example code now also uses USB CDC ACM

main.c

@@ -25,10 +25,12 @@
 #include <libopencm3/stm32/rcc.h> // real-time control clock library
 #include <libopencm3/stm32/gpio.h> // general purpose input output library
 #include <libopencm3/cm3/scb.h> // vector table definition
+#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
 
 /* own libraries */
 #include "main.h" // board definitions
 #include "usart.h" // USART utilities
+#include "usb_cdcacm.h" // USB CDC ACM utilities
 
 /* default output (i.e. for printf) */
 int _write(int file, char *ptr, int len)
@@ -39,8 +41,10 @@ int _write(int file, char *ptr, int len)
 		for (i = 0; i < len; i++) {
 			if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
 				usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
+				cdcacm_putchar('\r'); // a second line feed doesn't break the display
 			}
 			usart_putchar_nonblocking(ptr[i]); // send byte over USART
+			cdcacm_putchar(ptr[i]); // send byte over USB
 		}
 		return i;
 	}
@@ -56,8 +60,7 @@ static void clock_setup(void)
 
 static void gpio_setup(void)
 {
-	/* set LED pin to 'output push-pull' */
-	gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN);
+	gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'	
 }
 
 int main(void)
@@ -67,16 +70,24 @@ int main(void)
 	clock_setup(); // setup main clock
 	gpio_setup(); // setup main inputs/ouputs
 	usart_setup(); // setup USART (for printing)
+	cdcacm_setup(); // setup USB CDC ACM (for printing)
+	
 	setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print	
 	setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
 
+	printf("welcome to the STM32F1 CuVoodoo example code\n");
+
 	/* blink the LED with every transmitted character */
 	while (1) {
 		while (usart_received) { // echo every received character
-			gpio_toggle(LED_PORT, LED_PIN);	// toggle LED
+			gpio_toggle(LED_PORT, LED_PIN); // toggle LED
 			printf("%c",usart_getchar()); // transmit receive character
 		}
-		__asm__("wfi"); // go to sleep
+		while (cdcacm_received) { // echo every received character
+			gpio_toggle(LED_PORT, LED_PIN); // toggle LED
+			printf("%c",cdcacm_getchar()); // transmit receive character
+		}
+		__WFI(); // go to sleep
 	}
 
 	return 0;

main.h

@@ -15,9 +15,9 @@
 /* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
 
 /* LED is on pin 11/PA1 */
+#define LED_RCC RCC_GPIOA
 #define LED_PORT GPIOA
 #define LED_PIN	GPIO1
-#define LED_RCC RCC_GPIOA
 
 /* default output (i.e. for printf) */
 int _write(int file, char *ptr, int len);