CodeWarrior for MCU中的主题 Re: semaphore

semaphore

steph — Wed, 18 Nov 2015 14:45:05 GMT

hello,

i'm using HCS12X with Xgate .

first, i use hc12 core for my main program and xgate core for have SCI communication.

for the semaphore, in my main program :

do{XGSEM=0x0101;}while(!XGSEM);

....

XGSEM=0x0100;

and in the Xgate program i use :

while(!_ssem(0)){}

...

_csem(0);

this program work fine

now, i want to add an I2C function in Xgate core, so in my main program i try to use a 2nd semaphore :

do{XGSEM=0x0202;}while(!XGSEM);

....

XGSEM=0x0200;

and in the Xgate program i use :

while(!_ssem(1)){}

...

_csem(1);

this program work fine

i must have a problem, the 2 communication work fine while 5 or 10 minut but stop after this time.

someone can say me if this declaration of semaphore is correct ?

thanks

Stéphane

Re: semaphore

trytohelp — Thu, 19 Nov 2015 08:55:06 GMT

Hi Stéphane,

Just to have more info regarding the tool used.

Do you use CodeWarrior for HC12 V5.1 ?

or an older version ? which one ?

To do that you must:

Under CodeWarrior IDE (classic)

Start the IDE and click on Help | About Freescale CodeWarrior.

Click on Installed Products

Provide us all info displayed.

Or you can save them in a txt file.

Do you use Osek or Autosar ?

Have a great day,
Pascal
Freescale Technical Support
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Re: semaphore

kef2 — Thu, 19 Nov 2015 17:23:33 GMT

do{XGSEM=0x0101;}while(!XGSEM);

Waiting for any bit set in XGSEM is OK while one semaphore is used in your app. Using more semaphores, you need wait for specific bit in XGSEM. Like this

do{XGSEM=0x0101;}while( !(XGSEM & 0x0001));

or better something like this

#define SCISEMAPHORENO 0

#define I2CSEMAPHORENO 1

do{XGSEM=(0x0101 << SCISEMAPHORENO) ;}while( !(XGSEM & (0x0001 << SCISEMAPHORENO)));

XGSEM= 0x0100 << SCISEMAPHORENO;

do{XGSEM=(0x0101 << I2CSEMAPHORENO) ;}while( !(XGSEM & (0x0001 << I2CSCISEMAPHORENO)));

XGSEM= 0x0100 << I2CSEMAPHORENO;

(This is S12X specific question. I think you would be better asking here https://community.freescale.com/community/16bit)

Regards

Edward

Re: semaphore

steph — Mon, 23 Nov 2015 14:10:31 GMT

OK, thank you for the information and the maniere of proceder by renaming(reappointing) semaphores. Now I have find my error, I had forgotten a variable which had no semaphore. The question that I settled was is that I used well the good syntax:
XGSEM = 0x0101 for SSEM ( 0 ) and XGSM = 0x0202 for SSEM ( 1 )