Content originally posted in LPCWare by saud_c on Fri Jul 25 00:50:10 MST 2014
Quote: saud_c
Hey guys.
I want to use a extern counter and then toggle a output. The idea behind it is using the lpc1227 in counter mode for a extern PLL.
Since the lpc1227 is way cheaper than the HEF4059 and has a bigger frequency width, I think that this is a great way of solving this problem. The idea is in using the counter with the CAP0 (PIO0_1) to count with the rising_edge to MR3 then toggle MAT0. Does anyone have any ideas?
Unfortunately it does not work. This is my code
#ifdef __USE_CMSIS
#include "LPC12xx.h"
#endif
#include <cr_section_macros.h>
unsigned int i, k;
void TIMER16_0_IRQHandler(void)
{
LPC_CT16B0->IR= 1 <<3; //this is just for security, so that the Interrupt will be enabled
}
void timer16_init(void)
{
LPC_SYSCON->SYSAHBCLKCTRL |= 1<<7;
LPC_IOCON->PIO0_28 = 0x04; // use PIO0_28 as MAT output
LPC_IOCON->PIO0_1 = 0x03; // use PIO0_1 as CAP input
LPC_CT16B0->TCR = 1; // activates counter mode
LPC_CT16B0->TC = 0; // sets Timer Counter on 0
LPC_CT16B0->MCR = 3 <<9; // activates MR3
LPC_CT16B0->MR3 = 100; // sets MR3 value on 100, if TC= MR3
// then interrupt
LPC_CT16B0->EMR = 0x31; // toggle & activate MR0
LPC_CT16B0->CTCR = 0x1; // enables Counter Mode, (CAP0 is the default
// value)
LPC_CT16B0->IR = 1 <<3; // enable Interrupt on MR3
NVIC_EnableIRQ(TIMER_16_0_IRQn);
}
int main(void) {
timer16_init();
while(1) {
}
}
