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mp_usbd_cdc.c: Skip writing to an uninitialized USB device. #15481

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Merged
dpgeorge merged 1 commit into from
Jul 19, 2024
Merged

mp_usbd_cdc.c: Skip writing to an uninitialized USB device. #15481

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1 change: 0 additions & 1 deletion shared/tinyusb/mp_usbd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,6 @@ inline static bool mp_usb_device_builtin_enabled(const mp_obj_usb_device_t *usbd

static inline void mp_usbd_init(void) {
// Without runtime USB support, this can be a thin wrapper wrapper around tusb_init()
extern bool tusb_init(void);
tusb_init();
}

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3 changes: 3 additions & 0 deletions shared/tinyusb/mp_usbd_cdc.c
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Expand Up @@ -95,6 +95,9 @@ void tud_cdc_rx_cb(uint8_t itf) {
}

mp_uint_t mp_usbd_cdc_tx_strn(const char *str, mp_uint_t len) {
if (!tusb_inited()) {
return 0;
}
size_t i = 0;
while (i < len) {
uint32_t n = len - i;
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