Blinking the LED works. Clocks should be set up correctly.

Everything works fine without USB being plugged in but faults (I think) when USB is plugged in. This is switched away from the USB code from the bootloader onto the USB code thats generated by Atmel Studio using the high level classes from ASF.

Author: tannewt

atmel-samd/.gitignore

@@ -0,0 +1 @@
+build-*/

atmel-samd/Makefile

@@ -1,10 +1,25 @@
-include ../py/mkenv.mk
+# Select the board to build for: if not given on the command line,
+# then default to PYBV10.
+BOARD ?= feather_m0_ble
+ifeq ($(wildcard boards/$(BOARD)/.),)
+$(error Invalid BOARD specified)
+endif
 
-CROSS = 0
+
+# If the build directory is not given, make it reflect the board name.
+BUILD ?= build-$(BOARD)
+
+include ../py/mkenv.mk
+-include mpconfigport.mk
+include boards/$(BOARD)/mpconfigboard.mk
 
 # qstr definitions (must come before including py.mk)
+# TODO(tannewt): Support friendly pin names like the stmhal implementations do.
+# Add $(BUILD)/pins_qstr.h $(BUILD)/modstm_qstr.h
 QSTR_DEFS = qstrdefsport.h
 
+CROSS = 0
+
 # include py core make definitions
 include ../py/py.mk
 
@@ -14,13 +29,44 @@ endif
 
 BOSSAC := /Users/tannewt/ArduinoCore-samd/tools/bossac_osx
 
+
+HAL_DIR=hal/$(MCU_SERIES)
+
 INC += -I.
 INC += -I..
 INC += -I../lib/mp-readline
+INC += -Iasf/common/boards/
+INC += -Iasf/common/services/sleepmgr/
+INC += -Iasf/common/services/usb/
+INC += -Iasf/common/services/usb/class/cdc/
+INC += -Iasf/common/services/usb/class/cdc/device/
+INC += -Iasf/common/services/usb/udc/
+INC += -Iasf/common/utils
+INC += -Iasf/common2/services/delay/
+INC +=  $(addprefix -Iasf/sam0/,\
+	drivers/extint/ \
+	drivers/port \
+	drivers/system \
+	drivers/system/clock \
+	drivers/system/clock/clock_samd21_r21_da \
+	drivers/system/interrupt \
+	drivers/system/interrupt/system_interrupt_samd21 \
+	drivers/system/pinmux \
+	drivers/system/power/power_sam_d_r \
+	drivers/system/reset/reset_sam_d_r \
+	drivers/usb/ \
+	utils \
+	utils/cmsis/samd21/include \
+	utils/cmsis/samd21/source \
+	utils/header_files \
+	utils/preprocessor \
+	)
+INC += -Iasf/thirdparty/CMSIS/Include
+INC += -Iboards/$(BOARD)/
 INC += -I$(BUILD)
 
 ifeq ($(CROSS), 1)
-CFLAGS_CORTEX_M0 = -mthumb -mabi=aapcs-linux -mcpu=cortex-m0plus -fsingle-precision-constant -Wdouble-promotion -D__SAMD21G18A__
+CFLAGS_CORTEX_M0 = -mthumb -mabi=aapcs-linux -mcpu=cortex-m0plus -fsingle-precision-constant -Wdouble-promotion -D__SAMD21G18A__ -DUSB_DEVICE_PRODUCT_ID=0x024D -DUSB_DEVICE_VENDOR_ID=0x4123 -DBOARD=USER_BOARD -ffunction-sections -fdata-sections -fshort-enums -D ARM_MATH_CM0PLUS=true -DSYSTICK_MODE -DEXTINT_CALLBACK_MODE=true -DUDD_ENABLE -DUSART_CALLBACK_MODE=true -DUSB_DEVICE_LPM_SUPPORT
 CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 -nostdlib $(CFLAGS_CORTEX_M0) $(COPT)
 else
 CFLAGS = -m32 $(INC) -Wall -Werror -ansi -std=gnu99 $(COPT)
@@ -36,16 +82,34 @@ endif
 LIBS =
 ifeq ($(CROSS), 1)
 LIBGCC_FILE_NAME = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
-LDFLAGS = -Lasf/thirdparty/CMSIS/Lib/GCC/ -L $(dir $(LIBGCC_FILE_NAME)) -nostdlib -T samd21.ld -Map=$@.map --cref
+LDFLAGS = -Lasf/thirdparty/CMSIS/Lib/GCC/ -L $(dir $(LIBGCC_FILE_NAME)) -nostdlib -T $(LD_FILE) -Map=$@.map --cref --gc-sections
 LIBS += -larm_cortexM0l_math -lgcc
 else
 LD = gcc
 LDFLAGS = -m32 -Wl,-Map=$@.map,--cref
 endif
 
+
+SRC_ASF = $(addprefix asf/sam0/,\
+	drivers/port/port.c \
+	drivers/system/clock/clock_samd21_r21_da/clock.c \
+	drivers/system/clock/clock_samd21_r21_da/gclk.c \
+	drivers/system/pinmux/pinmux.c \
+	drivers/system/system.c \
+	drivers/usb/stack_interface/usb_device_udd.c \
+	drivers/usb/stack_interface/usb_dual.c \
+	drivers/usb/usb_sam_d_r/usb.c \
+	)
+
 SRC_C = \
 	main.c \
-	uart_core.c \
+	mphalport.c \
+	asf/common/services/sleepmgr/samd/sleepmgr.c \
+	asf/common/services/usb/class/cdc/device/udi_cdc.c \
+	asf/common/services/usb/class/cdc/device/udi_cdc_desc.c \
+	asf/common/services/usb/udc/udc.c \
+	asf/common/utils/interrupt/interrupt_sam_nvic.c \
+	asf/common2/services/delay/sam0/systick_counter.c \
 	lib/utils/stdout_helpers.c \
 	lib/utils/printf.c \
 	lib/utils/pyexec.c \
@@ -54,6 +118,7 @@ SRC_C = \
 	$(BUILD)/_frozen_mpy.c \
 
 OBJ = $(PY_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(SRC_ASF:.c=.o))
 
 ifeq ($(CROSS), 1)
 all: $(BUILD)/firmware.bin