ADC - added continuous conversion and external trigger

Author: janodw

examples/adc.rs

@@ -5,7 +5,7 @@ use panic_rtt_target as _;
 
 use cortex_m_rt::entry;
 use rtt_target::{rprint, rprintln};
-use stm32l4xx_hal::{adc::ADC, delay::Delay, pac, prelude::*};
+use stm32l4xx_hal::{adc::config, adc::ADC, delay::Delay, pac, prelude::*};
 
 #[entry]
 fn main() -> ! {
@@ -28,6 +28,7 @@ fn main() -> ! {
         &mut rcc.ahb2,
         &mut rcc.ccipr,
         &mut delay,
+        config::ExternalTriggerConfig::default(),
     );
 
     let mut gpioc = dp.GPIOC.split(&mut rcc.ahb2);

examples/adc_dma.rs

@@ -4,7 +4,7 @@
 use panic_rtt_target as _;
 use rtt_target::{rprintln, rtt_init_print};
 use stm32l4xx_hal::{
-    adc::{DmaMode, SampleTime, Sequence, ADC},
+    adc::{config, DmaMode, SampleTime, Sequence, ADC},
     delay::DelayCM,
     dma::{dma1, RxDma, Transfer, W},
     prelude::*,
@@ -60,6 +60,7 @@ const APP: () = {
             &mut rcc.ahb2,
             &mut rcc.ccipr,
             &mut delay,
+            config::ExternalTriggerConfig::default(),
         );
 
         let mut temp_pin = adc.enable_temperature(&mut delay);

examples/adc_dma_cont.rs

@@ -0,0 +1,105 @@
+#![no_main]
+#![no_std]
+
+use panic_rtt_target as _;
+use rtt_target::{rprintln, rtt_init_print};
+use stm32l4xx_hal::{
+    adc::{config, DmaMode, SampleTime, Sequence, ADC},
+    delay::DelayCM,
+    dma::{dma1, RxDma, Transfer, W},
+    prelude::*,
+};
+
+use rtic::app;
+
+const SEQUENCE_LEN: usize = 8;
+
+#[app(device = stm32l4xx_hal::stm32, peripherals = true, monotonic = rtic::cyccnt::CYCCNT)]
+const APP: () = {
+    // RTIC app is written in here!
+
+    struct Resources {
+        transfer: Option<Transfer<W, &'static mut [u16; SEQUENCE_LEN], RxDma<ADC, dma1::C1>>>,
+    }
+
+    #[init]
+    fn init(cx: init::Context) -> init::LateResources {
+        let MEMORY = {
+            static mut MEMORY: [u16; SEQUENCE_LEN] = [0u16; SEQUENCE_LEN];
+            unsafe { &mut MEMORY }
+        };
+
+        rtt_init_print!();
+
+        rprintln!("Hello from init!");
+
+        let cp = cx.core;
+        let mut dcb = cp.DCB;
+        let mut dwt = cp.DWT;
+
+        dcb.enable_trace();
+        dwt.enable_cycle_counter();
+
+        let pac = cx.device;
+
+        let mut rcc = pac.RCC.constrain();
+        let mut flash = pac.FLASH.constrain();
+        let mut pwr = pac.PWR.constrain(&mut rcc.apb1r1);
+        let dma_channels = pac.DMA1.split(&mut rcc.ahb1);
+
+        //
+        // Initialize the clocks
+        //
+        let clocks = rcc.cfgr.sysclk(80.MHz()).freeze(&mut flash.acr, &mut pwr);
+
+        let mut delay = DelayCM::new(clocks);
+
+        let mut adc = ADC::new(
+            pac.ADC1,
+            pac.ADC_COMMON,
+            &mut rcc.ahb2,
+            &mut rcc.ccipr,
+            &mut delay,
+            config::ExternalTriggerConfig::default(),
+        );
+
+        let mut temp_pin = adc.enable_temperature(&mut delay);
+
+        let dma1_channel = dma_channels.1;
+
+        let mut gpioa = pac.GPIOA.split(&mut rcc.ahb2);
+        let mut a1 = gpioa.pa0.into_analog(&mut gpioa.moder, &mut gpioa.pupdr);
+
+        adc.configure_sequence(&mut a1, Sequence::One, SampleTime::Cycles12_5);
+
+        // Heapless boxes also work very well as buffers for DMA transfers
+        let transfer = Transfer::from_adc(adc, dma1_channel, MEMORY, DmaMode::Oneshot, true, true);
+
+        init::LateResources {
+            transfer: Some(transfer),
+        }
+    }
+
+    #[idle]
+    fn idle(_cx: idle::Context) -> ! {
+        loop {
+            cortex_m::asm::nop();
+        }
+    }
+
+    #[task(binds = DMA1_CH1, resources = [transfer])]
+    fn dma1_interrupt(cx: dma1_interrupt::Context) {
+        let transfer = cx.resources.transfer;
+        if let Some(transfer_val) = transfer.take() {
+            let (buffer, rx_dma) = transfer_val.wait();
+            rprintln!("DMA measurements: {:?}", buffer);
+            *transfer = Some(Transfer::from_adc_dma(
+                rx_dma,
+                buffer,
+                DmaMode::Oneshot,
+                true,
+                true,
+            ));
+        }
+    }
+};

src/adc.rs

@@ -129,6 +129,7 @@ impl ADC {
         ahb: &mut AHB2,
         ccipr: &mut CCIPR,
         delay: &mut impl DelayUs<u32>,
+        external_trigger: config::ExternalTriggerConfig,
     ) -> Self {
         // Enable peripheral
         ADC1::enable(ahb);
@@ -183,6 +184,8 @@ impl ADC {
 
         s.calibrate(&mut vref);
 
+        s.set_external_trigger(external_trigger);
+
         s.common.ccr.modify(|_, w| w.vrefen().clear_bit());
         s
     }
@@ -389,6 +392,13 @@ impl ADC {
         self.adc.cr.modify(|_, w| w.adstart().set_bit());
     }
 
+    pub fn start_cont_conversion(&mut self) {
+        self.enable();
+        self.enable_continous();
+        self.clear_end_flags();
+        self.adc.cr.modify(|_, w| w.adstart().set_bit());
+    }
+
     pub fn is_converting(&self) -> bool {
         self.adc.cr.read().adstart().bit_is_set()
     }
@@ -426,13 +436,31 @@ impl ADC {
         }
     }
 
+    pub fn enable_continous(&mut self) {
+        self.adc.cfgr.modify(|_, w| w.cont().set_bit());
+    }
+
+    pub fn disable_continous(&mut self) {
+        self.adc.cfgr.modify(|_, w| w.cont().clear_bit());
+    }
+
     pub fn is_enabled(&self) -> bool {
         self.adc.cr.read().aden().bit_is_set()
     }
 
     pub fn disable(&mut self) {
         self.adc.cr.modify(|_, w| w.addis().set_bit());
     }
+
+    /// Sets which external trigger to use and if it is disabled, rising, falling or both
+    pub fn set_external_trigger(&mut self, ext_trg_conf: config::ExternalTriggerConfig) {
+        self.adc.cfgr.modify(|_, w| unsafe {
+            w.exten()
+                .bits(ext_trg_conf.0.into())
+                .extsel()
+                .bits(ext_trg_conf.1.into())
+        });
+    }
 }
 
 impl<C> OneShot<ADC, u16, C> for ADC
@@ -491,9 +519,17 @@ where
         buffer: BUFFER,
         dma_mode: DmaMode,
         transfer_complete_interrupt: bool,
+        continuous_conversion: bool,
     ) -> Self {
         let (adc, channel) = dma.split();
-        Transfer::from_adc(adc, channel, buffer, dma_mode, transfer_complete_interrupt)
+        Transfer::from_adc(
+            adc,
+            channel,
+            buffer,
+            dma_mode,
+            transfer_complete_interrupt,
+            continuous_conversion,
+        )
     }
 
     /// Initiate a new DMA transfer from an ADC.
@@ -508,6 +544,7 @@ where
         buffer: BUFFER,
         dma_mode: DmaMode,
         transfer_complete_interrupt: bool,
+        continuous_conversion: bool,
     ) -> Self {
         assert!(dma_mode != DmaMode::Disabled);
 
@@ -555,7 +592,11 @@ where
         atomic::compiler_fence(Ordering::Release);
 
         channel.start();
-        adc.start_conversion();
+        if continuous_conversion == false {
+            adc.start_conversion();
+        } else {
+            adc.start_cont_conversion();
+        }
 
         Transfer::w(
             buffer,
@@ -643,6 +684,87 @@ pub trait Channel: EmbeddedHalChannel<ADC, ID = u8> {
     fn set_sample_time(&mut self, adc: &ADC1, sample_time: SampleTime);
 }
 
+/// Contains types related to ADC configuration
+pub mod config {
+    /// Possible external triggers the ADC can listen to
+    #[derive(Debug, Clone, Copy)]
+    pub enum ExternalTrigger {
+        /// TIM1 compare channel 1
+        Tim_1_cc_1,
+        /// TIM1 compare channel 2
+        Tim_1_cc_2,
+        /// TIM1 compare channel 3
+        Tim_1_cc_3,
+        /// TIM2 compare channel 2
+        Tim_2_cc_2,
+        /// TIM3 trigger out
+        Tim_3_trgo,
+        /// External interupt line 11
+        Exti_11,
+        /// TIM1 trigger out
+        Tim_1_trgo,
+        /// TIM1 trigger out 2
+        Tim_1_trgo2,
+        /// TIM2 trigger out
+        Tim_2_trgo,
+        /// TIM6 trigger out
+        Tim_6_trgo,
+        /// TIM15 trigger out
+        Tim_15_trgo,
+    }
+
+    impl From<ExternalTrigger> for u8 {
+        fn from(et: ExternalTrigger) -> u8 {
+            match et {
+                ExternalTrigger::Tim_1_cc_1 => 0b0000,  // EXT0
+                ExternalTrigger::Tim_1_cc_2 => 0b0001,  // EXT1
+                ExternalTrigger::Tim_1_cc_3 => 0b0010,  // EXT2
+                ExternalTrigger::Tim_2_cc_2 => 0b0011,  // EXT3
+                ExternalTrigger::Tim_3_trgo => 0b0100,  // EXT4
+                ExternalTrigger::Exti_11 => 0b0110,     // EXT6
+                ExternalTrigger::Tim_1_trgo => 0b1001,  // EXT9
+                ExternalTrigger::Tim_1_trgo2 => 0b1010, // EXT10
+                ExternalTrigger::Tim_2_trgo => 0b1011,  // EXT11
+                ExternalTrigger::Tim_6_trgo => 0b1101,  // EXT13
+                ExternalTrigger::Tim_15_trgo => 0b1110, // EXT14
+            }
+        }
+    }
+
+    /// Possible trigger modes
+    #[derive(Debug, Clone, Copy)]
+    pub enum TriggerMode {
+        /// Don't listen to external trigger
+        Disabled,
+        /// Listen for rising edges of external trigger
+        RisingEdge,
+        /// Listen for falling edges of external trigger
+        FallingEdge,
+        /// Listen for both rising and falling edges of external trigger
+        BothEdges,
+    }
+
+    impl From<TriggerMode> for u8 {
+        fn from(tm: TriggerMode) -> u8 {
+            match tm {
+                TriggerMode::Disabled => 0b00,
+                TriggerMode::RisingEdge => 0b01,
+                TriggerMode::FallingEdge => 0b10,
+                TriggerMode::BothEdges => 0b11,
+            }
+        }
+    }
+
+    #[derive(Debug)]
+    pub struct ExternalTriggerConfig(pub TriggerMode, pub ExternalTrigger);
+
+    impl Default for ExternalTriggerConfig {
+        fn default() -> Self {
+            Self(TriggerMode::Disabled, ExternalTrigger::Tim_1_cc_1)
+        }
+    }
+}
+
 macro_rules! adc_pins {
     (
         $(

src/timer.rs

@@ -79,6 +79,33 @@ pub enum Event {
     TimeOut,
 }
 
+/// Master mode types
+pub enum MasterMode {
+    Reset = 0,
+    Enable = 1,
+    Update = 2,
+    ComparePulse = 3,
+    CompareOC1REF = 4,
+    CompareOC2REF = 5,
+    CompareOC3REF = 6,
+    CompareOC4REF = 7,
+}
+
+impl Into<u8> for MasterMode {
+    fn into(self) -> u8 {
+        match self {
+            MasterMode::Reset => 0,
+            MasterMode::Enable => 1,
+            MasterMode::Update => 2,
+            MasterMode::ComparePulse => 3,
+            MasterMode::CompareOC1REF => 4,
+            MasterMode::CompareOC2REF => 5,
+            MasterMode::CompareOC3REF => 6,
+            MasterMode::CompareOC4REF => 7
+        }
+    }
+}
+
 macro_rules! hal {
     ($($TIM:ident: ($tim:ident, $frname:ident, $apb:ident, $width:ident),)+) => {
         $(
@@ -252,6 +279,20 @@ macro_rules! hal {
                     self.tim.cr1.modify(|_, w| w.cen().clear_bit());
                     self.tim
                 }
+            }   
+        )+
+    }
+}
+
+macro_rules! master_mode {
+    ($($TIM:ident,)+) => {
+        $(
+            impl Timer<$TIM> {
+                pub fn master_mode(&mut self, mode: MasterMode) {
+                    unsafe {
+                        self.tim.cr2.modify(|_, w| w.mms().bits(mode.into()));
+                    }
+                }
             }
         )+
     }
@@ -265,6 +306,9 @@ hal! {
     TIM16: (tim16, free_running_tim16, APB2, u16),
 }
 
+// no impl for TIM1, TIM7, TIM8, TIM15
+master_mode!(TIM2, TIM6, );
+
 // missing PAC support
 // RCC_APB1RSTR1->TIM3RST not defined
 /*