Hi,
have a look at
https://sourceforge.net/p/sdcc/code/HEAD/tree/trunk/sdcc/sim/ucsim/example/simif.c
They use
#define SIF_ADDRESS_SPACE_NAME "xram"
#define SIF_ADDRESS_SPACE __xdata
#define SIF_ADDRESS 0xffff
unsigned char SIF_ADDRESS_SPACE * volatile sif;
and read multi-byte values by repeatedly reading *sif:
void
get_commands(void)
{
int i;
*sif= SIFCM_COMMANDS;
nuof_commands= *sif;
for (i= 0; i < nuof_commands; i++)
commands[i]= *sif;
}
Hope that helps
Raphael
Am Fr., 22. Mai 2020 um 00:37 Uhr schrieb Basil Hussain <ba...@stasisleak.uk
>:
> Hi all,
>
> I'm trying to understand how to use the μCsim simulator interface - the
> interface between the program running within the simulator, and the
> simulator itself. My aim is to have the program that's running in the
> sim measure the execution time (i.e. no. of cycles) of some of it's own
> code.
>
> As far as I understand, you configure it by specifying a certain memory
> location (not one which is used by the chip being simulated!) which
> provides a single-byte 'register' of sorts through which your running
> program can communicate with the simulator. I have that working, by
> specifying command-line args of "-I if=rom[0x5800]" (I chose an address
> just after the peripheral registers, in what is otherwise 'reserved'
> address space). Then if I attempt, from within my running program, to
> use the 'detect' command by writing the value 0x5F to that address, and
> then read back, I successfully get the '!' response character. Similarly
> I can read the interface version successfully (returns 0x01).
>
> One thing I do not understand how to do, and the documentation does not
> reveal, is how to read the simulator's configuration information. When
> you (in the simulator console) issue the command "info hw simif", in
> addition to the simif command summary, it shows:
>
> Configuration memory of simif
> 0x00 00000001 . Turn simif on/off (bool, RW)
> 0x01 00000000 . WR: sets running state, RD: check if simulation is running
> 0x02 00000000 . WR: start simulation, RD: true if running
> 0x03 00000001 . WR: stop simulation, RD: true if stopped
> 0x04 00000000 . Quit simulator (any, WO)
> 0x05 0000006e n Reason of last stop (int, RO)
> 0x06 007a1200 . Xtal frequency in Hz (int, RW)
> 0x07 000a7db0 . Nuof ticks simulated so far (int, RO)
> 0x08 00000000 . Ticks spent in ISR (int, RO)
> 0x09 00000000 . Ticks spent in idle state (int, RO)
> 0x0a 00000055 U Real time since reset in msec (int, RO)
> 0x0b 00151ae2 . Nuof simulated virtual clocks (int, RO)
> 0x0c 000098e2 . PC register (int, RW)
> 0x0d 00000000 . Print char on stdout (int, WO)
> 0x0e 00000000 . Write char to simif output (int, WO)
> 0x0f 00000000 . Not used
>
> How is one meant to read/write this data? I thought perhaps you write
> the first byte to the simif memory location, then read 4 bytes back with
> the value? But when I tried this to get, for example, the PC, I don't
> read anything that looks like the correct data. I tried it two ways:
>
> #define UCSIM_IF (*(volatile uint8_t *)(0x5800))
>
> /* doesn't work, pc = 0xF3000000 */
> UCSIM_IF = 0x0C;
> uint32_t pc = (*(volatile uint32_t *)(&UCSIM_IF));
>
> /* also doesn't work, pc = 0xF3F3F3F3 */
> union {
> uint32_t val;
> uint8_t raw[4];
> } pc;
> UCSIM_IF = 0x0C;
> pc.raw[0] = UCSIM_IF;
> pc.raw[1] = UCSIM_IF;
> pc.raw[2] = UCSIM_IF;
> pc.raw[3] = UCSIM_IF;
>
> Can anyone tell me how I am supposed to read the simif configuration
> values?
>
> Regards,
> Basil Hussain
>
>
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> Sdcc-user@lists.sourceforge.net
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>
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