From bc21714c7ee7767c0aae6d782b6b72b954dddcdf Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Wed, 27 Nov 2019 14:49:19 +0700
Subject: [PATCH] detect bus reset

---
 hw/bsp/samg55xplained/samg55xplained.c |  5 -----
 src/portable/microchip/samg/dcd_samg.c | 19 ++++++++++++++-----
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/hw/bsp/samg55xplained/samg55xplained.c b/hw/bsp/samg55xplained/samg55xplained.c
index 67e7f9255..a5e145734 100644
--- a/hw/bsp/samg55xplained/samg55xplained.c
+++ b/hw/bsp/samg55xplained/samg55xplained.c
@@ -45,12 +45,8 @@
 #define UART_TX_PIN           GPIO(GPIO_PORTA, 28)
 #define UART_RX_PIN           GPIO(GPIO_PORTA, 27)
 
-//struct usart_async_descriptor _edbg_com;
-//static uint8_t _edbg_com_buf[64];
-
 struct _usart_sync_device _edbg_com;
 
-
 //------------- IMPLEMENTATION -------------//
 void board_init(void)
 {
@@ -81,7 +77,6 @@ void board_init(void)
 	_usart_sync_set_mode(&_edbg_com, USART_MODE_ASYNCHRONOUS);
 	_usart_sync_enable(&_edbg_com);
 
-
 #if CFG_TUSB_OS  == OPT_OS_NONE
   // 1ms tick timer (samd SystemCoreClock may not correct)
   SysTick_Config(CONF_CPU_FREQUENCY / 1000);
diff --git a/src/portable/microchip/samg/dcd_samg.c b/src/portable/microchip/samg/dcd_samg.c
index 9b9ebad7b..3eb64eb1a 100644
--- a/src/portable/microchip/samg/dcd_samg.c
+++ b/src/portable/microchip/samg/dcd_samg.c
@@ -41,10 +41,10 @@
  *------------------------------------------------------------------*/
 
 // Set up endpoint 0, clear all other endpoints
-//static void bus_reset(void)
-//{
-//
-//}
+static void bus_reset(void)
+{
+
+}
 
 // Initialize controller to device mode
 void dcd_init (uint8_t rhport)
@@ -133,9 +133,18 @@ void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr)
 //--------------------------------------------------------------------+
 void dcd_isr(uint8_t rhport)
 {
-  (void) rhport;
+  uint32_t const intr_mask   = UDP->UDP_IMR;
+  uint32_t const intr_status = UDP->UDP_ISR & intr_mask;
 
+  // clear interrupt
+  UDP->UDP_ICR = intr_status;
 
+  // Bus reset
+  if (intr_status & UDP_ISR_ENDBUSRES)
+  {
+    bus_reset();
+    dcd_event_bus_signal(rhport, DCD_EVENT_BUS_RESET, true);
+  }
 }
 
 #endif