From e251493a161b5a383fd7f8861e3bf7ea72bf872c Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Wed, 10 Jul 2024 22:58:00 +0700
Subject: [PATCH] skip FLASH_ function to reduce dependency

---
 hw/bsp/ch32v20x/system_ch32v20x.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/bsp/ch32v20x/system_ch32v20x.c b/hw/bsp/ch32v20x/system_ch32v20x.c
index 882e7ed71..d32ee8d17 100644
--- a/hw/bsp/ch32v20x/system_ch32v20x.c
+++ b/hw/bsp/ch32v20x/system_ch32v20x.c
@@ -111,9 +111,12 @@ void SystemInit (void)
 {
   // Enable Flash enhance read mode for full 224KB
 #if defined(CH32_FLASH_ENHANCE_READ_MODE) && CH32_FLASH_ENHANCE_READ_MODE == 1
-  FLASH_Unlock_Fast();
-  FLASH->CTLR |= (1 << 24);
-  FLASH_Lock_Fast();
+  FLASH->KEYR = 0x45670123; // FLASH_Unlock_Fast();
+  FLASH->KEYR = 0xCDEF89AB;
+
+  FLASH->CTLR |= (1 << 24); // Enhanced Read Mode
+
+  FLASH->CTLR |= (1 << 15); // FLASH_Lock_Fast();
 #endif
 
   RCC->CTLR |= (uint32_t)0x00000001;