litex/software/videomixer/main.c

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#include <stdio.h>
#include <stdlib.h>
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#include <irq.h>
#include <uart.h>
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#include <hw/csr.h>
#include <hw/flags.h>
#include <console.h>
#include "time.h"
#include "dvisampler0.h"
#include "dvisampler1.h"
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static int scale_pot(int raw, int range)
{
int pot_min = 64000;
int pot_max = 103000;
int scaled;
scaled = range*(raw - pot_min)/(pot_max - pot_min);
if(scaled < 0)
scaled = 0;
if(scaled > range)
scaled = range;
return scaled;
}
static void pots_service(void)
{
static int last_event;
int blackout;
int crossfade;
if(elapsed(&last_event, identifier_frequency_read()/32)) {
pots_start_busy_write(1);
while(pots_start_busy_read());
blackout = scale_pot(pots_res0_read(), 256);
crossfade = scale_pot(pots_res1_read(), 255);
fb_blender_f0_write(crossfade*blackout >> 8);
fb_blender_f1_write((255-crossfade)*blackout >> 8);
}
}
static void fb_service(void)
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{
int c;
if(readchar_nonblock()) {
c = readchar();
if(c == '1') {
fb_enable_write(1);
printf("Framebuffer is ON\n");
} else if(c == '0') {
fb_enable_write(0);
printf("Framebuffer is OFF\n");
}
}
}
int main(void)
{
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irq_setmask(0);
irq_setie(1);
uart_init();
puts("Minimal video mixer software built "__DATE__" "__TIME__"\n");
time_init();
dvisampler0_init_video();
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dvisampler1_init_video();
fb_enable_write(1);
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while(1) {
dvisampler0_service();
dvisampler1_service();
pots_service();
fb_service();
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}
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return 0;
}