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-rw-r--r--protocol/serial_soft.c (renamed from protocol/serial.c)47
1 files changed, 43 insertions, 4 deletions
diff --git a/protocol/serial.c b/protocol/serial_soft.c
index b5c2ae3172..b7d06b644e 100644
--- a/protocol/serial.c
+++ b/protocol/serial_soft.c
@@ -38,12 +38,19 @@ POSSIBILITY OF SUCH DAMAGE.
#include <stdbool.h>
#include <avr/io.h>
#include <avr/interrupt.h>
+#include <util/delay.h>
#include "serial.h"
+/*
+ * Stupid Inefficient Busy-wait Software Serial
+ * is still useful for negative logic signal like Sun protocol not supported by hardware USART.
+ */
+
+#define WAIT_US (1000000/SERIAL_BAUD)
void serial_init(void)
{
- SERIAL_RX_INIT();
+ SERIAL_RXD_INIT();
}
// RX ring buffer
@@ -64,12 +71,44 @@ uint8_t serial_recv(void)
return data;
}
-// USART RX complete interrupt
-ISR(SERIAL_RX_VECT)
+//ISR(INT2_vect)
+ISR(SERIAL_RXD_VECT)
{
+ SERIAL_RXD_INT_ENTER()
+
+ uint8_t data = 0;
+#ifdef SERIAL_BIT_ORDER_MSB
+ uint8_t pos = 0x80;
+#else
+ uint8_t pos = 0x01;
+#endif
+ // to center of start bit
+ _delay_us(WAIT_US/2);
+ do {
+ // to center of next bit
+ _delay_us(WAIT_US);
+
+ if (SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT)) {
+ data |= pos;
+ }
+#ifdef SERIAL_BIT_ORDER_MSB
+ pos >>= 1;
+#else
+ pos <<= 1;
+#endif
+ } while (pos);
+ // to center of stop bit
+ _delay_us(WAIT_US);
+
+#ifdef SERIAL_NEGATIVE_LOGIC
+ data = ~data;
+#endif
+
uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
if (next != rbuf_tail) {
- rbuf[rbuf_head] = SERIAL_RX_DATA;
+ rbuf[rbuf_head] = data;
rbuf_head = next;
}
+
+ SERIAL_RXD_INT_EXIT();
}