73 lines
1.2 KiB
C
73 lines
1.2 KiB
C
#include "serial.h"
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#include "ringbuffer.h"
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#define BUFSIZE 64 + sizeof(ringbuffer)
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#define BAUD 19200
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volatile uint8_t _rx_buffer[BUFSIZE];
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volatile uint8_t _tx_buffer[BUFSIZE];
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void serial_init(uint16_t baud)
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{
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ringbuffer_init(rx_buffer, BUFSIZE);
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ringbuffer_init(tx_buffer, BUFSIZE);
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UCSR0A = 0;
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UCSR0B = (1 << RXEN0) | (1 << TXEN0);
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UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
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UBRR0 = ((F_CPU / 16) / baud) - 1;
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UCSR0B |= (1 << RXCIE0) | (1 << UDRIE0);
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}
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ISR(USART_RX_vect)
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{
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ringbuffer_writechar(rx_buffer, UDR0);
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}
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ISR(USART_UDRE_vect)
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{
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if (ringbuffer_canread(tx_buffer))
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{
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UDR0 = ringbuffer_readchar(tx_buffer);
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}
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else
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{
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UCSR0B &= ~(1 << UDRIE0);
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}
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}
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uint16_t serial_rxchars()
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{
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return ringbuffer_canread(rx_buffer);
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}
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uint16_t serial_txchars()
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{
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return ringbuffer_canread(tx_buffer);
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}
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uint8_t serial_popchar()
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{
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return ringbuffer_readchar(rx_buffer);
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}
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uint16_t serial_recvblock(uint8_t *block, int blocksize)
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{
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return ringbuffer_readblock(rx_buffer, block, blocksize);
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}
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void serial_writechar(uint8_t data)
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{
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ringbuffer_writechar(tx_buffer, data);
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UCSR0B |= (1 << UDRIE0);
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}
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void serial_writeblock(uint8_t *data, int datalen)
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{
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ringbuffer_writeblock(tx_buffer, data, datalen);
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UCSR0B |= (1 << UDRIE0);
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}
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