43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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#ifndef F_CPU
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#define F_CPU 8000000
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#endif
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#include <avr/io.h>
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#include <stdio.h>
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#include <avr/interrupt.h>
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#include <avr/eeprom.h>
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#include <avr/sleep.h>
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/*
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* This demonstrate how to use the avr_mcu_section.h file
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* The macro adds a section to the ELF file with useful
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* information for the simulator
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*/
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#include "avr_mcu_section.h"
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AVR_MCU (F_CPU, "atmega128");
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#if 0
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/*
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* This small section tells simavr to generate a VCD trace dump with changes to these
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* registers.
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* Opening it with gtkwave will show you the data being pumped out into the data register
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* UDR0, and the UDRE0 bit being set, then cleared
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*/
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const struct avr_mmcu_vcd_trace_t _mytrace[] _MMCU_ = {
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{ AVR_MCU_VCD_SYMBOL ("UDR0"), .what = (void*)&UDR0, },
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{ AVR_MCU_VCD_SYMBOL ("UDRE0"), .mask = (1 << UDRE0), .what = (void*)&UCSR0A, },
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};
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#endif // 0
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static int uart_putchar (char c, FILE *stream) {
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// if (c == '\n') uart_putchar ('\r', stream);
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loop_until_bit_is_set (UCSR0A, UDRE0);
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UDR0 = c;
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return 0;
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}
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FILE mystdout = FDEV_SETUP_STREAM (uart_putchar, NULL, _FDEV_SETUP_WRITE);
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int terminate () {
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sleep_cpu ();
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return 0;
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}
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