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Fix software serial configure

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tmk 2013-02-25 08:40:15 +09:00
parent be3dd3c372
commit 1e829faed0
1 changed files with 53 additions and 45 deletions
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98
protocol/serial_soft.c
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@ -43,12 +43,32 @@ POSSIBILITY OF SUCH DAMAGE.
/*
* Stupid Inefficient Busy-wait Software Serial
* is still useful for negative logic signal like Sun protocol not supported by hardware USART.
* which is still useful for negative logic signal like Sun protocol
* if it is not supported by hardware UART.
*
* TODO: delay is not accurate enough. Instruction cycle should be counted and inline assemby is needed.
*/
#define WAIT_US (1000000L/SERIAL_BAUD)
#define WAIT_US (1000000L/SERIAL_SOFT_BAUD)
#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
#define SERIAL_SOFT_RXD_IN() !(SERIAL_SOFT_RXD_READ())
#define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_LO()
#define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_HI()
#else
#define SERIAL_SOFT_RXD_IN() !!(SERIAL_SOFT_RXD_READ())
#define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_HI()
#define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_LO()
#endif
#ifdef SERIAL_SOFT_PARITY_EVEN
#define SERIAL_SOFT_PARITY_VAL 0
#elif defined(SERIAL_SOFT_PARITY_ODD)
#define SERIAL_SOFT_PARITY_VAL 1
#endif
/* debug for signal timing, see debug pin with oscilloscope */
#define SERIAL_SOFT_DEBUG
#ifdef SERIAL_SOFT_DEBUG
#define SERIAL_SOFT_DEBUG_INIT() (DDRD |= 1<<7)
#define SERIAL_SOFT_DEBUG_TGL() (PORTD ^= 1<<7)
@ -62,8 +82,8 @@ void serial_init(void)
{
SERIAL_SOFT_DEBUG_INIT();
SERIAL_RXD_INIT();
SERIAL_TXD_INIT();
SERIAL_SOFT_RXD_INIT();
SERIAL_SOFT_TXD_INIT();
}
/* RX ring buffer */
@ -101,109 +121,97 @@ void serial_send(uint8_t data)
{
/* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */
#ifdef SERIAL_BIT_ORDER_MSB
#ifdef SERIAL_SOFT_BIT_ORDER_MSB
uint8_t mask = 0x80;
#else
uint8_t mask = 0x01;
#endif
#ifdef SERIAL_PARITY_ODD
uint8_t parity = 1;
#elif defined(SERIAL_PARITY_EVEN)
uint8_t parity = 0;
#endif
/* start bit */
SERIAL_TXD_OFF();
_delay_us(WAIT_US-2);
SERIAL_SOFT_TXD_OFF();
_delay_us(WAIT_US);
while (mask) {
if (data&mask) {
SERIAL_TXD_ON();
#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
SERIAL_SOFT_TXD_ON();
parity ^= 1;
#endif
} else {
SERIAL_TXD_OFF();
SERIAL_SOFT_TXD_OFF();
}
_delay_us(WAIT_US-2);
_delay_us(WAIT_US);
#ifdef SERIAL_BIT_ORDER_MSB
#ifdef SERIAL_SOFT_BIT_ORDER_MSB
mask >>= 1;
#else
mask <<= 1;
#endif
}
#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
/* to center of parity bit */
if (parity) {
SERIAL_TXD_ON();
if (parity != SERIAL_SOFT_PARITY_VAL) {
SERIAL_SOFT_TXD_ON();
} else {
SERIAL_TXD_OFF();
SERIAL_SOFT_TXD_OFF();
}
_delay_us(WAIT_US-2);
_delay_us(WAIT_US);
#endif
/* stop bit */
SERIAL_TXD_ON();
_delay_us(WAIT_US-2);
SERIAL_SOFT_TXD_ON();
_delay_us(WAIT_US);
}
/* detect edge of start bit */
ISR(SERIAL_RXD_VECT)
ISR(SERIAL_SOFT_RXD_VECT)
{
SERIAL_SOFT_DEBUG_TGL()
SERIAL_RXD_INT_ENTER()
SERIAL_SOFT_DEBUG_TGL();
SERIAL_SOFT_RXD_INT_ENTER()
uint8_t data = 0;
#ifdef SERIAL_BIT_ORDER_MSB
#ifdef SERIAL_SOFT_BIT_ORDER_MSB
uint8_t mask = 0x80;
#else
uint8_t mask = 0x01;
#endif
#ifdef SERIAL_PARITY_ODD
uint8_t parity = 0;
#elif defined(SERIAL_PARITY_EVEN)
uint8_t parity = 1;
#endif
/* to center of start bit */
_delay_us(WAIT_US/2);
SERIAL_SOFT_DEBUG_TGL()
SERIAL_SOFT_DEBUG_TGL();
do {
/* to center of next bit */
_delay_us(WAIT_US);
SERIAL_SOFT_DEBUG_TGL()
if (SERIAL_RXD_READ()) {
SERIAL_SOFT_DEBUG_TGL();
if (SERIAL_SOFT_RXD_IN()) {
data |= mask;
#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
parity ^= 1;
#endif
}
#ifdef SERIAL_BIT_ORDER_MSB
#ifdef SERIAL_SOFT_BIT_ORDER_MSB
mask >>= 1;
#else
mask <<= 1;
#endif
} while (mask);
#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
/* to center of parity bit */
_delay_us(WAIT_US);
if (SERIAL_RXD_READ()) { parity ^= 1; }
SERIAL_SOFT_DEBUG_TGL()
if (SERIAL_SOFT_RXD_IN()) { parity ^= 1; }
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) {
#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
if ((parity == SERIAL_SOFT_PARITY_VAL) && next != rbuf_tail) {
#else
if (next != rbuf_tail) {
#endif
@ -211,6 +219,6 @@ ISR(SERIAL_RXD_VECT)
rbuf_head = next;
}
SERIAL_RXD_INT_EXIT();
SERIAL_SOFT_DEBUG_TGL()
SERIAL_SOFT_RXD_INT_EXIT();
SERIAL_SOFT_DEBUG_TGL();
}