USB-CDC: Avoid need to send ZLP by sending up to (EPX_SIZE-1) bytes at a time

cmaglie · cmaglie · commit 40d9554ed333 · 2016-08-24T01:04:58.000+02:00
diff --git a/cores/arduino/USB/USBCore.cpp b/cores/arduino/USB/USBCore.cpp
@@ -627,8 +627,8 @@ uint32_t USBDeviceClass::send(uint32_t ep, const void *data, uint32_t len)
 	// Flash area
 	while (len != 0)
 	{
-		if (len >= 64) {
-			length = 64;
+		if (len >= EPX_SIZE) {
+			length = EPX_SIZE - 1;
 		} else {
 			length = len;
 		}

Original file line number	Diff line number	Diff line change
`@@ -627,8 +627,8 @@ uint32_t USBDeviceClass::send(uint32_t ep, const void *data, uint32_t len)`
`627`	`627`	`// Flash area`
`628`	`628`	`while (len != 0)`
`629`	`629`	`{`
`630`		`- if (len >= 64) {`
`631`		`- length = 64;`
	`630`	`+ if (len >= EPX_SIZE) {`
	`631`	`+ length = EPX_SIZE - 1;`
`632`	`632`	`} else {`
`633`	`633`	`length = len;`
`634`	`634`	`}`