avr/avr_demo
avr/avr_demo
1
0
Fork 0
mirror of synced 2025-07-03 11:56:56 +02:00
Code Releases Activity

Use Triple-A libraries instead.

Browse source
This commit is contained in:
Mika Tuupola 2012-01-22 16:31:47 +02:00
parent d0df80b533
commit 93ac6d434f
11 changed files with 568 additions and 647 deletions
Download patch file Download diff file Expand all files Collapse all files

74
74hc165_shiftin/shift/shift.c Normal file
View file

@ -0,0 +1,74 @@
/*
* shift.c
*
* This file is part of Triple-A library:
* https://github.com/tuupola/triple-a
*
* Copyright 2011-2012 Mika Tuupola
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
*/
#include "pins/digital.h"
#include "shift/shift.h"
/* Assumes MSB first. */
uint8_t shift_in(void) {
uint8_t byte = 0;
uint8_t pin_value;
for(int i=0; i<8; i++) {
pin_value = digital_read(SHIFT_IN_DATA);
byte |= (pin_value << ((8 - 1) - i));
#ifdef DEBUG
printf("%d = %d \n", ((8 - 1) - i), pin_value);
#endif
/* Pulse clock to write next bit. */
digital_write(SHIFT_IN_CLOCK, LOW);
digital_write(SHIFT_IN_CLOCK, HIGH);
}
return byte;
}
void shift_in_latch(void) {
digital_write(SHIFT_IN_LATCH, LOW);
digital_write(SHIFT_IN_LATCH, HIGH);
}
void shift_in_init(void) {
pin_mode(SHIFT_OUT_LATCH, OUTPUT);
pin_mode(SHIFT_OUT_CLOCK, OUTPUT);
pin_mode(SHIFT_OUT_DATA, INPUT);
}
/* Assumes MSB first. */
void shift_out(uint8_t data) {
for(uint8_t i = 0; i < 8; i++) {
/* Write bit to data port. */
if (0 == (data & _BV(7 - i))) {
digital_write(SHIFT_OUT_DATA, LOW);
} else {
digital_write(SHIFT_OUT_DATA, HIGH);
}
/* Pulse clock to write next bit. */
digital_write(SHIFT_OUT_CLOCK, LOW);
digital_write(SHIFT_OUT_CLOCK, HIGH);
}
}
void shift_out_latch(void) {
digital_write(SHIFT_OUT_LATCH, LOW);
digital_write(SHIFT_OUT_LATCH, HIGH);
}
void shift_out_init(void) {
pin_mode(SHIFT_OUT_LATCH, OUTPUT);
pin_mode(SHIFT_OUT_CLOCK, OUTPUT);
pin_mode(SHIFT_OUT_DATA, OUTPUT);
}

33
74hc165_shiftin/shift/shift.h Normal file
View file

@ -0,0 +1,33 @@
/*
* shift.h
*
* This file is part of Triple-A library:
* https://github.com/tuupola/triple-a
*
* Copyright 2011-2012 Mika Tuupola
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
*/
#ifndef SHIFT_H
#define SHIFT_H
/* Configure ports here. */
#define SHIFT_IN_LATCH B0
#define SHIFT_IN_DATA B2
#define SHIFT_IN_CLOCK B1
#define SHIFT_OUT_LATCH B0
#define SHIFT_OUT_DATA B2
#define SHIFT_OUT_CLOCK B1
uint8_t shift_in(void);
void shift_in_latch(void);
void shift_in_init(void);
void shift_out(uint8_t data);
void shift_out_latch(void);
void shift_out_init(void);
#endif /* SHIFT_H */