Extend SAADC one shot support

One-shot mode now permits the sampling of differential pins, and the sampling of multiple pins simultaneously.

A new ChannelConfig structure has been introduced so that multiple channels can be configured individually. Further, the `sample` method now accepts a buffer into which samples are written.

Along the way, I've reset some default configuration to align with Nordic's settings in their nrfx saadc driver. Specifically, the channel gain defaults to 6 (from 4) and the time defaults to 10us (from 20us).

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 13bcf6e5b..f8898dcd6 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,8 @@ The `embassy-nrf` crate contains implementations for nRF 52 series SoCs.
 - `uarte`: UARTE driver implementing `AsyncBufRead` and `AsyncWrite`.
 - `qspi`: QSPI driver implementing `Flash`.
 - `gpiote`: GPIOTE driver. Allows `await`ing GPIO pin changes. Great for reading buttons or receiving interrupts from external chips.
+- `saadc`: SAADC driver. Provides a full implementation of the one-shot sampling for analog channels.
+
 - `rtc`: RTC driver implementing `Clock` and `Alarm`, for use with `embassy::executor`.
 
 ## Examples