Merge tag 'v1.9.1'2.0.0-alpha.0

Fixes for stmhal USB mass storage, lwIP bindings and VFS regressions

This release provides an important fix for the USB mass storage device in
the stmhal port by implementing the SCSI SYNCHRONIZE_CACHE command, which
is now require by some Operating Systems.  There are also fixes for the
lwIP bindings to improve non-blocking sockets and error codes.  The VFS has
some regressions fixed including the ability to statvfs the root.

All changes are listed below.

py core:
- modbuiltins: add core-provided version of input() function
- objstr: catch case of negative "maxsplit" arg to str.rsplit()
- persistentcode: allow to compile with complex numbers disabled
- objstr: allow to compile with obj-repr D, and unicode disabled
- modsys: allow to compile with obj-repr D and PY_ATTRTUPLE disabled
- provide mp_decode_uint_skip() to help reduce stack usage
- makeqstrdefs.py: make script run correctly with Python 2.6
- objstringio: if created from immutable object, follow copy on write policy

extmod:
- modlwip: connect: for non-blocking mode, return EINPROGRESS
- modlwip: fix error codes for duplicate calls to connect()
- modlwip: accept: fix error code for non-blocking mode
- vfs: allow to statvfs the root directory
- vfs: allow "buffering" and "encoding" args to VFS's open()
- modframebuf: fix signed/unsigned comparison pendantic warning

lib:
- libm: use isfinite instead of finitef, for C99 compatibility
- utils/interrupt_char: remove support for KBD_EXCEPTION disabled

tests:
- basics/string_rsplit: add tests for negative "maxsplit" argument
- float: convert "sys.exit()" to "raise SystemExit"
- float/builtin_float_minmax: PEP8 fixes
- basics: convert "sys.exit()" to "raise SystemExit"
- convert remaining "sys.exit()" to "raise SystemExit"

unix port:
- convert to use core-provided version of built-in import()
- Makefile: replace references to make with $(MAKE)

windows port:
- convert to use core-provided version of built-in import()

qemu-arm port:
- Makefile: adjust object-file lists to get correct dependencies
- enable micropython.mem_*() functions to allow more tests

stmhal port:
- boards: enable DAC for NUCLEO_F767ZI board
- add support for NUCLEO_F446RE board
- pass USB handler as parameter to allow more than one USB handler
- usb: use local USB handler variable in Start-of-Frame handler
- usb: make state for USB device private to top-level USB driver
- usbdev: for MSC implement SCSI SYNCHRONIZE_CACHE command
- convert from using stmhal's input() to core provided version

cc3200 port:
- convert from using stmhal's input() to core provided version

teensy port:
- convert from using stmhal's input() to core provided version

esp8266 port:
- Makefile: replace references to make with $(MAKE)
- Makefile: add clean-modules target
- convert from using stmhal's input() to core provided version

zephyr port:
- modusocket: getaddrinfo: Fix mp_obj_len() usage
- define MICROPY_PY_SYS_PLATFORM (to "zephyr")
- machine_pin: use native Zephyr types for Zephyr API calls

docs:
- machine.Pin: remove out_value() method
- machine.Pin: add on() and off() methods
- esp8266: consistently replace Pin.high/low methods with .on/off
- esp8266/quickref: polish Pin.on()/off() examples
- network: move confusingly-named cc3200 Server class to its reference
- uos: deconditionalize, remove minor port-specific details
- uos: move cc3200 port legacy VFS mounting functions to its ref doc
- machine: sort machine classes in logical order, not alphabetically
- network: first step to describe standard network class interface

examples:
- embedding: use core-provided KeyboardInterrupt object

4 files changed, 24 insertions, 26 deletions

diff --git a/examples/embedding/Makefile.upylib b/examples/embedding/Makefile.upylib
index d8dbade3f..4663ad30a 100644
--- a/examples/embedding/Makefile.upylib
+++ b/examples/embedding/Makefile.upylib
@@ -14,13 +14,12 @@ INC +=  -I.
 INC +=  -I..
 INC +=  -I$(MPTOP)
 INC +=  -I$(MPTOP)/unix
-#INC += -I../lib/timeutils
 INC += -I$(BUILD)
 
 # compiler settings
 CWARN = -Wall -Werror
 CWARN += -Wpointer-arith -Wuninitialized
-CFLAGS = $(INC) $(CWARN) -ansi -std=gnu99 -DUNIX $(CFLAGS_MOD) $(COPT) $(CFLAGS_EXTRA)
+CFLAGS = $(INC) $(CWARN) -std=gnu99 -DUNIX $(CFLAGS_MOD) $(COPT) $(CFLAGS_EXTRA)
 
 # Debugging/Optimization
 ifdef DEBUG
@@ -171,7 +170,7 @@ SRC_QSTR_AUTO_DEPS +=
 include $(MPTOP)/py/mkrules.mk
 
 # Value of configure's --host= option (required for cross-compilation).
-# Deduce it from CROSS_COMPILE by default, but can be overriden.
+# Deduce it from CROSS_COMPILE by default, but can be overridden.
 ifneq ($(CROSS_COMPILE),)
 CROSS_COMPILE_HOST = --host=$(patsubst %-,%,$(CROSS_COMPILE))
 else
diff --git a/examples/embedding/README b/examples/embedding/README.md
index 0475e8739..804dfede6 100644
--- a/examples/embedding/README
+++ b/examples/embedding/README.md
@@ -11,46 +11,47 @@ Python statement which prints to the standard output.
 Building the example
 --------------------
 
-Build the example is as simple as running:
+Building the example is as simple as running:
 
     make
 
 It's worth to trace what's happening behind the scenes though:
 
 1. As a first step, a MicroPython library is built. This is handled by a
-seperate makefile, Makefile.upylib. It is more or less complex, but the
+separate makefile, Makefile.upylib. It is more or less complex, but the
 good news is that you won't need to change anything in it, just use it
-as is, the main Makefile shows how. What may need editing though is
-MicroPython configuration file. MicroPython is highly configurable, so
+as is, the main Makefile shows how. What may require editing though is
+a MicroPython configuration file. MicroPython is highly configurable, so
 you would need to build a library suiting your application well, while
 not bloating its size. Check the options in the file "mpconfigport.h".
-Included is a copy of "minimal" Unix port, which should be good start
-for minimal embedding. For list of all available options, see py/mpconfig.h.
+Included is a copy of the "minimal" Unix port, which should be a good start
+for minimal embedding. For the list of all available options, see
+py/mpconfig.h.
 
-2. Once the library is built, your application is compiled and linked with
-the MicroPython library produced in the previous step. The main Makefile
-is very simple and shows that changes you would need to do to your
-application's Makefile (or other build configuration) are also simple:
+2. Once the MicroPython library is built, your application is compiled
+and linked it. The main Makefile is very simple and shows that the changes
+you would need to do to your application's Makefile (or other build
+configuration) are also simple:
 
-a) You would need to use C99 standard (you're using 15+ years old standard
-already, not a 25+ years old one, right?).
+a) You would need to use C99 standard (you're using this 15+ years old
+standard already, not a 25+ years old one, right?).
 
-b) You need to provide path to MicroPython's top-level dir, for includes.
+b) You need to provide a path to MicroPython's top-level dir, for includes.
 
 c) You need to include -DNO_QSTR compile-time flag.
 
-d) Otherwise, just link with micropython library produced in step 1.
+d) Otherwise, just link with the MicroPython library produced in step 1.
 
 
 Out of tree build
 -----------------
 
-This example set up to work out of the box, being part of the MicroPython
+This example is set up to work out of the box, being part of the MicroPython
 tree. Your application of course will be outside of its tree, but the
 only thing you need to do is to pass MPTOP variable pointing to
 MicroPython directory to both Makefiles (in this example, the main Makefile
-automatically pass it to Makefile.upylib; in your own Makefile, don't forget
-to use suitable value).
+automatically passes it to Makefile.upylib; in your own Makefile, don't forget
+to use a suitable value).
 
 A practical way to embed MicroPython in your application is to include it
 as a git submodule. Suppose you included it as libs/micropython. Then in
diff --git a/examples/embedding/hello-embed.c b/examples/embedding/hello-embed.c
index 194930518..e3a484783 100644
--- a/examples/embedding/hello-embed.c
+++ b/examples/embedding/hello-embed.c
@@ -35,9 +35,10 @@
 
 static char heap[16384];
 
-mp_obj_t execute_from_lexer(mp_lexer_t *lex) {
+mp_obj_t execute_from_str(const char *str) {
     nlr_buf_t nlr;
     if (nlr_push(&nlr) == 0) {
+        mp_lexer_t *lex = mp_lexer_new_from_str_len(0/*MP_QSTR_*/, str, strlen(str), false);
         mp_parse_tree_t pt = mp_parse(lex, MP_PARSE_FILE_INPUT);
         mp_obj_t module_fun = mp_compile(&pt, lex->source_name, MP_EMIT_OPT_NONE, false);
         mp_call_function_0(module_fun);
@@ -58,8 +59,7 @@ int main() {
     mp_init();
 
     const char str[] = "print('Hello world of easy embedding!')";
-    mp_lexer_t *lex = mp_lexer_new_from_str_len(0/*MP_QSTR_*/, str, strlen(str), false);
-    if (execute_from_lexer(lex)) {
+    if (execute_from_str(str)) {
         printf("Error\n");
     }
 }
diff --git a/examples/embedding/mpconfigport_minimal.h b/examples/embedding/mpconfigport_minimal.h
index 48d200858..87c87fa97 100644
--- a/examples/embedding/mpconfigport_minimal.h
+++ b/examples/embedding/mpconfigport_minimal.h
@@ -34,6 +34,7 @@
 #define MICROPY_MEM_STATS           (0)
 #define MICROPY_DEBUG_PRINTERS      (0)
 #define MICROPY_READER_POSIX        (1)
+#define MICROPY_KBD_EXCEPTION       (1)
 #define MICROPY_HELPER_REPL         (1)
 #define MICROPY_HELPER_LEXER_UNIX   (1)
 #define MICROPY_ENABLE_SOURCE_LINE  (0)
@@ -91,7 +92,6 @@ extern const struct _mp_obj_module_t mp_module_os;
     { MP_OBJ_NEW_QSTR(MP_QSTR_uos), (mp_obj_t)&mp_module_os }, \
 
 #define MICROPY_PORT_ROOT_POINTERS \
-    mp_obj_t keyboard_interrupt_obj;
 
 //////////////////////////////////////////
 // Do not change anything beyond this line
@@ -119,8 +119,6 @@ typedef int mp_int_t; // must be pointer size
 typedef unsigned int mp_uint_t; // must be pointer size
 #endif
 
-#define BYTES_PER_WORD sizeof(mp_int_t)
-
 // Cannot include <sys/types.h>, as it may lead to symbol name clashes
 #if _FILE_OFFSET_BITS == 64 && !defined(__LP64__)
 typedef long long mp_off_t;