Fix software serial configure
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tmk
parent
ea1ede83c3
commit
308abf598d
3 changed files with 93 additions and 96 deletions
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@ -69,11 +69,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define SERIAL_SOFT_RXD_PORT PORTD
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#define SERIAL_SOFT_RXD_PIN PIND
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#define SERIAL_SOFT_RXD_BIT 2
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#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
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#define SERIAL_SOFT_RXD_READ() ~(SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
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#else
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#define SERIAL_SOFT_RXD_READ() (SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
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#endif
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#define SERIAL_SOFT_RXD_READ() (SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
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/* RXD Interupt */
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#define SERIAL_SOFT_RXD_VECT INT2_vect
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#define SERIAL_SOFT_RXD_INIT() do { \
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@ -95,21 +91,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define SERIAL_SOFT_TXD_PORT PORTD
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#define SERIAL_SOFT_TXD_PIN PIND
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#define SERIAL_SOFT_TXD_BIT 3
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#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
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#define SERIAL_SOFT_TXD_ON() do { \
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SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); \
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} while (0)
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#define SERIAL_SOFT_TXD_OFF() do { \
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SERIAL_SOFT_TXD_PORT |= (1<<SERIAL_SOFT_TXD_BIT); \
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} while (0)
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#else
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#define SERIAL_SOFT_TXD_ON() do { \
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SERIAL_SOFT_TXD_PORT |= (1<<SERIAL_SOFT_TXD_BIT); \
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} while (0)
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#define SERIAL_SOFT_TXD_OFF() do { \
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SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); \
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} while (0)
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#endif
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#define SERIAL_SOFT_TXD_HI() do { SERIAL_SOFT_TXD_PORT |= (1<<SERIAL_SOFT_TXD_BIT); } while (0)
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#define SERIAL_SOFT_TXD_LO() do { SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); } while (0)
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#define SERIAL_SOFT_TXD_INIT() do { \
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/* pin configuration: output */ \
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SERIAL_SOFT_TXD_DDR |= (1<<SERIAL_SOFT_TXD_BIT); \
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@ -43,40 +43,46 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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* asynchronous, negative logic, 1200baud, no flow control
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* 1-start bit, 8-data bit, non parity, 1-stop bit
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*/
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#define SERIAL_BAUD 1200
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#define SERIAL_RXD_DDR DDRD
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#define SERIAL_RXD_PORT PORTD
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#define SERIAL_RXD_PIN PIND
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#define SERIAL_RXD_BIT 2
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#define SERIAL_RXD_VECT INT2_vect
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#define SERIAL_RXD_INIT() do { \
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#define SERIAL_SOFT_BAUD 1200
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#define SERIAL_SOFT_PARITY_NONE
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#define SERIAL_SOFT_BIT_ORDER_LSB
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#define SERIAL_SOFT_LOGIC_NEGATIVE
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/* RXD Port */
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#define SERIAL_SOFT_RXD_ENABLE
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#define SERIAL_SOFT_RXD_DDR DDRD
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#define SERIAL_SOFT_RXD_PORT PORTD
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#define SERIAL_SOFT_RXD_PIN PIND
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#define SERIAL_SOFT_RXD_BIT 2
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#define SERIAL_SOFT_RXD_VECT INT2_vect
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/* RXD Interupt */
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#define SERIAL_SOFT_RXD_INIT() do { \
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/* pin configuration: input with pull-up */ \
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SERIAL_RXD_DDR &= ~(1<<SERIAL_RXD_BIT); \
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SERIAL_RXD_PORT |= (1<<SERIAL_RXD_BIT); \
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/* enable interrupt: INT2(rising edge) */ \
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EICRA |= ((1<<ISC21)|(1<<ISC20)); \
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EIMSK |= (1<<INT2); \
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SERIAL_SOFT_RXD_DDR &= ~(1<<SERIAL_SOFT_RXD_BIT); \
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SERIAL_SOFT_RXD_PORT |= (1<<SERIAL_SOFT_RXD_BIT); \
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/* enable interrupt: INT2(rising edge) */ \
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EICRA |= ((1<<ISC21)|(1<<ISC20)); \
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EIMSK |= (1<<INT2); \
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sei(); \
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} while (0)
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#define SERIAL_RXD_INT_ENTER()
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#define SERIAL_RXD_INT_EXIT() do { \
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/* clear interrupt flag */ \
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EIFR = (1<<INTF2); \
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#define SERIAL_SOFT_RXD_INT_ENTER()
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#define SERIAL_SOFT_RXD_INT_EXIT() do { \
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/* clear interrupt flag */ \
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EIFR = (1<<INTF2); \
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} while (0)
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#define SERIAL_RXD_READ() (~SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT))
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#define SERIAL_TXD_DDR DDRD
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#define SERIAL_TXD_PORT PORTD
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#define SERIAL_TXD_PIN PIND
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#define SERIAL_TXD_BIT 3
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/* negative logic */
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#define SERIAL_TXD_ON() do { SERIAL_TXD_PORT &= ~(1<<SERIAL_TXD_BIT); } while (0)
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#define SERIAL_TXD_OFF() do { SERIAL_TXD_PORT |= (1<<SERIAL_TXD_BIT); } while (0)
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#define SERIAL_TXD_INIT() do { \
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/* pin configuration: output */ \
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SERIAL_TXD_DDR |= (1<<SERIAL_TXD_BIT); \
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/* idle */ \
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SERIAL_TXD_ON(); \
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#define SERIAL_SOFT_RXD_READ() (SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
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/* TXD Port */
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#define SERIAL_SOFT_TXD_ENABLE
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#define SERIAL_SOFT_TXD_DDR DDRD
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#define SERIAL_SOFT_TXD_PORT PORTD
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#define SERIAL_SOFT_TXD_PIN PIND
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#define SERIAL_SOFT_TXD_BIT 3
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#define SERIAL_SOFT_TXD_HI() do { SERIAL_SOFT_TXD_PORT |= (1<<SERIAL_SOFT_TXD_BIT); } while (0)
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#define SERIAL_SOFT_TXD_LO() do { SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); } while (0)
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#define SERIAL_SOFT_TXD_INIT() do { \
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/* pin configuration: output */ \
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SERIAL_SOFT_TXD_DDR |= (1<<SERIAL_SOFT_TXD_BIT); \
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/* idle */ \
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SERIAL_SOFT_TXD_ON(); \
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} while (0)
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#endif
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@ -43,12 +43,32 @@ POSSIBILITY OF SUCH DAMAGE.
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/*
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* Stupid Inefficient Busy-wait Software Serial
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* is still useful for negative logic signal like Sun protocol not supported by hardware USART.
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* which is still useful for negative logic signal like Sun protocol
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* if it is not supported by hardware UART.
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*
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* TODO: delay is not accurate enough. Instruction cycle should be counted and inline assemby is needed.
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*/
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#define WAIT_US (1000000L/SERIAL_BAUD)
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#define WAIT_US (1000000L/SERIAL_SOFT_BAUD)
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#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
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#define SERIAL_SOFT_RXD_IN() !(SERIAL_SOFT_RXD_READ())
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#define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_LO()
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#define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_HI()
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#else
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#define SERIAL_SOFT_RXD_IN() !!(SERIAL_SOFT_RXD_READ())
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#define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_HI()
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#define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_LO()
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#endif
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#ifdef SERIAL_SOFT_PARITY_EVEN
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#define SERIAL_SOFT_PARITY_VAL 0
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#elif defined(SERIAL_SOFT_PARITY_ODD)
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#define SERIAL_SOFT_PARITY_VAL 1
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#endif
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/* debug for signal timing, see debug pin with oscilloscope */
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#define SERIAL_SOFT_DEBUG
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#ifdef SERIAL_SOFT_DEBUG
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#define SERIAL_SOFT_DEBUG_INIT() (DDRD |= 1<<7)
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#define SERIAL_SOFT_DEBUG_TGL() (PORTD ^= 1<<7)
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@ -62,8 +82,8 @@ void serial_init(void)
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{
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SERIAL_SOFT_DEBUG_INIT();
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SERIAL_RXD_INIT();
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SERIAL_TXD_INIT();
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SERIAL_SOFT_RXD_INIT();
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SERIAL_SOFT_TXD_INIT();
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}
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/* RX ring buffer */
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@ -101,109 +121,97 @@ void serial_send(uint8_t data)
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{
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/* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */
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#ifdef SERIAL_BIT_ORDER_MSB
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#ifdef SERIAL_SOFT_BIT_ORDER_MSB
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uint8_t mask = 0x80;
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#else
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uint8_t mask = 0x01;
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#endif
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#ifdef SERIAL_PARITY_ODD
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uint8_t parity = 1;
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#elif defined(SERIAL_PARITY_EVEN)
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uint8_t parity = 0;
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#endif
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/* start bit */
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SERIAL_TXD_OFF();
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_delay_us(WAIT_US-2);
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SERIAL_SOFT_TXD_OFF();
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_delay_us(WAIT_US);
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while (mask) {
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if (data&mask) {
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SERIAL_TXD_ON();
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#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
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SERIAL_SOFT_TXD_ON();
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parity ^= 1;
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#endif
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} else {
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SERIAL_TXD_OFF();
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SERIAL_SOFT_TXD_OFF();
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}
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_delay_us(WAIT_US-2);
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_delay_us(WAIT_US);
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#ifdef SERIAL_BIT_ORDER_MSB
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#ifdef SERIAL_SOFT_BIT_ORDER_MSB
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mask >>= 1;
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#else
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mask <<= 1;
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#endif
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}
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#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
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#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
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/* to center of parity bit */
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if (parity) {
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SERIAL_TXD_ON();
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if (parity != SERIAL_SOFT_PARITY_VAL) {
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SERIAL_SOFT_TXD_ON();
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} else {
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SERIAL_TXD_OFF();
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SERIAL_SOFT_TXD_OFF();
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}
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_delay_us(WAIT_US-2);
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_delay_us(WAIT_US);
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#endif
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/* stop bit */
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SERIAL_TXD_ON();
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_delay_us(WAIT_US-2);
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SERIAL_SOFT_TXD_ON();
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_delay_us(WAIT_US);
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}
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/* detect edge of start bit */
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ISR(SERIAL_RXD_VECT)
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ISR(SERIAL_SOFT_RXD_VECT)
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{
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SERIAL_SOFT_DEBUG_TGL()
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SERIAL_RXD_INT_ENTER()
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SERIAL_SOFT_DEBUG_TGL();
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SERIAL_SOFT_RXD_INT_ENTER()
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uint8_t data = 0;
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#ifdef SERIAL_BIT_ORDER_MSB
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#ifdef SERIAL_SOFT_BIT_ORDER_MSB
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uint8_t mask = 0x80;
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#else
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uint8_t mask = 0x01;
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#endif
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#ifdef SERIAL_PARITY_ODD
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uint8_t parity = 0;
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#elif defined(SERIAL_PARITY_EVEN)
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uint8_t parity = 1;
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#endif
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/* to center of start bit */
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_delay_us(WAIT_US/2);
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SERIAL_SOFT_DEBUG_TGL()
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SERIAL_SOFT_DEBUG_TGL();
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do {
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/* to center of next bit */
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_delay_us(WAIT_US);
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SERIAL_SOFT_DEBUG_TGL()
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if (SERIAL_RXD_READ()) {
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SERIAL_SOFT_DEBUG_TGL();
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if (SERIAL_SOFT_RXD_IN()) {
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data |= mask;
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#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
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parity ^= 1;
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#endif
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}
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#ifdef SERIAL_BIT_ORDER_MSB
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#ifdef SERIAL_SOFT_BIT_ORDER_MSB
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mask >>= 1;
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#else
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mask <<= 1;
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#endif
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} while (mask);
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#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
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#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
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/* to center of parity bit */
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_delay_us(WAIT_US);
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if (SERIAL_RXD_READ()) { parity ^= 1; }
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SERIAL_SOFT_DEBUG_TGL()
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if (SERIAL_SOFT_RXD_IN()) { parity ^= 1; }
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SERIAL_SOFT_DEBUG_TGL();
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#endif
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/* to center of stop bit */
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_delay_us(WAIT_US);
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uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
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#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
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if (parity && next != rbuf_tail) {
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#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
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if ((parity == SERIAL_SOFT_PARITY_VAL) && next != rbuf_tail) {
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#else
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if (next != rbuf_tail) {
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#endif
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@ -211,6 +219,6 @@ ISR(SERIAL_RXD_VECT)
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rbuf_head = next;
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}
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SERIAL_RXD_INT_EXIT();
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SERIAL_SOFT_DEBUG_TGL()
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SERIAL_SOFT_RXD_INT_EXIT();
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SERIAL_SOFT_DEBUG_TGL();
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}
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