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| 18F452 with CCS Bootloader Problem (Yes I Have searched!) |
 Posted: Tue Oct 23, 2007 6:39 pm |
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I have a question which seems to come up often. I have searched through the forum and I believe I am running into a memory mapping problem. I am using the default CCS bootloader that is included. I then try to load the file testprogram.c using Siow and I run into a Timeout Error when i select Download Software and attempt to send the hex file. I read through other posts that the problem could be where the application is being written and it may be being overwritten. I did not understand the exact problem and was hoping someone could explain it to me in a non-technical standpoint. I would appreciate it greatly!
I have used the test program, without the bootloader and it works great. I am also able to send/receive information over the RS-232 link.
I am using the standard bootloader.h and loader.c, unchanged.
Thanks in advance for the help, as always!
Here is the bootloader.c I am using (Same as CCS'):
| Code: |
///////////////////////////////////////////////////////////////////////////
//// EX_BOOTLOADER.C ////
//// ////
//// This program is an example stand alone bootloader. ////
//// ////
//// This program must be loaded into a target chip using a device ////
//// programmer. Afterwards this program may be used to load new ////
//// versions of the application program. ////
//// ////
//// This bootloader is designed to detect pin B5 low on reset. It ////
//// will then use the RS232 link to download a new program. ////
//// Otherwise the application program is started. ////
//// ////
//// Use an RS232 link and the SIOW.EXE program to load a new HEX ////
//// file into the target chip. ////
//// ////
//// This example will work with the PCM and PCH compilers. The ////
//// following conditional compilation lines are used to include a ////
//// valid device for each compiler. Change the device, clock and ////
//// RS232 pins for your hardware if needed. ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2004 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#define _bootloader
#include <bootloader.h>
#include <loader.c>
#org LOADER_END+2,LOADER_END+20
void application(void) {
while(TRUE);
}
#org 0x40,0x7F
void main(void) {
if(!input(PIN_B5))
{
load_program();
}
application();
}
#ORG default
#int_global
void isr(void) {
jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));
}
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I am using the standard bootloader.h and loader.c, unchanged.
Here is my testprogram.c:
| Code: |
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8)
#include <bootloader.h>
void main(void) {
int i=0;
for(i=0;i<5;i++) {
output_high(PIN_B0);
delay_ms(500);
output_low(PIN_B0);
delay_ms(500);
}
i = 0;
printf("\r\n-------------------------------- \r\n");
printf("\r\n- Serial Communications Test - \r\n");
printf("\r\n-------------------------------- \r\n");
while(TRUE) {
printf("%u \r\n",++i);
delay_ms(1000);
}
}
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scaven92
Joined: 06 Oct 2006
Posts: 44
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