Post by thread:[pic]: c code pointer test code

Hi to all engineers, I am worked on simple c code to test pointer I am not sure why it doesn't work // pointer test void pointer_test(void){ unsigned char c; unsigned char index; unsigned char const PATTERN[]={1,2,4,8,16,32,64,128}; index=0; for(c=8;c!=0;c--) { PORTB=PATTERN[index]; index++; } } I am sure if this is how I suppose to use pointer In hi-tech. any help will appreciate Andre -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

{Quote hidden}> -----Original Message----- > From: Andre Abelian [SMTP:spam_OUTengelecTakeThisOuTEARTHLINK.NET] > Sent: Thursday, February 27, 2003 12:40 AM > To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU > Subject: [pic]: c code pointer test code > > Hi to all engineers, > > I am worked on simple c code to test pointer > I am not sure why it doesn't work > > // pointer test > void pointer_test(void){ > unsigned char c; > unsigned char index; > unsigned char const PATTERN[]={1,2,4,8,16,32,64,128}; > index=0; > for(c=8;c!=0;c--) > { > PORTB=PATTERN[index]; > index++; > } > } > > I am sure if this is how I suppose to use pointer > In hi-tech. any help will appreciate > > > Andre > This looks OK, compiles OK and works fine in the MPLAB simulator, what is the actual problem you are seeing? Are you initialising TRISB as outputs? Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to postmasterKILLspambookham.com. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> -----Original Message----- > From: pic microcontroller discussion list > [.....PICLISTKILLspam.....MITVMA.MIT.EDU] On Behalf Of Andre Abelian > Sent: Wednesday, February 26, 2003 4:40 PM > To: EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU > Subject: [pic]: c code pointer test code > > > Hi to all engineers, > > I am worked on simple c code to test pointer > I am not sure why it doesn't work > > // pointer test > void pointer_test(void){ > unsigned char c; > unsigned char index; > unsigned char const PATTERN[]={1,2,4,8,16,32,64,128}; > index=0; > for(c=8;c!=0;c--) > { > PORTB=PATTERN[index]; > index++; > } > } > > I am sure if this is how I suppose to use pointer > In hi-tech. any help will appreciate > > > Andre > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads {Quote hidden}> -----Original Message----- > From: John Dammeyer [SMTP:johndspam_OUTAUTOARTISANS.COM] > Sent: Thursday, February 27, 2003 12:51 AM > To: @spam@PICLISTKILLspamMITVMA.MIT.EDU > Subject: Re: [pic]: c code pointer test code > > Hi, > > Arrays in C start at 0 and go to size-1. > > You'd be better off writing the loop like this. > > for(c=0; c<8; c++) { > PORTB=PATTERN[c]; > } > > John Dammeyer > John, I took one look at the code and started writing the same reply, but if you look again he's not using the loop counter to index the array, there is a separate variable used for this and the code works perfectly. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to KILLspampostmasterKILLspambookham.com. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics