From 45e322b9a332c41930d3a781830805ecd27e1682 Mon Sep 17 00:00:00 2001
From: Gareth McMullin <gareth@blacksphere.co.nz>
Date: Mon, 22 Aug 2016 09:57:52 +1200
Subject: [PATCH] Handle usart errors.

---
 src/platforms/stm32/usbuart.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/platforms/stm32/usbuart.c b/src/platforms/stm32/usbuart.c
index 7db5ea1..17d02c1 100644
--- a/src/platforms/stm32/usbuart.c
+++ b/src/platforms/stm32/usbuart.c
@@ -247,7 +247,10 @@ void usbuart_usb_in_cb(usbd_device *dev, uint8_t ep)
  */
 void USBUSART_ISR(void)
 {
+	uint32_t err = USART_SR(USBUSART);
 	char c = usart_recv(USBUSART);
+	if (err & (USART_SR_ORE | USART_SR_FE))
+		return;
 
 	/* Turn on LED */
 	gpio_set(LED_PORT_UART, LED_UART);