Increase SerialUSB speed (earlephilhower#833)

earlephilhower · web-flow · commit db337a9b36b0 · 2022-09-06T12:44:34.000-07:00
Add calls to `tud_task` to pump the USB interface in the SerialUSB methods. See earlephilhower#832 for more info.
diff --git a/cores/rp2040/SerialUSB.cpp b/cores/rp2040/SerialUSB.cpp
@@ -70,6 +70,7 @@ int SerialUSB::peek() {
     }
 
     uint8_t c;
+    tud_task();
     return tud_cdc_peek(&c) ? (int) c : -1;
 }
 
@@ -79,6 +80,7 @@ int SerialUSB::read() {
         return -1;
     }
 
+    tud_task();
     if (tud_cdc_available()) {
         return tud_cdc_read_char();
     }
@@ -91,6 +93,7 @@ int SerialUSB::available() {
         return 0;
     }
 
+    tud_task();
     return tud_cdc_available();
 }
 
@@ -100,6 +103,7 @@ int SerialUSB::availableForWrite() {
         return 0;
     }
 
+    tud_task();
     return tud_cdc_write_available();
 }
 
@@ -110,6 +114,7 @@ void SerialUSB::flush() {
     }
 
     tud_cdc_write_flush();
+    tud_task();
 }
 
 size_t SerialUSB::write(uint8_t c) {
@@ -151,6 +156,7 @@ size_t SerialUSB::write(const uint8_t *buf, size_t length) {
         // reset our timeout
         last_avail_time = 0;
     }
+    tud_task();
     return written;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -70,6 +70,7 @@ int SerialUSB::peek() {`
`70`	`70`	`}`
`71`	`71`
`72`	`72`	`uint8_t c;`
	`73`	`+ tud_task();`
`73`	`74`	`return tud_cdc_peek(&c) ? (int) c : -1;`
`74`	`75`	`}`
`75`	`76`
`@@ -79,6 +80,7 @@ int SerialUSB::read() {`
`79`	`80`	`return -1;`
`80`	`81`	`}`
`81`	`82`
	`83`	`+ tud_task();`
`82`	`84`	`if (tud_cdc_available()) {`
`83`	`85`	`return tud_cdc_read_char();`
`84`	`86`	`}`
`@@ -91,6 +93,7 @@ int SerialUSB::available() {`
`91`	`93`	`return 0;`
`92`	`94`	`}`
`93`	`95`
	`96`	`+ tud_task();`
`94`	`97`	`return tud_cdc_available();`
`95`	`98`	`}`
`96`	`99`
`@@ -100,6 +103,7 @@ int SerialUSB::availableForWrite() {`
`100`	`103`	`return 0;`
`101`	`104`	`}`
`102`	`105`
	`106`	`+ tud_task();`
`103`	`107`	`return tud_cdc_write_available();`
`104`	`108`	`}`
`105`	`109`
`@@ -110,6 +114,7 @@ void SerialUSB::flush() {`
`110`	`114`	`}`
`111`	`115`
`112`	`116`	`tud_cdc_write_flush();`
	`117`	`+ tud_task();`
`113`	`118`	`}`
`114`	`119`
`115`	`120`	`size_t SerialUSB::write(uint8_t c) {`
`@@ -151,6 +156,7 @@ size_t SerialUSB::write(const uint8_t *buf, size_t length) {`
`151`	`156`	`// reset our timeout`
`152`	`157`	`last_avail_time = 0;`
`153`	`158`	`}`
	`159`	`+ tud_task();`
`154`	`160`	`return written;`
`155`	`161`	`}`
`156`	`162`