2 files changed, 10 insertions, 0 deletions
diff --git a/02-usart/src/isr_vector.c b/02-usart/src/isr_vector.c
index ab38dc2..6d5128c 100644
--- a/02-usart/src/isr_vector.c
+++ b/02-usart/src/isr_vector.c
@@ -1,7 +1,11 @@
 #include "isr_vector.h"
+
+#include "arch.h"
 #include "delay.h"
 #include "gpio.h"
 
+#ifdef ARCH_STM32L4
+
 /* Forward-declare the main function. This is implemented in main.c. */
 void main();
 
@@ -163,3 +167,5 @@ void unhandled_isr()
     delay(5000000);
   }
 }
+
+#endif
diff --git a/02-usart/src/main.c b/02-usart/src/main.c
index 862676c..5f45e0b 100644
--- a/02-usart/src/main.c
+++ b/02-usart/src/main.c
@@ -74,6 +74,8 @@ int enable_usart1(uint32_t baud_rate)
   enable_interrupts();
 }
 
+#ifdef ARCH_STM32L4
+
 /* Main function. This gets executed from the interrupt vector defined above. */
 int main()
 {
@@ -92,3 +94,5 @@ int main()
   usart_transmit_str_sync(&USART2, "Hello, World\n");
   for(;;);
 }
+
+#endif