Jeff Epler 3d66ed27ce
oofatfs: enable use of random volume IDs
This may help address  if the underlying cause is the deterministic
volume ID. However, not all boards have working urandom (samd21
at least does not) so a couple of fallbacks are attempted when it fails.

I verified that on a pico_w, each `storage.erase_filesystem()` gives
a distinct 32-bit volume ID (pico_w's urandom can never fail)
2023-01-03 17:18:29 -06:00

69 lines
2.5 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2022 Scott Shawcroft for Adafruit Industries
*
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
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* 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 "supervisor/fatfs.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"
#include "shared-bindings/microcontroller/Processor.h"
#include "shared-bindings/os/__init__.h"
#include "shared-bindings/rtc/RTC.h"
#include "shared-bindings/time/__init__.h"
#include "shared/timeutils/timeutils.h"
DWORD _time_override = 0;
DWORD get_fattime(void) {
if (_time_override > 0) {
return _time_override;
}
#if CIRCUITPY_RTC
timeutils_struct_time_t tm;
common_hal_rtc_get_time(&tm);
return ((tm.tm_year - 1980) << 25) | (tm.tm_mon << 21) | (tm.tm_mday << 16) |
(tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
#else
return ((2016 - 1980) << 25) | ((9) << 21) | ((1) << 16) | ((16) << 11) | ((43) << 5) | (35 / 2);
#endif
}
void override_fattime(DWORD time) {
_time_override = time;
}
DWORD make_volid(void) {
DWORD result;
if (!common_hal_os_urandom((uint8_t *)&result, sizeof(result))) {
#if CIRCUITPY_MICROCONTROLLER && COMMON_HAL_MCU_PROCESSOR_UID_LENGTH >= 4
uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
common_hal_mcu_processor_get_uid(raw_id);
memcpy(&result, raw_id, sizeof(result));
#else
result = (DWORD)common_hal_time_monotonic_ns();
#endif
}
return result;
}