80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
//uart2.c
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#include "uart2.h"
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "rbuf.h"
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#define UART2_BAUD 115200
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#define UART_BAUD_SELECT(baudRate,xtalCpu) (((float)(xtalCpu))/(((float)(baudRate))*8.0)-1.0+0.5)
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#define uart2_rxcomplete (UCSR2A & (1 << RXC2))
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#define uart2_txcomplete (UCSR2A & (1 << TXC2))
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#define uart2_txready (UCSR2A & (1 << UDRE2))
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uint8_t uart2_ibuf[10] = {0, 0};
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FILE _uart2io = {0};
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int uart2_putchar(char c, FILE *stream)
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{
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while (!uart2_txready);
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UDR2 = c; // transmit byte
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// while (!uart2_txcomplete); // wait until byte sent
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// UCSR2A |= (1 << TXC2); // delete TXCflag
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return 0;
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}
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int uart2_getchar(FILE *stream)
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{
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if (rbuf_empty(uart2_ibuf)) return -1;
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return rbuf_get(uart2_ibuf);
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}
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void uart2_init(void)
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{
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rbuf_ini(uart2_ibuf, 6);
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UCSR2A |= (1 << U2X2); // baudrate multiplier
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UBRR2L = UART_BAUD_SELECT(UART2_BAUD, F_CPU); // select baudrate
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UCSR2B = (1 << RXEN2) | (1 << TXEN2); // enable receiver and transmitter
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UCSR2B |= (1 << RXCIE2); // enable rx interrupt
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fdev_setup_stream(uart2io, uart2_putchar, uart2_getchar, _FDEV_SETUP_WRITE | _FDEV_SETUP_READ); //setup uart2 i/o stream
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}
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uint8_t uart2_rx_clr(void)
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{
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rbuf_w(uart2_ibuf) = 0;
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rbuf_r(uart2_ibuf) = 0;
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}
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uint8_t uart2_rx_ok(void)
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{
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//printf_P(PSTR("uart2_rx_ok %hhu %hhu %hhu %hhu %hhu %hhu %hhu %hhu %hhu %hhu\n"), uart2_ibuf[0], uart2_ibuf[1], uart2_ibuf[2], uart2_ibuf[3], uart2_ibuf[4], uart2_ibuf[5], uart2_ibuf[6], uart2_ibuf[7], uart2_ibuf[8], uart2_ibuf[9]);
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// return 0;
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// _lock(); //lock
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uint8_t i = rbuf_w(uart2_ibuf); //get write index
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// _unlock(); //unlock
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uint8_t e = rbuf_l(uart2_ibuf) - 1; //get end index
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// printf_P(PSTR("%d %d \n"), i, e);
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// return 0;
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if ((i--) == 255) i = e; //decrement index
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if ((uart2_ibuf[4 + i] != '\n') &&
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(uart2_ibuf[4 + i] != '\r')) return 0; //no match - exit
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if ((i--) == 255) i = e; //decrement index
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if (uart2_ibuf[4 + i] != 'k') return 0; //no match - exit
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if ((i--) == 255) i = e; //decrement index
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if (uart2_ibuf[4 + i] != 'o') return 0; //no match - exit
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uart2_ibuf[4 + i] = 0; //discard char
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return 1; //match "ok\n"
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}
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ISR(USART2_RX_vect)
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{
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//printf_P(PSTR("USART2_RX_vect \n") );
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if (rbuf_put(uart2_ibuf, UDR2) < 0) // put received byte to buffer
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{
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//rx buffer full
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}
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}
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