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time_display: get timing data from UDP

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This commit is contained in:
Zack Buhman 2024-06-23 12:13:19 -05:00
parent 7a0518c35b
commit e72315b787
13 changed files with 530 additions and 410 deletions
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2
.gitignore vendored
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@ -3,3 +3,5 @@
*.gch
*.d
main
serial_forwarder
time_display

15
Makefile
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@ -13,20 +13,27 @@ DEPFLAGS = -MMD -MP
OPT = -O3 -march=native
OBJS = \
timer.o
SERIAL_FORWARDER_OBJS = \
serial_forwarder.o \
serial.o \
parse_serial.o
all: serial_forwarder
TIME_DISPLAY_OBJS = \
time_display.o
all: serial_forwarder time_display
clean:
rm -f *.o *.d *.gch
rm -f serial_forwarder time_display
%.o: %.c
$(CC) $(CARCH) $(CFLAGS) $(OPT) $(DEBUG) $(DEPFLAGS) -MF ${<}.d -c $< -o $@
serial_forwarder: $(SERIAL_FORWARDER_OBJS)
$(CC) $^ -o $@
time_display: $(TIME_DISPLAY_OBJS)
$(CC) $(LDFLAGS) $^ -o $@
-include $(shell find -type f -name '*.d')

4
event.h
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@ -1,4 +0,0 @@
enum command {
CMD_NOP,
CMD_STATE_TRANSFER,
};

0
link.c Normal file
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10
link.h Normal file
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@ -0,0 +1,10 @@
#pragma once
#include <stdint.h>
struct link_state {
uint64_t send_sequence;
uint64_t recv_sequence;
struct timespec send_ping;
struct timespec recv_ping;
};

71
packet.h
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@ -1,42 +1,47 @@
#pragma once
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
typedef _Float64 float64_t;
#include "timer.h"
enum packet_type {
PACKET_TYPE__TIME_START = 0x2112858517,
PACKET_TYPE__TIME_STOP = 0xdf75d3f8,
PACKET_TYPE__RTT_DELAY = 0xc7065931,
PACKET_TYPE__ACK = 0xfde7959f,
};
#define EVENT_TYPE__INVALID 0x00000000
#define EVENT_TYPE__TIME_START 0x12858517
#define EVENT_TYPE__TIME_STOP 0xdf75d3f8
#define EVENT_TYPE__RTT_DELAY 0xc7065931
#define EVENT_TYPE__PING 0x0ba0d4c2
#define EVENT_TYPE__ACK 0xfde7959f
struct time_stop_data {
uint32_t integer_value;
uint32_t fraction_value;
uint16_t integer_digits;
uint16_t fraction_digits;
} __attribute__((__packed__));
static_assert((sizeof (struct timespec)) == 8 + 8);
static_assert((sizeof (struct time_stop_data)) == 4 * 3);
struct rtt_delay_data {
float64_t offset;
} __attribute__((__packed__));
struct ack_data {
uint64_t seq;
} __attribute__((__packed__));
static_assert((sizeof (struct rtt_delay_data)) == 8);
struct timing_packet {
struct event {
uint32_t type;
union {
struct time_stop_data time_stop;
struct rtt_delay_data rtt_delay;
struct ack_data ack;
uint32_t sequence;
};
} __attribute__((__packed__));
static_assert((sizeof (struct timing_packet)) == 4 * 4);
struct packet_stopwatch {
struct event event;
struct stopwatch_time stopwatch_time;
};
static_assert((sizeof (struct packet_stopwatch)) ==
(sizeof (struct event)) + (sizeof (struct stopwatch_time)));
struct packet_start {
struct event event;
};
static_assert((sizeof (struct packet_start)) == (sizeof (struct event)));
struct packet_ack {
struct event event;
};
static_assert((sizeof (struct packet_ack)) == (sizeof (struct event)));
struct packet_rtt_delay {
struct event event;
struct timespec offset;
};
static_assert((sizeof (struct packet_rtt_delay)) == (sizeof (struct event)) + (sizeof (struct timespec)));

25
parse_serial.c
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@ -80,34 +80,35 @@ bool is_timer_resume(uint8_t const * const buf, int length)
return false;
}
bool handle_line(uint8_t const * const buf, int length,
uint32_t handle_line(uint8_t const * const buf, int length,
struct timer_state * timer_state)
{
if (length == 0) {
timer_state->status = TIMER_RUNNING;
int ret = clock_gettime(CLOCK_MONOTONIC, &timer_state->counter.start);
int ret = clock_gettime(CLOCK_MONOTONIC_RAW, &timer_state->counter.start);
assert(ret != -1);
timer_state->counter.offset.tv_sec = 0;
timer_state->counter.offset.tv_nsec = 0;
assert(ret != -1);
return true;
} else if (is_timer_resume(buf, length)) {
return true;
} else {
return EVENT_TYPE__TIME_START;
} /*else if (is_timer_resume(buf, length)) {
return true; // fixme
} */ else {
int ret = parse_time(buf, length, &timer_state->time);
if (ret == 0) {
timer_state->status = TIMER_STOPPED;
return true;
return EVENT_TYPE__TIME_STOP;
}
}
return false;
}
bool handle_parse(uint8_t * read_buf, int length,
uint32_t handle_parse(uint8_t * read_buf, int length,
struct parser_state * parser_state,
struct timer_state * timer_state)
{
bool have_state_change = false;
uint32_t type = EVENT_TYPE__INVALID;
while (length > 0) {
int copy_length = min(length, BUFSIZE - parser_state->offset);
length -= copy_length;
@ -119,7 +120,7 @@ bool handle_parse(uint8_t * read_buf, int length,
while (i < parser_state->offset) {
if (parser_state->buf[i] == '\r') {
fprintf(stderr, "r at %d %d\n", i, parser_state->offset);
have_state_change |= handle_line(parser_state->buf, i,
type = handle_line(parser_state->buf, i,
timer_state);
parser_state->offset -= i + 1;
assert(parser_state->offset >= 0);
@ -135,5 +136,5 @@ bool handle_parse(uint8_t * read_buf, int length,
continue;
}
return have_state_change;
return type;
}

2
parse_serial.h
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@ -10,6 +10,6 @@ struct parser_state {
int offset;
};
bool handle_parse(uint8_t * read_buf, int length,
uint32_t handle_parse(uint8_t * read_buf, int length,
struct parser_state * parser_state,
struct timer_state * timer_state);

BIN
serial_forwarder
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155
serial_forwarder.c
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@ -8,26 +8,35 @@
#include <sys/epoll.h>
#include <sys/socket.h>
#include <sys/timerfd.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include "bufsize.h"
#include "serial.h"
#include "timer.h"
#include "parse_serial.h"
#include "packet.h"
#define PORT 4321
//#define SERIALPORT "/dev/ttyS0"
#define SERIALPORT "/dev/ttyUSB0"
//#define SERIALPORT "/dev/ttyUSB0"
#define SERIALPORT "foo.fifo"
int handle_sock(int sock)
static struct sockaddr_in6 dest_addr;
int handle_sockfd(int sockfd)
{
struct sockaddr_in src_addr;
socklen_t addrlen = (sizeof (struct sockaddr_in));
struct sockaddr_in6 src_addr;
socklen_t addrlen = (sizeof (struct sockaddr_in6));
char buf[BUFSIZE];
while (true) {
ssize_t recv_len = recvfrom(sock, buf, BUFSIZE, 0, (struct sockaddr *)&src_addr, &addrlen);
ssize_t recv_len = recvfrom(sockfd,
buf, (sizeof (buf)),
0,
(struct sockaddr *)&src_addr, &addrlen);
if (recv_len == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
perror("sock eagain");
@ -38,10 +47,10 @@ int handle_sock(int sock)
}
}
printf("got %ld data\n", recv_len);
printf("Received packet from %s:%d\n", inet_ntoa(src_addr.sin_addr), ntohs(src_addr.sin_port));
buf[recv_len] = 0;
printf("Data: %s\n", buf);
char src_addr_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &src_addr.sin6_addr, src_addr_str, INET6_ADDRSTRLEN);
printf("Received packet from %s:%d\n", src_addr_str, ntohs(src_addr.sin6_port));
printf("length: %ld\n", recv_len);
}
}
@ -86,19 +95,57 @@ int handle_timerfd(int timerfd)
return 0;
}
struct receiver_state {
uint64_t seq;
uint64_t ack_seq;
};
int send_stopwatch_event(int sockfd,
struct timer_state * timer_state,
struct link_state * link_state)
{
struct packet_stopwatch pkt;
pkt.event.type = EVENT_TYPE__TIME_STOP;
pkt.event.sequence = link_state.send_sequence++;
memcpy(&pkt.stopwatch_time, &timer_state->time, (sizeof (struct stopwatch_time)));
int handle_serialfd(int timerfd,
int ret = sendto(sockfd,
&pkt, (sizeof (struct packet_stopwatch)),
0,
(struct sockaddr *)&dest_addr,
(sizeof (struct sockaddr_in6)));
if (ret == -1) {
perror("sendto()");
}
return 0;
}
int send_start_event(int sockfd,
struct timer_state * timer_state,
struct link_state * link_state)
{
struct packet_start pkt;
pkt.event.type = EVENT_TYPE__TIME_START;
pkt.event.sequence = link_state.send_sequence++;
int ret = sendto(sockfd,
&pkt, (sizeof (struct packet_stopwatch)),
0,
(struct sockaddr *)&dest_addr,
(sizeof (struct sockaddr_in6)));
if (ret == -1) {
perror("sendto()");
}
return 0;
}
int handle_serialfd(int serialfd,
int sockfd,
struct parser_state * parser_state,
struct timer_state * timer_state)
struct timer_state * timer_state,
struct link_state * link_state)
{
uint8_t buf[BUFSIZE];
while (true) {
ssize_t len = read(timerfd, buf, (sizeof (buf)));
ssize_t len = read(serialfd, buf, (sizeof (buf)));
if (len == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
fprintf(stderr, "serialfd eagain\n");
@ -115,10 +162,26 @@ int handle_serialfd(int timerfd,
}
fprintf(stderr, "\n");
*/
bool have_state_change = handle_parse(buf, len,
uint32_t type = handle_parse(buf, len,
parser_state,
timer_state);
printf("have_state_change: %d\n", have_state_change);
int ret;
switch (type) {
case EVENT_TYPE__TIME_STOP:
ret = send_stopwatch_event(sockfd, timer_state, link_state);
if (ret == -1) {
return -1;
}
break;
case EVENT_TYPE__TIME_START:
ret = send_start_event(sockfd, timer_state, link_state);
if (ret == -1) {
return -1;
}
break;
default:
break;
}
}
return 0;
@ -128,20 +191,20 @@ int main(void)
{
int ret;
int sock = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
if (sock == -1) {
int sockfd = socket(AF_INET6, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
if (sockfd == -1) {
perror("socket");
return -1;
}
struct sockaddr_in sockaddr = {0};
sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(PORT);
sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
struct sockaddr_in6 sockaddr = {0};
sockaddr.sin6_family = AF_INET6;
sockaddr.sin6_port = htons(PORT);
sockaddr.sin6_addr = in6addr_any;
ret = bind(sock, (struct sockaddr *)&sockaddr, (sizeof (struct sockaddr_in)));
ret = bind(sockfd, (struct sockaddr *)&sockaddr, (sizeof (struct sockaddr_in6)));
if (ret == -1) {
perror("bind");
perror("sockfd bind");
return -1;
}
@ -157,8 +220,8 @@ int main(void)
{
struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = sock;
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, sock, &ev);
ev.data.fd = sockfd;
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, sockfd, &ev);
if (ret == -1) {
perror("epoll_ctl: sock");
return -1;
@ -192,10 +255,12 @@ int main(void)
perror("open: serialport");
return -1;
}
/*
ret = set_terminal_attributes(serialfd);
if (ret == -1) {
return -1;
}
*/
{
struct epoll_event ev;
@ -208,8 +273,14 @@ int main(void)
}
}
dest_addr.sin6_family = AF_INET6;
dest_addr.sin6_port = htons(1234);
ret = inet_pton(AF_INET6, "::1", &dest_addr.sin6_addr);
assert(ret == 1);
struct parser_state parser_state = {0};
struct timer_state timer_state = {0};
struct link_state link_state = {0};
while (1) {
printf("Wait for datagram\n");
@ -221,8 +292,8 @@ int main(void)
}
for (int n = 0; n < nfds; ++n) {
if (events[n].data.fd == sock) {
ret = handle_sock(sock);
if (events[n].data.fd == sockfd) {
ret = handle_sockfd(sockfd);
if (ret == -1)
return -1;
} else if (events[n].data.fd == timerfd) {
@ -232,31 +303,25 @@ int main(void)
} else if (events[n].data.fd == serialfd) {
fprintf(stderr, "handle_serialfd\n");
ret = handle_serialfd(serialfd,
sockfd,
&parser_state,
&timer_state);
if (ret == -1)
&timer_state,
&link_state);
if (ret == -1) {
return -1;
}
} else {
assert(0);
}
}
/*
struct sockaddr_in dest_addr;
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(1234);
dest_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
ret = sendto(sock, buf, 3, 0, (struct sockaddr *)&dest_addr, (sizeof (struct sockaddr_in)));
if (ret == -1) {
perror("sendto()");
}
*/
//sleep(2);
}
close(sock);
close(sockfd);
close(serialfd);
close(timerfd);
close(epollfd);
return 0;
}

358
time_display.c
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@ -1,61 +1,355 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <SDL3/SDL.h>
#include "timer.h"
#include "bufsize.h"
#include "packet.h"
struct glyph {
int32_t width;
int32_t height;
int32_t horiBearingX;
int32_t horiBearingY;
int32_t horiAdvance;
SDL_Texture * texture;
};
static struct glyph glyphs[0x80 - 0x20] = {0};
int32_t face_height;
int
load_outline_char(SDL_Renderer * renderer,
const FT_Face face,
const FT_Int32 load_flags,
const FT_Render_Mode render_mode,
const FT_ULong char_code)
{
FT_Error error;
FT_UInt glyph_index = FT_Get_Char_Index(face, char_code);
error = FT_Load_Glyph(face, glyph_index, load_flags);
if (error) {
printf("FT_Load_Glyph %s\n", FT_Error_String(error));
return -1;
}
error = FT_Render_Glyph(face->glyph, render_mode);
if (error) {
printf("FT_Render_Glyph %s\n", FT_Error_String(error));
return -1;
}
struct glyph * glyph = &glyphs[char_code - 0x20];
glyph->width = face->glyph->bitmap.width;
glyph->height = face->glyph->bitmap.rows;
glyph->horiBearingX = face->glyph->metrics.horiBearingX;
glyph->horiBearingY = face->glyph->metrics.horiBearingY;
glyph->horiAdvance = face->glyph->metrics.horiAdvance;
if (face->glyph->bitmap.pitch != 0) {
SDL_Surface * surface = SDL_CreateSurface(face->glyph->bitmap.width,
face->glyph->bitmap.rows,
SDL_PIXELFORMAT_RGBA8888);
SDL_LockSurface(surface);
for (int y = 0; y < face->glyph->bitmap.rows; y++) {
for (int x = 0; x < face->glyph->bitmap.width; x++) {
int s_ix = y * face->glyph->bitmap.pitch + x;
int d_ix = y * surface->pitch + x * 4;
uint8_t gray = face->glyph->bitmap.buffer[s_ix];
((uint8_t *)surface->pixels)[d_ix + 0] = gray;
((uint8_t *)surface->pixels)[d_ix + 1] = gray;
((uint8_t *)surface->pixels)[d_ix + 2] = gray;
((uint8_t *)surface->pixels)[d_ix + 3] = 255;
}
}
SDL_UnlockSurface(surface);
if (glyph->texture != NULL)
SDL_DestroyTexture(glyph->texture);
glyph->texture = SDL_CreateTextureFromSurface(renderer, surface);
if (glyph->texture == NULL) {
printf("%s\n", SDL_GetError());
}
assert(glyph->texture != NULL);
SDL_DestroySurface(surface);
}
return 0;
}
int load_font(SDL_Renderer * renderer, int font_size)
{
FT_Library library;
FT_Face face;
FT_Error error;
error = FT_Init_FreeType(&library);
if (error) {
printf("FT_Init_FreeType\n");
return -1;
}
error = FT_New_Face(library, "DejaVuSansMono.ttf", 0, &face);
if (error) {
printf("FT_New_Face\n");
return -1;
}
error = FT_Set_Pixel_Sizes(face, 0, font_size);
if (error) {
printf("FT_Set_Pixel_Sizes: %s %d\n", FT_Error_String(error), error);
return -1;
}
for (int char_code = 0x20; char_code <= 0x7f; char_code++) {
load_outline_char(renderer, face, FT_LOAD_DEFAULT, FT_RENDER_MODE_NORMAL, char_code);
}
printf("loaded size %ld\n", face->size->metrics.height >> 6);
face_height = face->size->metrics.height;
return 0;
}
void render(SDL_Renderer * renderer, int window_width, int window_height, const char * s, int length)
{
int32_t advance = (window_width - (window_width * 5 / 100)) << 6;
for (int i = (length - 1); i >= 0; i--) {
char c = s[i];
struct glyph * glyph = &glyphs[c - 0x20];
advance -= glyph->horiAdvance;
if (glyph->texture != NULL) {
double x = (double)(advance + glyph->horiBearingX) / 64.f;
double y = (window_height / 2) + (face_height >> 6) / 3 + ((double)glyph->horiBearingY / -64.f);
SDL_FRect srect = {
.x = 0.f,
.y = 0.f,
.w = glyph->width,
.h = glyph->height
};
SDL_FRect drect = {
.x = x,
.y = y,
.w = glyph->width,
.h = glyph->height
};
SDL_RenderTexture(renderer, glyph->texture, &srect, &drect);
}
}
}
int max(int a, int b) {
return a > b ? a : b;
}
#define BUFLEN 512
#define PORT 1234
int main(void)
void handle_buf(void * buf, ssize_t length,
struct timer_state * timer_state)
{
struct event * evt = (struct event *)buf;
switch (evt->type) {
case EVENT_TYPE__TIME_STOP:
if (length != (sizeof (struct packet_stopwatch))) {
printf("handle_buf: event_stopwatch: invalid length\n");
}
printf("handle_buf: event_stopwatch: valid length\n");
struct packet_stopwatch * time_evt = (struct packet_stopwatch *)buf;
memcpy(&timer_state->time, &time_evt->stopwatch_time, (sizeof (struct stopwatch_time)));
timer_state->status = TIMER_STOPPED;
break;
case EVENT_TYPE__TIME_START:
int ret = clock_gettime(CLOCK_MONOTONIC_RAW, &timer_state->counter.start);
assert(ret != -1);
timer_state->counter.offset.tv_sec = 0;
timer_state->counter.offset.tv_nsec = 0;
timer_state->status = TIMER_RUNNING;
break;
default:
printf("unhandled event %d\n", evt->type);
break;
}
}
int handle_sockfd(int sockfd, struct timer_state * timer_state)
{
char buf[BUFSIZE];
struct sockaddr_in6 src_addr;
socklen_t addrlen = (sizeof (struct sockaddr_in6));
while (1) {
ssize_t recv_len = recvfrom(sockfd,
buf, (sizeof (buf)),
0,
(struct sockaddr *)&src_addr, &addrlen);
if (recv_len == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
//perror("sock eagain");
return 0;
} else {
perror("recvfrom sock");
return -1;
}
}
char src_addr_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &src_addr.sin6_addr, src_addr_str, INET6_ADDRSTRLEN);
printf("Received packet from %s:%d\n", src_addr_str, ntohs(src_addr.sin6_port));
printf("length: %ld\n", recv_len);
handle_buf(buf, recv_len, timer_state);
}
return 0;
}
int main()
{
int ret;
SDL_Window * window;
SDL_Renderer * renderer;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock == -1) {
ret = SDL_Init(SDL_INIT_VIDEO);
assert(ret == 0);
window = SDL_CreateWindow("timer",
512, // w
512, // h
SDL_WINDOW_RESIZABLE);// | SDL_WINDOW_MAXIMIZED);
renderer = SDL_CreateRenderer(window, NULL);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_PropertiesID props = SDL_GetRendererProperties(renderer);
const char * name = SDL_GetRendererName(renderer);
assert(name != NULL);
printf("renderer: %s\n", name);
const SDL_PixelFormatEnum * formats = SDL_GetProperty(props, SDL_PROP_RENDERER_TEXTURE_FORMATS_POINTER, NULL);
assert(formats != NULL);
while (*formats != SDL_PIXELFORMAT_UNKNOWN) {
printf("%s\n", SDL_GetPixelFormatName(*formats++));
}
int last_width = -1;
uint64_t ticks = SDL_GetTicks();
const int min_length = 5;
int max_length = min_length;
/*
socket
*/
int sockfd = socket(AF_INET6, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
if (sockfd == -1) {
perror("socket");
return -1;
}
struct sockaddr_in sockaddr = {0};
sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(PORT);
sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
struct sockaddr_in6 sockaddr;
sockaddr.sin6_family = AF_INET6;
sockaddr.sin6_port = htons(PORT);
sockaddr.sin6_addr = in6addr_any;
ret = bind(sock, (struct sockaddr *)&sockaddr, (sizeof (struct sockaddr_in)));
ret = bind(sockfd, (struct sockaddr *)&sockaddr, (sizeof (struct sockaddr_in6)));
if (ret == -1) {
perror("bind");
return -1;
}
char buf[BUFLEN];
/*
*/
struct timer_state timer_state = {0};
while (1) {
printf("Wait for datagram\n");
handle_sockfd(sockfd, &timer_state);
struct sockaddr_in src_addr = {0};
socklen_t addrlen = (sizeof (struct sockaddr_in));
char str_buf[16];
switch (timer_state.status) {
case TIMER_STOPPED:
snprintf(str_buf, (sizeof (str_buf)) - 1, "%d.%02d", timer_state.time.integer_value, timer_state.time.fraction_value);
break;
case TIMER_RUNNING:
{
struct timespec now;
int ret = clock_gettime(CLOCK_MONOTONIC_RAW, &now);
assert(ret != -1);
ssize_t recv_len = recvfrom(sock, buf, BUFLEN, 0, (struct sockaddr *)&src_addr, &addrlen);
if (recv_len == -1) {
perror("recvfrom");
return -1;
double now_d = (double)now.tv_sec + ((double)now.tv_nsec / 1000000000.f);
struct timespec * start = &timer_state.counter.start;
double start_d = (double)start->tv_sec + ((double)start->tv_nsec / 1000000000.f);
double duration = now_d - start_d;
snprintf(str_buf, (sizeof (str_buf)) - 1, "%.02f", duration);
}
break;
default:
str_buf[0] = 0;
break;
}
int length = strlen(str_buf);
SDL_RenderClear(renderer);
int window_width;
int window_height;
ret = SDL_GetWindowSizeInPixels(window, &window_width, &window_height);
assert(ret == 0);
if ((window_width != last_width) || (length > max_length)) {
max_length = max(min_length, length);
last_width = window_width;
int divisor = max(1, (max_length * 8 / 10));
int font_size = (window_width * 95 / 100) / divisor;
printf("fs %d %d max_length: %d\n", font_size, window_width, max_length);
load_font(renderer, font_size);
}
buf[recv_len] = 0;
printf("Received packet from %s:%d\n", inet_ntoa(src_addr.sin_addr), ntohs(src_addr.sin_port));
printf("Data: %s\n", buf);
render(renderer, window_width, window_height, str_buf, length);
/*
//now reply the client with the same data
if (sendto(s, buf, recv_len, 0, (struct sockaddr*) &si_other, slen) == -1) {
die("sendto()");
}
*/
while (SDL_GetTicks() - ticks < (1000 / 60)) { SDL_Delay(1); }
SDL_RenderPresent(renderer);
ticks = SDL_GetTicks();
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_QUIT:
goto exit;
case SDL_EVENT_KEY_DOWN:
if (event.key.keysym.sym == SDLK_ESCAPE)
goto exit;
break;
default:
break;
}
close(sock);
return 0;
}
}
exit:
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
close(sockfd);
}

270
timer.c
View File

@ -1,270 +0,0 @@
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <SDL3/SDL.h>
#include <libserialport.h>
struct glyph {
int32_t width;
int32_t height;
int32_t horiBearingX;
int32_t horiBearingY;
int32_t horiAdvance;
SDL_Texture * texture;
};
static struct glyph glyphs[0x80 - 0x20] = {0};
int32_t face_height;
int
load_outline_char(SDL_Renderer * renderer,
const FT_Face face,
const FT_Int32 load_flags,
const FT_Render_Mode render_mode,
const FT_ULong char_code)
{
FT_Error error;
FT_UInt glyph_index = FT_Get_Char_Index(face, char_code);
error = FT_Load_Glyph(face, glyph_index, load_flags);
if (error) {
printf("FT_Load_Glyph %s\n", FT_Error_String(error));
return -1;
}
error = FT_Render_Glyph(face->glyph, render_mode);
if (error) {
printf("FT_Render_Glyph %s\n", FT_Error_String(error));
return -1;
}
struct glyph * glyph = &glyphs[char_code - 0x20];
glyph->width = face->glyph->bitmap.width;
glyph->height = face->glyph->bitmap.rows;
glyph->horiBearingX = face->glyph->metrics.horiBearingX;
glyph->horiBearingY = face->glyph->metrics.horiBearingY;
glyph->horiAdvance = face->glyph->metrics.horiAdvance;
if (face->glyph->bitmap.pitch != 0) {
SDL_Surface * surface = SDL_CreateSurface(face->glyph->bitmap.width,
face->glyph->bitmap.rows,
SDL_PIXELFORMAT_RGBA8888);
SDL_LockSurface(surface);
for (int y = 0; y < face->glyph->bitmap.rows; y++) {
for (int x = 0; x < face->glyph->bitmap.width; x++) {
int s_ix = y * face->glyph->bitmap.pitch + x;
int d_ix = y * surface->pitch + x * 4;
uint8_t gray = face->glyph->bitmap.buffer[s_ix];
((uint8_t *)surface->pixels)[d_ix + 0] = gray;
((uint8_t *)surface->pixels)[d_ix + 1] = gray;
((uint8_t *)surface->pixels)[d_ix + 2] = gray;
((uint8_t *)surface->pixels)[d_ix + 3] = 255;
}
}
SDL_UnlockSurface(surface);
if (glyph->texture != NULL)
SDL_DestroyTexture(glyph->texture);
glyph->texture = SDL_CreateTextureFromSurface(renderer, surface);
if (glyph->texture == NULL) {
printf("%s\n", SDL_GetError());
}
assert(glyph->texture != NULL);
SDL_DestroySurface(surface);
}
return 0;
}
int load_font(SDL_Renderer * renderer, int font_size)
{
FT_Library library;
FT_Face face;
FT_Error error;
error = FT_Init_FreeType(&library);
if (error) {
printf("FT_Init_FreeType\n");
return -1;
}
error = FT_New_Face(library, "DejaVuSansMono.ttf", 0, &face);
if (error) {
printf("FT_New_Face\n");
return -1;
}
error = FT_Set_Pixel_Sizes(face, 0, font_size);
if (error) {
printf("FT_Set_Pixel_Sizes: %s %d\n", FT_Error_String(error), error);
return -1;
}
for (int char_code = 0x20; char_code <= 0x7f; char_code++) {
load_outline_char(renderer, face, FT_LOAD_DEFAULT, FT_RENDER_MODE_NORMAL, char_code);
}
printf("loaded size %ld\n", face->size->metrics.height >> 6);
face_height = face->size->metrics.height;
return 0;
}
void render(SDL_Renderer * renderer, int window_width, int window_height, const char * s, int length)
{
int32_t advance = (window_width - (window_width * 5 / 100)) << 6;
for (int i = (length - 1); i >= 0; i--) {
char c = s[i];
struct glyph * glyph = &glyphs[c - 0x20];
advance -= glyph->horiAdvance;
if (glyph->texture != NULL) {
float x = (float)(advance + glyph->horiBearingX) / 64.f;
float y = (window_height / 2) + (face_height >> 6) / 3 + (float)(-glyph->horiBearingY) / 64.f;
SDL_FRect srect = {
.x = 0.f,
.y = 0.f,
.w = glyph->width,
.h = glyph->height
};
SDL_FRect drect = {
.x = x,
.y = y,
.w = glyph->width,
.h = glyph->height
};
SDL_RenderTexture(renderer, glyph->texture, &srect, &drect);
}
}
}
int max(int a, int b) {
return a > b ? a : b;
}
int main()
{
int ret;
SDL_Window * window;
SDL_Renderer * renderer;
ret = SDL_Init(SDL_INIT_VIDEO);
assert(ret == 0);
window = SDL_CreateWindow("timer",
512, // w
512, // h
SDL_WINDOW_RESIZABLE);// | SDL_WINDOW_MAXIMIZED);
renderer = SDL_CreateRenderer(window, NULL);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_PropertiesID props = SDL_GetRendererProperties(renderer);
const char * name = SDL_GetRendererName(renderer);
assert(name != NULL);
printf("renderer: %s\n", name);
const SDL_PixelFormatEnum * formats = SDL_GetProperty(props, SDL_PROP_RENDERER_TEXTURE_FORMATS_POINTER, NULL);
assert(formats != NULL);
while (*formats != SDL_PIXELFORMAT_UNKNOWN) {
printf("%s\n", SDL_GetPixelFormatName(*formats++));
}
int last_width = -1;
uint64_t ticks = SDL_GetTicks();
const int min_length = 4;
int max_length = min_length;
/*
*/
uint8_t read_buf[32] = {'7', '1', '.', '0', '1', '\r'};
struct state state = {0};
int i = 0;
while (1) {
i++;
//enum sp_return sp_ret = sp_nonblocking_read(port, read_buf, (sizeof (read_buf)));
enum sp_return sp_ret = 6;
if (sp_ret < 0) {
printf("sp_nonblocking_read error\n");
break;
}
handle_state(read_buf, sp_ret, &state);
char str_buf[16];
switch (state.counter_state) {
case COUNTER_STOPPED:
snprintf(str_buf, (sizeof (str_buf)) - 1, "%d.%02d", state.time.whole, state.time.fraction);
break;
case COUNTER_RUNNING:
{
uint64_t counter = SDL_GetPerformanceCounter();
uint64_t frequency = SDL_GetPerformanceFrequency();
double duration = (((double)counter) - ((double)state.counter)) / ((double)frequency);
snprintf(str_buf, (sizeof (str_buf)) - 1, "%.02f", duration);
}
break;
default:
str_buf[0] = 0;
break;
}
int length = strlen(str_buf);
SDL_RenderClear(renderer);
int window_width;
int window_height;
ret = SDL_GetWindowSizeInPixels(window, &window_width, &window_height);
assert(ret == 0);
if ((window_width != last_width) || (length > max_length)) {
max_length = max(min_length, length);
last_width = window_width;
int divisor = max(1, (max_length * 8 / 10));
int font_size = (window_width * 95 / 100) / divisor;
printf("fs %d %d %d\n", font_size, window_width, max_length);
load_font(renderer, font_size);
}
render(renderer, window_width, window_height, str_buf, length);
while (SDL_GetTicks() - ticks < (1000 / 60)) { SDL_Delay(1); }
SDL_RenderPresent(renderer);
ticks = SDL_GetTicks();
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_QUIT:
goto exit;
case SDL_EVENT_KEY_DOWN:
if (event.key.keysym.sym == SDLK_ESCAPE)
goto exit;
break;
default:
break;
}
}
}
exit:
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
}

16
timer.h
View File

@ -1,6 +1,7 @@
#pragma once
#include <time.h>
#include <stddef.h>
enum timer_status {
TIMER_STOPPED,
@ -15,12 +16,21 @@ struct stopwatch_time {
};
struct running_counter {
struct timespec start; // CLOCK_MONOTONIC (relative)
struct timespec offset; // CLOCK_MONOTONIC (relative)
struct timespec start; // (absolute)
struct timespec offset; // (relative)
};
struct timer_state {
enum timer_status status;
struct running_counter counter;
struct stopwatch_time time;
enum timer_status status;
int _pad;
};
static_assert((sizeof (struct running_counter)) == (8 * 2) * 2);
static_assert((sizeof (struct stopwatch_time)) == 4 * 4);
static_assert((sizeof (enum timer_status)) == 4);
static_assert((sizeof (struct timer_state)) == ((8 * 2) * 2) + (4 * 4) + 4 + 4);
static_assert((offsetof (struct timer_state, counter)) == 0);
static_assert((offsetof (struct timer_state, time )) == (8 * 2) * 2);
static_assert((offsetof (struct timer_state, status )) == ((8 * 2) * 2) + (4 * 4));