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Last post
Fri, 2018-01-05 11:08
#1
前腿帕特尔
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Last seen:2 years 5 months ago
加入:2017-03-29 10:50
Timer0 PWM0

Dear Dialog_Support,

I am using timer0 pwm0 to operate and control LED brightness using timer0_set(uint16_t pwm_on, uint16_t pwm_high, uint16_t pwm_low); function. If i give timer0_set(0xFF, 0XFF, 0) then also my LED is not getting ON fully. Then i have used timer0's PWM1 then LED should fully turn OFF when i call timer0_set(0xFF, 0xFF, 0) but my LED is not going to OFF fully. LED glows at 5-10% brightness. And if i call timer0_stop function, then LED turns OFF fully. What could be the reason?

Keywords:
Timer0
timer0_set
PWM0
Device:
DA14580
Fri, 2018-01-05 16:40
MT_dialog
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Last seen:1 month 2 weeks ago
工作人员
加入:2015-06-08 11:34
Hi Ruchi Patel,

Hi Ruchi Patel,

The timer when operating in PWM mode will load the values TIMER0_RELOAD_N_REG and TIMER0_RELOAD_M_REG which are 16-bit values so, if you use 0xFF and 0x00 then you should generate a PWM pulse with a duty cycle small enough and a frequency in order to see the LED dimming, but if you load to the TIMER0_RELOAD_M_REG the full value of the timer 0xFFFF, then you will get a duty cycle where which will be enough in order to fully light a LED and keep the other LED connected to the PWM1 turned off. But there will be a pulse, it will just be for a fraction of time.

Thanks MT_dialog