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added gradient calculation and fnordlicht interface

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This commit is contained in:
Steffen Vogel 2011-02-02 19:18:35 +01:00
parent aa0346cdb5
commit 6a76044f05
1 changed files with 66 additions and 12 deletions
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78
src/fnpom.c
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@ -2,6 +2,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <json/json.h>
#include <sys/types.h>
#include <sys/socket.h>
@ -24,6 +25,16 @@ char * http_get_body(char * response) {
return NULL;
}
struct rgb_color_t calc_gradient(double quota, struct rgb_color_t start, struct rgb_color_t end) {
struct rgb_color_t gradient = start;
gradient.red = (end.red - start.red) * quota;
gradient.green = (end.green - start.green) * quota;
gradient.blue = (end.blue - start.blue) * quota;
return gradient;
}
char * http_get(char * response, size_t bytes, char * host, char * port, char * path) {
int sd, count;
char request[1024];
@ -58,39 +69,82 @@ char * http_get(char * response, size_t bytes, char * host, char * port, char *
int main(int argc, char * argv[]) {
char host[] = "volkszaehler.org";
char port[] = "80";
char path[] = "/demo/backend.php/data/";
char path[] = "/demo/backend.php/data";
char uuid[] = "12345678-1234-1234-1234-123456789012";
char device[] = "/dev/ttyUSB0";
char response[8192], url[1024], * json;
int debug = 1, fd;
struct json_tokener * json_tok;
struct json_object * json_obj;
struct termios oldtio;
struct rgb_color_t start = {0, 0xff, 0};
struct rgb_color_t end = {0xff, 0, 0};
/* build url path */
sprintf(url, "%s/%s.json?from=last%%20year&tuples=1", path, uuid); /* store request uri in buffer */
sprintf(url, "%s/%s.txt?from=yesterday&tuples=1", path, uuid); /* store request uri in buffer */
if (debug) printf("url: http://%s:%s%s\n", host, port, url);
/* get json */
http_get(response, sizeof(response), host, port, url); /* fetch json data to buffer */
json = http_get_body(response); /* get pointer to http body */
/* parse json */
json_tok = json_tokener_new();
json_obj = json_tokener_parse_ex(json_tok, json, strlen(json));
if (json_tok->err != json_tokener_success) {
json_obj = error_ptr(-json_tok->err);
fprintf(stderr, "failed to parse json: %s\n", json_tokener_errors[json_tok->err]);
exit(-1);
}
/* printf("%s\n", json_object_to_json_string(json_obj)); */
if (debug) printf("%s\n", json_object_to_json_string(json_obj));
json_obj = json_object_object_get(json_obj, "data");
json_obj = json_object_object_get(json_obj, "last");
if (json_object_get_type(json_obj) != json_type_double) {
fprintf(stderr, "invalid json!\n");
exit(-1);
double last = json_object_get_double(json_object_object_get(json_obj, "last"));
double max = json_object_get_double(json_object_object_get(json_object_object_get(json_obj, "max"), "value"));
double min = json_object_get_double(json_object_object_get(json_object_object_get(json_obj, "min"), "value"));
/* calc quota and color for lighting */
double quota = (last - min) / (max - min);
if (debug) {
printf("Last value: %.2f\n", last);
printf("Min value: %.2f\n", min);
printf("Max value: %.2f\n", max);
printf("Quota: %d%%\n", (int) (quota*100));
}
printf("Last value: %.2f\n", json_object_get_double(json_obj));
struct rgb_color_t gradient = calc_gradient(quota, start, end);
if (debug) printf("resulting color: #%0X%0X%0X\n", gradient.red, gradient.green, gradient.blue);
/* fade fnordlichts */
if (debug) printf("connect via rs232: %s\n", device);
fd = open(device, O_RDWR | O_NOCTTY);
if (fd < 0) {
perror(port);
exit(-1);
}
oldtio = fn_init(fd);
fn_sync(fd);
struct remote_msg_fade_rgb_t fn_cmd;
fn_cmd.step = 255;
fn_cmd.delay = 0;
fn_cmd.color = gradient;
fn_cmd.address = 255;
fn_cmd.cmd = REMOTE_CMD_FADE_RGB;
fn_send(fd, &fn_cmd);
/* housekeeping */
json_tokener_free(json_tok);
json_tokener_free(json_tok); /* free json objects */
tcsetattr(fd, TCSANOW, &oldtio); /* reset serial port */
return 0;
}