200 lines
4.6 KiB
C
200 lines
4.6 KiB
C
/* uart_i.c */
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/*
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This file is part of the AVR-uart_i.
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Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file uart_i.c
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* \email daniel.otte@rub.de
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* \author Daniel Otte
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* \date 2009-07-24
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* \license GPLv3 or later
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* \ingroup uart_i
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* \brief implementation of interrupt based uart
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*/
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#include <stdlib.h>
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#include <avr/interrupt.h>
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#include "config.h"
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#include "uart.h"
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#define XON_VALUE 0x11
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#define XOFF_VALUE 0x13
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#if UART0_I
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#ifndef UART0_PARATY
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# warning "UART0: using default paraty: 'none'"
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# define UART0_PARATY UART_PARATY_NONE
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#endif
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#ifndef UART0_STOPBITS
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# warning "UART0: using default ammount of stop bits: '1'"
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# define UART0_STOPBITS UART_STOPBITS_1
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#endif
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#ifndef UART0_DATABITS
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# warning "UART0: using default ammount of data bits: '8'"
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# define UART0_DATABITS UART_DATABITS_8
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#endif
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#if UART0_DATABITS == UART_DATABITS_9
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# error "UART0: data bits==9 not supported"
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#endif
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#ifdef UDR
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# define OLD_UART
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# ifdef UDR0
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# error "can not decide which registernames to use, UDR and UDR0 are defined"
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# endif
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#endif
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#ifdef OLD_UART
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# define UCSR0A UCSRA
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# define UCSR0B UCSRB
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# define UCSR0C UCSRC
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# define UBRR0H UBRRH
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# define UBRR0L UBRRL
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# define UDR0 UDR
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# define TXEN0 TXEN
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# define RXEN0 RXEN
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# define UDRE0 UDRE
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# define RXC0 RXC
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# define TXB80 TXB8
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# define RXB80 RXB8
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#endif
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uart0_ctx_t uart0_ctx;
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uint8_t uart0_rxbuffer[UART0_RXBUFFER_SIZE];
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uint8_t uart0_txbuffer[UART0_TXBUFFER_SIZE];
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void uart0_init(void){
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circularbytebuffer_init2(UART0_RXBUFFER_SIZE, &(uart0_ctx.rxb), uart0_rxbuffer);
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circularbytebuffer_init2(UART0_TXBUFFER_SIZE, &(uart0_ctx.txb), uart0_txbuffer);
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#if UART0_HOOK
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uart0_ctx.hook = NULL;
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uart0_ctx.hook_running = 0;
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#endif
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#if UART0_SWFLOWCTRL
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uart0_ctx.txon = 1;
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uart0_ctx.rxon = 1;
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#endif
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#define BAUD UART0_BAUD_RATE
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#include <util/setbaud.h>
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UBRR0H = UBRRH_VALUE;
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UBRR0L = UBRRL_VALUE;
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#if USE_2X
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UCSR0A |= _BV(U2X0);
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#else
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UCSR0A &= ~_BV(U2X0);
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#endif
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UCSR0C = (UART0_PARATY<<4)|(UART0_STOPBITS<<3)|((UART0_DATABITS&3)<<1);
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UCSR0B = _BV(RXCIE0) | _BV(UDRIE0) | _BV(RXEN0) | _BV(TXEN0) ; /* enable TX and RX and interrupts */
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sei();
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}
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ISR(USART0_UDRE_vect){
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uint16_t x;
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x = circularbytebuffer_get_fifo(&(uart0_ctx.txb));
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if(x==0xffff){
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/* the transmit buffer is empty, disable interrupt */
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UCSR0B &= (uint8_t)~_BV(UDRIE0);
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return;
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}
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#if UART0_SWFLOWCTRL
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while(!uart0_ctx.txon)
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;
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#endif
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UDR0 = x;
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}
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void uart0_putc (uint16_t c){
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#if UART0_SWFLOWCTRL
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while(!uart0_ctx.txon)
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;
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#endif
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while(circularbytebuffer_cnt(&(uart0_ctx.txb))==UART0_TXBUFFER_SIZE)
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;
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cli();
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circularbytebuffer_append((uint8_t)c, &(uart0_ctx.txb));
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sei();
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UCSR0B |= (uint8_t)_BV(UDRIE0);
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}
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ISR(USART0_RX_vect){
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uint16_t c;
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c = UDR0;
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#if UART0_SWFLOWCTRL
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if(c==XON_VALUE){
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uart0_ctx.txon = 1;
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return;
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}
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if(c==XOFF_VALUE){
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uart0_ctx.txon = 0;
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return;
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}
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#endif
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#if UART0_HOOK
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if((!uart0_ctx.hook_running) && uart0_ctx.hook){
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uart0_ctx.hook_running=1;
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sei();
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do{
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uart0_ctx.hook(c);
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}while((c=circularbytebuffer_get_fifo(&(uart0_ctx.rxb)))!=0xffff);
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uart0_ctx.hook_running=0;
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return;
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}
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#endif
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if(circularbytebuffer_cnt(&(uart0_ctx.rxb))==UART0_RXBUFFER_SIZE)
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return;
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circularbytebuffer_append(c, &(uart0_ctx.rxb));
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#if UART0_SWFLOWCTRL
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if(circularbytebuffer_cnt(&(uart0_ctx.rxb))>UART0_THRESH_HIGH && uart0_ctx.rxon){
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uart0_ctx.rxon = 0;
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circularbytebuffer_push(XOFF_VALUE, &(uart0_ctx.txb));
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UCSR0B |= (uint8_t)_BV(UDRIE0);
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}
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if(circularbytebuffer_cnt(&(uart0_ctx.rxb))<UART0_THRESH_LOW && !uart0_ctx.rxon){
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uart0_ctx.rxon = 1;
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circularbytebuffer_push(XON_VALUE, &(uart0_ctx.txb));
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UCSR0B |= (uint8_t)_BV(UDRIE0);
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}
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#endif
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}
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uint16_t uart0_getc(void){
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uint8_t ret;
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while(circularbytebuffer_cnt(&(uart0_ctx.rxb))==0)
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;
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cli();
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ret = circularbytebuffer_get_fifo(&(uart0_ctx.rxb));
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sei();
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return ret;
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}
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uint8_t uart0_dataavail(void){
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return circularbytebuffer_cnt(&(uart0_ctx.rxb));
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}
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#if UART0_HOOK
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void uart0_sethook(void(*fpt)(uint8_t)){
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uart0_ctx.hook = fpt;
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}
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#endif
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#endif /* UART0_I */
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