rc_servos: revert endianess in union structure

[protos/rc_servos.git] / main.c

diff --git a/main.c b/main.c
index df8fb93..2e2f13a 100644 (file)
--- a/main.c
+++ b/main.c
@@ -21,10 +21,11 @@ static struct servo servo_table[] = {
 };
 #define NB_SERVO (sizeof(servo_table)/sizeof(*servo_table))
 
-register uint8_t bypass asm("r2");
-register uint8_t done asm("r3");
-register uint8_t portval asm("r4");
-register uint8_t rxidx asm("r5");
+static volatile uint8_t bypass;
+static volatile uint8_t done;
+static volatile uint8_t portval;
+static volatile uint8_t rxidx;
+
 #define BYPASS_ENABLE 14
 #define BYPASS_DISABLE 15
 
@@ -39,22 +40,24 @@ register uint8_t rxidx asm("r5");
  * Command 14 is to enable bypass mode.
  * Command 15 is to disable bypass mode.
  */
-register union {
+static volatile union {
        uint8_t u8;
        struct {
-               uint8_t zero:1;
-               uint8_t cmd_num:4;
+               /* inverted: little endian */
                uint8_t val_msb:3;
+               uint8_t cmd_num:4;
+               uint8_t zero:1;
        };
-} byte0 asm("r6");
+} byte0;
 
-register union {
+static volatile union {
        uint8_t u8;
        struct {
-               uint8_t one:1;
+               /* inverted: little endian */
                uint8_t val_lsb:7;
+               uint8_t one:1;
        };
-} byte1 asm("r7");
+} byte1;
 
 SIGNAL(TIMER1_COMPA_vect)
 {