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Erik Strand
strandstring
Commits
c9aca3f7
Commit
c9aca3f7
authored
May 07, 2019
by
Erik Strand
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Add Arduino version
This uses the Arduino IDE to build, but doesn't use a bootloader.
parent
959d4274
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c9aca3f7
//
//
// serial_button.c
//
// 115200 baud FTDI connection that outputs '0' or '1' depending
// on the state of a physical button
//
// set lfuse to 0x5E for 20 MHz xtal
//
// Neil Gershenfeld
// 12/8/10
// Erik Strand
// 11/26/2018
//
#include <avr/io.h>
#include <util/delay.h>
#include <avr/pgmspace.h>
#include "OneWire.h"
#define output(directions,pin) (directions |= pin) // set port direction for output
#define set(port,pin) (port |= pin) // set port pin
#define clear(port,pin) (port &= (~pin)) // clear port pin
#define pin_test(pins,pin) (pins & pin) // test for port pin
#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set
#define bit_delay_time 8.5 // bit delay for 115200 with overhead
#define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay
#define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay
#define char_delay() _delay_ms(10) // char delay
#define delay(duration) _delay_ms(duration); // drop-in replacement for Arduino delay
#define serial_port PORTA
#define serial_direction DDRA
#define serial_pins PINA
#define serial_pin_in (1 << PA0)
#define serial_pin_out (1 << PA1)
#define led_pin (1 << PB2)
#define button_pin (1 << PA7)
#define max_buffer 25
void
put_char
(
volatile
unsigned
char
*
port
,
unsigned
char
pin
,
char
txchar
)
{
//
// send character in txchar on port pin
// assumes line driver (inverts bits)
//
// start bit
//
clear
(
*
port
,
pin
);
bit_delay
();
//
// unrolled loop to write data bits
//
if
bit_test
(
txchar
,
0
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
1
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
2
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
3
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
4
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
5
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
6
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
if
bit_test
(
txchar
,
7
)
set
(
*
port
,
pin
);
else
clear
(
*
port
,
pin
);
bit_delay
();
//
// stop bit
//
set
(
*
port
,
pin
);
bit_delay
();
//
// char delay
//
bit_delay
();
}
void
put_string
(
volatile
unsigned
char
*
port
,
unsigned
char
pin
,
char
*
str
)
{
//
// print a null-terminated string
//
static
int
index
;
index
=
0
;
do
{
put_char
(
port
,
pin
,
str
[
index
]);
++
index
;
}
while
(
str
[
index
]
!=
0
);
}
void
setup
(
void
)
{
// Set clock divider to 1.
CLKPR
=
(
1
<<
CLKPCE
);
CLKPR
=
(
0
<<
CLKPS3
)
|
(
0
<<
CLKPS2
)
|
(
0
<<
CLKPS1
)
|
(
0
<<
CLKPS0
);
// Initialize output pins.
set
(
serial_port
,
serial_pin_out
);
output
(
serial_direction
,
serial_pin_out
);
// Configure led pin as an output.
DDRB
|=
led_pin
;
// Configure button_pin as an input.
DDRA
&=
~
button_pin
;
// Activate button_pin's pullup resistor.
PORTA
|=
button_pin
;
}
void
loop
()
{
// Turn on the LED when the button is pressed.
if
(
PINA
&
button_pin
)
{
// Turn off the LED.
PORTB
&=
~
led_pin
;
put_char
(
&
serial_port
,
serial_pin_out
,
'0'
);
}
else
{
PORTB
|=
led_pin
;
put_char
(
&
serial_port
,
serial_pin_out
,
'1'
);
}
_delay_us
(
10000
);
}
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