This implementation provides the same interface and uses the same
datastructures as used by BootROM, i.e. is a drop-in replacement for it.
But it offers one advantage: it allows to run single iteration of
event-pumping loop.
Original BootROM function are renamed, prefixed with underscore. There's
a switch which allows to use forward calls to them, for compatibility
testing.
The implementation also includes workarounds for hardware timer handler,
and these workarounds may be SDK version specific.
Allows to set (in case keyword args are given) or query (in case a single
"symbolic keyword" (a string, value is the same as keyword)) arbitrary
interface paramters (i.e. extensible and adaptable to various hardware).
Example usage:
ap_if = network.WLAN(1)
ap_if.config(essid="MicroPython on Air")
print(ap_if.config("essid"))
Allows to up/down interface when called with a boolean, or query current
state if called without args. This per-interface method is intended to
supersede adhoc network.wifi_mode() function.
On ESP8266, there're 2 different interfaces. Pretending it's not the case
desn't make sense. So, network.WLAN() now takes interface id, and returns
interface object. Individual operations are then methods of interface
object. Some operations require i/f of specific type (e.g. .connect()
makes sense only for STA), other are defined for any (e.g. .ifconfig(),
.mac()).
None of the other ports do, since introduction of mp_state_ctx_t. In
the case of current esp8266 port, heap is inside BSS, so scanning it
picked up a lot of dead pointers.
Enabling standard assert() (by removing -DNDEBUG) produces non-bootable
binary (because all messages go to .rodata which silently overflows).
So, for once-off debugging, have a custom _assert().
Initialize RTC period coefficients, etc. if RTC RAM doesn't contain valid
values. time.time() then will return number of seconds since power-on, unless
set to different timebase.
This reuses MEM_MAGIC for the purpose beyond its initial purpose (but the whole
modpybrtc.c need to be eventually reworked completely anyway).
