+++ /dev/null
-/* uart.c */
-/*
- This file is part of the AVR-Crypto-Lib.
- Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-/* USART-Init beim ATmegaXX */
-
-#include "config.h"
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdlib.h>
-#include "hexdigit_tab.h"
-#include "uart.h"
-
-#ifdef ATMEGA128
-#define UCSRB UCSR0B
-#define UCSRC UCSR0C
-#define UDR UDR0
-#define UBRRH UBRR0H
-#define UBRRL UBRR0L
-#define URSEL UMSEL
-#define USART_UDRE_vect USART0_UDRE_vect
-#define USART_RXC_vect USART0_RX_vect
-#define UCSRA UCSR0A
-#endif
-
-#ifdef ATMEGA644
-#define UCSRB UCSR0B
-#define UCSRC UCSR0C
-#define UDR UDR0
-#define UBRRH UBRR0H
-#define UBRRL UBRR0L
-#define URSEL UMSEL00
-#define USART_UDRE_vect USART0_UDRE_vect
-#define USART_RXC_vect USART0_RX_vect
-#define UDRIE UDRIE0
-#define TXEN TXEN0
-#define UMSEL UMSEL0
-#define RXEN RXEN0
-#define RXCIE RXCIE0
-#define UCSZ0 UCSZ00
-#define UCSRA UCSR0A
-#define UDRE UDRE0
-#define RXC RXC0
-#endif
-
-#ifdef AT90USB162
-#define UCSRB UCSR1B
-#define UCSRC UCSR1C
-#define UDR UDR1
-#define UBRRH UBRR1H
-#define UBRRL UBRR1L
-#define URSEL UMSEL10
-#define USART_UDRE_vect USART1_UDRE_vect
-#define USART_RXC_vect USART1_RX_vect
-#define UDRIE UDRIE1
-#define TXEN TXEN1
-#define UMSEL UMSEL1
-#define RXEN RXEN1
-#define RXCIE RXCIE1
-#define UCSZ0 UCSZ10
-#define UCSRA UCSR1A
-#define UDRE UDRE1
-#define RXC RXC1
-#endif
-
-
-
-#ifdef UART_XON_XOFF
-#define XON 0x11
-#define XOFF 0x13
-
- #ifdef UART_INTERRUPT
- void uart_insertc(char c);
- #else
- #define uart_insertc uart_putc
- #endif /* UART_INTERRUPT */
-#endif
-
-#define UART_BAUD_CALC(UART_BAUD_RATE,F_OSC) ((F_OSC)/((UART_BAUD_RATE)*16L)-1)
-
-#ifdef UART_XON_XOFF
- typedef enum{go=1,nogo=0} gonogo;
- static gonogo txon=go;
- static gonogo rxon=go;
-#endif
-
-#ifdef UART_INTERRUPT
-volatile static char rxbuf[UART_RXBUFSIZE];
-volatile static char txbuf[UART_TXBUFSIZE];
-volatile static char *volatile rxhead, *volatile rxtail;
-volatile static char *volatile txhead, *volatile txtail;
-
-#ifdef UART_HOOK
- void (*uart_hook) (uint8_t) = (void*)0; /* this is a pointer to a function ;-) */
-#endif
-
-ISR(USART_UDRE_vect) {
-#ifdef UART_LEDS
- PORTC ^= 0x01;
-#endif
-
- if ( txhead == txtail ) {
- UCSRB &= ~(1 << UDRIE); /* disable data register empty IRQ */
- } else {
- #ifdef UART_XON_XOFF
- while(txon==nogo)
- ;
- #endif
- UDR = *txtail; /* schreibt das Zeichen x auf die Schnittstelle */
- if (++txtail == (txbuf + UART_TXBUFSIZE)) txtail = txbuf;
- }
-}
-
-ISR(USART_RXC_vect) {
- int diff;
- char c;
-#ifdef UART_HOOK
- static volatile uint8_t hook_running=0;
-#endif
-#ifdef UART_LEDS
- PORTC ^= 0x02;
-#endif
- c=UDR;
- #ifdef UART_XON_XOFF
- if (c==XON){
- txon=go;
- return;
- }
- if (c==XOFF){
- txon=nogo;
- return;
- }
- #endif
- /* buffer full? */
- diff = rxhead - rxtail;
- if (diff < 0) diff += UART_RXBUFSIZE; /* diff is the amount of bytes in buffer */
- if (diff < UART_RXBUFSIZE -1) {
- // buffer NOT full
-#ifdef UART_HOOK
- if(!hook_running && uart_hook){
- uint8_t t=c;
- hook_running = 1;
- sei(); /* reenable interrupts, avoid recursion!!! */
- do {
- uart_hook(t);
- } while(uart_getc_nb((char*)&t));
- hook_running = 0;
- } else {
- *rxhead = c;
- ++rxhead;
- if (rxhead == (rxbuf + UART_RXBUFSIZE)) rxhead = rxbuf;
- }
-#else
- *rxhead = c;
- ++rxhead;
- if (rxhead == (rxbuf + UART_RXBUFSIZE))
- rxhead = rxbuf;
-#endif
- } else {
- //reads the buffer to clear the interrupt condition
- }
-#ifdef UART_XON_XOFF
- if((diff > UART_XON_XOFF_THRESHOLD_1) && (rxon==go)){
- rxon=nogo;
- uart_insertc(XOFF);
- }
- if((diff < UART_XON_XOFF_THRESHOLD_2) && (rxon==nogo)){
- rxon=go;
- uart_insertc(XON);
- }
-#endif
-}
-
-#endif // UART_INTERRUPT
-
-
-void uart_init() {
- PORTD |= 0x01; //Pullup an RXD an
-
- UCSRB |= (1<<TXEN); //UART TX einschalten
-#ifdef ATMEGA644
- UCSRA = 0;
- UCSRC = (3<<UCSZ0); //Asynchron 8N1
-#else
- UCSRA = 0;
- UCSRC |= (1<<URSEL)|(3<<UCSZ0); //Asynchron 8N1
-#endif
- UCSRB |= ( 1 << RXEN ); //Uart RX einschalten
-
- UBRRH=(uint8_t)(UART_BAUD_CALC(UART_BAUD_RATE,F_CPU)>>8);
- UBRRL=(uint8_t)(UART_BAUD_CALC(UART_BAUD_RATE,F_CPU));
-
-#ifdef UART_INTERRUPT
- // init buffers
- rxhead = rxtail = rxbuf;
- txhead = txtail = txbuf;
-
- // activate rx IRQ
- UCSRB |= _BV(RXCIE) | _BV(UDRIE);
- sei();
-// #ifdef ATMEGA644
-// UCSRB |= _BV(UDRIE);
-// #endif
-#endif // UART_INTERRUPT
-}
-
-#ifdef UART_INTERRUPT
-#ifdef UART_XON_XOFF
-
-void uart_insertc(char c){
- volatile int diff;
- do {
- diff = txhead - txtail;
- if ( diff < 0 ) diff += UART_TXBUFSIZE;
- } while ( diff >= UART_TXBUFSIZE -1 );
-
- cli();
- if (--txtail == (txbuf-1)) txtail += UART_TXBUFSIZE;
- *txtail = c;
-
- UCSRB |= (1 << UDRIE); /* enable data register empty IRQ */
- sei();
-}
-#endif /* UART_XON_XOFF */
-void uart_putc(char c) {
- volatile int diff;
-
- /* buffer full? */
- do {
- diff = txhead - txtail;
- if ( diff < 0 ) diff += UART_TXBUFSIZE;
- } while ( diff >= UART_TXBUFSIZE -1 );
-
- cli();
- *txhead = c;
- if (++txhead == (txbuf + UART_TXBUFSIZE)) txhead = txbuf;
-
- UCSRB |= (1 << UDRIE); /* enable data register empty IRQ */
- sei();
-}
-#else // WITHOUT INTERRUPT
-void uart_putc(char c) {
- while (!(UCSRA & (1<<UDRE))) /* warten bis Senden moeglich */
- ;
- #ifdef UART_XON_XOFF
- while (txon==nogo) /* warte bis XON empfangen */
- ;
- #endif
- UDR = c; /* schreibt das Zeichen x auf die Schnittstelle */
-}
-#endif // UART_INTERRUPT
-
-
-void uart_putstr(char *str) {
- while(*str) {
- uart_putc(*str++);
- }
-}
-
-void uart_putstr_P(PGM_P str) {
- char tmp;
- while((tmp = pgm_read_byte(str))) {
- uart_putc(tmp);
- str++;
- }
-}
-
-void uart_hexdump(const void* buf, int len)
-{
- while(len--){
- uart_putc(pgm_read_byte(hexdigit_tab_P + ((*((uint8_t*)buf))>>4)));
- uart_putc(pgm_read_byte(hexdigit_tab_P + ((*((uint8_t*)buf))&0xf)));
- uart_putc(' ');
- buf=(uint8_t*)buf+1;
- }
-}
-
-
-#ifdef UART_INTERRUPT
-char uart_getc(void)
-{
- char val;
-
- while(rxhead==rxtail)
- ;
-
- val = *rxtail;
- ++rxtail;
- if (rxtail == (rxbuf + UART_RXBUFSIZE))
- rxtail = rxbuf;
-
- return val;
-}
-#else // WITHOUT INTERRUPT
-char uart_getc(void)
-{
- char t;
- while (!(UCSRA & (1<<RXC)))
- ; // warten bis Zeichen verfuegbar
- t=UDR;
- #ifdef UART_XON_XOFF
- if (t==XON) txon=go;
- if (t==XOFF) txon=nogo;
- #endif
- return t; // Zeichen aus UDR zurueckgeben
-}
-#endif // UART_INTERRUPT
-
-// returns 1 on success
-#ifdef UART_INTERRUPT
-char uart_getc_nb(char *c)
-{
- if (rxhead==rxtail) return 0;
-
- *c = *rxtail;
- if (++rxtail == (rxbuf + UART_RXBUFSIZE)) rxtail = rxbuf;
-
- return 1;
-}
-#else // WITHOUT INTERRUPT
-char uart_getc_nb(char *c)
-{
- if (UCSRA & (1<<RXC)) { // Zeichen verfuegbar
- *c = UDR;
- #ifdef UART_XON_XOFF
- if (*c==XON) txon=go;
- if (*c==XOFF) txon=nogo;
- #endif
- return 1;
- }
-
- return 0;
-}
-#endif // UART_INTERRUPT
projects / avr-crypto-lib.git / blobdiff