this work as a NoTouch implementation for the LPC932
This is the NoTouch implementation for the LPC932
execute the following
when the external ISP stimuli (such as a UART string, switch press or whatever)
occur:
mov a,#2
mov r5,#1
mov R7,#3
lcall 0ff00h
Then the program hums
happily till the next power-on-reset after which it is in 'virgin chip boot
mode' i.e. it will expect and accept FlashMagic input.
This can be
automated further by engaging the watchdog after the code above and let it time
out generating the reset. By that, in
combination with a 'unique serial
string activate', you can create a system that requires nothing more
than connect the serial cable and run the PC.
This way a simple Rxd/Txd 232 chip (externally) connected to
the PC is all that is required as opposed to the 'cut the power, bang the
reset' etc that a pure hardware ISP entry require.
It is recommended that, during development, you include the above very early in the code
activated by e.g. TXD held low. This
will allow simple ISP activation when your code has a bug that does not let it
reach the ‘customer activation’.
NOTE: when the chip comes from the factory it will
automatically go to ISP, so no ‘first time mode’ is required.
Erik
