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Respect the User's Guide by disabling a PWM channel before changing its params

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It seemed to work just to change the PWM frequency and duty cycle on the fly
but the User's Guid says to disable itberfore doing this. So we do.
This commit is contained in:
Martin Guy 2011-10-05 02:44:47 +02:00
parent 7713a185bb
commit a11b839dd5
1 changed files with 4 additions and 6 deletions
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10
src/platform/avr32/pwm.c
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@ -208,16 +208,14 @@ void pwm_channel_set_period_and_duty_cycle( unsigned id, u32 period, u32 duty )
}
}
#else
// No nasty interrupts: just disable, configure and re-enable.
// In practice, it seems you don't even need to disable the channel
// like the User's Guide tells you to, so we don't bother.
// No nasty asynchronous stuff. just disable, configure and re-enable.
{
//int was_enabled = AVR32_PWM.sr & (1 << id);
int was_enabled = AVR32_PWM.sr & (1 << id);
//if (was_enabled) AVR32_PWM.dis = 1 << id;
if (was_enabled) AVR32_PWM.dis = 1 << id;
AVR32_PWM.channel[id].cprd = period;
AVR32_PWM.channel[id].cdty = duty;
//if (was_enabled) AVR32_PWM.ena = 1 << id;
if (was_enabled) AVR32_PWM.ena = 1 << id;
}
#endif
}