diff --git a/fw/main.c b/fw/main.c
index bbc70fc..8275f2b 100644
--- a/fw/main.c
+++ b/fw/main.c
@@ -1,8 +1,11 @@
 #include <ch32fun.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 #include <fsusb.h>
 
+#define PIN_LED PA4
+uint8_t pin = 0;
 
 // this callback is mandatory when FUNCONF_USE_USBPRINTF is defined,
 // can be empty though
@@ -25,12 +28,19 @@ __attribute__((noreturn)) int main(void)
 {
 	SystemInit();
 	funGpioInitAll();
+	funPinMode(PIN_LED, GPIO_CFGLR_OUT_10Mhz_PP);
 	USBFSSetup();
+	Delay_Ms(500);
 
 	unsigned int count = 0;
-	while (1) {
+
+	for (uint32_t x = 0; true ; x++) {
 		poll_input(); // usb
-		printf("[%d]: Hello From CH32X035\n", count++);
-		Delay_Ms(100);
+		if ((x % 100) == 0) {
+			printf("[%d]: Hello From CH32X035\n", count++);
+			funDigitalWrite(PIN_LED, pin);
+			pin = !pin;
+		}
+		Delay_Ms(1);
 	}
 }
diff --git a/fw/usb_config.h b/fw/usb_config.h
index f13ce6d..16f9fe9 100644
--- a/fw/usb_config.h
+++ b/fw/usb_config.h
@@ -7,16 +7,16 @@
 // Endpoint numbers, at least one (EP0)
 #define FUSB_CONFIG_EPS       4
 // Endpoint configuration for CDC TTY
-#define FUSB_EP1_MODE         USBFS_EP_TX // TX (IN), CDC Interrupt Endpoint
-#define FUSB_EP2_MODE         USBFS_EP_RX // RX (OUT), CDC Data OUT
-#define FUSB_EP3_MODE         USBFS_EP_TX // TX (IN), CDC Data IN
+#define FUSB_EP1_MODE         1 // TX (IN), CDC Interrupt Endpoint
+#define FUSB_EP2_MODE        -1 // RX (OUT), CDC Data OUT
+#define FUSB_EP3_MODE         1 // TX (IN), CDC Data IN
 // Other hardware configuration
 #define FUSB_SUPPORTS_SLEEP   0
 #define FUSB_HID_INTERFACES   0
 #define FUSB_CURSED_TURBO_DMA 0 // Hacky, but seems fine, shaves 2.5us off filling 64-byte buffers.
 #define FUSB_HID_USER_REPORTS 0
 #define FUSB_IO_PROFILE       0
-//#define FUSB_USE_HPE          FUNCONF_ENABLE_HPE
+#define FUSB_USE_HPE          FUNCONF_ENABLE_HPE
 #define FUSB_USER_HANDLERS    1
 #define FUSB_USE_DMA7_COPY    0
 #define FUSB_VDD_5V           0 // 3.3V