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pilar
Joined: 30 Jan 2008
Posts: 197
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kthomas
Joined: 06 Jul 2010
Posts: 5
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 Posted: Wed Jul 07, 2010 5:55 pm |
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I'm not familiar with that bootloader, but I've used the following to locate a bootloader at the top of memory on a dsPIC, with the application below. In this case the bootloader and application are two separate entities.
In the application:
| Code: | #ORG start, end {} // reserves space for the bootloader
#ORG( end+5, getenv("PROGRAM_MEMORY")-1 ) default // puts the code following this from the end of the bootloader thru the end of program memory |
In the bootloader:
| Code: | | #ORG start, end auto=0 default // tells the compiler to put all of the bootloader code in the designated range |
Where start is the beginning of program memory and end is the end of your bootloader. |
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pilar
Joined: 30 Jan 2008
Posts: 197
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| Posted: Fri Jul 09, 2010 10:30 am |
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Hi, I've been using a Bootloader to PIC18F4550 and I just needed to put this code the begin of my code!!!:
| Code: | /********************************************************************************/
/* BootLoader Activo */
/********************************************************************************/
#build(reset=0x800)
#build(interrupt=0x808)
#org 0x0000,0x07ff
void bootloader() {
#asm
nop
#endasm
} |
But now I want to use this new AN1310 Bootloader with a PIC18F452 and I can not understand how to remap the code of my application.
Here is the code of my aplication:
| Code: | #include <p18f452.h>
#pragma config OSC = HS, PWRT = ON, BOR = OFF, BORV = 27,WDT = OFF, STVR = OFF,LVP = OFF
#include <stdio.h>
#include <usart.h>
// BAUDRG is calculated as = Fosc / (4 * Desired Baudrate) - 1
#define BAUDRG 86 // 20MHz
void high_isr(void);
void low_isr (void);
#pragma code AppHighIntVector = 0x0008 // hardware high priority interrupt vector address
void AppHighIntVector(void)
{
_asm GOTO high_isr _endasm // branch to the high_isr() function to handle priority interrupts.
}
#pragma code AppLowIntVector = 0x0018 // hardware low priority interrupt vector address
void low_vector(void)
{
_asm GOTO low_isr _endasm // branch to the low_isr() function to handle priority interrupts.
}
#pragma code // return to the default code section
#pragma interrupt high_isr
void high_isr(void)
{
LATDbits.LATD1 ^= 1; // blink LED
PIR1bits.TMR1IF = 0; // clear Timer 1 interrupt flag
}
#pragma interruptlow low_isr
void low_isr(void)
{
if(PIR1bits.RCIF)
{
#ifdef INVERT_UART
if(RCSTAbits.FERR && PORTCbits.RC7)
#else
if(RCSTAbits.FERR && !PORTCbits.RC7)
#endif
{
// receiving BREAK state, soft reboot into Bootloader mode.
Reset();
}
TXREG = RCREG; // echo received UART character back out
LATD ^= 0xF0;
}
if(INTCONbits.TMR0IF)
{
LATDbits.LATD0 ^= 1; // blink LED
INTCONbits.TMR0IF = 0; // clear Timer 0 interrupt flag
}
}
unsigned int brg;
void main()
{
#ifdef INVERT_UART
LATCbits.LATC6 = 0; // drive TXD pin low for RS-232 IDLE state
#else
LATCbits.LATC6 = 1; // drive TXD pin high for RS-232 IDLE state
#endif
TRISCbits.TRISC6 = 0;
if(!RCONbits.POR)
{
// Power On Reset occurred, bootloader did not capture an autobaud BRG value.
brg = 0;
RCONbits.POR = 1; // flag that future MCLR/soft resets are not POR resets
}
TMR0H = 0;
TMR0L = 0;
T0CON = 0b00010110;
INTCONbits.TMR0IF = 0;
INTCONbits.TMR0IE = 1;
INTCON2bits.TMR0IP = 0;
TMR1H = 0;
TMR1L = 0;
T1CON = 0b00110111;
T1CONbits.TMR1CS = 0; // internal clock source (Fosc/4)
PIR1bits.TMR1IF = 0;
PIE1bits.TMR1IE = 1;
IPR1bits.TMR1IP = 1; // Timer 1 as High Priority interrupt
RCONbits.IPEN = 1; // enable interrupt priority
INTCONbits.GIEH = 1;
INTCONbits.GIEL = 1;
LATD = 0; // turn off LEDs
TRISD = 0; // enable PORTD LED outputs
// wait for stable clock and host connection by waiting for first Timer 0 interrupt
T0CONbits.TMR0ON = 1;
while(!LATDbits.LATD0);
if(brg != 0)
{
printf( (far rom char*) "Bootloader BRG: %u\r\n", brg);
}
printf( (far rom char*) "\r\nHello world from PIC microcontroller!\r\n");
// infinite loop, interrupts will blink PORTD pins and handle UART communications.
while(1)
{
}
} |
someone could give me a hand with this? |
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