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stm32/pwm: improve dead-time api

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This commit is contained in:
xoviat
2023-05-01 16:42:03 -05:00
parent 7646f18836
commit cd88e39f5f
2 changed files with 143 additions and 34 deletions
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31
examples/stm32f4/src/bin/pwm_complementary.rs
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@ -4,7 +4,7 @@
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::pwm::complementary_pwm::{Ckd, ComplementaryPwm, ComplementaryPwmPin};
use embassy_stm32::pwm::complementary_pwm::{ComplementaryPwm, ComplementaryPwmPin};
use embassy_stm32::pwm::simple_pwm::PwmPin;
use embassy_stm32::pwm::Channel;
use embassy_stm32::time::khz;
@ -31,34 +31,9 @@ async fn main(_spawner: Spawner) {
khz(10),
);
/*
Dead-time = T_clk * T_dts * T_dtg
T_dts:
This bit-field indicates the division ratio between the timer clock (CK_INT) frequency and the
dead-time and sampling clock (tDTS)used by the dead-time generators and the digital filters
(ETR, TIx),
00: tDTS=tCK_INT
01: tDTS=2*tCK_INT
10: tDTS=4*tCK_INT
T_dtg:
This bit-field defines the duration of the dead-time inserted between the complementary
outputs. DT correspond to this duration.
DTG[7:5]=0xx => DT=DTG[7:0]x tdtg with tdtg=tDTS.
DTG[7:5]=10x => DT=(64+DTG[5:0])xtdtg with Tdtg=2xtDTS.
DTG[7:5]=110 => DT=(32+DTG[4:0])xtdtg with Tdtg=8xtDTS.
DTG[7:5]=111 => DT=(32+DTG[4:0])xtdtg with Tdtg=16xtDTS.
Example if TDTS=125ns (8MHz), dead-time possible values are:
0 to 15875 ns by 125 ns steps,
16 us to 31750 ns by 250 ns steps,
32 us to 63us by 1 us steps,
64 us to 126 us by 2 us steps
*/
pwm.set_dead_time_clock_division(Ckd::DIV1);
pwm.set_dead_time_value(0);
let max = pwm.get_max_duty();
pwm.set_dead_time(max / 1024);
pwm.enable(Channel::Ch1);
info!("PWM initialized");