From 699569ec99e6921cacf390964e7b62ef96ff1307 Mon Sep 17 00:00:00 2001
From: Steins7 <steinsset@gmail.com>
Date: Tue, 16 Jul 2024 21:50:01 +0200
Subject: [PATCH] Add LSI configuration function to RCC

---
 drv/rcc.c | 10 ++++++++++
 drv/rcc.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/drv/rcc.c b/drv/rcc.c
index 73fe49b..56adbbc 100644
--- a/drv/rcc.c
+++ b/drv/rcc.c
@@ -60,6 +60,16 @@ void rcc_configure(enum RccPreset preset)
 	regs->APB2ENR = apb2_enr;
 }
 
+void rcc_configure_lsi(bool enable)
+{
+	regs->CSR.LSION = enable;
+
+	//ensure LSI is enabled
+	if (enable) {
+		while (regs->CSR.LSIRDY != 0x1);
+	}
+}
+
 void rcc_enable(enum RccAhb ahb_mask, enum RccApb1 apb1_mask,
 		enum RccApb2 apb2_mask)
 {
diff --git a/drv/rcc.h b/drv/rcc.h
index 770b7a0..f26ba01 100644
--- a/drv/rcc.h
+++ b/drv/rcc.h
@@ -112,6 +112,12 @@ struct RccClocks {
  */
 void rcc_configure(enum RccPreset preset);
 
+/**
+ * Configures the Low Speed Internal (LSI) oscillator for low power
+ * applications.
+ */
+void rcc_configure_lsi(bool enable);
+
 /**
  * Enables peripherals on the different buses. The enums values can used as
  * masks to enable multiple peripherals at the same time. Invalid values will be