Update wb32-dfu (#16438)

builddefs/bootloader.mk

@@ -202,6 +202,10 @@ ifeq ($(strip $(BOOTLOADER)), md-boot)
     OPT_DEFS += -DBOOTLOADER_MD_BOOT
     BOOTLOADER_TYPE = md_boot
 endif
+ifeq ($(strip $(BOOTLOADER)), wb32-dfu)
+    OPT_DEFS += -DBOOTLOADER_WB32_DFU
+    BOOTLOADER_TYPE = wb32_dfu
+endif
 
 ifeq ($(strip $(BOOTLOADER_TYPE)),)
     $(call CATASTROPHIC_ERROR,Invalid BOOTLOADER,No bootloader specified. Please set an appropriate 'BOOTLOADER' in your keyboard's 'rules.mk' file.)

builddefs/mcu_selection.mk

@@ -680,7 +680,6 @@ ifneq ($(findstring WB32F3G71, $(MCU)),)
   USE_FPU ?= no
 
   # Bootloader address for WB32 DFU
-  STM32_BOOTLOADER_ADDRESS ?= 0x1FFFE000
   WB32_BOOTLOADER_ADDRESS ?= 0x1FFFE000
 endif
 

platforms/chibios/bootloaders/wb32_dfu.c

@@ -0,0 +1,49 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bootloader.h"
+
+#include <ch.h>
+#include <hal.h>
+#include "wait.h"
+
+extern uint32_t __ram0_end__;
+
+/* This code should be checked whether it runs correctly on platforms */
+#    define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
+#    define BOOTLOADER_MAGIC 0xDEADBEEF
+#    define MAGIC_ADDR (unsigned long *)(SYMVAL(__ram0_end__) - 4)
+
+__attribute__((weak)) void bootloader_jump(void) {
+    *MAGIC_ADDR = BOOTLOADER_MAGIC; // set magic flag => reset handler will jump into boot loader
+    NVIC_SystemReset();
+}
+
+void enter_bootloader_mode_if_requested(void) {
+    unsigned long *check = MAGIC_ADDR;
+    if (*check == BOOTLOADER_MAGIC) {
+        *check = 0;
+        __set_CONTROL(0);
+        __set_MSP(*(__IO uint32_t *)WB32_BOOTLOADER_ADDRESS);
+        __enable_irq();
+
+        typedef void (*BootJump_t)(void);
+        BootJump_t boot_jump = *(BootJump_t *)(WB32_BOOTLOADER_ADDRESS + 4);
+        boot_jump();
+        while (1)
+            ;
+    }
+}