Signed-off-by: Nzilin.zxl <zilin.zxl@alibaba-inc.com>

- Use printk instead of printf in mm critical region, otherwise, system
  will crash, specially in SMP system.

- Remove "0x" prefix before "%p", "0x" is redundant for "%p".

[Detail]
hal_uart_recv_II returns 0 if no data received, instead of returning EIO.

[Verified Cases]
Build Pass: eduk1_demo
Test Pass: eduk1_demo

[Detail]
Issue description:

Rootcause:

Solution:

Requirement description:

Solution:

[Verified Cases]
Build Pass: <solution list>
Test Pass: <test case list>
Signed-off-by: Nwzhiyuan-nit <wuming.wzy@alibaba-inc.com>

IssueID:1815:decrease mp_stack, queue_handler, gui , ota, and linksdk thread stack size and optimise memory layout statics.

[Detail]
on m5stackcore2, with lvgl, linksdk, online update all on,mp_stack stack remains still 3636
when set from 16KB to 8KB.
on m5stackcore2, with lvgl, linksdk, online update all on,queue_handler stack remains still 1776
when set from 8KB to 3KB.
on m5stackcore2, user logic is placed on mp_task, so mqtt_rec's stack remains 1676 should be enough.
mqtt_process only process repub, hearbeat and some event, on m5stackcore2, mqtt_process's stack
remains 1504 should be enough.
for arm and xtensa, stack should be enough based on current sitution
but for esp32_c3 riscv, due to c11 tls, every stack will have another 1KB space, needs to remove it.

[Verified Cases]
Build Pass: <py_engine_esp32_demo>
Test Pass: <py_engine_esp32_demo>

[Detail]
to open bt on nodemcu32s, need to do things as below.
import kv
kv.set("disable_bt", "no")
然后重启设备

[Verified Cases]
Build Pass: <none>
Test Pass: <none>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

[Detail]
Issue description:

Rootcause:

Solution:

Requirement description:

Solution:

[Verified Cases]
Build Pass: <solution list>
Test Pass: <test case list>
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

[Detail]
when CONFIG_FREERTOS_INTERRUPT_BACKTRACE opens, XT_DEBUG_BACKTRACE will open.
opening XT_DEBUG_BACKTRACE can backtrace interrupt callchain of thread context although it usually
useless, but it EXCSAVEx register. if normal exception occurs, which also uses EXCSAVEx register,
        and having tail interrupt after current isr, it will crush EXCSAVEx, then system will crash.
        so based on above, close CONFIG_FREERTOS_INTERRUPT_BACKTRACE.

[Verified Cases]
Build Pass: none
Test Pass: none

[Detail]
improve lwip options to fix http test faults

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

* modify HaaSPython's brief introduction, fix #1772
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add HaaS Python v2.2.0 release notest, fix #1726
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add chapter index for examples, fix #1800
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* modify HaaSPython's brief introduction, fix #1772
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add HaaS Python v2.2.0 release notest, fix #1726
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add README for HaaS EDU K1 examples, fix #1798
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* modify HaaSPython's brief introduction, fix #1772
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

* add HaaS Python v2.2.0 release notest, fix #1726
Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

[Detail]
Fix documentation on UART API: on()
Improve examples in UART doc.

[Verified Cases]
Build Pass: None
Test Pass: None

[Detail]
Workaround for ethernet spi hardware to prevent dead loops.

[Verified Cases]
Build Pass: <helloworld_demo@haas100>
Test Pass: <helloworld_demo@haas100>

[Detail]
The CH395 ethernet chip on board is unstable for some reason.
Workaround for stable ethernet connection.

[Verified Cases]
Build Pass: <helloworld_demo@haas100>
Test Pass: <helloworld_demo@haas100>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

Use localtime/localtime_r and env apis in newlib libc, and remove
duplicate implementation in posix and newlib_stub_uspace.
Signed-off-by: NJinliang Li <ljl150821@alibaba-inc.com>

Signed-off-by: Nethan.lcz <ethan.lcz@alibaba-inc.com>

[Detail]
only for haas200 and haaseduk1.

[Verified Cases]
Build Pass: <none>
Test Pass: <none>

Change-Id: Ia8906bd90d52dc67b995a1ad8631d4ee606d83ce

Issue id: #1763 add security_monitoring_system demo
Solution: when megnetic sensor is triggered,buzzer will make sound and camera will caputure image and upload to the iot platform.we can monitor the system on mobile app.

Change-Id: Ia128f04aa362ed6be8cb9af7e7227a1607ae3bd4

[Detail]
remove duplicate \r\n in haas200 log

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

[Detail]
add pthread_mutex_timedlock's declaration

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

[Detail]
Issue description:

Rootcause:

Solution:

Requirement description:

Solution:

[Verified Cases]
Build Pass: <solution list>
Test Pass: <test case list>
Signed-off-by: Nwzhiyuan-nit <wuming.wzy@alibaba-inc.com>

An enum-typed expression is used in a Boolean conditional context. The
enum type does not appear to have a distinguished false (zero) value.

Change the type as int to fix such issue.

[Detail]
fix build issue in debug lastword

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

[Detail]
Debug cli command prints cpu_binded/cpu_num/cpu_exec information on
multi-core cpu.

[Verified Cases]
Build Pass: <py_engine_demo>
Test Pass:  <py_engine_demo>

[Detail]
none

[Verified Cases]
Build Pass: <py_engine_esp32_demo>
Test Pass: <py_engine_esp32_demo>