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 <time.h>
#include <generated/csr.h>
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#include <hw/flags.h>
#include <console.h>
#include "config.h"
#include "ci.h"
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#include "processor.h"
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#ifdef POTS_BASE
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 regular_blend(int p0, int p1)
{
int blackout;
int crossfade;
blackout = scale_pot(p0, 256);
crossfade = scale_pot(p1, 255);
fb_blender_f0_write(crossfade*blackout >> 8);
fb_blender_f1_write((255-crossfade)*blackout >> 8);
}
static void additive_blend(int p0, int p1)
{
fb_blender_f0_write(scale_pot(p0, 255));
fb_blender_f1_write(scale_pot(p1, 255));
}
static void ui_service(void)
{
static int last_event;
static int additive_blend_enabled;
static int old_btn;
int btn;
int p0, p1;
if(elapsed(&last_event, identifier_frequency_read()/32)) {
btn = buttons_in_read() & 0x1;
if(btn && !old_btn) {
additive_blend_enabled = !additive_blend_enabled;
if(additive_blend_enabled)
leds_out_write(leds_out_read() | 0x1);
else
leds_out_write(leds_out_read() & ~0x1);
}
old_btn = btn;
pots_start_busy_write(1);
while(pots_start_busy_read());
p0 = pots_res0_read();
p1 = pots_res1_read();
if(!additive_blend_enabled)
regular_blend(p0, p1);
else
additive_blend(p0, p1);
}
}
#else
static void ui_service(void)
{
fb_blender_f0_write(0xff);
fb_blender_f1_write(0xff);
}
#endif
int main(void)
{
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irq_setmask(0);
irq_setie(1);
uart_init();
printf("Mixxeo software rev. %08x built "__DATE__" "__TIME__"\n\n", MSC_GIT_ID);
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config_init();
time_init();
processor_start(config_get(CONFIG_KEY_RESOLUTION));
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while(1) {
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processor_service();
ui_service();
ci_service();
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}
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return 0;
}