rn42: Add rn42_getc and rn42_gets

keyboard/hhkb_rn42/rn42/rn42.c

@@ -4,6 +4,7 @@
 #include "serial.h"
 #include "rn42.h"
 #include "print.h"
+#include "timer.h"
 #include "wait.h"
 
 
@@ -47,11 +48,39 @@ void rn42_init(void)
     serial_init();
 }
 
+int16_t rn42_getc(void)
+{
+    return serial_recv2();
+}
+
+char *rn42_gets(uint16_t timeout)
+{
+    static char s[16];
+    uint16_t t = timer_read();
+    uint8_t i = 0;
+    int16_t c;
+    while (i < 15 && timer_elapsed(t) < timeout) {
+               if ((c = rn42_getc()) != -1) {
+            if ((char)c == '\r') continue;
+            if ((char)c == '\n') break;
+            s[i++] = c;
+        }
+    }
+    s[i] = '\0';
+    return s;
+}
+
 void rn42_putc(uint8_t c)
 {
     serial_send(c);
 }
 
+void rn42_puts(char *s)
+{
+    while (*s)
+	serial_send(*s++);
+}
+
 bool rn42_autoconnecting(void)
 {
     // GPIO6 for control connection(high: auto connect, low: disconnect)

keyboard/hhkb_rn42/rn42/rn42.h

@@ -7,7 +7,10 @@ host_driver_t rn42_driver;
 host_driver_t rn42_config_driver;
 
 void rn42_init(void);
+int16_t rn42_getc(void);
+char *rn42_gets(uint16_t timeout);
 void rn42_putc(uint8_t c);
+void rn42_puts(char *s);
 bool rn42_autoconnecting(void);
 void rn42_autoconnect(void);
 void rn42_disconnect(void);