litex/software/videomixer/dvisamplerX.c

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C
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#include <stdio.h>
#include <stdlib.h>
#include <irq.h>
#include <uart.h>
#include <hw/csr.h>
#include <hw/flags.h>
#include "dvisamplerX.h"
#define FRAMEBUFFER_COUNT 4
#define FRAMEBUFFER_MASK (FRAMEBUFFER_COUNT - 1)
static unsigned int dvisamplerX_framebuffers[FRAMEBUFFER_COUNT][640*480] __attribute__((aligned(16)));
static int dvisamplerX_fb_slot_indexes[2];
static int dvisamplerX_next_fb_index;
void dvisamplerX_isr(void)
{
int fb_index = -1;
if(dvisamplerX_dma_slot0_status_read() == DVISAMPLER_SLOT_PENDING) {
fb_index = dvisamplerX_fb_slot_indexes[0];
dvisamplerX_fb_slot_indexes[0] = dvisamplerX_next_fb_index;
dvisamplerX_dma_slot0_address_write((unsigned int)dvisamplerX_framebuffers[dvisamplerX_next_fb_index]);
dvisamplerX_dma_slot0_status_write(DVISAMPLER_SLOT_LOADED);
dvisamplerX_next_fb_index = (dvisamplerX_next_fb_index + 1) & FRAMEBUFFER_MASK;
}
if(dvisamplerX_dma_slot1_status_read() == DVISAMPLER_SLOT_PENDING) {
fb_index = dvisamplerX_fb_slot_indexes[1];
dvisamplerX_fb_slot_indexes[1] = dvisamplerX_next_fb_index;
dvisamplerX_dma_slot1_address_write((unsigned int)dvisamplerX_framebuffers[dvisamplerX_next_fb_index]);
dvisamplerX_dma_slot1_status_write(DVISAMPLER_SLOT_LOADED);
dvisamplerX_next_fb_index = (dvisamplerX_next_fb_index + 1) & FRAMEBUFFER_MASK;
}
if(fb_index != -1)
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fb_dmaX_base_write((unsigned int)dvisamplerX_framebuffers[fb_index]);
}
void dvisamplerX_init_video(void)
{
unsigned int mask;
dvisamplerX_dma_ev_pending_write(dvisamplerX_dma_ev_pending_read());
dvisamplerX_dma_ev_enable_write(0x3);
mask = irq_getmask();
mask |= 1 << DVISAMPLERX_INTERRUPT;
irq_setmask(mask);
dvisamplerX_dma_frame_size_write(sizeof(dvisamplerX_framebuffers[0]));
dvisamplerX_fb_slot_indexes[0] = 0;
dvisamplerX_dma_slot0_address_write((unsigned int)dvisamplerX_framebuffers[0]);
dvisamplerX_dma_slot0_status_write(DVISAMPLER_SLOT_LOADED);
dvisamplerX_fb_slot_indexes[1] = 1;
dvisamplerX_dma_slot1_address_write((unsigned int)dvisamplerX_framebuffers[1]);
dvisamplerX_dma_slot1_status_write(DVISAMPLER_SLOT_LOADED);
dvisamplerX_next_fb_index = 2;
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fb_dmaX_base_write((unsigned int)dvisamplerX_framebuffers[3]);
}
static int dvisamplerX_d0, dvisamplerX_d1, dvisamplerX_d2;
void dvisamplerX_print_status(void)
{
printf("dvisamplerX: ph:%4d %4d %4d // charsync:%d%d%d [%d %d %d] // chansync:%d // res:%dx%d\n",
dvisamplerX_d0, dvisamplerX_d1, dvisamplerX_d2,
dvisamplerX_data0_charsync_char_synced_read(),
dvisamplerX_data1_charsync_char_synced_read(),
dvisamplerX_data2_charsync_char_synced_read(),
dvisamplerX_data0_charsync_ctl_pos_read(),
dvisamplerX_data1_charsync_ctl_pos_read(),
dvisamplerX_data2_charsync_ctl_pos_read(),
dvisamplerX_chansync_channels_synced_read(),
dvisamplerX_resdetection_hres_read(),
dvisamplerX_resdetection_vres_read());
}
void dvisamplerX_calibrate_delays(void)
{
dvisamplerX_data0_cap_dly_ctl_write(DVISAMPLER_DELAY_CAL);
dvisamplerX_data1_cap_dly_ctl_write(DVISAMPLER_DELAY_CAL);
dvisamplerX_data2_cap_dly_ctl_write(DVISAMPLER_DELAY_CAL);
while(dvisamplerX_data0_cap_dly_busy_read()
|| dvisamplerX_data1_cap_dly_busy_read()
|| dvisamplerX_data2_cap_dly_busy_read());
dvisamplerX_data0_cap_dly_ctl_write(DVISAMPLER_DELAY_RST);
dvisamplerX_data1_cap_dly_ctl_write(DVISAMPLER_DELAY_RST);
dvisamplerX_data2_cap_dly_ctl_write(DVISAMPLER_DELAY_RST);
dvisamplerX_data0_cap_phase_reset_write(1);
dvisamplerX_data1_cap_phase_reset_write(1);
dvisamplerX_data2_cap_phase_reset_write(1);
dvisamplerX_d0 = dvisamplerX_d1 = dvisamplerX_d2 = 0;
}
void dvisamplerX_adjust_phase(void)
{
switch(dvisamplerX_data0_cap_phase_read()) {
case DVISAMPLER_TOO_LATE:
dvisamplerX_data0_cap_dly_ctl_write(DVISAMPLER_DELAY_DEC);
dvisamplerX_d0--;
dvisamplerX_data0_cap_phase_reset_write(1);
break;
case DVISAMPLER_TOO_EARLY:
dvisamplerX_data0_cap_dly_ctl_write(DVISAMPLER_DELAY_INC);
dvisamplerX_d0++;
dvisamplerX_data0_cap_phase_reset_write(1);
break;
}
switch(dvisamplerX_data1_cap_phase_read()) {
case DVISAMPLER_TOO_LATE:
dvisamplerX_data1_cap_dly_ctl_write(DVISAMPLER_DELAY_DEC);
dvisamplerX_d1--;
dvisamplerX_data1_cap_phase_reset_write(1);
break;
case DVISAMPLER_TOO_EARLY:
dvisamplerX_data1_cap_dly_ctl_write(DVISAMPLER_DELAY_INC);
dvisamplerX_d1++;
dvisamplerX_data1_cap_phase_reset_write(1);
break;
}
switch(dvisamplerX_data2_cap_phase_read()) {
case DVISAMPLER_TOO_LATE:
dvisamplerX_data2_cap_dly_ctl_write(DVISAMPLER_DELAY_DEC);
dvisamplerX_d2--;
dvisamplerX_data2_cap_phase_reset_write(1);
break;
case DVISAMPLER_TOO_EARLY:
dvisamplerX_data2_cap_dly_ctl_write(DVISAMPLER_DELAY_INC);
dvisamplerX_d2++;
dvisamplerX_data2_cap_phase_reset_write(1);
break;
}
}
int dvisamplerX_init_phase(void)
{
int o_d0, o_d1, o_d2;
int i, j;
for(i=0;i<100;i++) {
o_d0 = dvisamplerX_d0;
o_d1 = dvisamplerX_d1;
o_d2 = dvisamplerX_d2;
for(j=0;j<1000;j++)
dvisamplerX_adjust_phase();
if((abs(dvisamplerX_d0 - o_d0) < 4) && (abs(dvisamplerX_d1 - o_d1) < 4) && (abs(dvisamplerX_d2 - o_d2) < 4))
return 1;
}
return 0;
}
static int dvisamplerX_locked;
static int elapsed(int period)
{
static int last_event;
int t, dt;
t = timer0_reload_read() - timer0_value_read(); // TODO: atomic read
dt = t - last_event;
if(dt < 0)
dt += timer0_reload_read();
if((dt > period) || (dt < 0)) {
last_event = t;
return 1;
} else
return 0;
}
void dvisamplerX_service(void)
{
int ret;
if(dvisamplerX_locked) {
if(dvisamplerX_clocking_locked_read()) {
if(elapsed(identifier_frequency_read())) {
dvisamplerX_adjust_phase();
dvisamplerX_print_status();
}
} else {
printf("dvisamplerX: lost PLL lock\n");
dvisamplerX_locked = 0;
}
} else {
if(dvisamplerX_clocking_locked_read()) {
printf("dvisamplerX: PLL locked\n");
dvisamplerX_calibrate_delays();
printf("dvisamplerX: delays calibrated\n");
ret = dvisamplerX_init_phase();
if(ret)
printf("dvisamplerX: phase init OK\n");
else
printf("dvisamplerX: phase did not settle\n");
dvisamplerX_print_status();
dvisamplerX_locked = 1;
} else {
if(elapsed(identifier_frequency_read()/4)) {
dvisamplerX_clocking_pll_reset_write(1);
while(!elapsed(identifier_frequency_read()/16));
dvisamplerX_clocking_pll_reset_write(0);
}
}
}
}