stm32f0: eliminate outdated comments

Fixes: #229

Author: karlp

examples/stm32/f0/stm32f0-discovery/usart/usart.c

@@ -28,13 +28,13 @@ static void clock_setup(void)
 	rcc_periph_clock_enable(RCC_GPIOC);
 	rcc_periph_clock_enable(RCC_GPIOA);
 
-	/* Enable clocks for USART2. */
+	/* Enable clocks for USART. */
 	rcc_periph_clock_enable(RCC_USART1);
 }
 
 static void usart_setup(void)
 {
-	/* Setup USART2 parameters. */
+	/* Setup USART parameters. */
 	usart_set_baudrate(USART1, 115200);
 	usart_set_databits(USART1, 8);
 	usart_set_parity(USART1, USART_PARITY_NONE);
@@ -51,10 +51,10 @@ static void gpio_setup(void)
 	/* Setup GPIO pin GPIO8/9 on GPIO port C for LEDs. */
 	gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO8 | GPIO9);
 
-	/* Setup GPIO pins for USART2 transmit. */
+	/* Setup GPIO pins for USART transmit. */
 	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
 
-	/* Setup USART1 TX pin as alternate function. */
+	/* Setup USART TX pin as alternate function. */
 	gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
 }
 
@@ -66,7 +66,7 @@ int main(void)
 	gpio_setup();
 	usart_setup();
 
-	/* Blink the LED (PD12) on the board with every transmitted byte. */
+	/* Blink the LED on the board with every transmitted byte. */
 	while (1) {
 		gpio_toggle(GPIOC, GPIO8);	/* LED on/off */
 		usart_send_blocking(USART1, c + '0'); /* USART1: Send byte. */

examples/stm32/f0/stm32f0-discovery/usart_stdio/usart_stdio.c

@@ -54,7 +54,7 @@ static ssize_t _iowr(void *_cookie, const char *_buf, size_t _n)
 
 static FILE *usart_setup(uint32_t dev)
 {
-	/* Setup USART2 parameters. */
+	/* Setup USART parameters. */
 	usart_set_baudrate(dev, 115200);
 	usart_set_databits(dev, 8);
 	usart_set_parity(dev, USART_PARITY_NONE);
@@ -79,7 +79,7 @@ static void clock_setup(void)
 	rcc_periph_clock_enable(RCC_GPIOC);
 	rcc_periph_clock_enable(RCC_GPIOA);
 
-	/* Enable clocks for USART2. */
+	/* Enable clocks for USART. */
 	rcc_periph_clock_enable(RCC_USART1);
 }
 
@@ -88,10 +88,10 @@ static void gpio_setup(void)
 	/* Setup GPIO pin GPIO8/9 on GPIO port C for LEDs. */
 	gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO8 | GPIO9);
 
-	/* Setup GPIO pins for USART2 transmit. */
+	/* Setup GPIO pins for USART transmit. */
 	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
 
-	/* Setup USART1 TX pin as alternate function. */
+	/* Setup USART TX pin as alternate function. */
 	gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
 }
 
@@ -104,7 +104,7 @@ int main(void)
 	gpio_setup();
 	fp = usart_setup(USART1);
 
-	/* Blink the LED (PD12) on the board with every transmitted byte. */
+	/* Blink the LED on the board with every transmitted byte. */
 	while (1) {
 		gpio_toggle(GPIOC, GPIO8);	/* LED on/off */