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#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::gpio::{AfType, Flex, OutputType, Speed};
use embassy_stm32::time::{khz, Hertz};
use embassy_stm32::timer::low_level::{OutputCompareMode, Timer as LLTimer};
use embassy_stm32::timer::{Ch1, Ch2, Ch3, Ch4, Channel, GeneralInstance32bit4Channel, TimerPin};
use embassy_stm32::{Config, Peri};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hsi = Some(HSIPrescaler::DIV1);
config.rcc.csi = true;
config.rcc.pll1 = Some(Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV4,
mul: PllMul::MUL50,
divp: Some(PllDiv::DIV2),
divq: Some(PllDiv::DIV8), // 100mhz
divr: None,
});
config.rcc.sys = Sysclk::PLL1_P; // 400 Mhz
config.rcc.ahb_pre = AHBPrescaler::DIV2; // 200 Mhz
config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb4_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.voltage_scale = VoltageScale::Scale1;
}
let p = embassy_stm32::init(config);
info!("Hello World!");
let mut pwm = SimplePwm32::new(p.TIM5, p.PA0, p.PA1, p.PA2, p.PA3, khz(10));
let max = pwm.get_max_duty();
pwm.enable(Channel::Ch1);
info!("PWM initialized");
info!("PWM max duty {}", max);
loop {
pwm.set_duty(Channel::Ch1, 0);
Timer::after_millis(300).await;
pwm.set_duty(Channel::Ch1, max / 4);
Timer::after_millis(300).await;
pwm.set_duty(Channel::Ch1, max / 2);
Timer::after_millis(300).await;
pwm.set_duty(Channel::Ch1, max - 1);
Timer::after_millis(300).await;
}
}
pub struct SimplePwm32<'d, T: GeneralInstance32bit4Channel> {
tim: LLTimer<'d, T>,
_ch1: Flex<'d>,
_ch2: Flex<'d>,
_ch3: Flex<'d>,
_ch4: Flex<'d>,
}
impl<'d, T: GeneralInstance32bit4Channel> SimplePwm32<'d, T> {
pub fn new(
tim: Peri<'d, T>,
ch1: Peri<'d, impl TimerPin<T, Ch1>>,
ch2: Peri<'d, impl TimerPin<T, Ch2>>,
ch3: Peri<'d, impl TimerPin<T, Ch3>>,
ch4: Peri<'d, impl TimerPin<T, Ch4>>,
freq: Hertz,
) -> Self {
let af1 = ch1.af_num();
let af2 = ch2.af_num();
let af3 = ch3.af_num();
let af4 = ch4.af_num();
let mut ch1 = Flex::new(ch1);
let mut ch2 = Flex::new(ch2);
let mut ch3 = Flex::new(ch3);
let mut ch4 = Flex::new(ch4);
ch1.set_as_af_unchecked(af1, AfType::output(OutputType::PushPull, Speed::VeryHigh));
ch2.set_as_af_unchecked(af2, AfType::output(OutputType::PushPull, Speed::VeryHigh));
ch3.set_as_af_unchecked(af3, AfType::output(OutputType::PushPull, Speed::VeryHigh));
ch4.set_as_af_unchecked(af4, AfType::output(OutputType::PushPull, Speed::VeryHigh));
let mut this = Self {
tim: LLTimer::new(tim),
_ch1: ch1,
_ch2: ch2,
_ch3: ch3,
_ch4: ch4,
};
this.set_frequency(freq);
this.tim.start();
let r = this.tim.regs_gp32();
r.ccmr_output(0)
.modify(|w| w.set_ocm(0, OutputCompareMode::PwmMode1.into()));
r.ccmr_output(0)
.modify(|w| w.set_ocm(1, OutputCompareMode::PwmMode1.into()));
r.ccmr_output(1)
.modify(|w| w.set_ocm(0, OutputCompareMode::PwmMode1.into()));
r.ccmr_output(1)
.modify(|w| w.set_ocm(1, OutputCompareMode::PwmMode1.into()));
this
}
pub fn enable(&mut self, channel: Channel) {
self.tim.regs_gp32().ccer().modify(|w| w.set_cce(channel.index(), true));
}
pub fn disable(&mut self, channel: Channel) {
self.tim
.regs_gp32()
.ccer()
.modify(|w| w.set_cce(channel.index(), false));
}
pub fn set_frequency(&mut self, freq: Hertz) {
self.tim.set_frequency(freq);
}
pub fn get_max_duty(&self) -> u32 {
self.tim.regs_gp32().arr().read()
}
pub fn set_duty(&mut self, channel: Channel, duty: u32) {
defmt::assert!(duty < self.get_max_duty());
self.tim.regs_gp32().ccr(channel.index()).write_value(duty)
}
}
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