add thumbv7m target

.cargo/config.toml

@@ -1,8 +1,9 @@
 [target.thumbv7m-none-eabi]
+runner = 'probe-rs run --chip STM32F302R8Tx'
 # uncomment this to make `cargo run` execute programs on QEMU
 # runner = "qemu-system-arm -cpu cortex-m3 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
 
-[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+#[target.'cfg(all(target_arch = "arm", target_os = "none"))']
 rustflags = []
 
 [build]

.rustfmt.toml

@@ -0,0 +1,4 @@
+imports_granularity = "Crate"
+group_imports = "StdExternalCrate"
+wrap_comments = true
+edition = "2021"

Cargo.toml

@@ -25,3 +25,7 @@ bench = false
 codegen-units = 1 # better optimizations
 debug = true # symbols are nice and they don't increase the size on Flash
 lto = true # better optimizations
+
+[profile.dev.package."*"]
+opt-level = "z"
+debug = true

src/main.rs

@@ -1,45 +1,59 @@
 #![no_std]
 #![no_main]
 
-use stm32f3xx_hal::{self as hal, adc, pac, prelude::*};
-
-use {defmt_rtt as _, panic_halt as _};
+use cortex_m::asm;
+use defmt_rtt as _;
+#[allow(deprecated)]
+use hal::pwm::tim2;
+use hal::{adc, flash::FlashExt, gpio::GpioExt, hal::PwmPin, pac, prelude::*, rcc::RccExt};
+use panic_halt as _;
+use stm32f3xx_hal as hal;
 
 static POT_MAX: u16 = 4095;
 
-mod motor;
-//use motor::*;
-
 #[cortex_m_rt::entry]
 fn main() -> ! {
-    let sp = pac::Peripherals::take().unwrap();
-    let mut rcc = sp.RCC.constrain();
-    let mut gpiob = sp.GPIOB.split(&mut rcc.ahb);
-    let mut led = gpiob
-        .pb2
-        .into_push_pull_output(&mut gpiob.moder, &mut gpiob.otyper);
+    let dp = pac::Peripherals::take().unwrap();
 
+    // Configure our clocks
+    let mut flash = dp.FLASH.constrain();
+    let mut rcc = dp.RCC.constrain();
+    let clocks = rcc.cfgr.sysclk(16.MHz()).freeze(&mut flash.acr);
+
+    let mut gpiob = dp.GPIOB.split(&mut rcc.ahb);
+    let mut gpioa = dp.GPIOA.split(&mut rcc.ahb);
+    let led = gpioa
+        .pa5
+        .into_af_push_pull(&mut gpioa.moder, &mut gpioa.otyper, &mut gpioa.afrl);
     let mut pot = gpiob.pb1.into_analog(&mut gpiob.moder, &mut gpiob.pupdr);
 
-    let mut flash = sp.FLASH.constrain();
-    let clocks = rcc.cfgr.freeze(&mut flash.acr);
-    let cp = cortex_m::Peripherals::take().unwrap();
-    let mut delay = hal::delay::Delay::new(cp.SYST, clocks);
-
-    let adc_common = adc::CommonAdc::new(sp.ADC1_2, &clocks, &mut rcc.ahb);
+    let adc_common = adc::CommonAdc::new(dp.ADC1_2, &clocks, &mut rcc.ahb);
     let mut padc = adc::Adc::new(
-        sp.ADC1,
+        dp.ADC1,
         adc::config::Config::default(),
         &clocks,
         &adc_common,
     );
 
-    loop {
-        let pot_out: u16 = padc.read(&mut pot).unwrap_or(0);
-        let pot_out = (POT_MAX - pot_out) as f32 / POT_MAX as f32;
-        let pot_out = (4000.0 * pot_out) as u32;
+    // TIM2
+    //
+    // A 32-bit timer, so we can set a larger resolution
+    #[allow(deprecated)]
+    let tim2_channels = tim2(
+        dp.TIM2,
+        160000,  // resolution of duty cycle
+        50.Hz(), // frequency of period
+        &clocks, // To get the timer's clock speed
+    );
 
-        led.toggle().unwrap();
-        delay.delay_ms(pot_out);
+    let mut led_pwm = tim2_channels.0.output_to_pa5(led);
+    let max = led_pwm.get_max_duty();
+
+    loop {
+        asm::wfi();
+        let pot_out: u16 = padc.read(&mut pot).unwrap_or(0);
+        let pot_out = (pot_out as f32 / POT_MAX as f32) as u32;
+        led_pwm.set_duty(max * pot_out);
+        led_pwm.enable();
     }
 }