152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
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#include <avr/io.h>
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/* most of the definitions borrowed from Peter Fleury's UART-Library
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extende for control-register C and ATmega169 */
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#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega16__) || defined(__AVR_ATmega32__) \
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|| defined(__AVR_ATmega8515__) || defined(__AVR_ATmega8535__) \
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|| defined(__AVR_ATmega323__)
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/* ATMega with one USART */
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#define ATMEGA_USART
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#define UART0_UBRR_HIGH UBRRH
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#define UART0_UBRR_LOW UBRRL
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#define UART0_RECEIVE_INTERRUPT SIG_UART_RECV
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#define UART0_TRANSMIT_INTERRUPT SIG_UART_DATA
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega162__)
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/* ATMega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_UBRR_HIGH UBRR0H
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#define UART0_UBRR_LOW UBRR0L
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#define UART1_UBRR_HIGH UBRR1H
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#define UART1_UBRR_LOW UBRR1L
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#define UART0_RECEIVE_INTERRUPT SIG_USART0_RECV
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#define UART1_RECEIVE_INTERRUPT SIG_USART1_RECV
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#define UART0_TRANSMIT_INTERRUPT SIG_USART0_DATA
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#define UART1_TRANSMIT_INTERRUPT SIG_USART1_DATA
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_CONTROL2 UCSR0C
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_CONTROL2 UCSR1C
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#elif defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
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/* ATMega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_UBRR_HIGH UBRR0H
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#define UART0_UBRR_LOW UBRR0L
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#define UART1_UBRR_HIGH UBRR1H
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#define UART1_UBRR_LOW UBRR1L
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#define UART0_RECEIVE_INTERRUPT SIG_UART0_RECV
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#define UART1_RECEIVE_INTERRUPT SIG_UART1_RECV
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#define UART0_TRANSMIT_INTERRUPT SIG_UART0_DATA
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#define UART1_TRANSMIT_INTERRUPT SIG_UART1_DATA
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_CONTROL2 UCSR0C
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_CONTROL2 UCSR1C
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#elif defined(__AVR_ATmega169__)
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#define ATMEGA_USART
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#define UART0_UBRR_HIGH UBRR0H
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#define UART0_UBRR_LOW UBRR0L
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// TODO #define UART0_RECEIVE_INTERRUPT SIG_UART_RECV
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// TODO #define UART0_TRANSMIT_INTERRUPT SIG_UART_DATA
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_CONTROL2 UCSR0C
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#define UART0_DATA UDR0
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#define UART0_DOUBLEAVAIL
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// TODO #define UART0_UDRIE UDRIE
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#else
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#error "Processor type not supported in uart.c !"
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#endif
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void USART_Init(unsigned int baudrate, unsigned char doublespeed)
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{
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// Set baud rate
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UART0_UBRR_HIGH = (unsigned char)(baudrate>>8);
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UART0_UBRR_LOW = (unsigned char)baudrate;
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// Enable 2x speed - TODO adopt to all uCs
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#ifdef UART0_DOUBLEAVAIL
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if (doublespeed) UCSR0A = (1<<U2X0);
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#endif
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#if defined (ATMEGA_USART)
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/* Enable USART receiver and transmitter and disable interrupts */
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UART0_CONTROL = (1<<RXEN)|(1<<TXEN)|(0<<RXCIE)|(0<<UDRIE);
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/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
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#ifdef URSEL
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UCSRC = (1<<URSEL)|(3<<UCSZ0);
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#else
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UCSRC = (3<<UCSZ0);
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#endif
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#elif defined (ATMEGA_USART0 )
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/* Enable USART receiver and transmitter and disable interrupts */
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UART0_CONTROL = (1<<RXEN0)|(1<<TXEN0)|(0<<RXCIE0)|(0<<UDRIE0);
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/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
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#ifdef URSEL0
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UCSR0C = (1<<URSEL0)|(3<<UCSZ00);
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#else
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UCSR0C = (3<<UCSZ00);
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#endif
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#endif
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}
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void sendchar(char data)
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{
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int i = 0;
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UART0_DATA = data;
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if(SREG & 0x80)
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{
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while ( !(UART0_STATUS&0x40) && (i<10000) )
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{
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i++;
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}
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}
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else
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while( !(UART0_STATUS&0x40) );
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UART0_STATUS=UART0_STATUS|0x40; //delete TXCflag
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}
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char recchar(void)
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{
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int i = 0;
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if(SREG & 0x80)
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{
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// while (!(UART0_STATUS & (1<<RXC0)) && (i<10000))
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while (!(UART0_STATUS & 0x80) && (i<10000))
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{
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i++;
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}
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}
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else
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// while(!(UART0_STATUS & (1<<RXC0)));
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while(!(UART0_STATUS & 0x80));
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return UART0_DATA ;
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}
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