I'm trying to get the SCT running on an LPC1519 based board. I've got the SCT running propery on another board based on the LPC1517 and it is working just fine. I haven't been able to get anything working with the SCT on the LPC1519 based board.
I went back to the AN11538 SCT Cookbook to make sure that I understood what is happening and I can't get the first two demos to work at all. Here is the code that I'm using for the first demo, a 10ms interrupt:
void SCT_Init(void)
{
LPC_SCT0->CONFIG = (1 << 0) | (1 << 17); // unified 32-bit timer, auto limit
LPC_SCT0->MATCHREL[0].U = SystemCoreClock/100; // match 0 @ 100 Hz = 10 msec
LPC_SCT0->EVENT[0].STATE = 0xFFFFFFFF; // event 0 happens in all states
LPC_SCT0->EVENT[0].CTRL = (1 << 12); // match 0 condition only
LPC_SCT0->EVEN = (1 << 0); // event 0 generates an interrupt
NVIC_EnableIRQ(SCT0_IRQn); // enable SCTimer/PWM interrupt
LPC_SCT0->CTRL_U &= ~(1 << 2); // unhalt by clearing bit 2 of the CTRL
}
And the interrupt handler:
void SCT0_IRQHandler(void)
{
LPC_SCT0->EVFLAG = SCT_EVT_0; // clear Event 0 irq
LPC_SCT0->EVFLAG = SCT_EVT_1; // clear Event 1 irq
}
When I put a breakpoint in the interrupt handler it never gets triggered. I know that there is something missing, but at this point I can't see it.
I've also tried the 2nd example to blink a LED to try to toggle an output line (PIO2_3) and I don't get anything for that either:
{
LPC_SCT0->CONFIG |= 1; // unified timer
LPC_SCT0->MATCHREL[0].U = (SystemCoreClock/10)-1; // match 0 @ 10 Hz = 100 msec
LPC_SCT0->EVENT[0].STATE = (1 << 0); // event 0 only happens in state 0
LPC_SCT0->EVENT[0].CTRL = (0 << 0) | // related to match 0
(1 << 12) | // COMBMODE[13:12] = match condition only
(1 << 14) | // STATELD[14] = STATEV is loaded into state
(1 << 15); // STATEV[15] = 1 (new state is 1)
LPC_SCT0->EVENT[1].STATE = (1 << 1); // event 1 only happens in state 1
LPC_SCT0->EVENT[1].CTRL = (0 << 0) | // related to match 0
(1 << 12) | // COMBMODE[13:12] = match condition only
(1 << 14) | // STATELD[14] = STATEV is loaded into state
(0 << 15); // STATEV[15] = 0 (new state is 0)
LPC_SCT0->OUT[0].SET = (1 << 0); // event 0 will set SCT_OUT0
LPC_SCT0->OUT[0].CLR = (1 << 1); // event 1 will clear SCT_OUT0
LPC_SCT0->LIMIT_L = 0x0003; // events 0 and 1 are used as counter limit
LPC_SCT0->CTRL_L &= ~(1 << 2); // unhalt by clearing bit 2 of CTRL register
Chip_SWM_MovablePinAssign(SWM_SCT0_OUT0_O, 0x43);
}
I'm using the MCUXpresso IDE v10.0.0. Both examples were copied out of the AN11538 App Note and only modified to changed the LPC_SCT-> pointers to LPC_SCT0-> for the LPC1519 processor. For the Blinky example I added the call to assign the SCT0_OUT0_O output to PIO2_3.
Any help anyone could give me would be greatly appreciated.
