Merge tag 'v1.9.1' into parse-bytecode

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, 7 insertions, 4 deletions

diff --git a/zephyr/machine_pin.c b/zephyr/machine_pin.c
index f011f51fd3..38971399cc 100644
--- a/zephyr/machine_pin.c
+++ b/zephyr/machine_pin.c
@@ -117,7 +117,7 @@ STATIC mp_obj_t machine_pin_call(mp_obj_t self_in, size_t n_args, size_t n_kw, c
     mp_arg_check_num(n_args, n_kw, 0, 1, false);
     machine_pin_obj_t *self = self_in;
     if (n_args == 0) {
-        uint32_t pin_val;
+        u32_t pin_val;
         (void)gpio_pin_read(self->port, self->pin, &pin_val);
         return MP_OBJ_NEW_SMALL_INT(pin_val);
     } else {
@@ -158,7 +158,7 @@ STATIC mp_uint_t machine_pin_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_
 
     switch (request) {
         case MP_PIN_READ: {
-            uint32_t pin_val;
+            u32_t pin_val;
             gpio_pin_read(self->port, self->pin, &pin_val);
             return pin_val;
         }
diff --git a/zephyr/modusocket.c b/zephyr/modusocket.c
index 0a54ea576c..cec0eec7c4 100644
--- a/zephyr/modusocket.c
+++ b/zephyr/modusocket.c
@@ -587,7 +587,8 @@ STATIC mp_obj_t mod_getaddrinfo(size_t n_args, const mp_obj_t *args) {
 
     // Raise error only if there's nothing to return, otherwise
     // it may be IPv4 vs IPv6 differences.
-    if (state.status != 0 && mp_obj_len(state.result) == 0) {
+    mp_int_t len = MP_OBJ_SMALL_INT_VALUE(mp_obj_len(state.result));
+    if (state.status != 0 && len == 0) {
         mp_raise_OSError(state.status);
     }
 
diff --git a/zephyr/modutime.c b/zephyr/modutime.c
index 378068bb38..0c268046a9 100644
--- a/zephyr/modutime.c
+++ b/zephyr/modutime.c
@@ -36,7 +36,7 @@
 #include "extmod/utime_mphal.h"
 
 STATIC mp_obj_t mod_time_time(void) {
-    /* The absense of FP support is deliberate. The Zephyr port uses
+    /* The absence of FP support is deliberate. The Zephyr port uses
      * single precision floats so the fraction component will start to
      * lose precision on devices with a long uptime.
      */
diff --git a/zephyr/mpconfigport.h b/zephyr/mpconfigport.h
index 98a033be46..2f25267795 100644
--- a/zephyr/mpconfigport.h
+++ b/zephyr/mpconfigport.h
@@ -80,6 +80,8 @@
 #define MICROPY_COMP_CONST (0)
 #define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (0)
 
+#define MICROPY_PY_SYS_PLATFORM "zephyr"
+
 #ifdef CONFIG_BOARD
 #define MICROPY_HW_BOARD_NAME "zephyr-" CONFIG_BOARD
 #else