Discussion in "Project Help" started by    scorcho    Oct 19, 2006.
Thu Oct 19 2006, 03:32 AM

I have a multi-file project and in main.c I have a global array to store a string of characters. In my main function I call function i2c_send from another file(i2c.c) that sends this string over i2c. Naturally, my i2c isr is in i2c.c, and naturally it needs to write the string into the i2c buffer for the transmission to begin. Since I can't pass the string into the isr as a parameter, the string within i2c has to be a global. Short of doing a strcpy in my i2c_send function, what can I do to let my isr refer to the string in main.c and copy that into the i2c buffer?
Thu Oct 19 2006, 06:00 PM
simple make use of keyword "extern"
example:like you have a char variable in a file name file.c and u want to access it main.c

char a; //as defined in file.c

so in main.c you have to access it as

extern char a; //used in main.c

now for an array to access

char a[10]; //as defined in file.c

extern char a[10]; //used in main.c

i hope you understood.

Get Social


Powered by e107 Forum System


Sat May 15 2021, 11:47 AM
Derek Wolcott
Geometric Energy Corporation announced the dogecoin-funded mission on Sunday, with DOGE-1 representing a 40 kilogram cube satellite flying as a payload on a Falcon 9 rocket.
Thu May 13 2021, 07:18 PM
Pretty section of content. I just stumbled upon your weblog and in accession capital to assert that I get actually enjoyed account your blog posts. Any way I will be subscribing to your augment and even I achievement you access consistently quickly. https://mkfinstitute.com Trisha Trisha
Wed May 12 2021, 01:23 PM
Jed Roan
Now you can promote your site all over the internet for FREE: http://www3.listofsitesthatacceptfreeads.club
Wed May 12 2021, 08:20 AM
If some one wants to be updated with most recent technologies afterward he must be visit this web page and be up to date every day. annual credit report https://creditscoresetf.com
Wed May 12 2021, 06:11 AM
Great website. A lot of useful information here. I'm sending it to some pals ans also sharing in delicious. And of course, thanks on your effort! annual credit report https://creditscorecheckn.com



Thu Jun 25 2020, 03:46 PM
Mon Jun 22 2020, 03:03 PM
Tue Jun 16 2020, 05:10 PM
Sat Jun 13 2020, 09:43 PM
Thu May 21 2020, 12:44 PM
Thu May 21 2020, 01:28 AM
Wed May 20 2020, 07:05 PM
Wed May 20 2020, 11:52 AM


Guests: 110, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 38215
Newest member: Mirza123