From c83552eadcf7546acf8bf4de47d7d9243ffe56d0 Mon Sep 17 00:00:00 2001 From: Adam Greig Date: Sat, 22 Jul 2023 12:45:18 +0100 Subject: stm32: fix DAC examples The DAC driver defaults to enabling the channel trigger, but leaves it at the default value of TIM6 TRGO, then performs a software trigger after writing the new output value. We could change the trigger selection to software trigger, but for this example it's simpler to just disable the trigger. --- examples/stm32h7/src/bin/dac.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'examples/stm32h7/src') diff --git a/examples/stm32h7/src/bin/dac.rs b/examples/stm32h7/src/bin/dac.rs index 586b4154b..ee078286b 100644 --- a/examples/stm32h7/src/bin/dac.rs +++ b/examples/stm32h7/src/bin/dac.rs @@ -21,11 +21,11 @@ fn main() -> ! { let p = embassy_stm32::init(config); let mut dac = DacCh1::new(p.DAC1, NoDma, p.PA4); + unwrap!(dac.set_trigger_enable(false)); loop { for v in 0..=255 { unwrap!(dac.set(Value::Bit8(to_sine_wave(v)))); - dac.trigger(); } } } -- cgit From 3690af9bea5968653780d296146a91c63994d89d Mon Sep 17 00:00:00 2001 From: Dario Nieuwenhuis Date: Fri, 28 Jul 2023 15:29:27 +0200 Subject: stm32/timer: merge pwm module into timer. (#1703) The traits there are applicable to timer use cases other than PWM. It doesn't make sense to keep them separated. --- examples/stm32h7/src/bin/low_level_timer_api.rs | 2 +- examples/stm32h7/src/bin/pwm.rs | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'examples/stm32h7/src') diff --git a/examples/stm32h7/src/bin/low_level_timer_api.rs b/examples/stm32h7/src/bin/low_level_timer_api.rs index d360df085..45b0872b5 100644 --- a/examples/stm32h7/src/bin/low_level_timer_api.rs +++ b/examples/stm32h7/src/bin/low_level_timer_api.rs @@ -6,8 +6,8 @@ use defmt::*; use embassy_executor::Spawner; use embassy_stm32::gpio::low_level::AFType; use embassy_stm32::gpio::Speed; -use embassy_stm32::pwm::*; use embassy_stm32::time::{khz, mhz, Hertz}; +use embassy_stm32::timer::*; use embassy_stm32::{into_ref, Config, Peripheral, PeripheralRef}; use embassy_time::{Duration, Timer}; use {defmt_rtt as _, panic_probe as _}; diff --git a/examples/stm32h7/src/bin/pwm.rs b/examples/stm32h7/src/bin/pwm.rs index c5c0dd290..adf2ea9ce 100644 --- a/examples/stm32h7/src/bin/pwm.rs +++ b/examples/stm32h7/src/bin/pwm.rs @@ -4,9 +4,9 @@ use defmt::*; use embassy_executor::Spawner; -use embassy_stm32::pwm::simple_pwm::{PwmPin, SimplePwm}; -use embassy_stm32::pwm::Channel; use embassy_stm32::time::{khz, mhz}; +use embassy_stm32::timer::simple_pwm::{PwmPin, SimplePwm}; +use embassy_stm32::timer::Channel; use embassy_stm32::Config; use embassy_time::{Duration, Timer}; use {defmt_rtt as _, panic_probe as _}; -- cgit From b57ba84da5f287d7c2d4899c485b2732ff2745a2 Mon Sep 17 00:00:00 2001 From: JuliDi <20155974+JuliDi@users.noreply.github.com> Date: Fri, 28 Jul 2023 16:34:20 +0200 Subject: add dac-dma example for h7, remove memory.x --- examples/stm32h7/src/bin/dac_dma.rs | 140 ++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 examples/stm32h7/src/bin/dac_dma.rs (limited to 'examples/stm32h7/src') diff --git a/examples/stm32h7/src/bin/dac_dma.rs b/examples/stm32h7/src/bin/dac_dma.rs new file mode 100644 index 000000000..a9cb5d1ed --- /dev/null +++ b/examples/stm32h7/src/bin/dac_dma.rs @@ -0,0 +1,140 @@ +#![no_std] +#![no_main] +#![feature(type_alias_impl_trait)] + +use defmt::*; +use embassy_executor::Spawner; +use embassy_stm32::dac::{DacChannel, ValueArray}; +use embassy_stm32::pac::timer::vals::{Mms, Opm}; +use embassy_stm32::peripherals::{TIM6, TIM7}; +use embassy_stm32::rcc::low_level::RccPeripheral; +use embassy_stm32::time::{mhz, Hertz}; +use embassy_stm32::timer::low_level::Basic16bitInstance; +use micromath::F32Ext; +use {defmt_rtt as _, panic_probe as _}; + +pub type Dac1Type = + embassy_stm32::dac::DacCh1<'static, embassy_stm32::peripherals::DAC1, embassy_stm32::peripherals::DMA1_CH3>; + +pub type Dac2Type = + embassy_stm32::dac::DacCh2<'static, embassy_stm32::peripherals::DAC1, embassy_stm32::peripherals::DMA1_CH4>; + +#[embassy_executor::main] +async fn main(spawner: Spawner) { + let mut config = embassy_stm32::Config::default(); + config.rcc.sys_ck = Some(mhz(400)); + config.rcc.hclk = Some(mhz(100)); + config.rcc.pll1.q_ck = Some(mhz(100)); + + // Initialize the board and obtain a Peripherals instance + let p: embassy_stm32::Peripherals = embassy_stm32::init(config); + + // Obtain two independent channels (p.DAC1 can only be consumed once, though!) + let (dac_ch1, dac_ch2) = embassy_stm32::dac::Dac::new(p.DAC1, p.DMA1_CH3, p.DMA1_CH4, p.PA4, p.PA5).split(); + + spawner.spawn(dac_task1(dac_ch1)).ok(); + spawner.spawn(dac_task2(dac_ch2)).ok(); +} + +#[embassy_executor::task] +async fn dac_task1(mut dac: Dac1Type) { + let data: &[u8; 256] = &calculate_array::<256>(); + + info!("TIM6 frequency is {}", TIM6::frequency()); + const FREQUENCY: Hertz = Hertz::hz(200); + + // Compute the reload value such that we obtain the FREQUENCY for the sine + let reload: u32 = (TIM6::frequency().0 / FREQUENCY.0) / data.len() as u32; + + // Depends on your clock and on the specific chip used, you may need higher or lower values here + if reload < 10 { + error!("Reload value {} below threshold!", reload); + } + + dac.select_trigger(embassy_stm32::dac::Ch1Trigger::Tim6).unwrap(); + dac.enable_channel().unwrap(); + + TIM6::enable(); + TIM6::regs().arr().modify(|w| w.set_arr(reload as u16 - 1)); + TIM6::regs().cr2().modify(|w| w.set_mms(Mms::UPDATE)); + TIM6::regs().cr1().modify(|w| { + w.set_opm(Opm::DISABLED); + w.set_cen(true); + }); + + debug!( + "TIM6 Frequency {}, Target Frequency {}, Reload {}, Reload as u16 {}, Samples {}", + TIM6::frequency(), + FREQUENCY, + reload, + reload as u16, + data.len() + ); + + // Loop technically not necessary if DMA circular mode is enabled + loop { + info!("Loop DAC1"); + if let Err(e) = dac.write(ValueArray::Bit8(data), true).await { + error!("Could not write to dac: {}", e); + } + } +} + +#[embassy_executor::task] +async fn dac_task2(mut dac: Dac2Type) { + let data: &[u8; 256] = &calculate_array::<256>(); + + info!("TIM7 frequency is {}", TIM7::frequency()); + + const FREQUENCY: Hertz = Hertz::hz(600); + let reload: u32 = (TIM7::frequency().0 / FREQUENCY.0) / data.len() as u32; + + if reload < 10 { + error!("Reload value {} below threshold!", reload); + } + + TIM7::enable(); + TIM7::regs().arr().modify(|w| w.set_arr(reload as u16 - 1)); + TIM7::regs().cr2().modify(|w| w.set_mms(Mms::UPDATE)); + TIM7::regs().cr1().modify(|w| { + w.set_opm(Opm::DISABLED); + w.set_cen(true); + }); + + dac.select_trigger(embassy_stm32::dac::Ch2Trigger::Tim7).unwrap(); + + debug!( + "TIM7 Frequency {}, Target Frequency {}, Reload {}, Reload as u16 {}, Samples {}", + TIM7::frequency(), + FREQUENCY, + reload, + reload as u16, + data.len() + ); + + if let Err(e) = dac.write(ValueArray::Bit8(data), true).await { + error!("Could not write to dac: {}", e); + } +} + +fn to_sine_wave(v: u8) -> u8 { + if v >= 128 { + // top half + let r = 3.14 * ((v - 128) as f32 / 128.0); + (r.sin() * 128.0 + 127.0) as u8 + } else { + // bottom half + let r = 3.14 + 3.14 * (v as f32 / 128.0); + (r.sin() * 128.0 + 127.0) as u8 + } +} + +fn calculate_array() -> [u8; N] { + let mut res = [0; N]; + let mut i = 0; + while i < N { + res[i] = to_sine_wave(i as u8); + i += 1; + } + res +} -- cgit