Lpc2000

Thank you...this is exactly what I was looking for!

In my application, the CPU is deeply embedded and is
not accessible so it cannot be reset or power cycled.
To prevent a situation where the device gets accidentally
stuck in the ISP software, I would like to resume normal
execution if the ISP software is not used for say 5 minutes.
If I set the watchdog to ~5 minutes before launching the ISP, 
will the ISP code kick it (and thus never exit) or will it 
allow the watchdog to timeout and reset the node 5 minutes 
later?

--- In lpc2000@yahoogroups.com, "Richard" <richas@y...> wrote:
> 
> Here is some code that will invoke the bootloader which will read 
> P0.14 (after you have set it low) and initiate ISP.
> 
> Richard
> 
> /* ISP Invocation code – Richard Soennichsen - Philips 
> Semiconductors  */
> /* 								
> 	10/11/2004						
> 							*/
> 
> /* define the SFR addresses, this may already be handled in a header 
> file */
> 
> #define MEMMAP   (*((volatile unsigned int *) 0xE01FC040))
> #define IODIR0   (*((volatile unsigned int *) 0xE0028008))
> #define IOCLR0   (*((volatile unsigned int *) 0xE002800C))
> #define PINSEL0  (*((volatile unsigned int *) 0xE002C000))
> #define VPBDIV   (*((volatile unsigned int *) 0xE01FC100))
> #define PLLCON   (*((volatile unsigned int *) 0xE01FC080))
> #define PLLFEED  (*((volatile unsigned int *) 0xE01FC08C))
> 
> 
> void (*bootloader_entry)(void);  /* Declare the entry function  */
> unsigned long temp;					/*Temporary 
> variable    */
> 
> void init(void)
>   {
> temp = PINSEL0;              /* Connect RxD0 & TxD0 pins to GPIO */
> PINSEL0 = temp & 0xFFFFFFF3;
> 
> /* Select P0.14 as an output and P0.1 as an input */
> /* P0.1 is sampled to determine baud rate             */
> temp = IODIR0; 
> temp = temp | 0x4000;
> temp = temp & 0xFFFFFFFD;
> IODIR0 = temp;
> 
> IOCLR0 = 0x4000;    	/* Clear P0.14 */  
> 
> /*
>    Disconnect PLL if you want to do ISP at crystal frequency.
>    Otherwise you need to pass the PLL freq when bootloader goes in
>    ISP mode. 
>    cclk = crystal when PLL is disconnected 
>    cclk = PLL freq when PLL is connected.
> 
>    Disconnecting the PLL is recommended. 
> 
>    *pllcon = 0x0;				/ disconnect the PLL
> 	*/
>    *pllfeed = 0xAA;
>    *pllfeed = 0x55;
> */
> 
> /*
>    Set the VPB divider to 1/4 if you application changes the VPBDIV 
> value.
>    The bootloader is hard-coded to use the reset value of VPBDIV 
> register
>    *vpbdiv = 0x0;
> */
> 
> /* Map bootloader vectors */
>    MEMMAP = 0x0;
> 
> /* Point to bootloader entry point i.e. reset vector 0x0 */
> 
>    bootloader_entry = (void (*)(void))(0x0);
> }
> /*
>    Invoke the bootloader
>    The bootloader will read pin P0.14 to detect if ISP is forced
>    Since P0.14 is configured as an output and set to 0, the 
> bootloader
>    will go in ISP mode.
> */
> int main(void)
>   {
>     init();
> 	bootloader_entry();
>   }
> 
> 
> 
> 
> 
> 
> 
> --- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
> > Yup There shore is !
> > 
> > In the LPC2106 anyway. I dunno about the rest of them. But it 
> requrires a reset of the micro!
> > 
> > Use the IAP instructions to erase the first block of flash memory.
> > 
> > Drop the supply and bring it up again, and the chip detects the 
> lost of a valid program 
> > and automatically jumps to the ISP.
> > 
> > I use this to update the firmware with P0.14 buried deep in a hunk 
> of expoxy, but watch it,
> > Once the ISP is running anyone can steal your program !! I use a 
> very unlikely pass code in the operating firmware to do this.
> > 
> > Owen Mooney
> > 
> > Subject: 
> > 
> > 
> > Is there any way to launch the ISP software without having the BSL
> > jumper on?  (i.e. does it have an entry point that does not check 
> P0.14?)