Hi,
Oh I didnt look at it from the C angle. Thanks for the reply.
I had one more doubt:
I have made changes to the PowerCycleP.nc file and add that variable as
extern in my app code, My app uses DefaultLpl that calls the PowerCycleP
module. I thought it may not be calling properly, So I inserted the same
time functionality in DefaultLpl module. But, when I do the make I get the
same error for both the modules:
mkdir -p build/telosb
compiling CommAppC to a telosb binary
ncc -o build/telosb/main.exe -Os -O -mdisable-hwmul -Wall -Wshadow
-Wnesc-all -
target=telosb -fnesc-cfile=build/telosb/app.c -board=
-DDEFINED_TOS_AM_GROUP=0x2
2 "-DCC2420_DEF_RFPOWER=7" -DIDENT_APPNAME=\"CommAppC\"
-DIDENT_USERNAME=\"Srini
vas\" -DIDENT_HOSTNAME=\"Srinivas-PC\" -DIDENT_USERHASH=0x36fc963bL
-DIDENT_TIME
STAMP=0x4b32a109L -DIDENT_UIDHASH=0xc87f05aaL CommAppC.nc -lm
/opt/tinyos-2.x/tos/chips/cc2420/lpl/DefaultLplC.nc:39:2: warning: #warning
"***
USING DEFAULT LOW POWER COMMUNICATIONS ***"
/opt/tinyos-2.x/tos/chips/cc2420/lpl/DefaultLplP.nc:79: warning: non-atomic
acce
sses to shared variable `over':
/opt/tinyos-2.x/tos/chips/cc2420/lpl/DefaultLplP.nc:477: warning:
non-atomic w
rite
/Local/Temp/ccIG7otV.o: In function `CommC$Rec
eive$receive':
app.c:(.text+0x40cc): undefined reference to `CommC$over'
app.c:(.text+0x40d6): undefined reference to `CommC$stop_time'
app.c:(.text+0x40da): undefined reference to `CommC$stop_time'
app.c:(.text+0x40e2): undefined reference to `CommC$start_time'
app.c:(.text+0x40e6): undefined reference to `CommC$start_time'
make: *** [exe0] Error 1
Is there something I should do to include the extern variables in my app
code. Add some env variable maybe to tell the compiler the exact location of
its definition and initialization.
Sorry but I am new to tinyOS and extern.
Thanks,
Srinivas
On Wed, Dec 23, 2009 at 12:24 AM, Arik Sapojnik <[email protected]> wrote:
> The problem is a C problem - you have to declare a variable - *rcvpkt *in
> the beginning of a scope.
> Rewrite as follows:
>
> .....
> if (len == sizeof(Msg)) {
>
> Msg* rcvpkt = (Msg*)payload; <- First
>
>
> local_time = ((stop_time * over) - start_time);
>
> ..........
>
>
>
>
> On Tue, Dec 22, 2009 at 21:07, Srinivas Hegde
> <[email protected]>wrote:
>
>> Hi,
>> I have written a code that gets the local time at start and stop of each
>> radio period in MSp430PowerCycleP.nc. I would like to use these variables in
>> my application code to find the actual ON time of the radio. But, the extern
>> gives me error
>>
>> implementation {
>>
>> extern uint32_t stop_time;
>> extern uint32_t start_time;
>> extern uint8_t over;
>> uint32_t local_time[2];
>>
>> .......
>>
>> event message_t* Receive.receive(message_t* msg, void* payload, uint8_t
>> len) {
>>
>> call Leds.led2Toggle();
>>
>> if (len == sizeof(Msg)) {
>> local_time = ((stop_time * over) - start_time);
>>
>> Msg* rcvpkt = (Msg*)payload; <--- Line no 127
>>
>> ..........
>>
>> I am getting the following error:
>> In component `CommC':
>> CommC.nc: In function `Receive.receive':
>> CommC.nc:127: syntax error before `*'
>> CommC.nc:131: `srlpkt' undeclared (first use in this function)
>> CommC.nc:131: (Each undeclared identifier is reported only once
>> CommC.nc:131: for each function it appears in.)
>> CommC.nc:131: `rcvpkt' undeclared (first use in this function)
>>
>> The code works fine if I remove the following line:
>> local_time = ((stop_time * over) - start_time);
>>
>> I think there is some error in the extern variables usage. Can you please
>> help me with that.
>>
>> Thanks,
>> Srinivas Hegde
>>
>> _______________________________________________
>> Tinyos-help mailing list
>> [email protected]
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>
>
>
> --
> Best Regards,
> Arik Sapojnik
> [email protected]
>
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