because someone uses the DNS client
(aka `sock_dns`). This dependency will be removed in a later commit.
This is a small optimization to the RISC-V trap handler. By splitting
the call to sched_run from the trap_handle call, loading the previous
thread ptr can be delayed until after it is determined that a schedule
run is required. This shaves of a few cycles during regular interrupts
that do not trigger the scheduler.
This commit reworks the trap entry to only save the callee-saved
registers when a context switch is required. the caller-saved registers
are always stored and restored to adhere to the RISC-V ABI. This saves
considerable cycles on interrupts.
Use RTC helper functions instead of libc functions.
This gives us y2038 safety by the extended epoch
and saves a good chunk of memory:
mktime():
text data bss dec hex filename
24756 232 2736 27724 6c4c testssperiph_rtc/bin/openlabs-kw41z-mini/tests_periph_rtc.elf
rtc_mktime():
text data bss dec hex filename
16348 132 2696 19176 4ae8 tests/periph_rtc/bin/openlabs-kw41z-mini/tests_periph_rtc.elf
