RMT Onewire Peripheral #454
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| //! RMT Onewire Example | ||
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| //! | ||
| //! Example demonstrating the use of the onewire component. | ||
| //! | ||
| //! In order to use this example, an overidden `Cargo.toml` must be defined with the following definitions: | ||
| //! ``` | ||
| //! [[package.metadata.esp-idf-sys.extra_components]] | ||
| //! remote_component = { name = "onewire_bus", version = "^1.0.2" } | ||
| //! | ||
| //! | ||
| //! [patch.crates-io] | ||
| //! esp-idf-sys = { git = "https://github.com/esp-rs/esp-idf-sys", rev = "2728b85" } | ||
| //! | ||
| //! ``` | ||
| //! | ||
| //! The example can then be run with | ||
| //! `MCU=<target> cargo run --example rmt_onewire --manifest-path /path/to/other/Cargo.toml` | ||
| //! | ||
| //! Below is a connection sketch, the signal pin must be externally pulled-up | ||
| //! with a 4.7kOhm resistor. | ||
| //! This example uses gpio 16, but any pin capable of | ||
| //! input AND output is suitable. | ||
| //! | ||
| //! If the example is successful, it should print the address of each | ||
| //! onewire device attached to the bus. | ||
| //! | ||
| //! ┌──────────────────────────┐ | ||
| //! │ 3.3V├───────┬─────────────┬──────────────────────┐ | ||
| //! │ │ ┌┴┐ │VDD │VDD | ||
| //! │ ESP Board │ 4.7k│ │ ┌──────┴──────┐ ┌──────┴──────┐ | ||
| //! │ │ └┬┘ DQ│ │ DQ│ │ | ||
| //! │ ONEWIRE_GPIO_PIN├───────┴──┬───┤ DS18B20 │ ┌───┤ DS18B20 │ ...... | ||
| //! │ │ └───│-------------│────┴───│-------------│── | ||
| //! │ │ └──────┬──────┘ └──────┬──────┘ | ||
| //! │ │ │GND │GND | ||
| //! │ GND├─────────────────────┴──────────────────────┘ | ||
| //! └──────────────────────────┘ | ||
| //! | ||
| //! | ||
| //! This example demonstrates: | ||
| //! * A RMT device in both TX and RX mode. | ||
| //! * Usage of the onewire bus driver interface. | ||
| //! * How to iterate through a device search to discover devices on the bus. | ||
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| use std::borrow::Borrow; | ||
| use std::time::Duration; | ||
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| use esp_idf_hal::delay::FreeRtos; | ||
| #[cfg(all( | ||
| esp_idf_soc_rmt_supported, | ||
| not(feature = "rmt-legacy"), | ||
| esp_idf_comp_espressif__onewire_bus_enabled, | ||
| ))] | ||
| use esp_idf_hal::onewire::{OWCommand, OWDevice, OWDriver}; | ||
| use esp_idf_hal::peripherals::Peripherals; | ||
| use esp_idf_sys::EspError; | ||
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| #[cfg(all( | ||
| esp_idf_soc_rmt_supported, | ||
| not(esp_idf_version_major = "4"), | ||
| esp_idf_comp_espressif__onewire_bus_enabled, | ||
| ))] | ||
| fn main() -> anyhow::Result<()> { | ||
| println!("Starting APP!"); | ||
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| let peripherals = Peripherals::take()?; | ||
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| let onewire_gpio_pin = peripherals.pins.gpio16; | ||
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| let onewire_bus: OWDriver = OWDriver::new(onewire_gpio_pin)?; | ||
| let mut search = onewire_bus.search()?; | ||
| let device = search.next(); | ||
| if device.is_none() { | ||
| println!("No device found"); | ||
| return Ok(()); | ||
| } | ||
| let device = OWDevice::new(device.unwrap(), &onewire_bus); | ||
| // let device = OWDevice::new(search.next()?, &onewire_bus); | ||
| // for device in search { | ||
| println!("Found Device: {:?}", device); | ||
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| loop { | ||
| ds18b20_trigger_temp_conversion(&device, &onewire_bus)?; | ||
| let temp = ds18b20_get_temperature(&device, &onewire_bus)?; | ||
| println!("Temperature: {}", temp); | ||
| FreeRtos::delay_ms(3000); | ||
| } | ||
| } | ||
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| #[cfg(any( | ||
| feature = "rmt-legacy", | ||
| esp_idf_version_major = "4", | ||
| not(esp_idf_comp_espressif__onewire_bus_enabled), | ||
| not(esp_idf_soc_rmt_supported), | ||
| ))] | ||
| fn main() -> anyhow::Result<()> { | ||
| println!("This example requires feature `rmt-legacy` disabled, using ESP-IDF > v4.4.X, the component included in `Cargo.toml`, or is not supported on this MCU"); | ||
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| loop { | ||
| std::thread::sleep(std::time::Duration::from_millis(1000)); | ||
| } | ||
| } | ||
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| #[cfg(all( | ||
| esp_idf_soc_rmt_supported, | ||
| not(esp_idf_version_major = "4"), | ||
| esp_idf_comp_espressif__onewire_bus_enabled, | ||
| ))] | ||
| fn ds18b20_send_command<'a>( | ||
| device: &OWDevice<'a, impl Borrow<OWDriver<'a>>>, | ||
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| bus: &OWDriver, | ||
| cmd: u8, | ||
| ) -> Result<(), EspError> { | ||
| let mut buf = [0; 10]; | ||
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| buf[0] = OWCommand::MatchRom as _; | ||
| let addr = device.address().to_le_bytes(); | ||
| buf[1..9].copy_from_slice(&addr); | ||
| buf[9] = cmd; | ||
| println!( | ||
| "seend command{cmd} to addr {} [{:?}], full_msg = {:?}", | ||
| device.address(), | ||
| addr, | ||
| buf | ||
| ); | ||
| let write_size = bus.write(&buf)?; | ||
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| println!("Sent {write_size} bytes"); | ||
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| Ok(()) | ||
| } | ||
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| #[allow(dead_code)] | ||
| #[repr(u8)] | ||
| enum Ds18b20Command { | ||
| ConvertTemp = 0x44, | ||
| WriteScratch = 0x4e, | ||
| ReadScratch = 0xbe, | ||
| } | ||
| #[cfg(all( | ||
| esp_idf_soc_rmt_supported, | ||
| not(esp_idf_version_major = "4"), | ||
| esp_idf_comp_espressif__onewire_bus_enabled, | ||
| ))] | ||
| fn ds18b20_trigger_temp_conversion<'a>( | ||
| device: &OWDevice<'a, impl Borrow<OWDriver<'a>>>, | ||
| bus: &OWDriver, | ||
| ) -> Result<(), EspError> { | ||
| // reset bus and check if the ds18b20 is present | ||
| bus.reset()?; | ||
| println!( | ||
| "Bus reset, bus:{:?} device bus: {:?}", | ||
| bus, | ||
| device.bus().borrow() | ||
| ); | ||
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| ds18b20_send_command(device, bus, Ds18b20Command::ConvertTemp as u8)?; | ||
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| // delay proper time for temp conversion, | ||
| // assume max resolution (12-bits) | ||
| std::thread::sleep(Duration::from_millis(800)); | ||
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| Ok(()) | ||
| } | ||
| #[cfg(all( | ||
| esp_idf_soc_rmt_supported, | ||
| not(esp_idf_version_major = "4"), | ||
| esp_idf_comp_espressif__onewire_bus_enabled, | ||
| ))] | ||
| fn ds18b20_get_temperature<'a>( | ||
| device: &OWDevice<'a, impl Borrow<OWDriver<'a>>>, | ||
| bus: &OWDriver, | ||
| ) -> Result<f32, EspError> { | ||
| bus.reset()?; | ||
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| ds18b20_send_command(device, bus, Ds18b20Command::ReadScratch as u8)?; | ||
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| let mut buf = [0u8; 10]; | ||
| bus.read(&mut buf)?; | ||
| println!("buffer = {buf:?}"); | ||
| let lsb = buf[0]; | ||
| let msb = buf[1]; | ||
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| let temp_raw: u16 = (u16::from(msb) << 8) | u16::from(lsb); | ||
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| Ok(f32::from(temp_raw) / 16.0) | ||
| } | ||
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