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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;
const int pixels_pin = 2;
const int num_pixels = 8;
const PIO led_pio = pio0;
uint led_pio_sm;
static inline void put_pixel(uint32_t pixel_grb) {
pio_sm_put_blocking(led_pio, led_pio_sm, pixel_grb << 8u);
}
static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) {
return ((uint32_t) (r) << 8) | ((uint32_t) (g) << 16) | (uint32_t) (b);
}
int main()
{
DmxInput dmx_in;
uint offset;
uint8_t dmxbuf[512];
uint32_t pixelbuf[num_pixels];
int i;
int blink = 1;
/* Initialise DMX */
dmx_in.begin(dmx_rx_pin, 1, 512);
/* Initialise Neopixels */
led_pio_sm = pio_claim_unused_sm(led_pio, true);
offset = pio_add_program(led_pio, &ws2812_program);
ws2812_program_init(led_pio, led_pio_sm, offset, pixels_pin, 800000, false);
/* Status LED */
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
for ( i=0; i<num_pixels; i++ ) {
pixelbuf[i] = 0x00000000; /* (W)GRB */
}
while (1) {
dmx_in.read(dmxbuf);
for ( i=0; i<num_pixels; i++) {
pixelbuf[i] = urgb_u32(dmxbuf[1+3*i+0],
dmxbuf[1+3*i+1],
dmxbuf[1+3*i+2]);
}
for ( i=0; i<num_pixels; i++) {
put_pixel(pixelbuf[i]);
}
gpio_put(PICO_DEFAULT_LED_PIN, blink);
blink = 1 - blink;
//sleep_us(100000);
}
}
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