From c78e47f0c02f8debd0928f4e912888758dc532c0 Mon Sep 17 00:00:00 2001
From: Bruno Dal Bo <bruno.dalbo@hp.com>
Date: Wed, 3 Feb 2016 13:10:54 -0800
Subject: [PATCH] clean SR flags before programming CR

---
 src/stlink-common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/stlink-common.c b/src/stlink-common.c
index f2888d1..04e6167 100644
--- a/src/stlink-common.c
+++ b/src/stlink-common.c
@@ -432,6 +432,7 @@ static inline void write_flash_cr_snb(stlink_t *sl, uint32_t n) {
 }
 
 static inline void write_flash_cr_bker_pnb(stlink_t *sl, uint32_t n) {
+    stlink_write_debug32(sl, STM32L4_FLASH_SR, 0xFFFFFFFF & ~(1<<STM32L4_FLASH_SR_BSY));
     uint32_t x = read_flash_cr(sl);
     x &=~ STM32L4_FLASH_CR_OPBITS;
     x &=~ STM32L4_FLASH_CR_PAGEMASK;
-- 
2.47.2