Content originally posted in LPCWare by brobson on Mon Aug 03 05:09:28 MST 2015
Hi all, I'm new to programming with the lpc systems so my problem might be something quite basic that I am not aware of.
I'm trying to get an interrupt to occur whenever a change happens on pio1_8 and have the following bits of code to do this:
(pin set up)
LPC_IOCON->PIO1_8 |= 0x11;//selects ct16b1_CAP0 and sets pull up resistor
(timer set up, in main.c)
LPC_SYSCON->SYSAHBCLKCTRL |= 0x00000180;// Enable CT16B0 & CT16B1 Clocks
LPC_TMR16B1->PC = 0x00000000;
LPC_TMR16B1->PR = 0x00000010;
LPC_TMR16B1->TCR |= 0x01;//ENABLES TIMER AND PRESCALER COUNTER
LPC_TMR16B1->CCR |= 0x04;//SETS INTERRUPT ON STATE CHANGE AT CT16B1_CAP0
LPC_TMR16B1->CTCR |= 0x0;//SELECTS COUNT INPUT AND FLAGS TO BE RAISED ON EITHER EDGE
NVIC_EnableIRQ(TIMER_16_1_IRQn);
(interrupt handler)
void TIMER16_1_IRQHandler (void)
{
int i;
i++;
LPC_GPIO2->DATA |= (0xFC0);
LPC_GPIO2->DATA &= (0xF3F);
LPC_GPIO3->DATA |= (0x03F);
LPC_GPIO3->DATA &= (~0xFC0);
LPC_TMR16B1->IR |= 0x10;//RESET FLAG
}
I have the pin set with a pull up resistor and I am connecting a ground wire to change it, however the software doesn't seem to be picking it up. Can anyone see something wrong with my code?
