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--- rust [2024/07/17 22:25] – river
+++ rust [2025/04/02 10:51] (current) – river
@@ Line 49: / Line 49: @@
 https://www.st.com/en/evaluation-tools/32f429idiscovery.html#documentation
+===== Abstractions =====
+  * Can work with registers directly.
+  * PAC - peripheral access crates.
+  * HAL - hardware abstraction layer.
+  * BSP - Board support package.
+RCC.constrain() - takes PAC level RCC and returns a more limited HAL compatible interface to it. You may not be able to use the PAC again after doing this, but it might be possible to get PAC interface back with some implementations.
+GPIO.split - Returns separate GPIO ports.