Set the channel with esp_wifi_set_channel(), which adds support for setting
the channel of the STA interface
Get the channel with esp_wifi_get_channel() which returns the actual wifi
channel of the radio, rather than the configured channel.
Since commit e65d1e69e8 there is no longer an
io.FileIO class, so this option is no longer needed.
This option also controlled whether or not files supported being opened in
binary mode (eg 'rb'), and could, if disabled, lead to confusion as to why
opening a file in binary mode silently did the wrong thing (it would just
open in text mode if MICROPY_PY_IO_FILEIO was disabled).
The various VFS implementations (POSIX, FAT, LFS) were the only places
where enabling this option made a difference, and in almost all cases where
one of these filesystems were enabled, MICROPY_PY_IO_FILEIO was also
enabled. So it makes sense to just unconditionally enable this feature
(ability to open a file in binary mode) in all cases, and so just remove
this config option altogether. That makes configuration simpler and means
binary file support always exists (and opening a file in binary mode is
arguably more fundamental than opening in text mode, so if anything should
be configurable then it should be the ability to open in text mode).
Signed-off-by: Damien George <damien@micropython.org>
It seems sometimes gcc with LTO will generate otherwise valid assembly
listings that cause 'as' to error out when generating DWARF debug info; see
https://sourceware.org/bugzilla/show_bug.cgi?id=29494
Therefore, don't enable -g by default if LTO is on.
Enabling LTO=1 DEBUG=1 is still possible but may result in random errors
at link time due to 'as' (the error in this case is "Error: unaligned
opcodes detected in executable segment", and the only other easy workaround
is CFLAGS+=-fno-jump-tables which may increase code size significantly).
Follows on from fdfe4eca74
These were added in Python 3.5.
Enabled via MICROPY_PY_BUILTINS_BYTES_HEX, and enabled by default for all
ports that currently have ubinascii.
Rework ubinascii to use the implementation of these methods.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
PR #9012 (b2e8240268) changed the output to
$(BUILD)/$(PROG) but the tests are still looking for $(PROG).
Also remove the now-unnecessary override of $(PROG) in the standard
variant.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
The separate A and RM toolchains have been discontinued and replaced
by a single toolchain. This updates the links to the RM toolchain to
the new toolchain.
Signed-off-by: David Lechner <david@pybricks.com>
Figure out path to arm-none-eabi-size the same way it's done for the
other binaries, instead of assuming it to be in the user's $PATH.
Signed-off-by: Jacob Siverskog <jacob@teenage.engineering>
Create a new linker section .unitialized_bss for bss that does not need
zero-initialising.
Move gc_heap to this section, which saves ~30ms from rising edge of RESET
to setting a pin HIGH in MicroPython.
Zero fill happens in Pico SDK crt0.S before ROSC is configured. It's very,
very slow.
Signed-off-by: Phil Howard <phil@gadgetoid.com>
stty can provide the current terminal settings, so that they can be
stored in a shell variable and restored after running the firmware. This
avoids the complete "blanking" of the terminal, and thus also removes the
need for the sleep call.
The run target now references the firmware file using the BUILD variable
instead of using the hard coded "build/" path.
The executable now lives in the build directory, and since the build
directory already contains the variant name there is no need to also add
it to the executable.
Signed-off-by: Damien George <damien@micropython.org>
Binaries built using the Make build system now no longer appear in the
working directory of the build, but rather in the build directory. Thus
some paths had to be adjusted.
In-the-field use of these FUS/WS firmware update scripts has exposed some
weak points, causing corrupted FUS/WS firmware to be flashed to the unit.
The problems are mostly caused with the ST GUI application, but sometimes
from un-recognised failures during bin file transfer to the WB55 prior to
running the rfcore_firmware.py script. Other failures were caused by
incorrect load addresses being used, again both from user error copying the
address from the HTML release notes to the GUI tool, but also from
similarly not updating the address correctly in rfcore_firmware.py
To guard against these errors and make it easier to prepare different
versions, this commit adds a few features to the rfcore firmware update
tools:
- When creating the bin file, automatically parse the release note in the
folder to get the correct address.
- Add a footer to the bin file containing the name, version, CRC, address
etc.
- Before flashing rfcore, check if the same version is already installed.
- Verify the CRC and obfuscation key before flashing bin.
- Log the name and version of file being flashed.
The ntptime module was previously only included in the ESP8266 port. This
commit factors that module out into the extmod directory, makes it support
different epochs, and includes it in the rp2 port.
This adds support for the LEGO Hub No. 7, aka LEGO Technic Small hub, aka
LEGO SPIKE Essential hub. This board is largely similar to Hub No. 6:
- Same MCU (STM32F413 - different packaging with fewer pins).
- Same Bluetooth chip (TI CC2564).
- Same IMU chip.
- Similar external flash chip - 4MiB instead of 32MiB.
- 2 I/O ports instead of 6.
- No display - only status and battery LEDs.
- Different LED driver chip.
- Only 1 button which is also the power button.
- No speaker.
Signed-off-by: David Lechner <david@pybricks.com>
This adds configurable macros to define the timer and channel used to
provide the Bluetooth 32768 MHz clock. This will allow code to be shared
with LEGO_HUB_NO7.
Signed-off-by: David Lechner <david@pybricks.com>
This changes spiflash.py to read the flash chip ID at runtime to select the
read/write/erase commands. This will allow the code to be shared with
LEGO_HUB_NO7 which doesn't use the 32-bit commands.
Also remove an unused constant while we are touching this.
Signed-off-by: David Lechner <david@pybricks.com>
This changes appupdate.py to get the filesystem size at runtime. This will
allow the code to be shared with LEGO_HUB_NO7 which has a similar flash
chip with a different size.
Signed-off-by: David Lechner <david@pybricks.com>
This changes all uses of pins to use the alias names of the pins. This
makes the code easier to understand and will also allow sharing more code
with LEGO_HUB_NO7.
Signed-off-by: David Lechner <david@pybricks.com>
Also use mkrules.mk's submodule target rather than duplicating the call to
`submodule sync`.
Until we can find a way to use idf.py/cmake to discover submodules we have
no way to discover optional or board-specific submodules so need to err on
the side of including everything.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Used to be special-cased for Pico, but now everything depends on
micropython-lib if it's using a frozen manifest.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
For bare metal ARM & xtensa targets, passing -g will make the ELF file
larger but doesn't change the binary size. However, this means tools like
gdb, addr2line, etc can extract source-level information from the ELF.
Also standardise -ggdb to -g, these produce the exact same ELF file on
arm-none-eabi-gcc and will use DWARF format for all these ports.
This adds #ifdefs around each of the mp_hal_* time functions for the unix
port. This allows variants to override individual functions as needed.
Signed-off-by: David Lechner <david@pybricks.com>
Still see some USB issues apparently caused by delays loading wifi
firmware. cyw43_delay_ms is used to wait in the driver, so we should call
the event hook in there.
Fixes#8963.
The state machines were not properly restarted in the case that the same
PIO program was shared among multiple StateMachine instances. This is
because only the first StateMachine to use the program would set the
rp2_state_machine_initial_pc variable.
See https://forum.micropython.org/viewtopic.php?f=21&t=12776&p=69464#p69464
Fixes:
- Should read `definitions` rather than `defintions`.
- Should read `resolution` rather than `resoultion`.
- Should read `inefficient` rather than `inefficent`.
- Should read `closed` rather than `closded`.
Signed-off-by: Tim Gates <tim.gates@iress.com>
With a new option to evenly split the GC heap over multiple areas. This
adds code coverage for gc_add() and code associated with
MICROPY_GC_SPLIT_HEAP.
1. Add -Wno-array-bounds to avoid false positive on gcc 12.1; see related
issue #8685.
2. Remove always-true not-NULL-check (Msg.Rsp.Args.Common.Bssid is an array
not a pointer).
3. Fix pointer-to-freed-stack in wlan_set_security.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Originally in drivers/ninaw10/nina_wifi_bsp.c but that isn't a QSTR source.
Also remove outdated commment about root pointers in mpconfigport.h.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This is a statically-allocated UART (see machine_uart.c), and doesn't
contain any heap pointers other than the ringbufs (which are already root
pointers), so no need to track it additionally.
Saves needing to add mpbthciport.c to the QSTR sources.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
rp2: change tud_task() to tud_task_ext().
mimxrt: use lib/tinyusb/src/portable/chipidea/ci_hs/dcd_ci_hs.c instead of
lib/tinyusb/src/portable/nxp/transdimension/dcd_transdimension.c.
nrf: add a definition for the changed tud_task(). tud_task() is changed
to tud_task_ext(), and the #define for backward compatibility is in
src/device/usbd.h.
The items I know which are fixed with this version:
- Fix for the SAMD USB lock-up.
- Support the MIMXRT11XX series of MCUs.
- Fix a wrong pin definition for MIMXRT1050_EVKB.
Tested with the MIMXRT boards, rp2 Pico, SAMD boards, nrf board.
This moves the libffi submodule variable modifier inside of the if
statement where it is actually used so that the submodule will only be
checked out if it is actually being used.
A new DEPLIBS variable is also introduced to prevent building the libffi
submodule when not needed.
Signed-off-by: David Lechner <david@pybricks.com>
All ports that use mbedtls use the custom error messages in
mp_mbedtls_errors.c. This commit simplifies the build so that ports don't
need to explicitly add this file, it's now used by default when mbedtls is
enabled.
Signed-off-by: Damien George <damien@micropython.org>
The reasons to make this switch are:
- The axtls library is not being maintained/updated, mbedtls is.
- So CI and tests can run against mbedtls, which is now the main TLS
library used by the ports (eg stm32, rp2, mimxrt, esp32). Only esp8266
uses axtls.
Increases unix standard build on x86-64 by about 89000 bytes.
Signed-off-by: Damien George <damien@micropython.org>
Based on existing bare-metal config from stm32. Also uses shorter error
messages from lib/mbedtls_errors.
Signed-off-by: Damien George <damien@micropython.org>
This uses MP_REGISTER_ROOT_POINTER() to register repl_line
instead of using a conditional inside of mp_state_vm_t.
Signed-off-by: David Lechner <david@pybricks.com>
All in-tree uses of MICROPY_PORT_ROOT_POINTERS have been replaced with
MP_REGISTER_ROOT_POINTER(), so now we can remove both
MICROPY_PORT_ROOT_POINTERS and MICROPY_BOARD_ROOT_POINTERS from the code
and remaining config files.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register pyb_stdio_uart and removes
the same from mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register all port-specific root
pointers in the renesas-ra port.
Signed-off-by: David Lechner <david@pybricks.com>
pyb_hid_report_desc is not used anywhere in the renesas-ra port (probably
was copied from stm32 port).
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register keyboard_interrupt_obj
and removes the same from mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register all port-specific root
pointers in the esp2866 port.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register all port-specific root
pointers for the cc3200 port.
Signed-off-by: David Lechner <david@pybricks.com>
mp_const_user_interrupt was listed as a root pointer but not used anywhere
in the code base, so it can be removed.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register mod_network_nic_list and
removes the same from all mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register bluetooth_nimble_memory
and bluetooth_nimble_root_pointers and removes the same from all
mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register
bluetooth_btstack_root_pointers and removes the same from all
mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register mp_wifi_spi, mp_wifi_timer
and mp_wifi_sockpoll_list and removes the same from all mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register mmap_region_head and
removes the same from mpconfigport.h.
Signed-off-by: David Lechner <david@pybricks.com>
This uses MP_REGISTER_ROOT_POINTER() to register the readline_history root
pointer array used by shared/readline.c and removes the registration from
all mpconfigport.h files.
This also required adding a new MICROPY_READLINE_HISTORY_SIZE config option
since not all ports used the same sized array.
Signed-off-by: David Lechner <david@pybricks.com>
This adds new compile-time infrastructure to parse source code files for
`MP_REGISTER_ROOT_POINTER()` and generates a new `root_pointers.h` header
file containing the collected declarations. This works the same as the
existing `MP_REGISTER_MODULE()` feature.
Signed-off-by: David Lechner <david@pybricks.com>
Some devices, such as the LightBlue BTLE app on iOS, try to use Bluetooth 5
when connecting to a device. This means that they will send a
BLE_GAP_EVT_PHY_UPDATE_REQUEST message to shift to a new physical layer.
If this event isn't handled, LightBlue (and likely other Bluetooth 5.0
central devices) will try to connect and then fail, staying in
"Connecting..." state forever. This message should be replied to with
sd_ble_gap_phy_update, as documented in
drivers/bluetooth/s140_nrf52_6.1.1/s140_nrf52_6.1.1_API/include/ble_gap.h.
This commit handles the event. LightBlue can now successfully connect to a
BTLE device on a P10059 nRF52840 dongle running MicroPython. Two other
related events have logging added in case they are needed in the future.
Commit 0e28a1f0e5 made it possible to set
-march=armv6m. It needs to be used when freezing for rp2.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Since nlr_jump_fail() exits the process, it can leave the terminal in raw
mode which means characters are not echoed. Fix this by restoring the
original terminal mode.
Signed-off-by: David Lechner <david@pybricks.com>
When a flash write/erase is in progress, we need to ensure that the
other core cannot be using XIP.
This also implements MICROPY_BEGIN_ATOMIC_SECTION as a full mutex, which
is necessary as it's used to syncronise access to things like the scheduler
queue.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
The goal is to avoid a situation where core 1 is shut down while holding
the tinyusb spinlock, which could happen during soft reset if
mp_thread_deinit is called while core1 is running tud_task().
This also fixes a latent race where the two cores are competing to
decrement and compare `vm_hook_divisor` with no mem fence or atomic
protection -- only core0 will now do this.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
To override it a board must define MICROPY_BOARD_FATAL_ERROR to a function
that takes a string message and does not return.
Signed-off-by: Damien George <damien@micropython.org>
The file `ports/unix/moduos.c` uses `errno` so it needs to include
`errno.h`, otherwise a compiler error can occur.
Signed-off-by: David Lechner <david@pybricks.com>
Ensure that nimble and cyw43-driver are initialised when the board requires
it. Also make these work with `make submodules`.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Commit 9670a156da missed one renaming of
MICROPY_PY_WIZNET5K to MICROPY_PY_NETWORK_WIZNET5K which prevented the
Wiznet interface from being enabled.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This includes:
- Configuration file for the cyw43-driver.
- Integration of cyw43-driver into the build, using lwIP.
- Enhancements to machine.Pin to support extension IO pins provided by the
CYW43xx.
- More mp-hal pin helper functions.
- mp_hal_get_mac_ascii MAC address helper function.
- Addition of rp2.country() function to set the country code.
A board can enable this driver by setting MICROPY_PY_NETWORK_CYW43 in their
cmake snippet.
Work done in collaboration with Graham Sanderson and Peter Harper.
Signed-off-by: Damien George <damien@micropython.org>
It is more reliable and scales better when more components need it.
Work done in collaboration with Graham Sanderson and Peter Harper.
Signed-off-by: Damien George <damien@micropython.org>
Prior to this commit the following code would lock up the device when
Ctrl-D is entered at the REPL:
import gc, _thread
def collect_thread():
while True:
gc.collect()
_thread.start_new_thread(collect_thread, [])
Fixes part of #8494.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This gets basic machine.lightsleep([n]) behaviour working on the rp2 port.
It supports:
- Calling lightsleep without a specified period, in which case it uses xosc
dormant mode. There's currently no way to wake it up from this state,
unless you write to raw registers to enable a GPIO wake up source.
- Calling lightsleep with a period n in milliseconds. This period must be
less than about 72 minutes and uses timer alarm3 to wake it up.
The RTC continues to run during lightsleep, but other peripherals have
their clock turned off during the sleep.
It doesn't yet support longer periods than 72 minutes, or waking up from
GPIO IRQ.
Measured current consumption from the USB port on a PICO board is about
1.5mA when doing machine.lightsleep(5000), and about 0.9mA when doing
machine.lightsleep().
Addresses issue #8770.
Signed-off-by: Damien George <damien@micropython.org>
This ROM level is not yet fully defined, but it at least enables
MICROPY_PY_SYS_TRACEBACKLIMIT. The coverage build should have everything
enabled, so it makes sense to use this ROM level for it.
Signed-off-by: Damien George <damien@micropython.org>
So that the default configuration for the dev and coverage variants
includes all options set by MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES.
Note that enabling MICROPY_PY_SYS_STDIO_BUFFER on unix doesn't do anything
because unix doesn't use shared/runtime/sys_stdio_mphal.c.
Signed-off-by: Damien George <damien@micropython.org>
The default is the same as before: MICROPY_PY_USELECT=0 and
MICROPY_PY_USELECT_POSIX=1. But now this can be easily overridden at the
make command-line using, eg:
make VARIANT=dev CFLAGS_EXTRA=-DMICROPY_PY_USELECT=1
Signed-off-by: Damien George <damien@micropython.org>
Prior to this commit, running scan() without any APs available would give:
>>> wl.scan()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: Wifi Unknown Error 0x0102
Signed-off-by: Damien George <damien@micropython.org>
When tested, this reduces default MP binary sizes by approx 2-2.5%, and
very marginally increases performance in benchmarks. Build times seem very
similar to non-LTO when using gcc 12.
See #8733 for further discussion.
Signed-off-by: Angus Gratton <gus@projectgus.com>
Prerequisite for enabling Link Time Optimisation.
The _bl_state address is the same as _estack, but _estack is referred to as
a uint32_t elsewhere in the code. LTO doesn't like it when the same symbol
has two different types.
Signed-off-by: Angus Gratton <gus@projectgus.com>
Replaces preprocessor macro for SDRAM option from #ifdef to #if in order to
allow always setting the define `MICROPY_HW_SDRAM_AVAIL` just with the
appropriate value 0/1. This eliminates one `if` in the Makefile.
Add esp32.wake_on_ulp() to give access to esp_sleep_enable_ulp_wakeup(),
which is needed to allow the ULP co-processor to wake the main CPU from
deep sleep.
Allow esp32.ULP.load_binary() to use the maximum amount of memory available
again, which is 2040 bytes unless MICROPY_HW_RTC_USER_MEM_MAX is
customized.
This value regressed in 3d49b157b8
Using it for the rx-timeout. The value is given as ms, which is then
converted to character times. A value of less than a character time will
cause the rx call to return immediately after 1 character, which may be
inefficient at high transmission rates.
Addresses #8778.
This separates extmod source files from `py.mk`. Previously, `py.mk`
assumed that every consumer of the py/ directory also wanted to include
extmod/. However, this is not the case. For example, building mpy-cross
uses py/ but doesn't need extmod/.
This commit moves all extmod-specific items from `py.mk` to `extmod.mk` and
explicitly includes `extmod.mk` in ports that use it.
Signed-off-by: David Lechner <david@pybricks.com>
The following changes are made:
- Guard entire file with MICROPY_PY_LWIP, so it can be included in the
build while still being disabled (for consistency with other extmod
modules).
- Add modlwip.c to list of all extmod source in py/py.mk and
extmod/extmod.cmake so all ports can easily use it.
- Move generic modlwip GIT_SUBMODULES build configuration code from
ports/rp2/CMakeLists.txt to extmod/extmod.cmake, so it can be reused by
other ports.
- Remove now unnecessary inclusion of modlwip.c in EXTMOD_SRC_C in esp8266
port, and in SRC_QSTR in mimxrt port.
Signed-off-by: Damien George <damien@micropython.org>
The WLAN.config() method now supports "ssid", "security" and "key" as
aliases to the existing "essid", "authmode" and "password", which are now
deprecated. The help text and setup helper are also updated.
Addresses issue #8083.
The WLAN.config() method now supports "ssid", "security" and "key" as
aliases to the existing "essid", "authmode" and "password", which are now
deprecated.
Addresses issue #8083.
Updates the Zephyr port build instructions and CI to use the latest Zephyr
release tag.
Tested on frdm_k64f.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>
When MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1 is enabled the port's hardware
I2C transfer functions should support the MP_MACHINE_I2C_FLAG_WRITE1
option, but software I2C will not. So add a flag to the I2C protocol
struct so each individual protocol can indicate whether it supports this
option or not.
Fixes issue #8765.
Signed-off-by: Damien George <damien@micropython.org>
Both led_init and led_state are configurable via MBOOT_BOARD_LED_INIT and
MBOOT_BOARD_LED_STATE respectively, so don't need to be MP_WEAK.
Furthermore, led_state and led0_state are private to ui.c so can be made
static.
Signed-off-by: Damien George <damien@micropython.org>
This IO was enabled in IDF commit 68f8b999bb69563f2f3d1d897bc073968f41f3bf,
which is available in IDF release v4.3.2 and above.
Signed-off-by: Damien George <damien@micropython.org>
Otherwise include directories are added unconditionally to the build
variables if the component (submodule) is checked out. This can lead to,
eg, the esp32 build using lib/lwip header files, instead of lwip header
files from the IDF.
Fixes issue #8727.
Signed-off-by: Damien George <damien@micropython.org>
System config block contains hardware unrelated to USB. So calling
`__SYSCFG_CLK_DISABLE()` during `HAL_PCD_MspDeInit()` has an adverse effect
on other system functionality.
Removing call to `__SYSCFG_CLK_DISABLE()` to rectify this issue.
This call was there since the beginning of the USB CDC code, added in
b30c02afa0.
According to ST Errata ES0206 Rev 18, Section 2.2.1, on STM32F427x,
STM32F437x, STM32F429x and STM32F439x.
If the system tick interrupt is enabled during stop mode while certain
bits are set in the DBGMCU_CR, then the system will immediately wake
from stop mode.
Suggested workaround is to disable system tick timer interrupt when
entering stop mode.
According to ST Errate ES0394 Rev 11, Section 2.2.17, on STM32WB55Cx and
STM32WB35Cx.
If the system tick interrupt is enabled during stop 0, stop 1 or stop 2
while certain bits are set in DBGMCU_CR, then system will immediately
wake from stop mode but the system remains in low power state. The CPU
therefore fetches incorrect data from inactive Flash, which can cause a
hard fault.
Suggested workaround is to disable system tick timer interrupt when
entering stop mode.
This was added by mistake in 8f68e26f79 when
adding support for G4 MCUs, which does not using this get_bank() function.
FLASH_OPTR_DBANK is only defined on G4 and L4 MCUs, so on H7 this
FLASH_BANK_2 code was being wrongly excluded.
Signed-off-by: Damien George <damien@micropython.org>
Also remove redundant modusocket.c and modnetwork.c sources, they are
already added by extmod/extmod.cmake.
Signed-off-by: Damien George <damien@micropython.org>
The callback passed to add_alarm_in_ms must return microseconds, even
though the initial delay is in milliseconds. Fix this use, and to avoid
further confusion use the add_alarm_in_us function instead.
Signed-off-by: Damien George <damien@micropython.org>