Add conio

Also removes print statements from the interrupt handler (except for the
button interrupt)

sw/irq.c

@@ -1,30 +1,26 @@
 
 #include <stdint.h>
+#include <conio.h>
 
 #include "interrupt.h"
 #include "uart.h"
+#include "sevenseg.h"
+
+char lastchar;
 
-// This is defined in main.c
-void puts(const char* s);
 
 void handle_irq() {
     uint8_t status;
     char c;
 
-    puts("Interrupt Detected!\n");
-
     status = irq_get_status();
 
     if (status & BUTTON) {
-        puts("Button Interrupt!\n");
+        cputs("Button Interrupt!\n");
         irq_set_status(status & ~BUTTON);
     }
     if (status & UART) {
-        puts("UART Interrupt!\n");
-        c = uart_rxb();
-        puts("Received: ");
-        puts(&c);
-        puts("\n");
+        lastchar = uart_rxb();
         irq_set_status(status & ~UART);
     }
 }