From 1062cf20abb9edb1d7e2c2c0ce9b4cb23977a31b Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@ditigal.xyz>
Date: Sun, 20 Oct 2024 15:28:34 +0200
Subject: [PATCH] fix: into_alternate choose alternate mode

---
 src/pin.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/pin.c b/src/pin.c
index bf985e1..dc961f6 100644
--- a/src/pin.c
+++ b/src/pin.c
@@ -67,6 +67,10 @@ void pin_into_input_highspeed(pin_t *pin) {
 
 void pin_into_alternate(pin_t *pin, uint8_t alternate) {
   pin_mode(pin, ALTERNATE);
+  uint8_t index = pin->pin >> 3;
+  uint8_t pos = (pin->pin & 0x7) * 4;
+  volatile uint32_t *afr = pin->gpio->AFR;
+  reg_set_bits_pos(afr + index, alternate, pos, 0xF);
 }
 void pin_into_alternate_highspeed(pin_t *pin, uint8_t alternate) {
   pin_into_alternate(pin, alternate);
-- 
2.48.1