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/*
* pixelhub.c
*
* DMX to neopixel interface
*
* Copyright © 2023 Thomas White <taw@physics.org>
*
* 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 <pico/stdlib.h>
#include <DmxInput.h>
#include <ws2812.pio.h>
const int dmx_rx_pin = 16;
struct pixel_strip
{
int pin;
int num_pixels;
PIO pio;
uint pio_sm;
uint offset;
uint32_t pixelbuf[256];
int rgbw;
};
static inline void put_pixel(struct pixel_strip *p, uint32_t pixel_grb) {
pio_sm_put_blocking(p->pio, p->pio_sm, pixel_grb);
}
static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) {
return ((uint32_t)(g)<<24) | ((uint32_t)(r)<<16) | ((uint32_t)(b)<<8);
}
static inline uint32_t wrgb_u32(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
return ((uint32_t)(g)<<24) | ((uint32_t)(r)<<16) | ((uint32_t)(b)<<8) | (uint32_t)(w);
}
static void init_pixel_strip(struct pixel_strip *p)
{
int i;
p->pio_sm = pio_claim_unused_sm(p->pio, true);
p->offset = pio_add_program(p->pio, &ws2812_program);
ws2812_program_init(p->pio, p->pio_sm, p->offset, p->pin, 800000, p->rgbw);
for ( i=0; i<p->num_pixels; i++ ) {
p->pixelbuf[i] = 0;
}
}
int main()
{
DmxInput dmx_in;
struct pixel_strip p1;
struct pixel_strip p2;
uint8_t dmxbuf[512];
int i;
int blink = 1;
p1.pin = 2;
p1.num_pixels = 8;
p1.rgbw = false;
p1.pio = pio0;
p2.pin = 3;
p2.num_pixels = 1;
p2.rgbw = true;
p2.pio = pio0;
/* Initialise DMX */
dmx_in.begin(dmx_rx_pin, 1, 512);
/* Initialise Neopixels */
init_pixel_strip(&p1);
init_pixel_strip(&p2);
int npx = 8;
/* Status LED */
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
while (1) {
dmx_in.read(dmxbuf);
int dmxpos = 1; /* Numbering starts at 1 */
for ( i=0; i<p1.num_pixels; i++) {
p1.pixelbuf[i] = urgb_u32(dmxbuf[dmxpos++],
dmxbuf[dmxpos++],
dmxbuf[dmxpos++]);
}
for ( i=0; i<p2.num_pixels; i++) {
p2.pixelbuf[i] = wrgb_u32(dmxbuf[dmxpos++],
dmxbuf[dmxpos++],
dmxbuf[dmxpos++],
dmxbuf[dmxpos++]);
}
for ( i=0; i<npx; i++) {
put_pixel(&p1, p1.pixelbuf[i]);
put_pixel(&p2, p2.pixelbuf[i]);
}
gpio_put(PICO_DEFAULT_LED_PIN, blink);
blink = 1 - blink;
}
}
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