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DS18B20 sensors require a strong pullup to be applied for the duration of the temperature conversion, within 10us of the command. The rp2xxx pins have sufficient drive strength to use as the pullup (no external mosfet needed). Add a new write_bytes_pullup() that will apply the pullup after bytes are written. Existing read_bytes()/write_bytes() has no change to onewire timing. A pio_onewire_parasite example reads multiple sensors individually, applying the strong pullup.
Embassy RP HAL
HALs implement safe, idiomatic Rust APIs to use the hardware capabilities, so raw register manipulation is not needed.
The embassy-rp HAL targets the Raspberry Pi RP2040 as well as RP235x microcontroller. The HAL implements both blocking and async APIs for many peripherals. The benefit of using the async APIs is that the HAL takes care of waiting for peripherals to complete operations in low power mode and handling interrupts, so that applications can focus on more important matters.
embassy-time time driver
If the time-driver feature is enabled, the HAL uses the TIMER peripheral as a global time driver for embassy-time, with a tick rate of 1MHz.
Embedded-hal
The embassy-rp HAL implements the traits from embedded-hal (v0.2 and 1.0) and embedded-hal-async, as well as embedded-io and embedded-io-async.
Interoperability
This crate can run on any executor.
Optionally, some features requiring embassy-time can be activated with the time-driver feature. If you enable it,
you must link an embassy-time driver in your project.