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- #include <stdbool.h>
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include "serial.h"
- void serial_init(void)
- {
- SERIAL_UART_INIT();
- }
- #define RBUF_SIZE 8
- static uint8_t rbuf[RBUF_SIZE];
- static uint8_t rbuf_head = 0;
- static uint8_t rbuf_tail = 0;
- uint8_t serial_recv(void)
- {
- uint8_t data = 0;
- if (rbuf_head == rbuf_tail) {
- return 0;
- }
- data = rbuf[rbuf_tail];
- rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
- return data;
- }
- int16_t serial_recv2(void)
- {
- uint8_t data = 0;
- if (rbuf_head == rbuf_tail) {
- return -1;
- }
- data = rbuf[rbuf_tail];
- rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
- return data;
- }
- void serial_send(uint8_t data)
- {
- while (!SERIAL_UART_TXD_READY) ;
- SERIAL_UART_DATA = data;
- }
- ISR(SERIAL_UART_RXD_VECT)
- {
- uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
- if (next != rbuf_tail) {
- rbuf[rbuf_head] = SERIAL_UART_DATA;
- rbuf_head = next;
- }
- }
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