Port: PIC32. Hardware: explore 16
I changed the timer1 to timer3 with three places in port.c file:
1. interrupt vector
extern void __attribute__( (interrupt(ipl1), vector(_TIMER_3_VECTOR))) vT1InterruptHandler( void );
2. timer setup
OpenTimer3( ( T3_ON | T3_PS_1_8 | T3_SOURCE_INT ), ulCompareMatch );
ConfigIntTimer3( T3_INT_ON | configKERNEL_INTERRUPT_PRIORITY );
3. interrupt flag reset
mT3ClearIntFlag();
After running, found that the LCD message update faster then before. why? Thanks.

You don't say what the timer is doing so I presume it is the tick interrupt? Also you don't say what is on the LCD, is it displaying an error?

Is the timer being used by any other part of the demo? Some demo applications have a high frequency timer. Maybe there is a conflict.

I know why, the timer3 is being used by other task.