From: Martin Mares <mj@ucw.cz>
Date: Mon, 24 Feb 2020 18:24:40 +0000 (+0100)
Subject: Boot-loader: Proper reset of all peripherals
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=a6ff6505fecbc954bb41c72aa5a3377063b31b89;p=home-hw.git

Boot-loader: Proper reset of all peripherals

Otherwise, setting of USB clock prescaler can fail if the clock
is already running.
---

diff --git a/lib/dfu-bootloader.c b/lib/dfu-bootloader.c
index 637db2e..bec2c33 100644
--- a/lib/dfu-bootloader.c
+++ b/lib/dfu-bootloader.c
@@ -339,6 +339,15 @@ int main(void)
 {
 	usbd_device *usbd_dev;
 
+	// Turn off clock to all peripherals and reset them
+	RCC_AHBENR = 0x00000014;
+	RCC_APB1ENR = 0;
+	RCC_APB2ENR = 0;
+	RCC_APB1RSTR = 0x22fec9ff;
+	RCC_APB2RSTR = 0x0038fffd;
+	RCC_APB1RSTR = 0;
+	RCC_APB2RSTR = 0;
+
 	// Flash programming requires running on the internal oscillator
 	my_rcc_clock_setup_in_hsi_out_48mhz();
 
@@ -346,10 +355,6 @@ int main(void)
 	rcc_periph_clock_enable(RCC_GPIOC);
 	rcc_periph_clock_enable(RCC_USB);
 
-	rcc_periph_reset_pulse(RST_GPIOA);
-	rcc_periph_reset_pulse(RST_GPIOC);
-	rcc_periph_reset_pulse(RST_USB);
-
 #ifdef DEBUG_USART
 	// Currently, only USART1 is supported
 	rcc_periph_clock_enable(RCC_USART1);