Add support for complimentary channel output and deadtime. #900
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| @@ -822,9 +898,13 @@ STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp | |||
| oc_config.Pulse = args[5].u_int; | |||
| oc_config.OCPolarity = args[6].u_int; | |||
| if (oc_config.OCPolarity == 0xffffffff) { | |||
| oc_config.OCPolarity = TIM_OCPOLARITY_HIGH; | |||
| oc_config.OCPolarity = TIM_OCPOLARITY_HIGH | |||
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Bah - I have to figure out how to turn off the damn tapping on my touchpad. I've already unchecked tap-to-click, but I still get taps. So I'll be typing along in one window and then all of a sudden I'm unknowngly typing in another. Sigh.
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This patch enables output on the complimentary channels (TIMx_CHyN). For timers 1 and 8, deadtime can also be inserted when the channels transition. For the pyboard, TIM8_CH1/CH1N and TIM8_CH2/CH2N can take advantage of this.
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Fixed missing semicolon (I'm sticking to my touchpad story). Fixed spelling mistake. |
dpgeorge
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Add support for complimentary channel output and deadtime.
tannewt
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.. setting it based on the ad-hoc stack pointer calculation of mp_stack_ctrl_init() meant that the stack used above main() counts against the 1KiB safety factor that the mp_stack_set_limit call tries to establish. It turns out, at least on M4, that over half of the safety factor is used up by stack-above-main()! In the case of the basics/gen_stack_overflow.py test, which blows the stack on purpose, it turns out that gc would be called while handling the "maximum recursion depth exceeded" error, and this needed more stack than was left. Closes: micropython#900
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This patch enables output on the complimentary channels (TIMx_CHyN).
Timers 1 and 8 have complimentary channels available (on the pyboard, for timer 1, only complimentary channels are available).
When available (Timers 1 and 8, Channels 1-3) deadtime can also be inserted when the channels
transition. For the pyboard, TIM8_CH1/CH1N and TIM8_CH2/CH2N can
take advantage of this.
Using deadtime is extremely useful when you're using the complimentary channnels to directly drive the top and bottom halves of an H-Bridge. The deadtime allows both the top and bottom to be inactive when transittioning. Otherwise you wind up with short periods of time when Vcc is shorted to ground (while the MOFETs are switching).