Update Micropython to 1.9.3 + added LittleFS

Synchronized with MicroPython (at the state of the following commit: micropython/micropython@23e9c3b )
plus introduced Little Fs on /flash.

Main points of the update:

File system handling updated to use the Virtual File System concept, including:

Replaced the Fat Fs on /flash to Little Fs
SD class is extended with the APIs needed by the VFS, so the SD card can be mounted/formatted as FatFs
ftp.c is updated so it can handle LittleFs on /flash and FatFs on the SD card
Block device handling of LittleFs uses "blocks" while FatFs uses "sectors". A block consists of 8 sectors. On both file system a file occupies at least 1 block/1 sector. This means the total number of files which can be created on LittleFs is ~1/8 of the total number of files on FatFs. This change is needed to be able to have the advantage of the LittleFs power-loss resilience property.

Beyond File system related changes:

All ports except esp32 are moved into folder "ports"
IOCTL is replaced with STREAM (pybioctl.h -> py/stream.h)
extmod, lib, mpy-cross, py, tests, drivers and tools folders are synchronized with MicroPython repository
timeutils.c/h updated because new functions with the same names come with the update by MicroPython
kbd_exception creation is now compeletely handled by common functions in MicroPython source
moduos.c is completely rewritten using the VFS functions
"readall()" APIs of classes are removed (originates from MicroPython), the read() function (without parameters) does the same
New submodule added: stm32lib
tests/esp32/alarm.py updated to be more reliable...
not ESP32 specific tests are rechecked

Author: iwahdan88

.gitmodules

@@ -7,7 +7,11 @@
 	url = https://github.com/atgreen/libffi
 [submodule "lib/lwip"]
 	path = lib/lwip
-	url = http://git.savannah.gnu.org/r/lwip.git
+	url = https://git.savannah.gnu.org/r/lwip.git
 [submodule "lib/berkeley-db-1.xx"]
 	path = lib/berkeley-db-1.xx
 	url = https://github.com/pfalcon/berkeley-db-1.xx
+[submodule "lib/stm32lib"]
+	path = lib/stm32lib
+	url = https://github.com/micropython/stm32lib
+	branch = work-F4-1.16.0+F7-1.7.0+L4-1.8.1

drivers/bus/qspi.h

@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2018 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H
+#define MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H
+
+#include "py/mphal.h"
+
+enum {
+    MP_QSPI_IOCTL_INIT,
+    MP_QSPI_IOCTL_DEINIT,
+    MP_QSPI_IOCTL_BUS_ACQUIRE,
+    MP_QSPI_IOCTL_BUS_RELEASE,
+};
+
+typedef struct _mp_qspi_proto_t {
+    int (*ioctl)(void *self, uint32_t cmd);
+    void (*write_cmd_data)(void *self, uint8_t cmd, size_t len, uint32_t data);
+    void (*write_cmd_addr_data)(void *self, uint8_t cmd, uint32_t addr, size_t len, const uint8_t *src);
+    uint32_t (*read_cmd)(void *self, uint8_t cmd, size_t len);
+    void (*read_cmd_qaddr_qdata)(void *self, uint8_t cmd, uint32_t addr, size_t len, uint8_t *dest);
+} mp_qspi_proto_t;
+
+typedef struct _mp_soft_qspi_obj_t {
+    mp_hal_pin_obj_t cs;
+    mp_hal_pin_obj_t clk;
+    mp_hal_pin_obj_t io0;
+    mp_hal_pin_obj_t io1;
+    mp_hal_pin_obj_t io2;
+    mp_hal_pin_obj_t io3;
+} mp_soft_qspi_obj_t;
+
+extern const mp_qspi_proto_t mp_soft_qspi_proto;
+
+#endif // MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H

drivers/bus/softqspi.c

@@ -0,0 +1,203 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2018 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "drivers/bus/qspi.h"
+
+#define CS_LOW(self) mp_hal_pin_write(self->cs, 0)
+#define CS_HIGH(self) mp_hal_pin_write(self->cs, 1)
+
+#ifdef MICROPY_HW_SOFTQSPI_SCK_LOW
+
+// Use externally provided functions for SCK control and IO reading
+#define SCK_LOW(self) MICROPY_HW_SOFTQSPI_SCK_LOW(self)
+#define SCK_HIGH(self) MICROPY_HW_SOFTQSPI_SCK_HIGH(self)
+#define NIBBLE_READ(self) MICROPY_HW_SOFTQSPI_NIBBLE_READ(self)
+
+#else
+
+// Use generic pin functions for SCK control and IO reading
+#define SCK_LOW(self) mp_hal_pin_write(self->clk, 0)
+#define SCK_HIGH(self) mp_hal_pin_write(self->clk, 1)
+#define NIBBLE_READ(self) ( \
+    mp_hal_pin_read(self->io0) \
+    | (mp_hal_pin_read(self->io1) << 1) \
+    | (mp_hal_pin_read(self->io2) << 2) \
+    | (mp_hal_pin_read(self->io3) << 3))
+
+#endif
+
+STATIC void nibble_write(mp_soft_qspi_obj_t *self, uint8_t v) {
+    mp_hal_pin_write(self->io0, v & 1);
+    mp_hal_pin_write(self->io1, (v >> 1) & 1);
+    mp_hal_pin_write(self->io2, (v >> 2) & 1);
+    mp_hal_pin_write(self->io3, (v >> 3) & 1);
+}
+
+STATIC int mp_soft_qspi_ioctl(void *self_in, uint32_t cmd) {
+    mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
+
+    switch (cmd) {
+        case MP_QSPI_IOCTL_INIT:
+            mp_hal_pin_high(self->cs);
+            mp_hal_pin_output(self->cs);
+
+            // Configure pins
+            mp_hal_pin_write(self->clk, 0);
+            mp_hal_pin_output(self->clk);
+            //mp_hal_pin_write(self->clk, 1);
+            mp_hal_pin_output(self->io0);
+            mp_hal_pin_input(self->io1);
+            mp_hal_pin_write(self->io2, 1);
+            mp_hal_pin_output(self->io2);
+            mp_hal_pin_write(self->io3, 1);
+            mp_hal_pin_output(self->io3);
+            break;
+    }
+
+    return 0; // success
+}
+
+STATIC void mp_soft_qspi_transfer(mp_soft_qspi_obj_t *self, size_t len, const uint8_t *src, uint8_t *dest) {
+    // Will run as fast as possible, limited only by CPU speed and GPIO time
+    mp_hal_pin_input(self->io1);
+    mp_hal_pin_output(self->io0);
+    if (self->io3) {
+        mp_hal_pin_write(self->io2, 1);
+        mp_hal_pin_output(self->io2);
+        mp_hal_pin_write(self->io3, 1);
+        mp_hal_pin_output(self->io3);
+    }
+    if (src) {
+        for (size_t i = 0; i < len; ++i) {
+            uint8_t data_out = src[i];
+            uint8_t data_in = 0;
+            for (int j = 0; j < 8; ++j, data_out <<= 1) {
+                mp_hal_pin_write(self->io0, (data_out >> 7) & 1);
+                mp_hal_pin_write(self->clk, 1);
+                data_in = (data_in << 1) | mp_hal_pin_read(self->io1);
+                mp_hal_pin_write(self->clk, 0);
+            }
+            if (dest != NULL) {
+                dest[i] = data_in;
+            }
+        }
+    } else {
+        for (size_t i = 0; i < len; ++i) {
+            uint8_t data_in = 0;
+            for (int j = 0; j < 8; ++j) {
+                mp_hal_pin_write(self->clk, 1);
+                data_in = (data_in << 1) | mp_hal_pin_read(self->io1);
+                mp_hal_pin_write(self->clk, 0);
+            }
+            if (dest != NULL) {
+                dest[i] = data_in;
+            }
+        }
+    }
+}
+
+STATIC void mp_soft_qspi_qread(mp_soft_qspi_obj_t *self, size_t len, uint8_t *buf) {
+    // Make all IO lines input
+    mp_hal_pin_input(self->io2);
+    mp_hal_pin_input(self->io3);
+    mp_hal_pin_input(self->io0);
+    mp_hal_pin_input(self->io1);
+
+    // Will run as fast as possible, limited only by CPU speed and GPIO time
+    while (len--) {
+        SCK_HIGH(self);
+        uint8_t data_in = NIBBLE_READ(self);
+        SCK_LOW(self);
+        SCK_HIGH(self);
+        *buf++ = (data_in << 4) | NIBBLE_READ(self);
+        SCK_LOW(self);
+    }
+}
+
+STATIC void mp_soft_qspi_qwrite(mp_soft_qspi_obj_t *self, size_t len, const uint8_t *buf) {
+    // Make all IO lines output
+    mp_hal_pin_output(self->io2);
+    mp_hal_pin_output(self->io3);
+    mp_hal_pin_output(self->io0);
+    mp_hal_pin_output(self->io1);
+
+    // Will run as fast as possible, limited only by CPU speed and GPIO time
+    for (size_t i = 0; i < len; ++i) {
+        nibble_write(self, buf[i] >> 4);
+        SCK_HIGH(self);
+        SCK_LOW(self);
+
+        nibble_write(self, buf[i]);
+        SCK_HIGH(self);
+        SCK_LOW(self);
+    }
+
+    //mp_hal_pin_input(self->io1);
+}
+
+STATIC void mp_soft_qspi_write_cmd_data(void *self_in, uint8_t cmd, size_t len, uint32_t data) {
+    mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
+    uint32_t cmd_buf = cmd | data << 8;
+    CS_LOW(self);
+    mp_soft_qspi_transfer(self, 1 + len, (uint8_t*)&cmd_buf, NULL);
+    CS_HIGH(self);
+}
+
+STATIC void mp_soft_qspi_write_cmd_addr_data(void *self_in, uint8_t cmd, uint32_t addr, size_t len, const uint8_t *src) {
+    mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
+    uint8_t cmd_buf[4] = {cmd, addr >> 16, addr >> 8, addr};
+    CS_LOW(self);
+    mp_soft_qspi_transfer(self, 4, cmd_buf, NULL);
+    mp_soft_qspi_transfer(self, len, src, NULL);
+    CS_HIGH(self);
+}
+
+STATIC uint32_t mp_soft_qspi_read_cmd(void *self_in, uint8_t cmd, size_t len) {
+    mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
+    uint32_t cmd_buf = cmd;
+    CS_LOW(self);
+    mp_soft_qspi_transfer(self, 1 + len, (uint8_t*)&cmd_buf, (uint8_t*)&cmd_buf);
+    CS_HIGH(self);
+    return cmd_buf >> 8;
+}
+
+STATIC void mp_soft_qspi_read_cmd_qaddr_qdata(void *self_in, uint8_t cmd, uint32_t addr, size_t len, uint8_t *dest) {
+    mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
+    uint8_t cmd_buf[7] = {cmd, addr >> 16, addr >> 8, addr};
+    CS_LOW(self);
+    mp_soft_qspi_transfer(self, 1, cmd_buf, NULL);
+    mp_soft_qspi_qwrite(self, 6, &cmd_buf[1]); // 3 addr bytes, 1 extra byte (0), 2 dummy bytes (4 dummy cycles)
+    mp_soft_qspi_qread(self, len, dest);
+    CS_HIGH(self);
+}
+
+const mp_qspi_proto_t mp_soft_qspi_proto = {
+    .ioctl = mp_soft_qspi_ioctl,
+    .write_cmd_data = mp_soft_qspi_write_cmd_data,
+    .write_cmd_addr_data = mp_soft_qspi_write_cmd_addr_data,
+    .read_cmd = mp_soft_qspi_read_cmd,
+    .read_cmd_qaddr_qdata = mp_soft_qspi_read_cmd_qaddr_qdata,
+};

drivers/bus/softspi.c

@@ -0,0 +1,105 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2018 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "drivers/bus/spi.h"
+
+int mp_soft_spi_ioctl(void *self_in, uint32_t cmd) {
+    mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
+
+    switch (cmd) {
+        case MP_SPI_IOCTL_INIT:
+            mp_hal_pin_write(self->sck, self->polarity);
+            mp_hal_pin_output(self->sck);
+            mp_hal_pin_output(self->mosi);
+            mp_hal_pin_input(self->miso);
+            break;
+
+        case MP_SPI_IOCTL_DEINIT:
+            break;
+    }
+
+    return 0;
+}
+
+void mp_soft_spi_transfer(void *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
+    mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
+    uint32_t delay_half = self->delay_half;
+
+    // only MSB transfer is implemented
+
+    // If a port defines MICROPY_HW_SOFTSPI_MIN_DELAY, and the configured
+    // delay_half is equal to this value, then the software SPI implementation
+    // will run as fast as possible, limited only by CPU speed and GPIO time.
+    #ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
+    if (delay_half == MICROPY_HW_SOFTSPI_MIN_DELAY) {
+        for (size_t i = 0; i < len; ++i) {
+            uint8_t data_out = src[i];
+            uint8_t data_in = 0;
+            for (int j = 0; j < 8; ++j, data_out <<= 1) {
+                mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
+                mp_hal_pin_write(self->sck, 1 - self->polarity);
+                data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
+                mp_hal_pin_write(self->sck, self->polarity);
+            }
+            if (dest != NULL) {
+                dest[i] = data_in;
+            }
+        }
+        return;
+    }
+    #endif
+
+    for (size_t i = 0; i < len; ++i) {
+        uint8_t data_out = src[i];
+        uint8_t data_in = 0;
+        for (int j = 0; j < 8; ++j, data_out <<= 1) {
+            mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
+            if (self->phase == 0) {
+                mp_hal_delay_us_fast(delay_half);
+                mp_hal_pin_write(self->sck, 1 - self->polarity);
+            } else {
+                mp_hal_pin_write(self->sck, 1 - self->polarity);
+                mp_hal_delay_us_fast(delay_half);
+            }
+            data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
+            if (self->phase == 0) {
+                mp_hal_delay_us_fast(delay_half);
+                mp_hal_pin_write(self->sck, self->polarity);
+            } else {
+                mp_hal_pin_write(self->sck, self->polarity);
+                mp_hal_delay_us_fast(delay_half);
+            }
+        }
+        if (dest != NULL) {
+            dest[i] = data_in;
+        }
+    }
+}
+
+const mp_spi_proto_t mp_soft_spi_proto = {
+    .ioctl = mp_soft_spi_ioctl,
+    .transfer = mp_soft_spi_transfer,
+};