Add Microchip SAM series MCU support for RT-Thread (#5771)

* Add Microchip SAM series MCU support for RT-Thread

Add Microchip SAM series MCU support for RT-Thread, including SAM Cortex-M0+, M4F and M7.

* Add bsp directory to ignored check list

Add bsp directory to ignored check list, add microchip /samc21/same54/same70 to workflows list

* remove STDIO definition and bug fix

1. remove STDIO code from Microchip official BSP. 2. bug fix of SAME70 hpl/hpl_usart.c, samc21&same54 hpl/hpl_sercom.c baudrate update interface.  3. Add RT-Thread standard STDIO implementation on Microchip SAM MCU.

* add CAN driver & example and script fix

Add CAN driver and example for SAMC21/SAME5x/SAME70 and fix rtconfig.py issue(unused space might result link error)

* Add Chinese version README

Add Chinese version README for SAMC21/E54/E70

1 files changed, 69 insertions, 0 deletions

diff --git a/bsp/microchip/same70/rtconfig.py b/bsp/microchip/same70/rtconfig.py
new file mode 100644
index 0000000000..8fbfc8dfb4
--- /dev/null
+++ b/bsp/microchip/same70/rtconfig.py
@@ -0,0 +1,69 @@
+import os
+
+# toolchains options
+ARCH='arm'
+CPU='cortex-m7'
+CROSS_TOOL='gcc'
+
+if os.getenv('RTT_CC'):
+    CROSS_TOOL = os.getenv('RTT_CC')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+
+DEVICE_SERIES = 'SAME70'
+#DEVICE_SERIES = 'SAMS70'
+#DEVICE_SERIES = 'SAMV70'
+#DEVICE_SERIES = 'SAMV71'
+DEVICE_TYPE = '__SAME70Q21B__'
+#DEVICE_TYPE = '__SAMS70Q21B__'
+DEVICE_PART = 'same70'
+
+# cross_tool provides the cross compiler
+# EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
+if  CROSS_TOOL == 'gcc':
+    PLATFORM    = 'gcc'
+    EXEC_PATH   = r'C:/workspace/tools/embedcpp/xpack-arm-none-eabi-gcc-10.2.1-1.1/bin'
+elif CROSS_TOOL == 'keil':
+    PLATFORM    = 'armcc'
+    EXEC_PATH   = r'C:/Keil_v5'
+elif CROSS_TOOL == 'iar':
+    PLATFORM    = 'iar'
+    EXEC_PATH   = r'C:/Program Files (x86)/IAR Systems/Embedded Workbench 8.0'
+
+if os.getenv('RTT_EXEC_PATH'):
+    EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
+BUILD = 'debug'
+
+if PLATFORM == 'gcc':
+    # toolchains
+    PREFIX = 'arm-none-eabi-'
+    CC = PREFIX + 'gcc'
+    AS = PREFIX + 'gcc'
+    AR = PREFIX + 'ar'
+    CXX = PREFIX + 'g++'
+    LINK = PREFIX + 'gcc'
+    TARGET_EXT = 'elf'
+    SIZE = PREFIX + 'size'
+    OBJDUMP = PREFIX + 'objdump'
+    OBJCPY = PREFIX + 'objcopy'
+
+    DEVICE = ' -mcpu=cortex-m7 -mthumb -mfpu=fpv5-d16 -mfloat-abi=hard -ffunction-sections -fdata-sections -mlong-calls'
+    CFLAGS = DEVICE + ' -Dgcc'
+    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb '
+    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,Reset_Handler -T bsp/same70b/gcc/gcc/same70q21b_flash.ld'
+
+    CPATH = ''
+    LPATH = ''
+
+    if BUILD == 'debug':
+        CFLAGS += ' -O0 -gdwarf-2 -g'
+        AFLAGS += ' -gdwarf-2'
+    else:
+        CFLAGS += ' -O2'
+
+    CXXFLAGS = CFLAGS 
+    CFLAGS += ' -std=c99'
+
+    POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' + SIZE + ' $TARGET \n'
+