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[NANO130] Fix first PWM pulse may not be correct issue

pull/4631/head
MS30 CCChang12 2017-06-12 14:24:28 +08:00
parent 369d65fd0d
commit a2d0b021a6
1 changed files with 4 additions and 1 deletions
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5
targets/TARGET_NUVOTON/TARGET_NANO100/pwmout_api.c
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@ -90,6 +90,8 @@ void pwmout_init(pwmout_t* obj, PinName pin)
obj->period_us = 1000 * 10; obj->period_us = 1000 * 10;
obj->pulsewidth_us = 0; obj->pulsewidth_us = 0;
pwmout_config(obj); pwmout_config(obj);
// enable inverter to ensure the first PWM cycle is correct
pwm_base->CTL |= (PWM_CTL_CH0INV_Msk << (chn * 8));
// Enable output of the specified PWM channel // Enable output of the specified PWM channel
PWM_EnableOutput(pwm_base, 1 << chn); PWM_EnableOutput(pwm_base, 1 << chn);
@ -200,7 +202,8 @@ static void pwmout_config(pwmout_t* obj)
uint32_t chn = NU_MODSUBINDEX(obj->pwm); uint32_t chn = NU_MODSUBINDEX(obj->pwm);
// NOTE: Support period < 1s // NOTE: Support period < 1s
//PWM_ConfigOutputChannel(pwm_base, chn, 1000 * 1000 / obj->period_us, obj->pulsewidth_us * 100 / obj->period_us); //PWM_ConfigOutputChannel(pwm_base, chn, 1000 * 1000 / obj->period_us, obj->pulsewidth_us * 100 / obj->period_us);
PWM_ConfigOutputChannel2(pwm_base, chn, 1000 * 1000, obj->pulsewidth_us * 100 / obj->period_us, obj->period_us); // enable inverter to ensure the first PWM cycle is correct
PWM_ConfigOutputChannel2(pwm_base, chn, 1000 * 1000, 100 - (obj->pulsewidth_us * 100 / obj->period_us), obj->period_us);
} }
#endif #endif