stm32f0: usart: add callback to process each fully received line

source/drivers/usart_console.c

@@ -18,6 +18,7 @@
 
 struct usart_console {
 	char recv_buf[RECV_BUF_LEN];
+	void (* process_line)(void);
 	volatile size_t cur, next;
 	uint32_t dev;
 };
@@ -28,21 +29,25 @@ struct usart_console user_console;
 static void usart_isr(struct usart_console *console)
 {
 	uint32_t reg;
-	size_t i;
+	size_t idx, next;
 
 	if (!console)
 		return;
 
 	while (usart_get_flag(console->dev, USART_ISR_RXNE)) {
-		console->recv_buf[console->next] = usart_recv(console->dev);
+		idx = console->next;
+		console->recv_buf[idx] = usart_recv(console->dev);
 
-		if (console->recv_buf[console->next] == '\003')
+		next = (console->next + 1) % RECV_BUF_LEN;
-			scb_reset_system();
 
-		i = (console->next + 1) % RECV_BUF_LEN;
+		if (next != console->cur)
+			console->next = next;
 
-		if (i != console->cur)
+		switch (console->recv_buf[idx]) {
-			console->next = i;
+		case '\003': scb_reset_system();
+		case '\r': console->process_line();
+		default: break;
+		}
 	}
 }