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Hi Guys,
I already had success to configuring my dimmer device, as I posted before in PWM Definitions Part 1, 2 and 3.
I included electronics components to do the LED Light Driver, but during the test I observed that the light LED lamp flicking bellow 75%. I suspect that it occurring because the Timer settings, specially Freq/Period (halTimer1SetPeriod (4292); // 233Hz) defined to Timer 1.
Somebody had an experience like that to advise how to fix it?
Someone has some article to help me understand this better?
to help me understand this better?
Bellow You can see timer 1 settings in timer.c file:
void HalTimer1Init (halTimerCBack_t cBack)
{
T1CCTL0 = 0; /* Make sure interrupts are disabled */
T1CCTL1 = 0; /* Make sure interrupts are disabled */
T1CCTL2 = 0; /* Make sure interrupts are disabled */
T1CCTL3 = 0; /* Make sure interrupts are disabled */
T1CCTL4 = 0; /* Make sure interrupts are disabled */
/* Setup prescale & clock for timer0 */
halTimerRecord[HW_TIMER_1].prescale = HAL_TIMER1_16_PRESCALE;
halTimerRecord[HW_TIMER_1].clock = HAL_TIMER_32MHZ;
halTimerRecord[HW_TIMER_1].prescaleVal = HAL_TIMER1_16_PRESCALE_VAL;
/* Setup Timer1 Channel structure */
halTimer1Channel[0].TxCCTL = TCHN_T1CCTL;
halTimer1Channel[0].TxCCL = TCHN_T1CCL;
halTimer1Channel[0].TxCCH = TCHN_T1CCH;
halTimerRecord[HW_TIMER_1].configured = TRUE;
halTimerRecord[HW_TIMER_1].opMode = HAL_TIMER1_OPMODE_UPDOWN;
halTimerRecord[HW_TIMER_1].channel = 0;
halTimerRecord[HW_TIMER_1].channelMode = 0;
halTimerRecord[HW_TIMER_1].intEnable = FALSE;
halTimerRecord[HW_TIMER_1].callBackFunc = cBack;
Timer1MaxCount = halTimer1SetPeriod (4292); // 233Hz
halTimerSetPrescale (HW_TIMER_1, halTimerRecord[HW_TIMER_1].prescale);
halTimerSetChannelMode (HW_TIMER_1, halTimerRecord[HW_TIMER_1].channelMode);
halTimer1SetChannelCCTL(HAL_T1_CH0, 0, 1, HAL_TIMER1_CH0_CMP_MODE_SET_ON_COMP, 1, HAL_TIMER1_CH_CAP_MODE_NO);
halTimer1SetChannelCCTL(HAL_T1_CH1, 0, 1, HAL_TIMER1_CHn_CMP_MODE_CLR_ON_COMP_SET_ON_0, 1, HAL_TIMER1_CH_CAP_MODE_NO);
halTimer1SetChannelCCTL(HAL_T1_CH2, 0, 1, HAL_TIMER1_CHn_CMP_MODE_CLR_ON_COMP_SET_ON_0, 1, HAL_TIMER1_CH_CAP_MODE_NO);
halTimer1SetChannelCCTL(HAL_T1_CH3, 0, 1, HAL_TIMER1_CHn_CMP_MODE_CLR_ON_COMP_SET_ON_0, 1, HAL_TIMER1_CH_CAP_MODE_NO);
halTimer1SetChannelCCTL(HAL_T1_CH4, 0, 1, HAL_TIMER1_CHn_CMP_MODE_CLR_ON_COMP_SET_ON_0, 1, HAL_TIMER1_CH_CAP_MODE_NO);
halTimer1SetChannelDuty (HAL_T1_CH1, 0);
halTimer1SetChannelDuty (HAL_T1_CH2, 0);
halTimer1SetChannelDuty (HAL_T1_CH3, 0);
halTimer1SetChannelDuty (HAL_T1_CH4, 0);
/* set timer 1 operating mode */
T1CTL &= ~(HAL_TIMER1_OPMODE_BITS);
T1CTL |= HAL_TIMER1_OPMODE_UPDOWN;
BR
Alex
Hi Mr YK and Ryan,
I understand the phenomena that explain better why the LED light is flickering. They can see waves form bellow:
The PWM Signal (square wave), used to trigger the TRIAC, needs to establish a synchronism/timing with senoidal electrical wave. To do it, I built an external circuit (zero crossing detector) to connect, an I/O port, trough on CC2530. The Zero Crossing detector change the output port to LEVEL UP (3.3V) when Electrical wave goes through to zero.
I thing that to inspect the CC2530 input port including a conditional functions (if then or else) , connected through Zero Crossing detector, and through his port stop timer to permit timing between waves.
I´ll use the inspection at this code point:
void halTimer1SetChannelDuty (uint8 channel, uint16 promill)
{
#define MIN_PROMILL 20
uint16 count;
if (promill < MIN_PROMILL)
promill = 0;
/* Load count = ((sec/tick) x clock) / prescale */
count = (uint16)( ((uint32)(Timer1MaxCount) * promill + 500)/ 1000 );
count = ( (count >= Timer1MaxCount) ? Timer1MaxCount-1 : (count == 0 ? 1 : count) );
halTimer1SetChannelCount(channel, count)
Do you think it is right way to implement zero crossing detection? or better to use interruptions?
BR
Alex
