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ritchie
Joined: 13 Sep 2003
Posts: 87
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| CCS Bootloader help |
 Posted: Sun Mar 06, 2005 8:36 am |
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I've use the CCS Bootloader included with my compiler version 3.188
Ive modified the code from the original ex_bootloader.c
| Code: |
if(!input(PIN_B4))
load_program();
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to
| Code: |
if(!input(PIN_B0)){
output_low(PIN_A0);
load_program();
disable_interrupts(GLOBAL);
delay_ms(250);
FSR0H = 0x00;
PIR1 = 0x00;
PIR2 = 0x00;
TMR2 = 0x00;
T2CON = 0x00;
PIE1 = 0x00;
PR2 = 0xFF;
STATUS = 0x00;
TMR0H = 0x00;
TMR0L = 0x00;
T0CON = 0xFF;
INTCON = 0x00;
INTCON2 = 0xFF;
INTCON3 = 0xC0;
T1CON = 0x00;
TMR1L = 0x00;
TMR1H = 0x00;
SPBRG = 0x00;
TXSTA = 0x02;
RCSTA = 0x00;
TXREG = 0x00;
RCREG = 0x00;
#asm reset #endasm
}
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My problem really is that my test code won't work... here's a pick of my test program..
| Code: |
#include <18F452.H> // Target PIC Microcontroller IC
#device *=16 // use a 16-bit pointer
#fuses HS,NOPROTECT,NOWDT,NOLVP // PIC MCU Configuration
#use delay(clock=20000000) // 20MHz Crystal clock speed
#use rs232(baud=115200, xmit=PIN_C6, rcv=PIN_C7, enable=PIN_A1, parity=N, bits=8, errors)
#include <bootloader.h>
#include <LCD.C>
main()
{
int count=0;
delay_ms(2000);
lcd_init();
delay_ms(100);
setup_adc_ports(NO_ANALOGS);
printf(lcd_putc,"1234567890123456");
printf(lcd_putc,"\nABCDEFGHIJKLMNOP");
while (TRUE)
{
output_high(PIN_C1);
output_low(PIN_A0);
output_low(PIN_A2);
delay_ms(2000);
output_low(PIN_C1);
output_high(PIN_A0);
output_high(PIN_A2);
delay_ms(2000);
printf("\r\nThis is an RS485 Communication Test %03U",count);
count++;
}
}
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I made a test case.
test case 1:
I remove all LCD related code stuff (remove printf, count, lcd_init) and the program will load successfully.
but for test case 2:
I include all the code mention above but this is where the problem occurs, after bootloading the test code won't work.
I also try to use the internal eeprom to save a marker such that after software reset it will read the internal eeprom and check if it needs to bootload a new firmware.
I can't be successfull using the internal eeprom.
Anybody can help me on this... I need your comments and suggestions.
Thank you. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 06, 2005 11:16 am |
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If you make changes to code and then it doesn't work, then:
1. Comment out all your changes. Re-compile and see if the
program starts working again. (If it still doesn't work, then
start over with a clean copy of the original, working program.
Add your changes, but keep them commented out.)
2. Start to un-comment your changes a few lines at a time.
(Try to choose lines of code that are logically related, when you
do the un-commenting). Re-compile each time. At some
point, the code will start to fail.
3. Now work on just the group of lines that caused the failure.
Comment them out, one at a time. At one particular line,
the program will start working. Study this line. Read the
data sheet. Think in your mind about what peripherals or
i/o pins, or interrupts this line of code might affect. When
you do this, you will have found the problem.
This type of trouble-shooting procedure might not work in every case,
but it's a good place to start. |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Sun Mar 06, 2005 5:13 pm |
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The bootloader example in v3.188 contains a bug.
In loader.c change: | Code: | erase_program_eeprom(addr);
#endif |
to: | Code: | erase_program_eeprom(addr);
next_addr = addr + 1;
#endif |
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