Halo guys!
When I use Timer3 Alt2 on channel 0 to produce PWM, the wave from scope is abnormal for the first 20 or more seconds.
Here is my configuration.
/***************************************************************************/
void pwm_init( void )
{
IEN1 &= ~BV(3); // disable Timer3 interrupt
// use P1_6 as Timer3 channel 0
PERCFG |= BV(5); // Timer3 Alt2
P1DIR |= BV(6); // set P1_6 direction to output
P1SEL |= BV(6); // set P1_6 as peripheral
T3CCTL0 = 0x14; // disable interrupt
// Toggle output on compare, initial 0
// compare mode
// no capture
T3CTL = 0xE7; // set prescaler to Tick Frequency/128
// stop Timer3
// disable interrupt
// clear counter
// up/down mode
//T3CCTL0 |= 0x38; // Initialize output pin
}
void pwm_start( void )
{
//T3CTL |= BV(2); // clear counter
//T3CCTL0 |= 0x38; // Initialize output pin
T3CC0 = 0x7F;
T3CTL |= BV(4); // start timer
}
/***************************************************************************/
Here is the beginning 20s' picture from scope.
And here is the normal picuture from scope.
