implement cdc host peek()

hathach · hathach · commit 2c340296670c · 2022-12-24T01:27:10.000+07:00
diff --git a/src/arduino/cdc/Adafruit_USBH_CDC.cpp b/src/arduino/cdc/Adafruit_USBH_CDC.cpp
@@ -49,8 +49,8 @@ int Adafruit_USBH_CDC::available(void) {
 }
 
 int Adafruit_USBH_CDC::peek(void) {
-  // TODO support later
-  return -1;
+  uint8_t ch;
+  return tuh_cdc_peek(_idx, &ch) ? (int)ch : -1;
 }
 
 int Adafruit_USBH_CDC::read(void) {

Original file line number	Diff line number	Diff line change
`@@ -49,8 +49,8 @@ int Adafruit_USBH_CDC::available(void) {`
`49`	`49`	`}`
`50`	`50`
`51`	`51`	`int Adafruit_USBH_CDC::peek(void) {`
`52`		`- // TODO support later`
`53`		`- return -1;`
	`52`	`+ uint8_t ch;`
	`53`	`+ return tuh_cdc_peek(_idx, &ch) ? (int)ch : -1;`
`54`	`54`	`}`
`55`	`55`
`56`	`56`	`int Adafruit_USBH_CDC::read(void) {`