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/* |
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* Copyright (c) 2006-2007 by Roland Riegel <feedback@roland-riegel.de> |
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* |
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* This file is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#include <stdio.h> |
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#include <avr/interrupt.h> |
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#include <avr/io.h> |
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#include <avr/pgmspace.h> |
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#include <avr/sfr_defs.h> |
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#include <avr/sleep.h> |
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#include "uart.h" |
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/* some mcus have multiple uarts */ |
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#ifdef UDR0 |
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#define UBRRH UBRR0H |
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#define UBRRL UBRR0L |
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#define UDR UDR0 |
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#define UCSRA UCSR0A |
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#define UDRE UDRE0 |
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#define RXC RXC0 |
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#define UCSRB UCSR0B |
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#define RXEN RXEN0 |
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#define TXEN TXEN0 |
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#define RXCIE RXCIE0 |
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#define UCSRC UCSR0C |
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#define URSEL |
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#define UCSZ0 UCSZ00 |
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#define UCSZ1 UCSZ01 |
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#define UCSRC_SELECT 0 |
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#else |
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#define UCSRC_SELECT (1 << URSEL) |
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#endif |
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#ifndef USART_RXC_vect |
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#if defined(UART0_RX_vect) |
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#define USART_RXC_vect UART0_RX_vect |
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#elif defined(UART_RX_vect) |
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#define USART_RXC_vect UART_RX_vect |
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#elif defined(USART0_RX_vect) |
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#define USART_RXC_vect USART0_RX_vect |
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#elif defined(USART_RX_vect) |
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#define USART_RXC_vect USART_RX_vect |
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#elif defined(USART0_RXC_vect) |
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#define USART_RXC_vect USART0_RXC_vect |
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#elif defined(USART_RXC_vect) |
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#define USART_RXC_vect USART_RXC_vect |
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#else |
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#error "Uart receive complete interrupt not defined!" |
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#endif |
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#endif |
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#define BAUD 9600UL |
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#define UBRRVAL (F_CPU/(BAUD*16)-1) |
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#define USE_SLEEP 1 |
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void uart_init() |
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{ |
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/* set baud rate */ |
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UBRRH = UBRRVAL >> 8; |
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UBRRL = UBRRVAL & 0xff; |
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/* set frame format: 8 bit, no parity, 1 bit */ |
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UCSRC = UCSRC_SELECT | (1 << UCSZ1) | (1 << UCSZ0); |
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/* enable serial receiver and transmitter */ |
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#if !USE_SLEEP |
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UCSRB = (1 << RXEN) | (1 << TXEN); |
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#else |
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UCSRB = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE); |
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#endif |
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} |
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void uart_putc(uint8_t c) |
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{ |
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if(c == '\n') |
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uart_putc('\r'); |
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/* wait until transmit buffer is empty */ |
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while(!(UCSRA & (1 << UDRE))); |
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/* send next byte */ |
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UDR = c; |
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} |
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void uart_putc_hex(uint8_t b) |
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{ |
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/* upper nibble */ |
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if((b >> 4) < 0x0a) |
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uart_putc((b >> 4) + '0'); |
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else |
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uart_putc((b >> 4) - 0x0a + 'a'); |
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/* lower nibble */ |
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if((b & 0x0f) < 0x0a) |
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uart_putc((b & 0x0f) + '0'); |
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else |
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uart_putc((b & 0x0f) - 0x0a + 'a'); |
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} |
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void uart_putw_hex(uint16_t w) |
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{ |
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uart_putc_hex((uint8_t) (w >> 8)); |
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uart_putc_hex((uint8_t) (w & 0xff)); |
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} |
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void uart_putdw_hex(uint32_t dw) |
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{ |
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uart_putw_hex((uint16_t) (dw >> 16)); |
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uart_putw_hex((uint16_t) (dw & 0xffff)); |
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} |
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void uart_putw_dec(uint16_t w) |
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{ |
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uint16_t num = 10000; |
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uint8_t started = 0; |
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while(num > 0) |
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{ |
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uint8_t b = w / num; |
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if(b > 0 || started || num == 1) |
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{ |
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uart_putc('0' + b); |
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started = 1; |
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} |
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w -= b * num; |
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num /= 10; |
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} |
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} |
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void uart_putdw_dec(uint32_t dw) |
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{ |
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uint32_t num = 1000000000; |
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uint8_t started = 0; |
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while(num > 0) |
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{ |
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uint8_t b = dw / num; |
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if(b > 0 || started || num == 1) |
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{ |
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uart_putc('0' + b); |
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started = 1; |
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} |
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dw -= b * num; |
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num /= 10; |
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} |
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} |
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void uart_puts(const char* str) |
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{ |
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while(*str) |
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uart_putc(*str++); |
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} |
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void uart_puts_p(PGM_P str) |
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{ |
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while(1) |
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{ |
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uint8_t b = pgm_read_byte_near(str++); |
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if(!b) |
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break; |
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uart_putc(b); |
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} |
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} |
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uint8_t uart_getc() |
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{ |
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/* wait until receive buffer is full */ |
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#if USE_SLEEP |
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uint8_t sreg = SREG; |
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sei(); |
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while(!(UCSRA & (1 << RXC))) |
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sleep_mode(); |
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SREG = sreg; |
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#else |
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while(!(UCSRA & (1 << RXC))); |
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#endif |
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uint8_t b = UDR; |
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if(b == '\r') |
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b = '\n'; |
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return b; |
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} |
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EMPTY_INTERRUPT(USART_RXC_vect) |
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