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#include <sys/param.h>
#include <math.h>
#include "esp_event.h"
#include "esp_log.h"
#include "esp_netif.h"
#include "esp_system.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "protocol_examples_common.h"
#include "driver/pwm.h"
#include <esp_http_server.h>
// channel configuration
#define GPIO_OUTPUT_CHANNEL_RED 0
#define GPIO_OUTPUT_CHANNEL_GREEN 0
#define GPIO_OUTPUT_CHANNEL_BLUE 2
// pwm frequency
#define PWM_PERIOD 1000
// raises the brigtness value from 0-1 to this power
#define BRIGHTNESS_CURVE_CORRECTION 3.f
// transition
#define TRANSITION_DURATION_MS 300
#define TRANSITION_STEP_LEN_MS 10
static const char *TAG = "rgbstrip";
int color[3];
static httpd_handle_t server = NULL;
const uint32_t pin_num[] = {GPIO_OUTPUT_CHANNEL_RED, GPIO_OUTPUT_CHANNEL_GREEN,
GPIO_OUTPUT_CHANNEL_BLUE};
uint32_t duties[] = {0, 0, 0};
float phase[] = {0, 0, 0};
int *transitionv;
int transitionc;
int transitioni;
void update_color(int r, int g, int b) {
for(int i = 0; i < transitionc; i++) {
float weight2 = (float)(i + 1) / transitionc;
float weight1 = 1 - weight2;
transitionv[i * 3 + 0] = (int)((float)color[0] * weight1 + (float)r * weight2);
transitionv[i * 3 + 1] = (int)((float)color[1] * weight1 + (float)g * weight2);
transitionv[i * 3 + 2] = (int)((float)color[2] * weight1 + (float)b * weight2);
}
transitioni = 0;
}
void update_strip() {
duties[0] = PWM_PERIOD - (int)( PWM_PERIOD * pow( (float)color[0] / 0xff, BRIGHTNESS_CURVE_CORRECTION ) );
duties[1] = PWM_PERIOD - (int)( PWM_PERIOD * pow( (float)color[1] / 0xff, BRIGHTNESS_CURVE_CORRECTION ) );
duties[2] = PWM_PERIOD - (int)( PWM_PERIOD * pow( (float)color[2] / 0xff, BRIGHTNESS_CURVE_CORRECTION ) );
pwm_set_duties(duties);
pwm_start();
}
char *color_to_str() {
char *value = (char *)malloc(sizeof(char) * (6 + 1)); // 6 char + 1 \0;
sprintf(value, "%02x%02x%02x", color[0], color[1], color[2]);
return value;
}
esp_err_t get_handler(httpd_req_t *req) {
const char *resp_str = color_to_str();
httpd_resp_send(req, resp_str, 6);
return ESP_OK;
}
httpd_uri_t get = {.uri = "/", .method = HTTP_GET, .handler = get_handler};
esp_err_t post_handler(httpd_req_t *req) {
char buf[6];
int remaining = req->content_len;
if (remaining != 6)
return ESP_OK;
httpd_req_recv(req, buf, 6);
char r_hex[] = {buf[0], buf[1], '\0'};
char g_hex[] = {buf[2], buf[3], '\0'};
char b_hex[] = {buf[4], buf[5], '\0'};
int r, g, b;
sscanf(r_hex, "%x", &r);
sscanf(g_hex, "%x", &g);
sscanf(b_hex, "%x", &b);
update_color(r, g, b);
httpd_resp_send_chunk(req, NULL, 0);
return ESP_OK;
}
httpd_uri_t post = {.uri = "/", .method = HTTP_POST, .handler = post_handler};
httpd_handle_t start_webserver(void) {
httpd_handle_t server = NULL;
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
if (httpd_start(&server, &config) == ESP_OK) {
ESP_LOGI(TAG, "Registering URI handlers");
httpd_register_uri_handler(server, &get);
httpd_register_uri_handler(server, &post);
return server;
}
ESP_LOGI(TAG, "Error starting server!");
return NULL;
}
void stop_webserver(httpd_handle_t server) { httpd_stop(server); }
static void disconnect_handler(void *arg, esp_event_base_t event_base, int32_t event_id,
void *event_data) {
httpd_handle_t *server = (httpd_handle_t *)arg;
if (*server) {
ESP_LOGI(TAG, "Stopping webserver");
stop_webserver(*server);
*server = NULL;
}
}
static void connect_handler(void *arg, esp_event_base_t event_base, int32_t event_id,
void *event_data) {
httpd_handle_t *server = (httpd_handle_t *)arg;
if (*server == NULL) {
ESP_LOGI(TAG, "Starting webserver");
*server = start_webserver();
}
}
void app_main() {
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
ESP_ERROR_CHECK(example_connect());
ESP_ERROR_CHECK(
esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &connect_handler, &server));
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED,
&disconnect_handler, &server));
pwm_init(PWM_PERIOD, duties, 3, pin_num);
pwm_set_phases(phase);
pwm_start();
transitionc = TRANSITION_DURATION_MS / TRANSITION_STEP_LEN_MS;
transitionv = (int*) malloc(sizeof(int) * transitionc * 3);
server = start_webserver();
update_color(0, 0, 0);
for (;;) {
color[0] = transitionv[transitioni * 3 + 0];
color[1] = transitionv[transitioni * 3 + 1];
color[2] = transitionv[transitioni * 3 + 2];
update_strip();
vTaskDelay(TRANSITION_STEP_LEN_MS / portTICK_RATE_MS);
transitioni = MIN(transitionc - 1, transitioni + 1);
}
}
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