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PROGRAM:

NAME

ao-dbg - hex debugger for cc1111 processors

SYNOPSIS

ao-dbg [-t cpu-type] [-X frequency] [-c] [-r listen-port] [-Z listen-port] [-s] [-S] [-p
prompt] [-V] [-v] [-H] [-h] [-m] [-T tty-device] [--tty tty-device] [-D altos-device]
[--device altos-device]

DESCRIPTION

ao-dbg connects to a cc1111 processor through either a suitable cc1111 board or a cp2103
usb to serial converter board, using the GPIO pins available on that chip. It provides an
interface compatible with the 8051 emulator from sdcc called s51, but communicating with
the real chip instead of an emulation. Using a modified version of the SDCC debugger
(sdcdb), you can control program execution on the target machine at source-level.

OPTIONS

The command line options are designed to be compatible with the 8051 emulator so that it
can be used with sdcdb. As such, they're all one letter long.

-t cpu-type
The 8051 emulator can operate as one of several different chips. Oddly, the real
hardware cannot, so this option is ignored.

-X frequency
Similarly, the emulator can pretend to run at an arbitrary frequency which the real
hardware cannot do. Ignored.

-c

-s

-S

-v

-V All ignored.

-r listen-port, -Z listen-port
The emulator and sdcdb communicate through a network socket. This option switches
the debugger from communicating through stdin/stdout to listening on a specific
network port instead. Once a connection is made, the debugger continues on, using
that network port for command input and output. The debugger uses port 9756, and
attempts to connect before launching ao-dbg, so if ao-dbg is listening on this port
before sdcdb is started, sdcdb will end up talking to the existing ao-dbg instance.
That's often useful for debugging ao-dbg itself.

-p prompt
This sets the command prompt to the specified string.

-P This sets the command prompt to a single NUL character. This is for use by sdcdb.

-h This should print a usage message, but does nothing useful currently.

-m This option is not present in the original 8051 emulator, and causes ao-dbg to dump
all commands and replies that are received from and sent to sdcdb.

-T tty-device | --tty tty-device
This selects which tty device the debugger uses to communicate with the target
device. The special name 'BITBANG' directs ao-dbg to use the cp2103 connection,
otherwise this should be a usb serial port connected to a suitable cc1111 debug
node.

-D AltOS-device | --device AltOS-device
Search for a connected device. This requires an argument of one of the following
forms:

TeleMetrum:2
TeleMetrum
2

Leaving out the product name will cause the tool to select a suitable product,
leaving out the serial number will cause the tool to match one of the available
devices.

COMMANDS

Once started, ao-dbg connects to the cc1111 and then reads and executes commands, either
from stdin, or the nework connection to sdcdb.

Unlike the command line, ao-dbg contains built-in help for each of these commands, via the
'help' command. Most of the commands are available in a long form and a single character
short form. Below, the short form follows the long form after a comma.

help, ? {command}
Without arguments, prints a list of available commands. With an argument prints
more detail about the specific command

quit, q
Terminates the application, without changing the state of the target processor.

di [start] [end]
Dumps imem (256 bytes of "internal" memory) from start to end (inclusive).

ds [start] [end]
Dumps sprs from start to end (inclusive). Note that while most sprs are visible in
the global address space, some are not, so use this command instead of "dx" to read
them.

dx [start] [end]
Dump external (global) memory from start to end (inclusive).

set, t <prefix> [start] {data ...}
Store to the memory space specified by prefix where prefix is one of "xram", "rom",
"iram", or "sfr". Store bytes starting at start.

dump, d <prefix> [start] [end]
Dump from the memory space specified by prefix, where prefix is one of "xram",
"rom", "iram" or "sfr". Dumps from start to end (inclusive).

file [filename]
Specifies an intel-format hex file (ihx) that contains the contents of the rom area
loaded into the cc1111. This is used to respond to requests to dump rom memory
contents without getting them from the cc1111 (which is slow).

pc, p {address}
If the address argument is given, this sets the program counter to the specified
value. Otherwise, the current program counter value is displayed.

break, b [address]
Sets a breakpoint at the specified address. This uses the built-in hardware
breakpoint support in the cc1111. As a result, it supports no more than four
breakpoints at once. You must therefore use a modified version of sdcdb which
changes how program execution is controlled to work within this limit.

clear, c [address]
Clear a breakpoint from the specified address.

run, r, go, g {start} {stop}
Resumes execution of the program. If the start argument is present, then it begins
at that address, otherwise it continues running at the current pc. If a stop
argument is present, then a temporary breakpoint is set at that address. This
temporary breakpoint will be removed when execution hits it.

next, n
Step one instruction. In the original s51 program this would ignore subroutines,
but as sdcdb doesn't require this functionality, it's not available here.

step, s
Step one instruction.

load, l [filename]
This is not implemented, but it is supposed to load a hex file into flash. Use the
ccload program instead.

halt, h
Halt the processor. This is the only command which can be sent while the program is
running. It is ignored at other times.

reset, res
Reset the processor. This pulls the reset pin low and re-enables debug mode. Check
the cc1111 documentation to see precisely what this does.

status This dumps the cc1111 debug status register.

info, i breakpoints, b
List the current breakpoints.

info, i help, ?
List the things you can get info on.

stop This doesn't do anything and is present only to retain compatibility with the
original 8051 emulator.

BOARD BRINGUP DEBUGGING

While the original purpose for this program was to connect the source debugger with the
hardware, it can also be used as a low-level hex debugger all on its own. In particular,
all of the cc1111 peripherals can be manipulated directly from the ao-dbg command line.

Starting ao-dbg
First ensure that the target cc1111 device and intermediate cp2103 or cc111 board
are all hooked up correctly.

$ ao-dbg
Welcome to the non-simulated processor
> status
CPU halted
Halted by debug command
>

Turning on LEDs
Two of the cc1111 GPIO pins, P1_0 and P1_1 are capable of driving external LEDs. To
control these, set the Port 1 direction bits to make these output pins and then
change the Port 1 data to set them high or low:

> set sfr 0xfe 0x02 # set P1DIR to 0x2
> set sfr 0x90 0x02 # set P1_1 to high
> set sfr 0x90 0x00 # set P1_1 to low

Reading the A/D converters
The six A/D converter inputs can each be connected to any of the P0 pins, ground,
the A/D voltage refernece, an internal temperature sensor or VDD/3. To read one of
these values, select an A/D converter to use then start the conversion process. The
cc1111 manual has the table for selecting the input on page 144.

To configure one of the P0 pins for use by the A/D unit, we program the ADCCFG
register, setting the bits in that which match the pins desired:

> set sfr 0xf2 0x3f # enable all 6 A/D inputs

To trigger a single conversion, we ask the A/D unit to perform an 'extra'
conversion, which means to do a single conversion not a whole sequence of
conversions. This is controlled by the ADCCON3 register at 0xB6:

> set sfr 0xb6 0xb2 # sample P0_2 using 12 bits of precision
> ds 0xba 0xbb # dump the ADC data low and high regs
> set sfr 0xb6 0xbe # sample internal temperature sensor
> ds 0xba 0xbb # dump the ADC data low and high regs

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