Use Timer1 as baudrate generator.
Timer1 can be programmed to have the same accuracy and deviation as
Timer2, up to 115200 at F_SYS = 125 Mhz. See comment
setup_serial_timer1() comment for valid baudrates and settings.
Timer1 is used in 8-bit auto-reload mode.
Timer2 16-bit auto-reload can now be used for other tasks like SYS_TICK.
Downside of Timer0 is, we have to manually reload
the timer value. Timer2 can do that automaticly.
This saves a lot of time in the interrupt-handler
of the Timer.
Currently Timer2 is used for baudrate-generation
but in a separete commit this is moved to Timer1.
A `%` modulo operator was used instead of a
`&` and-operator, to split a 16 bit value into two
8 bit values.
This causes that the SYSTICKs were 0.1% too fast.
Replace the manual split with a sfr16 type, so the
compiler does the split for us.
This adds an implementation for trapping IGMP packets to the CPU
which will identify IGMPv1/2/3 packets, but handle only v3.
The implementation then inserts/updates/deletes L3 MC entries
in the L3 lookup table. The entries consist of an Ipv4
Destination IP (the IPv4 MC address), a Source IP (0.0.0.0) and
a Portmask. Note that this implementation is not VLAN aware,
as there is no hardware support in the device.
An alternative strategy is to control switching of the L2-MC packets
in which the IPv4-MC packets are transported (dst-MaC is
01:00:5e:xx:yy:zz, with xx:yy:zz corresponding to bits in the Ipv4-MC
address). This will allow to use VLAN-aware packet switching. While
code support is there for table insert/update/deletes, some further
L2 configuration is missing.
There is no support for IPv6 MC, yet.
The RTL8272/3 use 2 32 bit registers to indicate the MAC link speed, the
second register is used for ports 8 and 9, where 9 is the CPU port.
Use both registers.
The Makefile has the version number and generates a version.h which
has VERSION_SW define that looks like "v<VERSION>-g<GIT_SHORT_HASH>".
Software version shows at boot in the serial console.
And shown with command: `version`.
It can also be requested via `information.json`.
```
{
"ip_address": "192.168.10.247",
"ip_gateway": "192.168.10.1",
"ip_netmask": "255.255.255.0",
"mac_address": "1c:2a:a3:23:00:02",
"sw_ver": "v0.1.0-gd48235f",
"hw_ver": "SWGT024-V2.0"
}
```
Adds a timeer for calling the STP state machine which currently sends out
CNF (HELLO) packages.
Identifies incoming STP packets and calls the stp_in() routine to handle these.
So instead do it manual split a uint16_t in to two uint8_t.
The compiler can do it, so reduces user error.
Note: compiler writes the lower/LSB part first.
When that is importent this can´t be used.
Assembly is still the same except note above.
René van Dorst
logicog
Tobias Diedrich