We fix a bug in atoi_hex when parsing an unneven number of digits
by rotating the entire number 4 bits right as would have been
done if the number had been preceded by a 0 to make the number
of digits even.
The presence of the main function is a hardcoded trigger in sdcc that causes
the interrupt vectors and atomic rollback helpers to be generated as part of
compilation of the file containing the main function.
This makes sure the runtime library is correctly initialized and reduces
crtstart.asm to contain only the banked call helpers.
To ensure that the __interrupt_vect in area HOME is located at the beginning
of the firmware, the linker flags are updated to set the HOME start to
0x00000 and the linker object order is modified to have rtlplayground.rel
first.
Generated code in rtlplayground.asm:
```
;--------------------------------------------------------
; interrupt vector
;--------------------------------------------------------
.area HOME (CODE)
__interrupt_vect:
ljmp __sdcc_gsinit_startup
ljmp _isr_ext0
.ds 5
ljmp _isr_timer0
.ds 5
ljmp _isr_ext1
.ds 5
reti
.ds 7
ljmp _isr_serial
.ds 5
ljmp _isr_timer2
.ds 5
reti
.ds 7
reti
.ds 7
ljmp _isr_ext2
.ds 5
ljmp _isr_ext3
; restartable atomic support routines
.ds 2
sdcc_atomic_exchange_rollback_start::
nop
nop
sdcc_atomic_exchange_pdata_impl:
movx a, @r0
mov r3, a
mov a, r2
movx @r0, a
sjmp sdcc_atomic_exchange_exit
nop
nop
sdcc_atomic_exchange_xdata_impl:
movx a, @dptr
mov r3, a
mov a, r2
movx @dptr, a
sjmp sdcc_atomic_exchange_exit
sdcc_atomic_compare_exchange_idata_impl:
mov a, @r0
cjne a, ar2, .+#5
mov a, r3
mov @r0, a
ret
nop
sdcc_atomic_compare_exchange_pdata_impl:
movx a, @r0
cjne a, ar2, .+#5
mov a, r3
movx @r0, a
ret
nop
sdcc_atomic_compare_exchange_xdata_impl:
movx a, @dptr
cjne a, ar2, .+#5
mov a, r3
movx @dptr, a
ret
sdcc_atomic_exchange_rollback_end::
sdcc_atomic_exchange_gptr_impl::
jnb b.6, sdcc_atomic_exchange_xdata_impl
mov r0, dpl
jb b.5, sdcc_atomic_exchange_pdata_impl
sdcc_atomic_exchange_idata_impl:
mov a, r2
xch a, @r0
mov dpl, a
ret
sdcc_atomic_exchange_exit:
mov dpl, r3
ret
sdcc_atomic_compare_exchange_gptr_impl::
jnb b.6, sdcc_atomic_compare_exchange_xdata_impl
mov r0, dpl
jb b.5, sdcc_atomic_compare_exchange_pdata_impl
sjmp sdcc_atomic_compare_exchange_idata_impl
```
This saves 508 bytes in the HOME area by:
- Getting rid of the expensive hex array indexing
- Having print_short and print_long delegate to print_byte
This is at the expense of increasing the stack depth a tiny bit.
Stack usage isn't an issue so far since I see ~96 bytes of
untouched stack memory.
This adds the MPAGE (sdcc _XPAGE) SFR, which is used by sdcc in `--xstack`
mode to provide the upper byte of the address for `MOVX A, @Ri` and
`MOVX @Ri, A` instructions.
Classic 8051 uses the P2 SFR value for this, but the RTL IP block does not
seem to be using the "Port 2 module".
From the databook:
```
To replace the function of the Port 2 latch in designs that do not use a
Port 2 module, the DW8051 provides an additional special function register,
MPAGE, at SFR address 92h. During MOVX A, @Ri and MOVX @Ri, A instructions,
the DW8051 places the contents of the MPAGE register on the upper 8 address
bits (mem_addr[15:8]). This provides the paging function that is normally
provided by the Port 2 latch. The MPAGE register has no function when a
Port 2 module is used to connect external RAM.
```
The SWTG018AS-A V2.0 is an 8x2.5GBit/s port + 1 SFP+ port unmanged device
It is sold in an unbranded casing e.g. by Ampcom.
Hardware:
SoC: RTL8373N
Additional PHY: RTL8224
Flash: Puya P25D40SH (4MBit, slimmer, not standard SOP-8 package!)
LEDs: 1 Green + 1 Orange per Ethernet port (green designates 2.5GBit)
1 Green LED for the SFP+ port
The photos already show a modified PCB: Unpopulated resistors R52 and R53
have been bridged in order to enable the serial console. The smaller flash
memory chip at U2 has been replaced with a Windbond 128MBit standard-sized
SOIC-8 chip in order to easily use SOIC clamps to flash the device. Also
the serial header has been populated.
The current code for entering commands via the serial CLI is completely
refactored and moved out of rtlplayground.c into a separate file cmd_edit.c
putting code into BANK2.
The serial ring buffer sbuf[] is now exclusively used for receiving
keys, including escape sequences (DEL will generate a 4-byte escape
sequence). The command is now held in cmd_buffer. This reduces
XMEM use, because the serial buffer can be much smaller.
Supported is only editing the current command line via backspace, del,
cursor left and right.
Because the code cannot distinguish escape sequences which are not yet
complete (because the serial isr has not yet put all characters into
the serial buffer) from the dozens of unsupported ones (F-keys/home,
Page up/down, cursor up/down...) they are ignored and remain in the
serial buffer until the ring-pointer overwrites them. This is standard
behaviour for consoles, which will print out garbage for unsupported
characters. In this implementation, the command line buffer and the
visible command line in the terminal are always synced, so garbage
can be removed again by ediing the line.
The code makes several redundant checks in order to prevent race-conditions
between the serial ISR and the comand-editing code.
PR #119 made that no machine-type is selected, so the build will fail.
commit 2f787fee enables us select a machine via a variable, use this to
select a machine-type `KP_9000_6XHML_X2` to build.
logicog
René van Dorst
feelfree69
logicog
Tobias Diedrich
feelfree69
MaDill