120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/***************************************************************************
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* Copyright (C) 2006 - 2020 by Olaf Rempel *
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* razzor AT kopf MINUS tisch DOT de *
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* *
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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; version 2 of the License, *
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* *
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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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* *
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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, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/io.h>
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#include "target.h"
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#include "uart.h"
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#define UART_CALC_BAUDRATE(baudRate) (((uint32_t)F_CPU) / (((uint32_t)baudRate)*16) -1)
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/* ***********************************************************************
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* uart_send
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* *********************************************************************** */
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void uart_send(uint8_t data)
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{
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#if defined(__AVR_ATmega16__)
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loop_until_bit_is_set(UCSRA, UDRE);
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UDR = data;
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#elif defined(__AVR_ATmega328P__)
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = data;
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#endif
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} /* uart_send */
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/* ***********************************************************************
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* uart_recv
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* *********************************************************************** */
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uint8_t uart_recv(void)
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{
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#if defined(__AVR_ATmega16__)
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loop_until_bit_is_set(UCSRA, RXC);
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return UDR;
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#elif defined(__AVR_ATmega328P__)
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loop_until_bit_is_set(UCSR0A, RXC0);
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return UDR0;
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#endif
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} /* uart_recv */
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/* ***********************************************************************
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* uart_rx_ready
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* *********************************************************************** */
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uint8_t uart_rx_ready(void)
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{
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#if defined(__AVR_ATmega16__)
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return ((UCSRA & (1<<RXC)) == (1<<RXC));
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#elif defined(__AVR_ATmega328P__)
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return ((UCSR0A & (1<<RXC0)) == (1<<RXC0));
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#endif
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} /* uart_rx_ready */
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/* ***********************************************************************
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* uart_send_buf
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* *********************************************************************** */
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void uart_send_buf(const uint8_t * p_data, uint16_t data_length)
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{
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while (data_length--)
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{
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uart_send(*p_data++);
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}
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} /* uart_send_buf */
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/* ***********************************************************************
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* uart_recv_buf
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* *********************************************************************** */
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void uart_recv_buf(uint8_t * p_data, uint16_t data_length)
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{
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while (data_length--)
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{
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*p_data++ = uart_recv();
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}
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} /* uart_recv_buf */
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/* ***********************************************************************
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* uart_init
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* *********************************************************************** */
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void uart_init(void)
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{
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#if defined(OSCCAL_VALUE)
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OSCCAL = OSCCAL_VALUE;
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#endif /* defined(OSCCAL_VALUE) */
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#if defined(__AVR_ATmega16__)
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/* Set baud rate */
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UBRRH = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
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UBRRL = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);
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/* enable usart with 8n1 */
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UCSRB = (1<<TXEN) | (1<<RXEN);
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UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);
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#elif defined(__AVR_ATmega328P__)
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/* Set baud rate */
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UBRR0H = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
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UBRR0L = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);
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/* enable usart with 8n1 */
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UCSR0B = (1<<TXEN0) | (1<<RXEN0);
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UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);
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#endif
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} /* uart_init */
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