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dorinjj
Joined: 21 Jan 2011
Posts: 5
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| stdlib.h problem? |
 Posted: Fri Jan 21, 2011 7:33 pm |
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Hi, I'm new in c programming of pic mcu's and a new member of this forum, but in the process of c learning, I think that I discovered a problem with the "stdlib.h" library when is used with "#device ADC=10" directive.
I can't compile my code when I try to include "stdlib.h" library for use "itoa()" function when I have "#device ADC=10" directive and the error messages are:
*** Error 23 "led_test.c" Line 3(8,9): Can not change device type this far into the code
*** Error 48 "led_test.c" Line 3(9,12): Expecting a (
*** Error 43 "led_test.c" Line 3(13,15): Expecting a declaration
3 Errors, 0 Warnings.
The device which I use is PIC16F887.
What is the problem? Thank You.
| Code: |
#include <16F887.H>
//#include <stdlib.h> // problem!? I can't use this *
#device ADC=10 // ? *
#fuses INTRC_IO, NOMCLR, NOWDT
#use delay(clock=8M)
#use rs232(uart1, baud=9600, parity=N)
void main()
{ setup_oscillator(OSC_8MHZ);
set_tris_d(0x00);
int16 r,var;
setup_adc_ports(sAN0);
setup_adc(ADC_CLOCK_DIV_8);
set_adc_channel(0);
while(1)
{
r =read_adc();
output_d(r);
printf("AD value is %4LD \r\n", r);
delay_ms(1000);
}
}
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dyeatman
Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK
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| Posted: Fri Jan 21, 2011 7:42 pm |
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Swap the second and third lines. The device declarations must always come first
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dorinjj
Joined: 21 Jan 2011
Posts: 5
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| Posted: Fri Jan 21, 2011 8:03 pm |
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Thank You for reply. 
Problem solved. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Sat Jan 22, 2011 3:16 am |
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I'd actually say, to avoid future problems, put the include down after _all_ the initialisation stuff. So:
1) Processor define/include
2) Any extra 'device' statements
3) Fuses and clock statements
4) device configuration (#use RS232/I2C etc.)
5) Include other stuff & defines
6) main code.
Problem is that if any included file uses RS232, or timings, it really needs to come after the clock setups, and RS232 declarations. Think of 1 to 4, as the 'header', that must be there before other code is loaded.
You can twiddle the order a little, _but_ in general, this is the safest layout to use, and is quite logical.
Best Wishes |
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