1 files changed, 26 insertions(+), 6 deletions(-)

M protocol/serial_soft.c

@@ 48,8 48,20 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #define WAIT_US     (1000000/SERIAL_BAUD)
 
+/* debug for signal timing, see debug pin with oscilloscope */
+#ifdef SERIAL_SOFT_DEBUG
+    #define SERIAL_SOFT_DEBUG_INIT()    (DDRD |= 1<<7)
+    #define SERIAL_SOFT_DEBUG_TGL()     (PORTD ^= 1<<7)
+#else
+    #define SERIAL_SOFT_DEBUG_INIT()
+    #define SERIAL_SOFT_DEBUG_TGL()
+#endif
+
+
 void serial_init(void)
 {
+    SERIAL_SOFT_DEBUG_INIT();
+
     SERIAL_RXD_INIT();
     SERIAL_TXD_INIT();
 }


@@ 116,7 128,7 @@ void serial_send(uint8_t data)
 /* detect edge of start bit */
 ISR(SERIAL_RXD_VECT)
 {
-PORTD ^= 1<<7;
+    SERIAL_SOFT_DEBUG_TGL()
     SERIAL_RXD_INT_ENTER()
 
     uint8_t data = 0;


@@ 129,21 141,23 @@ PORTD ^= 1<<7;
 
 #ifdef SERIAL_PARITY_ODD
     uint8_t parity = 0;
-#else
+#elif defined(SERIAL_PARITY_EVEN)
     uint8_t parity = 1;
 #endif
 
     /* to center of start bit */
     _delay_us(WAIT_US/2);
-PORTD ^= 1<<7;
+    SERIAL_SOFT_DEBUG_TGL()
     do {
         /* to center of next bit */
         _delay_us(WAIT_US);
 
-PORTD ^= 1<<7;
+    SERIAL_SOFT_DEBUG_TGL()
         if (SERIAL_RXD_READ()) {
             data |= mask;
+#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
             parity ^= 1;
+#endif
         }
 #ifdef SERIAL_BIT_ORDER_MSB
         mask >>= 1;


@@ 152,20 166,26 @@ PORTD ^= 1<<7;
 #endif
     } while (mask);
 
+#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
     /* to center of parity bit */
     _delay_us(WAIT_US);
     if (SERIAL_RXD_READ()) { parity ^= 1; }
-PORTD ^= 1<<7;
+    SERIAL_SOFT_DEBUG_TGL()
+#endif
 
     /* to center of stop bit */
     _delay_us(WAIT_US);
 
     uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
     if (parity && next != rbuf_tail) {
+#else
+    if (next != rbuf_tail) {
+#endif
         rbuf[rbuf_head] = data;
         rbuf_head = next;
     }
 
     SERIAL_RXD_INT_EXIT();
-PORTD ^= 1<<7;
+    SERIAL_SOFT_DEBUG_TGL()
 }