core: Added a new ELF tag with AVR->simavr command path

[simavr] / tests / atmega88_uart_echo.c

diff --git a/tests/atmega88_uart_echo.c b/tests/atmega88_uart_echo.c
index c2b4ba3..c904013 100644 (file)
--- a/tests/atmega88_uart_echo.c
+++ b/tests/atmega88_uart_echo.c
@@ -21,7 +21,8 @@
  */
 #include "avr_mcu_section.h"
 AVR_MCU(F_CPU, "atmega88");
-
+// tell simavr to listen to commands written in this (unused) register
+AVR_MCU_SIMAVR_COMMAND(&GPIOR0);
 
 static int uart_putchar(char c, FILE *stream) {
   if (c == '\n')
@@ -49,6 +50,9 @@ ISR(USART_RX_vect)
 
 int main()
 {
+       // this tell simavr to put the UART in loopback mode
+       GPIOR0 = SIMAVR_CMD_UART_LOOPBACK;
+
        stdout = &mystdout;
 
        // enable receiver