BV UART: add transceive command

lib/busvoodoo_uart.c

@@ -261,11 +261,47 @@ static void busvoodoo_uart_command_transmit(void* argument)
 static void busvoodoo_uart_command_receive(void* argument)
 {
 	(void)argument; // we won't use the argument
-	while (true) {
-		char c = usart_recv_blocking(USART(BUSVOODOO_USART_ID)); // receive character
-		busvoodoo_led_blue(100); // enable blue LED to show reception
-		printf("%c", c); // print received character
+	printf("press any key to exit\n");
+	while (!user_input_available) { // check for user input to exit
+		if ((USART_SR(USART(BUSVOODOO_USART_ID)) & USART_SR_RXNE)) { // verify if data has been received
+			char c = usart_recv(USART(BUSVOODOO_USART_ID)); // receive character
+			busvoodoo_led_blue(100); // enable blue LED to show reception
+			printf("%c", c); // print received character
+		}
 	}
+	user_input_get(); // discard user input
+	printf("\n"); // get to next line
+}
+
+/** command to transmit and receive data
+ *  @param[in] argument no argument required
+ */
+static void busvoodoo_uart_command_transceive(void* argument)
+{
+	(void)argument; // we won't use the argument
+	printf("press 5 times escape to exit\n");
+	char last_c = 0; // last user character received
+	uint8_t esc_count = 0; // number of times escape has press received
+	while (esc_count<5) { // check for escape sequence
+		if (user_input_available) { // check if user wants to transmit something
+			char c = user_input_get(); // get user input
+			if (0x1b==c) { // user pressed escape
+				if (0x1b!=last_c) { // this is the first escape press
+					esc_count = 0;
+				}
+				last_c = c; // remember key press
+				esc_count++; // increment escape count
+			}
+			usart_send_blocking(USART(BUSVOODOO_USART_ID), c); // send user character
+			busvoodoo_led_red(100); // enable red LED to show transmission
+		}
+		if ((USART_SR(USART(BUSVOODOO_USART_ID)) & USART_SR_RXNE)) { // verify if data has been received
+			char c = usart_recv(USART(BUSVOODOO_USART_ID)); // receive character
+			busvoodoo_led_blue(100); // enable blue LED to show reception
+			printf("%c", c); // print received character
+		}
+	}
+	printf("\n"); // get to next line
 }
 
 static const struct menu_command_t busvoodoo_uart_commands[] = {
@@ -285,6 +321,14 @@ static const struct menu_command_t busvoodoo_uart_commands[] = {
 		"word",
 		&busvoodoo_uart_command_transmit,
 	},
+	{
+		'x',
+		"transceive",
+		"transmit and receive data",
+		MENU_ARGUMENT_NONE,
+		NULL,
+		&busvoodoo_uart_command_transceive,
+	},
 };
 
 struct busvoodoo_mode_t busvoodoo_uart_mode = {