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@@ -46,7 +46,7 @@ POSSIBILITY OF SUCH DAMAGE. |
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* is still useful for negative logic signal like Sun protocol not supported by hardware USART. |
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*/ |
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#define WAIT_US (1000000/SERIAL_BAUD) |
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#define WAIT_US (1000000L/SERIAL_BAUD) |
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/* debug for signal timing, see debug pin with oscilloscope */ |
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#ifdef SERIAL_SOFT_DEBUG |
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@@ -100,18 +100,33 @@ int16_t serial_recv2(void) |
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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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/* start bit */ |
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SERIAL_TXD_OFF(); |
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_delay_us(WAIT_US); |
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#ifdef SERIAL_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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while (mask) { |
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if (data&mask) { SERIAL_TXD_ON(); } else { SERIAL_TXD_OFF(); } |
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_delay_us(WAIT_US); |
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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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parity ^= 1; |
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#endif |
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} else { |
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SERIAL_TXD_OFF(); |
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} |
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_delay_us(WAIT_US-2); |
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#ifdef SERIAL_BIT_ORDER_MSB |
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mask >>= 1; |
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@@ -120,9 +135,19 @@ void serial_send(uint8_t data) |
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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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/* to center of parity bit */ |
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if (parity) { |
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SERIAL_TXD_ON(); |
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} else { |
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SERIAL_TXD_OFF(); |
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} |
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_delay_us(WAIT_US-2); |
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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); |
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_delay_us(WAIT_US-2); |
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} |
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/* detect edge of start bit */ |