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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;
uint dma_chan;
};
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);
}
uint dma_chan;
dma_channel_config dma_conf;
struct pixel_strip pxs[8];
int n_pxs;
int cur_strip = 0;
static void set_dma()
{
channel_config_set_dreq(&dma_conf,
pio_get_dreq(pxs[cur_strip].pio, pxs[cur_strip].pio_sm, true));
dma_channel_configure(dma_chan, &dma_conf,
&pxs[cur_strip].pio->txf[pxs[cur_strip].pio_sm],
pxs[cur_strip].pixelbuf,
pxs[cur_strip].num_pixels,
true);
}
static int64_t next_strip(alarm_id_t id, void *vp)
{
cur_strip++;
if ( cur_strip >= n_pxs ) cur_strip = 0;
set_dma();
return 0;
}
static void dma_complete()
{
if ( dma_hw->ints0 & 1<<dma_chan ) {
dma_hw->ints0 = 1<<dma_chan;
add_alarm_in_us(400, next_strip, NULL, true);
}
}
static void init_pixel_strip(struct pixel_strip *p, PIO pio, int sm)
{
int i;
for ( i=0; i<p->num_pixels; i++ ) {
p->pixelbuf[i] = 0;
}
p->pio = pio;
p->pio_sm = sm;
p->offset = pio_add_program(p->pio, &ws2812_program);
ws2812_program_init(p->pio, p->pio_sm, p->offset, p->pin, 800000, p->rgbw);
pio_sm_set_enabled(pio, sm, false);
pio_sm_clear_fifos(pio, sm);
pio_sm_restart(pio, sm);
pio_sm_set_enabled(pio, sm, true);
}
int main()
{
DmxInput dmx_in;
uint8_t dmxbuf[512];
int i;
int blink = 1;
/* Initialise DMX */
dmx_in.begin(dmx_rx_pin, 1, 512);
pxs[0].pin = 2;
pxs[0].num_pixels = 8;
pxs[0].rgbw = false;
pxs[1].pin = 3;
pxs[1].num_pixels = 1;
pxs[1].rgbw = true;
n_pxs = 2;
/* Initialise Neopixels */
init_pixel_strip(&pxs[0], pio0, 0);
init_pixel_strip(&pxs[1], pio0, 1);
/* Start DMA */
dma_chan = dma_claim_unused_channel(true);
dma_conf = dma_channel_get_default_config(dma_chan);
channel_config_set_read_increment(&dma_conf, true);
channel_config_set_write_increment(&dma_conf, false);
irq_set_exclusive_handler(DMA_IRQ_0, dma_complete);
dma_channel_set_irq0_enabled(dma_chan, true);
irq_set_enabled(DMA_IRQ_0, true);
set_dma();
/* Status LED */
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
int loop = 0;
while (1) {
//dmx_in.read(dmxbuf);
//int dmxpos = 1; /* Numbering starts at 1 */
for ( i=0; i<pxs[0].num_pixels; i++) {
pxs[0].pixelbuf[i] = urgb_u32(32, 0, 0);
}
for ( i=0; i<pxs[1].num_pixels; i++) {
pxs[1].pixelbuf[i] = wrgb_u32(0, 64, 0, 0);
}
gpio_put(PICO_DEFAULT_LED_PIN, blink);
loop++;
if ( loop > 1000000 ) {
loop = 0;
blink = 1 - blink;
}
}
}
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