8000 mimxrt: Add a simple mimxrt.usb_mode() method. · micropython/micropython@43f8bae · GitHub
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mimxrt: Add a simple mimxrt.usb_mode() method.
To enble/disable MSC at boot time. The calls are a simplified version if pyb.usb_mode(): mimxrt.usb_mode(modestr) with modestr being either "vcp" or "vcp+msc". The call has to be placed in boot.py and requires a hard reset to get effective, since tusb_init() is executed only once after reset.
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‎docs/mimxrt/quickref.rst

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@@ -537,6 +537,36 @@ port and LAN(1) for the 1G port.
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For details of the network interface refer to the class :ref:`network.LAN <network.LAN>`.
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External drive mode
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-------------------
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On some boards a mode is enabled, that mounts the board's internal file system as
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external USB drive, called MSC support. Data of that drive can be accessed and changed by the PC.
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In that state, access to the internal drive by the MicroPython is limited to
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readonly mode, avoiding file corruption. Changes made by the PC to the file system may not be visible
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at the board until the drive is ejected by the PC or a soft reset of the board
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is made.
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To enable write access to by the board, eject the drive at the PC **and** perform
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a soft-reset on the board, either by pushing Ctrl-D at REPL or calling machine.soft_reset().
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The external drive mode can be enabled of disabled by calling mimxrt.usb_mode(). Examples::
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# disable MSC support
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import mimxrt
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mimxrt.usb_mode("vcp")
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::
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# enable MSC support
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import mimxrt
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mimxrt.usb_mode("vcp+msc") # enable VCP and MSC support
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These command must be placed into boot.py. They get effective after the next hard reset or
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power cycle.
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Transferring files
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------------------
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‎ports/mimxrt/main.c

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -85,16 +85,15 @@ int main(void) {
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// Execute _boot.py to set up the filesystem.
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pyexec_frozen_module("_boot.py");
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// deferred tusb_init allowing a fs to be created before MSC access
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if (!tusb_inited()) {
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tusb_init();
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}
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// Execute user scripts.
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int ret = pyexec_file_if_exists("boot.py");
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if (ret & PYEXEC_FORCED_EXIT) {
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goto soft_reset_exit;
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}
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// deferred tusb_init allowing a fs to be created before MSC access
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tusb_init();
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// Do not execute main.py if boot.py failed
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if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
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ret = pyexec_file_if_exists("main.py");

‎ports/mimxrt/modmimxrt.c

Lines changed: 24 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -29,12 +29,35 @@
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#include "drivers/dht/dht.h"
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#include "modmimxrt.h"
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#if MICROPY_HW_USB_MSC
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#define USB_MODE_VCP "vcp"
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#define USB_MODE_VCP_MSC "vcp+msc"
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extern void set_msc_enabled(bool state);
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STATIC mp_obj_t mimxrt_usb_mode(mp_obj_t mode_in) {
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size_t slen;
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const char *s = mp_obj_str_get_data(mode_in, &slen);
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if (strncmp(s, USB_MODE_VCP, slen) == 0) {
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set_msc_enabled(false);
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} else if (strncmp(s, USB_MODE_VCP_MSC, slen) == 0) {
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set_msc_enabled(true);
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} else {
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mp_raise_ValueError("Invalid usb_mode");
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(mimxrt_usb_mode_obj, mimxrt_usb_mode);
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#endif
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STATIC const mp_rom_map_elem_t mimxrt_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_mimxrt) },
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{ MP_ROM_QSTR(MP_QSTR_Flash), MP_ROM_PTR(&mimxrt_flash_type) },
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{ MP_ROM_QSTR(MP_QSTR_dht_readinto), MP_ROM_PTR(&dht_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_dht_readinto), MP_ROM_PTR(&dht_readinto_obj) },
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#if MICROPY_HW_USB_MSC
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{ MP_ROM_QSTR(MP_QSTR_usb_mode), MP_ROM_PTR(&mimxrt_usb_mode_obj) },
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{ MP_ROM_QSTR(MP_QSTR_MSC), MP_ROM_INT(1) },
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#endif
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};

‎ports/mimxrt/modules/_boot.py

Lines changed: 10 additions & 11 deletions
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Original file line numberDiff line numberDiff line change
@@ -25,28 +25,27 @@ def fs_type(bdev):
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bdev = mimxrt.Flash()
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# In case of MSC support mount as FAT
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# Create a FAT FS if needed
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if hasattr(mimxrt, "MSC"):
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# try to mount the fs accorfing to the boot sector
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# if that fails, (re-)create it with a preference for FAT on
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# boards with MSC support.
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fs = fs_type(bdev)
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if fs == FS_FAT or (fs == FS_UNDEF and hasattr(mimxrt, "MSC")):
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try:
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vfs = os.VfsFat(bdev)
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os.mount(vfs, "/flash")
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except:
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os.VfsFat.mkfs(bdev)
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vfs = os.VfsFat(bdev)
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os.mount(vfs, "/flash")
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# otherwise analyze the boot sector an mount accordingly
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# without a valid boot sector create a LFS file system
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else:
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fs = fs_type(bdev)
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if fs == FS_LITTLEFS:
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try:
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vfs = os.VfsLfs2(bdev, progsize=256)
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elif fs == FS_FAT:
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vfs = os.VfsFat(bdev)
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else:
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os.mount(vfs, "/flash")
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except:
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os.VfsLfs2.mkfs(bdev, progsize=256)
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vfs = os.VfsLfs2(bdev, progsize=256)
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os.mount(vfs, "/flash")
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os.mount(vfs, "/flash")
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os.chdir("/flash")
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sys.path.append("/flash")

‎ports/mimxrt/msc_disk.c

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Original file line numberDiff line numberDiff line change
@@ -36,23 +36,31 @@
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uint8_t tud_msc_state = EJECTED;
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static bool msc_enabled = false;
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void update_msc_state(void) {
4042
if (tud_msc_state == TRANSIT) {
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tud_msc_state = EJECTED;
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}
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}
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void set_msc_enabled(bool state) {
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msc_enabled = state;
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}
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// Invoked when received SCSI_CMD_INQUIRY
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// Application fill vendor id, product id and revision with string up to 8, 16, 4 characters respectively
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void tud_msc_inquiry_cb(uint8_t lun, uint8_t vendor_id[8], uint8_t product_id[16], uint8_t product_rev[4]) {
48-
const char vid[] = "Micropy";
49-
const char pid[] = "Mass Storage";
50-
const char rev[] = "1.0";
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if (msc_enabled) {
55+
const char vid[] = "Micropy";
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const char pid[] = "Mass Storage";
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const char rev[] = "1.0";
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52-
strncpy((char *)vendor_id, vid, 8);
53-
strncpy((char *)product_id, pid, 16);
54-
strncpy((char *)product_rev, rev, 4);
55-
tud_msc_state = MOUNTED;
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strncpy((char *)vendor_id, vid, 8);
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strncpy((char *)product_id, pid, 16);
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strncpy((char *)product_rev, rev, 4);
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tud_msc_state = MOUNTED;
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}
5664
}
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// Invoked when received Test Unit Ready command.
@@ -68,15 +76,17 @@ bool tud_msc_test_unit_ready_cb(uint8_t lun) {
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// Invoked when received SCSI_CMD_READ_CAPACITY_10 and SCSI_CMD_READ_FORMAT_CAPACITY to determine the disk size
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// Application update block count and block size
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void tud_msc_capacity_cb(uint8_t lun, uint32_t *block_count, uint16_t *block_size) {
71-
*block_size = BLOCK_SIZE;
72-
*block_count = BLOCK_COUNT;
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if (msc_enabled) {
80+
*block_size = BLOCK_SIZE;
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*block_count = BLOCK_COUNT;
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}
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}
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7585
// Invoked when received Start Stop Unit command
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// - Start = 0 : stopped power mode, if load_eject = 1 : unload disk storage
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// - Start = 1 : active mode, if load_eject = 1 : load disk storage
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bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject) {
79-
if (load_eject) {
89+
if (load_eject && msc_enabled) {
8090
if (start) {
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// load disk storage
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tud_msc_state = MOUNTED;

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