Only write to usb when its around.

tannewt · tannewt · commit d012fd155338 · 2018-11-09T17:06:55.000-08:00
diff --git a/supervisor/shared/serial.c b/supervisor/shared/serial.c
@@ -48,6 +48,9 @@ bool serial_bytes_available(void) {
 }
 
 void serial_write_substring(const char* text, uint32_t length) {
+    if (!tud_cdc_connected()) {
+        return;
+    }
     uint32_t count = 0;
     while (count < length) {
         count += tud_cdc_write(text + count, length - count);

Original file line number	Diff line number	Diff line change
`@@ -48,6 +48,9 @@ bool serial_bytes_available(void) {`
`48`	`48`	`}`
`49`	`49`
`50`	`50`	`void serial_write_substring(const char* text, uint32_t length) {`
	`51`	`+ if (!tud_cdc_connected()) {`
	`52`	`+ return;`
	`53`	`+ }`
`51`	`54`	`uint32_t count = 0;`
`52`	`55`	`while (count < length) {`
`53`	`56`	`count += tud_cdc_write(text + count, length - count);`