From 689c2f9baf835b55cdbb68d78b0913d8ca6df317 Mon Sep 17 00:00:00 2001
From: Arksine <9563098+Arksine@users.noreply.github.com>
Date: Sat, 3 Apr 2021 06:54:07 -0400
Subject: [PATCH] stm32f1: reset peripherals in enable_pcclock()

Some bootloaders do not disable peripherals in use before jumping to the application.  Reset peripherals to assure correct operation.

SIgned-off-by:  Eric Callahan <arksine.code@gmail.com>
---
 src/stm32/stm32f1.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/stm32/stm32f1.c b/src/stm32/stm32f1.c
index ae8fcd67..34c28573 100644
--- a/src/stm32/stm32f1.c
+++ b/src/stm32/stm32f1.c
@@ -21,10 +21,14 @@ enable_pclock(uint32_t periph_base)
         uint32_t pos = (periph_base - APB1PERIPH_BASE) / 0x400;
         RCC->APB1ENR |= (1<<pos);
         RCC->APB1ENR;
+        RCC->APB1RSTR |= (1<<pos);
+        RCC->APB1RSTR &= ~(1<<pos);
     } else if (periph_base < AHBPERIPH_BASE) {
         uint32_t pos = (periph_base - APB2PERIPH_BASE) / 0x400;
         RCC->APB2ENR |= (1<<pos);
         RCC->APB2ENR;
+        RCC->APB2RSTR |= (1<<pos);
+        RCC->APB2RSTR &= ~(1<<pos);
     } else {
         uint32_t pos = (periph_base - AHBPERIPH_BASE) / 0x400;
         RCC->AHBENR |= (1<<pos);