Fixed issue with GD32 USB reset time being too short, and not enumerating on some PCs

Author: rogerclarkmelbourne

STM32F1/variants/generic_gd32f103c/wirish/boards_setup.cpp

@@ -96,7 +96,7 @@ namespace wirish {
 			gpio_set_mode(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit, GPIO_OUTPUT_PP);
 			gpio_write_bit(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit,0);
 
-			for(volatile unsigned int i=0;i<256;i++);// Only small delay seems to be needed, and USB pins will get configured in Serial.begin
+			for(volatile unsigned int i=0;i<512;i++);// Only small delay seems to be needed, and USB pins will get configured in Serial.begin
 			gpio_set_mode(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit, GPIO_INPUT_FLOATING);
 #endif			
 			Serial.begin();// Roger Clark. Changed SerialUSB to Serial for Arduino sketch compatibility