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@@ -38,12 +38,19 @@ POSSIBILITY OF SUCH DAMAGE. |
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#include <stdbool.h> |
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#include <avr/io.h> |
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#include <avr/interrupt.h> |
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#include <util/delay.h> |
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#include "serial.h" |
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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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*/ |
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#define WAIT_US (1000000/SERIAL_BAUD) |
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void serial_init(void) |
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{ |
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SERIAL_RX_INIT(); |
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SERIAL_RXD_INIT(); |
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} |
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// RX ring buffer |
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@@ -64,12 +71,44 @@ uint8_t serial_recv(void) |
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return data; |
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} |
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// USART RX complete interrupt |
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ISR(SERIAL_RX_VECT) |
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//ISR(INT2_vect) |
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ISR(SERIAL_RXD_VECT) |
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{ |
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SERIAL_RXD_INT_ENTER() |
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uint8_t data = 0; |
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#ifdef SERIAL_BIT_ORDER_MSB |
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uint8_t pos = 0x80; |
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#else |
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uint8_t pos = 0x01; |
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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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do { |
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// to center of next bit |
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_delay_us(WAIT_US); |
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if (SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT)) { |
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data |= pos; |
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} |
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#ifdef SERIAL_BIT_ORDER_MSB |
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pos >>= 1; |
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#else |
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pos <<= 1; |
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#endif |
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} while (pos); |
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// to center of stop bit |
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_delay_us(WAIT_US); |
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#ifdef SERIAL_NEGATIVE_LOGIC |
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data = ~data; |
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#endif |
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uint8_t next = (rbuf_head + 1) % RBUF_SIZE; |
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if (next != rbuf_tail) { |
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rbuf[rbuf_head] = SERIAL_RX_DATA; |
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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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} |
tmk
11 years ago