DT Instant Interrupt and Bootloader

[pedja089]

You must disable int before entering bootloader. And to exit from bootloader just execute @ RESET, and you are back on ORG 0, and your main program will setup interrupts again, same way as it setup when device is power on.
Just keep in mind that you have some data in RAM from bootloader, so putting CLEAR in your main program is good idea.

[mikebar]

Hi pedja089,
I did the whole process EXACTLY as you described.
The things I've missed was to disable the interrupt before go to the bootloader.
Probably, the reason why I did not disabled it, is because I thought that since the "@ goto xxxx" happen BEFORE any "@ INT_ENABLE TMR1_INT", this was enough to avoid the interrupt handler.
Seems that is needed to call "@ INT_DISABLE TMR1_INT" even if is not specifically enabled before. Doing that... IT WORKS!
Thank you.

So, here is the trick:

     READ 836,x
     if x = 1 then      'There is a firmware update available
        SEROUT2 PORTD.4,6,[13,10,"Update process start...",13,10]
@ INT_DISABLE TMR1_INT
@ INT_DISABLE RX_INT
        INTCON.7 = 0    'Disable Global Interrupt
        INTCON.6 = 0
        PIE1.5 = 0      'Disable USART RX Interrupt
        T1CON.0 = 0     'Disable Timer1
@ goto 0x17680          'This is where my bootloader start
     endif

Thank you again for the suggestions.

[pedja089]

I'm glad that I could help.
Also keep in mind that when you enter bootloader your registers are not in reset state. So I always disable interrupt and timers in bootloader.