atmel-samd: Reboot to bootloader when a 1200 baud serial connection is

closed. This is how Arduino triggers the bootloader.

atmel-samd/Makefile

@@ -190,6 +190,7 @@ SRC_C = \
 	main.c \
 	moduos.c \
 	mphalport.c \
+	reset.c \
 	samd21_pins.c \
 	shared_dma.c \
 	rgb_led_status.c \

atmel-samd/boards/arduino_zero/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/circuitplayground_express/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/feather_m0_adalogger/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/feather_m0_basic/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/feather_m0_express/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/gemma_m0/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/metro_m0_express/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -19,7 +21,7 @@
 #endif
 
 #ifndef USB_DEVICE_PRODUCT_NAME
-#  define USB_DEVICE_PRODUCT_NAME "Metro M0 with Flash (Experimental)"
+#  define USB_DEVICE_PRODUCT_NAME "Metro M0 Express"
 #endif
 // #define  USB_DEVICE_SERIAL_NAME           "12...EF"
 #define  USB_DEVICE_GET_SERIAL_NAME_POINTER  serial_number
@@ -55,7 +57,8 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/boards/trinket_m0/conf_usb.h

@@ -2,6 +2,8 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "asf/common/services/usb/class/cdc/usb_protocol_cdc.h"
+
 #ifndef CONF_USB_H_INCLUDED
 #define CONF_USB_H_INCLUDED
 
@@ -55,7 +57,9 @@ extern void mp_cdc_disable(uint8_t port);
 
 #define  UDI_CDC_RX_NOTIFY(port)           usb_rx_notify()
 void usb_rx_notify(void);
-#define  UDI_CDC_SET_CODING_EXT(port,cfg)
+
+#define  UDI_CDC_SET_CODING_EXT(port,cfg) usb_coding_notify(port, cfg)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding);
 #define  UDI_CDC_SET_DTR_EXT(port,set) usb_dtr_notify(port, set)
 void usb_dtr_notify(uint8_t port, bool set);
 #define  UDI_CDC_SET_RTS_EXT(port,set) usb_rts_notify(port, set)

atmel-samd/mphalport.c

@@ -39,38 +39,42 @@ extern struct usart_module usart_instance;
 
 // Read by main to know when USB is connected.
 volatile bool mp_msc_enabled = false;
-bool mp_msc_enable()
+bool mp_msc_enable() {
-{
+    mp_msc_enabled = true;
-	mp_msc_enabled = true;
+    return true;
-	return true;
 }
 
-void mp_msc_disable()
+void mp_msc_disable() {
-{
+    mp_msc_enabled = false;
-	mp_msc_enabled = false;
 }
 
-bool mp_cdc_enable(uint8_t port)
+bool mp_cdc_enable(uint8_t port) {
-{
+    mp_cdc_enabled = false;
-	mp_cdc_enabled = false;
+    return true;
-	return true;
 }
 
-void mp_cdc_disable(uint8_t port)
+void mp_cdc_disable(uint8_t port) {
-{
+    mp_cdc_enabled = false;
-	mp_cdc_enabled = false;
 }
 
+volatile bool reset_on_disconnect = false;
+
 void usb_dtr_notify(uint8_t port, bool set) {
-	mp_cdc_enabled = set;
+    mp_cdc_enabled = set;
+    if (!set && reset_on_disconnect) {
+        reset_to_bootloader();
+    }
 }
 
 void usb_rts_notify(uint8_t port, bool set) {
     return;
 }
 
-void usb_rx_notify(void)
+void usb_coding_notify(uint8_t port, usb_cdc_line_coding_t* coding) {
-{
+    reset_on_disconnect = coding->dwDTERate == 1200;
+}
+
+void usb_rx_notify(void) {
     irqflags_t flags;
     if (mp_cdc_enabled) {
         while (udi_cdc_is_rx_ready()) {

atmel-samd/reset.c

@@ -0,0 +1,40 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "flash_api.h"
+#include "reset.h"
+
+#include "asf/sam0/utils/cmsis/samd21/include/samd21.h"
+
+// Copied from inc/uf2.h in https://github.com/Microsoft/uf2-samd21
+#define DBL_TAP_PTR ((volatile uint32_t *)(HMCRAMC0_ADDR + HMCRAMC0_SIZE - 4))
+#define DBL_TAP_MAGIC 0xf01669ef // Randomly selected, adjusted to have first and last bit set
+
+void reset_to_bootloader(void) {
+    flash_flush();
+    *DBL_TAP_PTR = DBL_TAP_MAGIC;
+    NVIC_SystemReset();
+}

atmel-samd/reset.h

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef __MICROPY_INCLUDED_ATMEL_SAMD_RESET_H__
+#define __MICROPY_INCLUDED_ATMEL_SAMD_RESET_H__
+
+void reset_to_bootloader(void);
+
+#endif  // __MICROPY_INCLUDED_ATMEL_SAMD_RESET_H__