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@@ -48,8 +48,20 @@ POSSIBILITY OF SUCH DAMAGE. |
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#define WAIT_US (1000000/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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#define SERIAL_SOFT_DEBUG_INIT() (DDRD |= 1<<7) |
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#define SERIAL_SOFT_DEBUG_TGL() (PORTD ^= 1<<7) |
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#else |
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#define SERIAL_SOFT_DEBUG_INIT() |
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#define SERIAL_SOFT_DEBUG_TGL() |
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#endif |
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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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} |
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@@ -116,7 +128,7 @@ void serial_send(uint8_t data) |
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/* detect edge of start bit */ |
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ISR(SERIAL_RXD_VECT) |
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{ |
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PORTD ^= 1<<7; |
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SERIAL_SOFT_DEBUG_TGL() |
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SERIAL_RXD_INT_ENTER() |
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uint8_t data = 0; |
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@@ -129,21 +141,23 @@ PORTD ^= 1<<7; |
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#ifdef SERIAL_PARITY_ODD |
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uint8_t parity = 0; |
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#else |
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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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PORTD ^= 1<<7; |
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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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PORTD ^= 1<<7; |
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SERIAL_SOFT_DEBUG_TGL() |
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if (SERIAL_RXD_READ()) { |
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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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mask >>= 1; |
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@@ -152,20 +166,26 @@ PORTD ^= 1<<7; |
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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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/* 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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PORTD ^= 1<<7; |
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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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#else |
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if (next != rbuf_tail) { |
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#endif |
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rbuf[rbuf_head] = data; |
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rbuf_head = next; |
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} |
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SERIAL_RXD_INT_EXIT(); |
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PORTD ^= 1<<7; |
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SERIAL_SOFT_DEBUG_TGL() |
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} |