Flatten Uart module, remove unnecessary data, replace methods with apply_config (#2449)

* Flatten uart config

* Do not remember at_command config

* Don't save config values in memory

* Move config implementations to Info

* Changelog

* Remove unused methods

* apply_config, SetConfig

* Fix test

* simplify futures

* Update esp-hal/CHANGELOG.md

Co-authored-by: Sergio Gasquez Arcos <sergio.gasquez@gmail.com>

---------

Co-authored-by: Sergio Gasquez Arcos <sergio.gasquez@gmail.com>

esp-hal/CHANGELOG.md

@@ -29,6 +29,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `gpio::{GpioPin, AnyPin, Flex, Output, OutputOpenDrain}::split()` to obtain peripheral interconnect signals. (#2418)
 - `gpio::Input::{split(), into_peripheral_output()}` when used with output pins. (#2418)
 - `gpio::Output::peripheral_input()` (#2418)
+- `{Uart, UartRx, UartTx}::apply_config()` (#2449)
+- `{Uart, UartRx, UartTx}` now implement `embassy_embedded_hal::SetConfig` (#2449)
 
 ### Changed
 
@@ -46,6 +48,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Allow users to create DMA `Preparation`s (#2455)
 - The `rmt::asynch::RxChannelAsync` and `rmt::asynch::TxChannelAsync` traits have been moved to `rmt` (#2430)
 - Calling `AnyPin::output_signals` on an input-only pin (ESP32 GPIO 34-39) will now result in a panic. (#2418)
+- UART configuration types have been moved to `esp_hal::uart` (#2449)
 
 ### Fixed
 
@@ -74,6 +77,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Removed the pin type parameters from `lcd_cam::cam::{RxEightBits, RxSixteenBits}` (#2388)
 - Most of the async-specific constructors (`new_async`, `new_async_no_transceiver`) have been removed. (#2430)
 - The `configure_for_async` DMA functions have been removed (#2430)
+- The `Uart::{change_baud, change_stop_bits}` functions have been removed (#2449)
 
 ## [0.21.1]
 

esp-hal/Cargo.toml

@@ -25,6 +25,7 @@ defmt                    = { version = "0.3.8", optional = true }
 delegate                 = "0.12.0"
 digest                   = { version = "0.10.7", default-features = false, optional = true }
 document-features        = "0.2.10"
+embassy-embedded-hal     = "0.2.0"
 embassy-futures          = "0.1.1"
 embassy-sync             = "0.6.0"
 embassy-usb-driver       = { version = "0.1.0", optional = true }

esp-hal/MIGRATING-0.21.md

@@ -230,3 +230,17 @@ The previous signal function have been replaced by `split`. This change affects
 
 `into_peripheral_output`, `split` (for output pins only) and `peripheral_input` have been added to
 the GPIO drivers (`Input`, `Output`, `OutputOpenDrain` and `Flex`) instead.
+
+## Changes to peripheral configuration
+
+### The `uart::config` module has been removed
+
+The module's contents have been moved into `uart`.
+
+```diff
+-use esp_hal::uart::config::Config;
++use esp_hal::uart::Config;
+```
+
+If you work with multiple configurable peripherals, you may want to import the `uart` module and
+refer to the `Config` struct as `uart::Config`.

examples/src/bin/embassy_serial.rs

@@ -15,12 +15,7 @@ use esp_backtrace as _;
 use esp_hal::{
     gpio::Io,
     timer::timg::TimerGroup,
-    uart::{
-        config::{AtCmdConfig, Config},
-        Uart,
-        UartRx,
-        UartTx,
-    },
+    uart::{AtCmdConfig, Config, Uart, UartRx, UartTx},
     Async,
 };
 use static_cell::StaticCell;

examples/src/bin/lp_core_uart.rs

@@ -22,7 +22,7 @@ use esp_hal::{
     },
     lp_core::{LpCore, LpCoreWakeupSource},
     prelude::*,
-    uart::{config::Config, lp_uart::LpUart, Uart},
+    uart::{lp_uart::LpUart, Config, Uart},
 };
 use esp_println::println;
 

examples/src/bin/serial_interrupts.rs

@@ -15,11 +15,7 @@ use esp_hal::{
     delay::Delay,
     gpio::Io,
     prelude::*,
-    uart::{
-        config::{AtCmdConfig, Config},
-        Uart,
-        UartInterrupt,
-    },
+    uart::{AtCmdConfig, Config, Uart, UartInterrupt},
     Blocking,
 };
 

hil-test/tests/uart.rs

@@ -9,7 +9,7 @@ use embedded_hal_02::serial::{Read, Write};
 use esp_hal::{
     gpio::Io,
     prelude::*,
-    uart::{ClockSource, Uart},
+    uart::{self, ClockSource, Uart},
     Blocking,
 };
 use hil_test as _;
@@ -91,8 +91,14 @@ mod tests {
         ];
 
         let mut byte_to_write = 0xA5;
-        for (baud, clock_source) in &configs {
-            ctx.uart.change_baud(*baud, *clock_source);
+        for (baudrate, clock_source) in configs {
+            ctx.uart
+                .apply_config(&uart::Config {
+                    baudrate,
+                    clock_source,
+                    ..Default::default()
+                })
+                .unwrap();
             ctx.uart.write(byte_to_write).ok();
             let read = block!(ctx.uart.read());
             assert_eq!(read, Ok(byte_to_write));