Hi, all~
To parse IR signal, use Timer 3 as timer and Timer 4 channel 0 as input capture channel. P1_0 is a input pin.
the problem is that program can enter into timer 3 interrupt but not to timer 4 interrupt. That's why? The folling is the major code:
void main(void)
{
RegisterInit();
Timer4Init();
Timer3Init();
while(1)
{
asm("nop");
}
}
void RegisterInit(void)
{
//init clock and tick frequency
CLKCONCMD &= ~0x7f; //tick speed: 32M, clock speed: 32M
while(CLKCONSTA & 0x40); //wait for crystal
//init TIMIF
TIMIF = 0x00;
//timer4 alternative 1
PERCFG &= ~0x10;
//init P1_0
P1SEL |= 0x01; //P1_0 peripheral I/O
P1DIR &= ~0x01; //P1_0 input
//init variable
timerIntCount = 0;
captureIntCount = 0;
//open global interrupts
EA = 1;
}
void Timer3Init(void)
{
T3CTL = 0x00; //default
T3CTL |= 0xA0; //tick speed / 32 = 1MHz
T3CTL |= 0x08; //timer4 overflow interrupt
T3CTL |= 0x04; //clear counter
T3CTL |= 0x01; //down mode
T3CC0 = 0xFA; //250us interrupt
T3IE = 1;
T3CTL |= 0x10; //Timer4 start
}
void Timer4Init(void)
{
T4CTL = 0x00; //default
T4CCTL0 = 0x00; //capture mode
T4CCTL0 |= 0x40; //open capture/compare interrupt
T4CCTL0 |= 0x02; //capture on failing edge
}
#pragma vector = T3_VECTOR
__interrupt void T3_ISR(void)
{
T3OVFIF = 0;
timerIntCount++;
T3CTL |= 0x10;
T3CC0 = 0xFA;
}
#pragma vector = T4_VECTOR
__interrupt void T4_ISR(void)
{
captureIntCount++;
//parse IR signal
}
Thanks everybody
