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Use software serial for Sun.

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This commit is contained in:
tmk 2012-10-19 14:06:18 +09:00
parent 97ee1be59d
commit b56717b843
9 changed files with 286 additions and 281 deletions
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47
protocol/serial.c → protocol/serial_soft.c
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@ -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();
}