avr/avr_demo
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Use Triple-A shifting library instead.

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This commit is contained in:
Mika Tuupola 2012-01-15 20:04:13 +02:00
parent 6f11fafbef
commit d0df80b533
5 changed files with 104 additions and 42 deletions
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2
tpic6b595_shiftout/Makefile
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@ -51,7 +51,7 @@ FORMAT = ihex
TARGET = main
# List C source files here. (C dependencies are automatically generated.)
SRC = $(TARGET).c uart/uart_async.c
SRC = $(TARGET).c uart/uart_async.c shift/shift.c
# List Assembler source files here.
# Make them always end in a capital .S. Files ending in a lowercase .s

44
tpic6b595_shiftout/main.c
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@ -23,7 +23,7 @@
*
* To compile and upload run: make clean; make; make program;
*
* Copyright 2011 Mika Tuupola
* Copyright 2011-2012 Mika Tuupola
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
@ -36,42 +36,11 @@
#include "main.h"
#include "uart/uart.h"
#include "pins/digital.h"
//#define LATCH 10 /* RCK */
//#define DATA 11 /* SER IN */
//#define CLOCK 13 /* SRCK */
#define LATCH B0 /* RCK */
#define DATA B2 /* SER IN */
#define CLOCK B1 /* SRCK */
static void init(void) {
pin_mode(LATCH, OUTPUT);
pin_mode(CLOCK, OUTPUT);
pin_mode(DATA, OUTPUT);
}
/* 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(DATA, LOW);
} else {
digital_write(DATA, HIGH);
}
/* Pulse clock input to write next bit. */
digital_write(CLOCK, LOW);
digital_write(CLOCK, HIGH);
}
}
#include "shift/shift.h"
int main(void) {
init();
shift_out_init();
uart_init();
stdout = &uart_output;
stdin = &uart_input;
@ -80,8 +49,7 @@ int main(void) {
/* Show pattern for 5 seconds. */
shift_out(0b10101010);
shift_out(0b11110000);
digital_write(LATCH, LOW);
digital_write(LATCH, HIGH);
shift_out_latch();
_delay_ms(5000);
while (1) {
@ -96,9 +64,7 @@ int main(void) {
shift_out(i & 0xff);
/* Pulse latch to transfer data from shift registers */
/* to storage registers (should this be inside shift_out()?). */
digital_write(LATCH, LOW);
digital_write(LATCH, HIGH);
shift_out_latch();
_delay_ms(50);
}

2
tpic6b595_shiftout/main.h
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@ -1,3 +1 @@
static void init(void);
void shift_out(uint8_t data);
int main(void);

68
tpic6b595_shiftout/shift/shift.c Normal file
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@ -0,0 +1,68 @@
/*
* shift.c
*
* 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));
/* printf("%d = %d \n", ((8 - 1) - i), pin_value); */
/* 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);
}

30
tpic6b595_shiftout/shift/shift.h Normal file
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@ -0,0 +1,30 @@
/*
* shift.h
*
* 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 B3
#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 */