extended buffer check to usb_cdc_background

sommersoft · sommersoft · commit f237657e5ebc · 2018-03-23T18:41:27.000Z
diff --git a/ports/atmel-samd/usb.c b/ports/atmel-samd/usb.c
@@ -331,6 +331,9 @@ bool usb_connected(void) {
 void usb_cdc_background() {
     //
     if (mp_interrupt_char != -1 && cdc_enabled() && !pending_read) {
-        start_read();
+        // Make sure we have space in the buffer
+        if (usb_rx_count < 64) {
+            start_read();
+        }        
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -331,6 +331,9 @@ bool usb_connected(void) {`
`331`	`331`	`void usb_cdc_background() {`
`332`	`332`	`//`
`333`	`333`	`if (mp_interrupt_char != -1 && cdc_enabled() && !pending_read) {`
`334`		`- start_read();`
	`334`	`+ // Make sure we have space in the buffer`
	`335`	`+ if (usb_rx_count < 64) {`
	`336`	`+ start_read();`
	`337`	`+ }`
`335`	`338`	`}`
`336`	`339`	`}`