diff --git a/shared-module/usb_cdc/Serial.c b/shared-module/usb_cdc/Serial.c
index 7f1bc75a539a5..23bcc8722dd67 100644
--- a/shared-module/usb_cdc/Serial.c
+++ b/shared-module/usb_cdc/Serial.c
@@ -38,7 +38,10 @@ size_t common_hal_usb_cdc_serial_read(usb_cdc_serial_obj_t *self, uint8_t *data,
// Read up to len bytes immediately.
// The number of bytes read will not be larger than what is already in the TinyUSB FIFO.
- uint32_t total_num_read = tud_cdc_n_read(self->idx, data, len);
+ uint32_t total_num_read = 0;
+ if (tud_cdc_n_connected(self->idx)) {
+ total_num_read = tud_cdc_n_read(self->idx, data, len);
+ }
if (wait_forever || wait_for_timeout) {
// Continue filling the buffer past what we already read.
@@ -65,7 +68,9 @@ size_t common_hal_usb_cdc_serial_read(usb_cdc_serial_obj_t *self, uint8_t *data,
data += num_read;
// Try to read another batch of bytes.
- num_read = tud_cdc_n_read(self->idx, data, len);
+ if (tud_cdc_n_connected(self->idx)) {
+ num_read = tud_cdc_n_read(self->idx, data, len);
+ }
total_num_read += num_read;
}
}
pFad - Phonifier reborn
Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.
Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
Alternative Proxies:
Alternative Proxy
pFad Proxy
pFad v3 Proxy
pFad v4 Proxy