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, 41 insertions, 0 deletions

diff --git a/bsp/microchip/same54/SConstruct b/bsp/microchip/same54/SConstruct
new file mode 100644
index 0000000000..4d91cd5ba5
--- /dev/null
+++ b/bsp/microchip/same54/SConstruct
@@ -0,0 +1,41 @@
+import os
+import sys
+import rtconfig
+
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../../..')
+
+sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
+try:
+    from building import *
+except:
+    print('Cannot found RT-Thread root directory, please check RTT_ROOT')
+    print(RTT_ROOT)
+    exit(-1)
+
+TARGET = 'rt-thread-' + rtconfig.DEVICE_PART + '.' + rtconfig.TARGET_EXT
+
+DefaultEnvironment(tools=[])
+env = Environment(tools = ['mingw'],
+    AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
+    CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
+    AR = rtconfig.AR, ARFLAGS = '-rc',
+    CXX = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
+    LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
+env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
+
+if rtconfig.PLATFORM == 'iar':
+    env.Replace(CCCOM = ['$CC $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS -o $TARGET $SOURCES'])
+    env.Replace(ARFLAGS = [''])
+    env.Replace(LINKCOM = env["LINKCOM"] + ' --map rt-thread-'+ rtconfig.DEVICE_PART + '.map')
+
+Export('RTT_ROOT')
+Export('rtconfig')
+
+# prepare building environment
+objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=False)
+
+# make a building
+DoBuilding(TARGET, objs)