start_boot.h File Reference

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Defines

#define GOTOBOOTKEY   0x55AAAA55

Functions

void start_boot (void)
void start_boot_if_required (void)
void goto_boot (void)

Variables

__no_init U32 boot_key


Detailed Description

This file contains the routines to jump in ISP mode - Compiler: IAR EWAVR and GNU GCC for AVR

Definition in file start_boot.h.


Define Documentation

#define GOTOBOOTKEY   0x55AAAA55

Definition at line 47 of file start_boot.h.

Referenced by start_boot_if_required().


Function Documentation

void start_boot ( void   ) 

This function will start the on-chip bootloader after a watchdog timer reset.

The function set a special key in sram (uninitialized during mcu start-up execution) and performs a mcu watchdog timer reset. This function should be called when a special eve,t is detected in the application that requires the bootloader activation. When this function is used, be sure to implement the "start_boot_if_required()" function at the begining of main().

Definition at line 82 of file start_boot.c.

References boot_key, wdtdrv_enable(), and WDTO_500MS.

00083 {
00084    boot_key=0x55AAAA55;
00085    
00086    // Enable the WDT for reset mode
00087    wdtdrv_enable(WDTO_500MS);
00088    while(1);
00089 }

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void start_boot_if_required ( void   ) 

This function calls the on-chip bootloader.

The function starts the on-chip bootloader if the application has posted such a request. This function sould be inserted at the begining of the main function.

Jumping to bootloader

Definition at line 97 of file start_boot.c.

References boot_key, and GOTOBOOTKEY.

00098 {
00099   if(boot_key==GOTOBOOTKEY)
00100   {
00101       boot_key = 0;
00102       (*start_bootloader)();           
00103   }
00104 }

void goto_boot ( void   ) 

This function jump to on-chip bootloader without CPU reset.

Jumping to bootloader

Definition at line 109 of file start_boot.c.

00110 {
00111    (*start_bootloader)();              
00112 }


Variable Documentation

__no_init U32 boot_key

Referenced by start_boot(), and start_boot_if_required().


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