From ab87af90a391e842c3d2e76c7a2dad5d5db0ad5a Mon Sep 17 00:00:00 2001
From: Arksine <arksine.code@gmail.com>
Date: Sat, 25 Apr 2020 14:20:25 -0400
Subject: stm32f4:  Add support for HID bootloader

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
---
 src/stm32/stm32f4.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'src/stm32/stm32f4.c')

diff --git a/src/stm32/stm32f4.c b/src/stm32/stm32f4.c
index f8b5ab2d..9b5433af 100644
--- a/src/stm32/stm32f4.c
+++ b/src/stm32/stm32f4.c
@@ -98,7 +98,18 @@ void
 usb_request_bootloader(void)
 {
     irq_disable();
-    *(uint64_t*)USB_BOOT_FLAG_ADDR = USB_BOOT_FLAG;
+    if (CONFIG_STM32_FLASH_START_4000) {
+        // HID Bootloader
+        RCC->APB1ENR |= RCC_APB1ENR_PWREN;
+        RCC->APB1ENR;
+        PWR->CR |= PWR_CR_DBP;
+        // HID Bootloader magic key
+        RTC->BKP4R = 0x424C;
+        PWR->CR &= ~PWR_CR_DBP;
+    } else {
+        // System DFU Bootloader
+        *(uint64_t*)USB_BOOT_FLAG_ADDR = USB_BOOT_FLAG;
+    }
     NVIC_SystemReset();
 }
 
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