diff options
| author | Jeff Epler <jepler@gmail.com> | 2021-02-21 21:24:49 -0600 |
|---|---|---|
| committer | Jeff Epler <jepler@gmail.com> | 2021-02-21 21:24:49 -0600 |
| commit | 144acfcb988479d6e5802bfa600a62be39d39be7 (patch) | |
| tree | 2c6280c4777ae44aaac10ad29cc5ba1873be81eb /supervisor | |
| parent | 2830984aef2208abe911e1a6143e084293e3fc9c (diff) | |
USB descriptors: Save flash storage for serial number
This saves about 60 bytes (Feather M4 went from 45040 -> 45100 bytes free)
66 bytes of data eliminated, but 6 bytes paid back to initialize the length
field.
Diffstat (limited to 'supervisor')
| -rw-r--r-- | supervisor/shared/usb/usb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c index 5b020b8a0..3c777c505 100644 --- a/supervisor/shared/usb/usb.c +++ b/supervisor/shared/usb/usb.c @@ -62,6 +62,7 @@ void load_serial_number(void) { uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH]; common_hal_mcu_processor_get_uid(raw_id); + usb_serial_number[0] = 0x300 | MP_ARRAY_SIZE(usb_serial_number); for (int i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) { for (int j = 0; j < 2; j++) { uint8_t nibble = (raw_id[i] >> (j * 4)) & 0xf; |