What is "reload program" ?
Reset ? Re-flash ?

What is "RUN" ?




rchadwic wrote 2011-03-12 15:41:
> I am trying to learn how to use the C18  V3 . 36  compiler to program an
> 18F4550. Using PicKit3 and MPLab  V8 . 46 .
> I am trying to use the hardware USART functions to load a single characte=
r
> into the PIC and echo it back, repeating the character 30 times in a WHIL=
E
> loop.
> The program is shown below. I am trying to declare constant hwi =3D 30. I=
 have
> tried many ways of locating this, none are successful.
> With the statement located at POSITION A, it does the WHILE loop once; to
> repeat requires reloading the program. I am expecting the program to repe=
at
> each time I push RUN; it doesn't.
> With the statement located at POSITION B, I get an  OUT OF RANGE  indicat=
ion
> on the Watch window. A count of 30 was expected. Repeat requires reloadin=
g
> the program.
> With the statement located at POSITION C, it will not compile and I get a
> syntax error that has not responded to typing error checks, research, and
> checks of the preceding line of code.
> The MPLAB supplied usart . c routine complies and runs correctly.
> I am doing something stupid that I cannot see. Can someone help me?
>
> My first thought regarding asking for help was the Microchip C18 forum.
> However, I can not post this to that forum as I keep getting a message th=
at
> tells me I am using
> "potentially harmful characters" A query to the forum yielded some
> suggestions but no matter how I parse the post it fails.
>
> /**********************************************************************
> /*This program loads an ascii "W" character into the PIC and repeats it 3=
0
> times. */
> /*uses A CHARACTER*/
> /* ADDITIONAL NOTES:
> /* Code uses the Peripheral support library available with MCC18 Compiler
> /* Code Tested on:
> /* Olimex demo board with 18F4550 processor
> /* The microcontroller uses an External Crystal (20 MHz).
> /*
> /* Uses TX pin for transmission and RX pin for reception.
> /* Baud rate of 9600 is configured for 20MHz oscillator frequency
> //**********************************************************************/
>
> #define USE_OR_MASKS
> #include<p18f4550.h>
> #include<usart.h>
> #include<delays.h>
> //-------------------------------Configuration setting
> ----------------------------------------------
>
> #pragma config FOSC=3D HS, PLLDIV =3D 5, FCMEN=3DON, WDT=3DOFF, IESO=3DOF=
F, XINST=3DOFF,
> LVP=3DOFF
>
>
> char Txdata =3D 'W';
> int hwi=3D30;	//POSITION A	Loads OK, counts down and stops at 0 in
> location 06B. Must //reload program to start again.
>
> #define BAUD_RATE_GEN 31      // Fosc =3D 20 MHz, Baud Rate =3D 9600 bps
>
> void main(void)
> {
>
> //int hwi=3D30;	 //POSITION B "Out of Scope" value shows on Watch window;
> counts loops 30 //times and stops at 0 at address 201.Must reload program=
 to
> start again.
>
>      OpenUSART(USART_TX_INT_OFF | USART_RX_INT_OFF | USART_ASYNCH_MODE |
> USART_EIGHT_BIT | USART_CONT_RX | USART_BRGH_LOW, BAUD_RATE_GEN);
>      baudUSART(BAUD_8_BIT_RATE | BAUD_AUTO_OFF);
>
>
> //int hwi =3D 30;		//POSITION C  Syntax Error that responds to nothing
> I change (yet)=09
>
> while(hwi>0)
> =09
> {
>   	WriteUSART(Txdata);     // transmit the character
> 	Delay10KTCYx (0);		//Delay about half a second
> 	hwi--;
>   }
>
> CloseUSART();
> while (1);					// end of program
>
> }
>
>
>
--=20
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