Modify memory.x to reserve only as much RAM for the softdevice as necessary

memory.x

@@ -3,5 +3,5 @@ MEMORY
   /* NOTE 1 K = 1 KiB = 1024 bytes */
   /* These values correspond to the NRF52832 with SoftDevice S112 v7.x */
   FLASH : ORIGIN = 0x00000000 + 100K, LENGTH = 512K - 100K
-  RAM : ORIGIN = 0x20000000 + 30K, LENGTH = 64K - 30K
+  RAM : ORIGIN = 0x20000000 + 0x24b8, LENGTH = 64K - 0x24b8
 }

src/bin/temp_rh_measurement.rs

@@ -1,83 +1,40 @@
 #![no_std]
 #![no_main]
 
+use static_cell::StaticCell;
+
+use core::mem;
+use embassy_nrf::interrupt::{self, InterruptExt};
+use embassy_nrf::peripherals::TWISPI0;
 use embassy_time::Timer;
-use nrf_softdevice::Softdevice;
+use nrf_softdevice::ble::advertisement_builder::{
+    Flag, LegacyAdvertisementBuilder, LegacyAdvertisementPayload, ServiceList, ServiceUuid16,
+};
+use nrf_softdevice::ble::{gatt_server, peripheral};
+use nrf_softdevice::{raw, Softdevice};
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_nrf::gpio::Pin as GpioPin;
-use embassy_nrf::interrupt;
-use embassy_nrf::twim::{self, Instance as TwimInstance, InterruptHandler, Twim};
-use embassy_nrf::{bind_interrupts, peripherals, Peripheral};
+use embassy_nrf::gpio::{Level, Output, OutputDrive};
+use embassy_nrf::twim;
+use embassy_nrf::{bind_interrupts, peripherals};
 use {defmt_rtt as _, panic_probe as _};
 
-struct I2cDriver<'a, T: TwimInstance> {
+//
+//
+// Sensing code
+//
+//
+
+struct GenericTempHumiditySensor<T: twim::Instance> {
     address: u8,
-    twim: Twim<'a, T>,
-}
-
-trait Driver {
-    /// The msg being mutable ensures that it doesn't have to be copied into RAM for DMA access, as
-    /// it is already there
-    fn write(&mut self, msg: &mut [u8]);
-    fn read(&mut self, buffer: &mut [u8]);
-}
-
-impl<'a, T: TwimInstance> Driver for I2cDriver<'a, T> {
-    fn write(&mut self, msg: &mut [u8]) {
-        unwrap!(self.twim.blocking_write(self.address, &mut *msg));
-    }
-
-    fn read(&mut self, buffer: &mut [u8]) {
-        unwrap!(self.twim.blocking_read(self.address, &mut *buffer));
-    }
-}
-
-impl<'a, T: TwimInstance> I2cDriver<'a, T> {
-    fn new(
-        address: u8,
-        peripheral: impl Peripheral<P = T> + 'a,
-        sda: impl Peripheral<P = impl GpioPin> + 'a,
-        scl: impl Peripheral<P = impl GpioPin> + 'a,
-        _irq: impl interrupt::typelevel::Binding<T::Interrupt, InterruptHandler<T>> + 'a,
-    ) -> Self {
-        let config = twim::Config::default();
-        let twim = Twim::new(peripheral, _irq, sda, scl, config);
-
-        Self { address, twim }
-    }
-}
-
-struct MockI2cDriver;
-
-impl Driver for MockI2cDriver {
-    fn write(&mut self, _: &mut [u8]) {}
-
-    fn read(&mut self, buffer: &mut [u8]) {
-        buffer[0] = 127;
-        buffer[1] = 128;
-        buffer[2] = 129;
-        buffer[3] = 130;
-        buffer[4] = 131;
-        buffer[5] = 132;
-    }
-}
-
-impl MockI2cDriver {
-    fn new() -> Self {
-        Self {}
-    }
-}
-
-struct TempHumiditySensor<T: Driver> {
-    driver: T,
+    driver: twim::Twim<'static, T>,
 }
 
 // TODO: Implement CRC checks
-impl<T: Driver> TempHumiditySensor<T> {
-    fn new(driver: T) -> Self {
-        Self { driver }
+impl<T: twim::Instance> GenericTempHumiditySensor<T> {
+    fn new(address: u8, driver: twim::Twim<'static, T>) -> Self {
+        Self { address, driver }
     }
 
     /// The procedure for reading out the temperature and humidity and converting them to floats is
@@ -85,9 +42,9 @@ impl<T: Driver> TempHumiditySensor<T> {
     async fn read_temp_and_humidity(&mut self) -> (f32, f32) {
         let mut buf = [0u8; 6];
 
-        self.driver.write(&mut [0xFD]);
+        unwrap!(self.driver.blocking_write(self.address, &mut [0xFD]));
         Timer::after_millis(10).await;
-        self.driver.read(&mut buf);
+        unwrap!(self.driver.blocking_read(self.address, &mut buf));
 
         let temp_int = u16::from_be_bytes([buf[0], buf[1]]);
         let temp_float: f32 = -45f32 + 175f32 * (temp_int as f32 / (2u32.pow(16) - 1) as f32);
@@ -103,16 +60,162 @@ bind_interrupts!(struct Irqs {
     SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0 => twim::InterruptHandler<peripherals::TWISPI0>;
 });
 
-#[embassy_executor::main]
-async fn main(_spawner: Spawner) {
-    let p = embassy_nrf::init(Default::default());
-
-    let driver = I2cDriver::new(0x44, p.TWISPI0, p.P0_14, p.P0_13, Irqs);
-    let mut sensor = TempHumiditySensor::new(driver);
+type TempHumiditySensor = GenericTempHumiditySensor<TWISPI0>;
 
+#[embassy_executor::task]
+async fn measurement_task(mut sensor: TempHumiditySensor, server: &'static Server) {
     loop {
         let (temp, humidity) = sensor.read_temp_and_humidity().await;
         println!("{} °C\t{} %", temp, humidity);
-        Timer::after_millis(50).await;
+
+        let temp: u32 = (temp * 100.0) as u32;
+        let humidity: u32 = (humidity * 100.0) as u32;
+
+        unwrap!(server.bas.temperature_set(&temp));
+        unwrap!(server.bas.humidity_set(&humidity));
+
+        Timer::after_secs(5).await;
+    }
+}
+
+//
+//
+// BLE code
+//
+//
+
+#[nrf_softdevice::gatt_service(uuid = "181a")]
+struct EnvironmentalService {
+    #[characteristic(uuid = "2a6e", read, notify)]
+    temperature: u32,
+    #[characteristic(uuid = "2a6f", read, notify)]
+    humidity: u32,
+}
+
+#[nrf_softdevice::gatt_server]
+struct Server {
+    bas: EnvironmentalService,
+}
+
+#[embassy_executor::task]
+async fn softdevice_task(sd: &'static Softdevice) -> ! {
+    sd.run().await
+}
+
+#[embassy_executor::task]
+async fn ble_task(sd: &'static Softdevice, server: &'static Server) {
+    static ADV_DATA: LegacyAdvertisementPayload = LegacyAdvertisementBuilder::new()
+        .flags(&[Flag::GeneralDiscovery, Flag::LE_Only])
+        .services_16(ServiceList::Complete, &[ServiceUuid16::BATTERY])
+        .full_name("CommonSense")
+        .build();
+
+    static SCAN_DATA: LegacyAdvertisementPayload = LegacyAdvertisementBuilder::new()
+        .services_128(
+            ServiceList::Complete,
+            &[0x9e7312e0_2354_11eb_9f10_fbc30a62cf38_u128.to_le_bytes()],
+        )
+        .build();
+
+    loop {
+        info!("Creating config");
+        let config = peripheral::Config::default();
+        info!("Creating adv object");
+        let adv = peripheral::ConnectableAdvertisement::ScannableUndirected {
+            adv_data: &ADV_DATA,
+            scan_data: &SCAN_DATA,
+        };
+
+        let conn = unwrap!(peripheral::advertise_connectable(sd, adv, &config).await);
+
+        let _e = gatt_server::run(&conn, server, |e| match e {
+            ServerEvent::Bas(e) => match e {
+                EnvironmentalServiceEvent::HumidityCccdWrite { notifications } => {
+                    info!("humidity notifications: {}", notifications)
+                }
+                EnvironmentalServiceEvent::TemperatureCccdWrite { notifications } => {
+                    info!("temperature notifications: {}", notifications)
+                }
+            },
+        })
+        .await;
+
+        Timer::after_secs(10).await;
+    }
+}
+
+//
+//
+// Main code
+//
+//
+
+static SERVER: StaticCell<Server> = StaticCell::new();
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    // Set up peripherals
+
+    interrupt::SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0.set_priority(interrupt::Priority::P2);
+
+    let mut embassy_config = embassy_nrf::config::Config::default();
+    embassy_config.gpiote_interrupt_priority = interrupt::Priority::P2;
+    embassy_config.time_interrupt_priority = interrupt::Priority::P2;
+    let p = embassy_nrf::init(embassy_config);
+
+    let config = twim::Config::default();
+    let twi = twim::Twim::new(p.TWISPI0, Irqs, p.P0_14, p.P0_13, config);
+    let sensor = TempHumiditySensor::new(0x44, twi);
+
+    let mut led = Output::new(p.P0_20, Level::Low, OutputDrive::Standard);
+
+    // Set up softdevice
+
+    let config = nrf_softdevice::Config {
+        clock: Some(raw::nrf_clock_lf_cfg_t {
+            source: raw::NRF_CLOCK_LF_SRC_RC as u8,
+            rc_ctiv: 16,
+            rc_temp_ctiv: 2,
+            accuracy: raw::NRF_CLOCK_LF_ACCURACY_500_PPM as u8,
+        }),
+        conn_gap: Some(raw::ble_gap_conn_cfg_t {
+            conn_count: 1,
+            event_length: 24,
+        }),
+        conn_gatt: Some(raw::ble_gatt_conn_cfg_t { att_mtu: 256 }),
+        gatts_attr_tab_size: Some(raw::ble_gatts_cfg_attr_tab_size_t {
+            attr_tab_size: raw::BLE_GATTS_ATTR_TAB_SIZE_DEFAULT,
+        }),
+        gap_role_count: Some(raw::ble_gap_cfg_role_count_t {
+            adv_set_count: 1,
+            periph_role_count: 1,
+        }),
+        gap_device_name: Some(raw::ble_gap_cfg_device_name_t {
+            p_value: b"CommonSense" as *const u8 as _,
+            current_len: 9,
+            max_len: 9,
+            write_perm: unsafe { mem::zeroed() },
+            _bitfield_1: raw::ble_gap_cfg_device_name_t::new_bitfield_1(
+                raw::BLE_GATTS_VLOC_STACK as u8,
+            ),
+        }),
+        ..Default::default()
+    };
+
+    let sd = Softdevice::enable(&config);
+    let server = unwrap!(Server::new(sd));
+    let server: &'static mut Server = SERVER.init(server);
+
+    // Start tasks
+
+    unwrap!(spawner.spawn(softdevice_task(sd)));
+    unwrap!(spawner.spawn(ble_task(sd, server)));
+    unwrap!(spawner.spawn(measurement_task(sensor, server)));
+
+    loop {
+        led.set_high();
+        Timer::after_millis(500).await;
+        led.set_low();
+        Timer::after_millis(500).await;
     }
 }