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Diffstat (limited to 'protocol/serial_soft.c')
-rw-r--r--protocol/serial_soft.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c
index af5110b4f6..3c9c914ed6 100644
--- a/protocol/serial_soft.c
+++ b/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()
}