157 lines
1.7 KiB
C
157 lines
1.7 KiB
C
#include <avr/io.h>
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#include <avr/signal.h>
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#include <avr/interrupt.h>
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#include <uart.h>
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#define BAUDRATE 9600
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#define F_CPU 8000000
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#define nop() __asm volatile ("nop")
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#define SUART_TXD_PORT PORTB
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#define SUART_TXD_DDR DDRB
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#define SUART_TXD_BIT PB6
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static volatile uint16_t outframe;
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void uart_init()
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{
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uint8_t sreg = SREG, tifr = 0;
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cli();
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// Mode #4 für Timer1
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// und volle MCU clock
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// IC Noise Cancel
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// IC on Falling Edge
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TCCR1A = 0;
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TCCR1B = (1 << WGM12) | (1 << CS10) | (0 << ICES1) | (1 << ICNC1);
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// PoutputCompare für gewünschte Timer1 Frequenz
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OCR1A = (uint16_t) ((uint32_t) F_CPU/BAUDRATE);
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tifr |= (1 << OCF1A);
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SUART_TXD_PORT |= (1 << SUART_TXD_BIT);
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SUART_TXD_DDR |= (1 << SUART_TXD_BIT);
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outframe = 0;
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TIFR = tifr;
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SREG = sreg;
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}
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//#### TXD PART ##############################################
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void uart_putc (const char c)
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{
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do
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{
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sei(); nop(); cli(); // yield();
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} while (outframe);
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// frame = *.P.7.6.5.4.3.2.1.0.S S=Start(0), P=Stop(1), *=Endemarke(1)
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outframe = (3 << 9) | (((uint8_t) c) << 1);
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TIMSK |= (1 << OCIE1A);
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TIFR = (1 << OCF1A);
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sei();
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}
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SIGNAL (SIG_OUTPUT_COMPARE1A)
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{
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uint16_t data = outframe;
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if (data & 1) SUART_TXD_PORT |= (1 << SUART_TXD_BIT);
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else SUART_TXD_PORT &= ~(1 << SUART_TXD_BIT);
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if (1 == data)
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{
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TIMSK &= ~(1 << OCIE1A);
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}
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outframe = data >> 1;
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}
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void uart_puts( uint8_t *txt ) // send string
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{
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while( *txt )
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uart_putc ( *txt++ );
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}
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