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/*
* Simple ShiftBrite interface code for remoodlamp firmware
* Copyright 2012 (C) Johannes Kroll <jkroll at lavabit com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with This program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <avr/interrupt.h>
#include <avr/io.h>
#include <stdint.h>
#include <string.h>
#include <util/delay.h>
#include <stdio.h>
#include <inttypes.h>
#include "serial.h"
/* shiftbrites connected to header labeled as 'aux', setup:
PC0 -> CI (clock)
PC1 -> LI (latch)
PC2 -> DI (data) */
#define SBCI (1<<PC0)
#define SBLI (1<<PC1)
#define SBDI (1<<PC2)
#define MAXSHIFTBRITES 16
typedef struct rgb
{
uint16_t r, g, b; /* 10-bit values */
} rgb_t;
static volatile rgb_t sb_colors[MAXSHIFTBRITES];
/* number of connected shiftbrites
(automatically updated in sb_setcolor) */
static volatile uint8_t sb_num_shiftbrites= 3;
/* index of next shiftbrite register to be shifted out
used by sb_pwmtick */
static uint8_t sb_shiftidx;
/* toggle the latch so the shiftbrites accept new values */
static void sb_toggle_latch(void)
{
PORTC |= SBLI;
_delay_us(15);
PORTC &= ~SBLI;
_delay_us(15);
}
/* shift out one 32-bit shiftbrite register. */
static void sb_shiftout(uint32_t val)
{
const unsigned clkdelay = 0;
for(int8_t i = 31; i>=0; i--) {
_delay_us(clkdelay);
PORTC&= ~SBCI; /* clock lo */
if((val>>i)&1)
PORTC|= SBDI; /* data bit */
else
PORTC&= ~SBDI;
_delay_us(clkdelay);
PORTC|= SBCI; /* clock hi */
}
}
#if 0
/* shift out all color values to connected shiftbrites */
static void sb_update_all_colors(void)
{
for(int i = sb_num_shiftbrites-1; i>=0; i--)
sb_shiftout( (uint32_t)sb_colors[i].g | ((uint32_t)sb_colors[i].r<<10) | ((uint32_t)sb_colors[i].b<<20) );
sb_toggle_latch();
}
#endif
/* set the color of a shiftbrite. */
void sb_setcolor(uint8_t lamp_index, uint8_t r, uint8_t g, uint8_t b)
{
if(lamp_index >= MAXSHIFTBRITES) return;
if(lamp_index+1 > sb_num_shiftbrites) sb_num_shiftbrites= lamp_index+1;
sb_colors[lamp_index].r= (uint16_t)r*r>>6;
sb_colors[lamp_index].g= (uint16_t)g*g>>6;
sb_colors[lamp_index].b= (uint16_t)b*b>>6;
/*
updates are now done in sb_tick()
sb_update_all_colors();
*/
}
/* write default values to config registers of all shiftbrites */
static void sb_set_default_config_values(void)
{
for(int i= 0; i<sb_num_shiftbrites; i++)
sb_shiftout( (uint32_t)(100) | ((uint32_t)(120)<<10) | ((uint32_t)(100)<<20) | ((uint32_t)1<<30) );
sb_toggle_latch();
}
/* shift out a shiftbrite register, or toggle latch once finished
to be called from pwm worker loop */
void sb_tick(void)
{
sb_shiftidx= (sb_shiftidx+1)%(sb_num_shiftbrites+1);
if(sb_shiftidx==sb_num_shiftbrites)
sb_toggle_latch();
else
{
int i= sb_num_shiftbrites-sb_shiftidx-1;
sb_shiftout( (uint32_t)(sb_colors[i].g&0x3FF) | ((uint32_t)(sb_colors[i].r&0x3FF)<<10) | ((uint32_t)(sb_colors[i].b&0x3FF)<<20) );
}
}
/* setup port for shiftbrites */
void sb_init(void)
{
PORTC= 0;
DDRC= SBCI | SBLI | SBDI;
sb_set_default_config_values();
}
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