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esp32-lilygo-t5/main/inkpot.c

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#include <stdio.h>
#include <string.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_heap_caps.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "esp_vfs.h"
#include "esp_littlefs.h"
#include <dirent.h>
#include "paper.h"
#include "server.h"
#define WIFI_SCAN_LIST_SIZE 10
#define LFS_PATH "/assets"
#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
// Scratch buffer size for sending files to HTTP clients
#define SCRATCH_BUFSIZE 2048
struct file_server_data {
/* Scratch buffer for temporary storage during file transfer */
char scratch[SCRATCH_BUFSIZE];
};
static const char *TAG = "inkpot";
// Function to log memory usage with the message at the end
void log_memory_usage(const char *message) {
ESP_LOGI(TAG, "Free heap: %d, Min free heap: %d, Largest free block: %d, %s",
heap_caps_get_free_size(MALLOC_CAP_DEFAULT),
heap_caps_get_minimum_free_size(MALLOC_CAP_DEFAULT),
heap_caps_get_largest_free_block(MALLOC_CAP_DEFAULT),
message);
}
// Initialize and mount the filesystem
void init_filesystem() {
ESP_LOGI(TAG, "Initializing File System");
esp_vfs_littlefs_conf_t conf = {
.base_path = LFS_PATH,
.partition_label = "assets",
.format_if_mount_failed = false,
.dont_mount = false,
};
esp_err_t err = esp_vfs_littlefs_register(&conf);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to mount or format filesystem");
} else {
ESP_LOGI(TAG, "Filesystem mounted at %s", LFS_PATH);
}
}
// Function to run a Lua script from file
void run_lua_file(const char *file_name, const char *test_name) {
ESP_LOGI(TAG, "Starting Lua test from file: %s", test_name);
log_memory_usage("Start of test");
lua_State *L = luaL_newstate();
if (L == NULL) {
ESP_LOGE(TAG, "Failed to create new Lua state");
return;
}
log_memory_usage("After luaL_newstate");
luaL_openlibs(L);
// Set the Lua module search path to include the assets directory
if (luaL_dostring(L, "package.path = package.path .. ';./?.lua;/assets/?.lua'")) {
ESP_LOGE(TAG, "Failed to set package.path: %s", lua_tostring(L, -1));
lua_pop(L, 1); // Remove error message from the stack
}
log_memory_usage("After luaL_openlibs");
// load `paper` library and expose it globally
luaL_requiref(L, "paper", luaopen_paper, 1);
lua_pop(L, 1);
log_memory_usage("After adding paper");
// Construct the full file path
char full_path[128];
snprintf(full_path, sizeof(full_path), LFS_PATH"/%s", file_name);
if (luaL_dofile(L, full_path) == LUA_OK) {
lua_pop(L, lua_gettop(L));
} else {
ESP_LOGE(TAG, "Error running Lua script from file '%s': %s", full_path, lua_tostring(L, -1));
lua_pop(L, 1); // Remove error message from the stack
}
log_memory_usage("After executing Lua script from file");
lua_close(L);
log_memory_usage("After lua_close");
ESP_LOGI(TAG, "End of Lua test from file: %s", test_name);
}
// Function to run an embedded Lua script
void run_lua_string(const char *lua_script, const char *script_name) {
ESP_LOGI(TAG, "Running lua script: %s", script_name);
ESP_LOGI(TAG, "%s", lua_script);
log_memory_usage("Start running script");
lua_State *L = luaL_newstate();
if (L == NULL) {
ESP_LOGE(TAG, "Failed to create new Lua state");
return;
}
log_memory_usage("After luaL_newstate");
luaL_openlibs(L);
log_memory_usage("After luaL_openlibs");
// load `paper` library and expose it globally
luaL_requiref(L, "paper", luaopen_paper, 1);
lua_pop(L, 1);
log_memory_usage("After adding paper");
if (luaL_dostring(L, lua_script) == LUA_OK) {
lua_pop(L, lua_gettop(L));
} else {
ESP_LOGE(TAG, "Error running embedded Lua script: %s", lua_tostring(L, -1));
lua_pop(L, 1); // Remove error message from the stack
}
log_memory_usage("After executing Lua script");
lua_close(L);
log_memory_usage("After lua_close");
ESP_LOGI(TAG, "End of Lua script: %s", script_name);
}
// Function to scan Wi-Fi networks
void scan_wifi_networks(void) {
ESP_LOGI(TAG, "Starting Wi-Fi scan...");
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_LOGW(TAG, "NVS Flash init error (%s), erasing...", esp_err_to_name(ret));
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_start());
wifi_scan_config_t scan_config = {
.ssid = NULL,
.bssid = NULL,
.channel = 0,
.show_hidden = true
};
ESP_ERROR_CHECK(esp_wifi_scan_start(&scan_config, true));
uint16_t ap_count = WIFI_SCAN_LIST_SIZE;
wifi_ap_record_t ap_info[WIFI_SCAN_LIST_SIZE];
ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&ap_count, ap_info));
ESP_LOGI(TAG, "Found %d access points:", ap_count);
for (int i = 0; i < ap_count; i++) {
ESP_LOGI(TAG, "SSID: %s, RSSI: %d", ap_info[i].ssid, ap_info[i].rssi);
}
ESP_ERROR_CHECK(esp_wifi_stop());
ESP_ERROR_CHECK(esp_wifi_deinit());
ESP_LOGI(TAG, "Wi-Fi scan completed.");
}
// HTTP Server
static esp_err_t http_index(httpd_req_t* req) {
char index_path[128];
strcpy(index_path, LFS_PATH);
strcat(index_path, "/http/index.html");
FILE *fd = fopen(index_path, "r");
char *chunk = ((struct file_server_data *)req->user_ctx)->scratch;
size_t chunksize;
do {
/* Read file in chunks into the scratch buffer */
chunksize = fread(chunk, 1, SCRATCH_BUFSIZE, fd);
if (chunksize > 0) {
/* Send the buffer contents as HTTP response chunk */
if (httpd_resp_send_chunk(req, chunk, chunksize) != ESP_OK) {
fclose(fd);
ESP_LOGE(TAG, "File sending failed!");
/* Abort sending file */
httpd_resp_sendstr_chunk(req, NULL);
/* Respond with 500 Internal Server Error */
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Failed to send file");
return ESP_FAIL;
}
}
/* Keep looping till the whole file is sent */
} while (chunksize != 0);
fclose(fd);
httpd_resp_set_hdr(req, "Connection", "close");
httpd_resp_send_chunk(req, NULL, 0);
ESP_LOGI(TAG, "Sent index.html");
return ESP_OK;
}
esp_err_t http_draw(httpd_req_t* req) {
// READING STREAM
int max_post_size = 4 * 1024;
char* buf = (char*)heap_caps_malloc(max_post_size, MALLOC_CAP_SPIRAM);
for (int i = 0; i < max_post_size; i++) {
buf[i] = 0;
}
if (buf == NULL) {
char msg[50];
sprintf(msg, "Failed to allocate %d chars\n", max_post_size);
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, msg);
return ESP_ERR_INVALID_ARG;
}
int ret, remaining = req->content_len;
while (remaining > 0) {
/* Read the data for the request */
if ((ret = httpd_req_recv(req, buf,
MIN(remaining, max_post_size))) <= 0) {
if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
/* Retry receiving if timeout occurred */
continue;
}
return ESP_FAIL;
}
remaining -= ret;
/* Log data received */
ESP_LOGI(TAG, "=========== RECEIVED DATA ==========");
ESP_LOGI(TAG, "%.*s", ret, buf);
ESP_LOGI(TAG, "====================================");
}
// Extract script from multipart-encoded POST body
// NOTE: This will break as soon as you send more than just the script. Be careful!
int first_lf = strcspn(buf, "\n") + 2; // get form boundary length
buf[strlen(buf) - first_lf - 2] = 0; // remove form boundary at end
memmove(buf, buf + first_lf, strlen(buf) - first_lf + 1);
// take only part after headers, which is designated by a dual linebreak
int header_end = strcspn(buf, "\n\n") + 3;
memmove(buf, buf + header_end, strlen(buf) - header_end + 1);
ESP_LOGI(TAG, "%s", buf);
// TODO: Error handling; we could probably even notify about syntax errors?
vTaskPrioritySet(NULL, tskIDLE_PRIORITY); // ensure that FreeRTOS task watchdog does not complain
run_lua_string(buf, "E-Paper Script via HTTP");
heap_caps_free(buf);
// Done reading
char response[100];
sprintf(response, "Thanks, I updated my screen!");
httpd_resp_set_type(req, "text/plain");
httpd_resp_set_status(req, "301");
httpd_resp_set_hdr(req, "Location", "/");
httpd_resp_send(req, response, HTTPD_RESP_USE_STRLEN);
return ESP_OK;
}
esp_err_t register_http_routes(httpd_handle_t server) {
static struct file_server_data *server_data = NULL;
if (server_data) {
ESP_LOGE(TAG, "File server already started");
return ESP_ERR_INVALID_STATE;
}
// Allocate memory for server data
server_data = calloc(1, sizeof(struct file_server_data));
if (!server_data) {
ESP_LOGE(TAG, "Failed to allocate memory for server data");
return ESP_ERR_NO_MEM;
}
{
httpd_uri_t uri
= { .uri = "/", .method = HTTP_GET, .handler = http_index, .user_ctx = server_data };
httpd_register_uri_handler(server, &uri);
}
{
httpd_uri_t uri
= { .uri = "/draw", .method = HTTP_POST, .handler = http_draw, .user_ctx = server_data };
httpd_register_uri_handler(server, &uri);
}
return ESP_OK;
}
// init
void app_main(void) {
// Initialize and mount the filesystem
init_filesystem();
// Initialize NVS, needed for wifi
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
httpd_handle_t server = get_server();
if (server != NULL) {
register_http_routes(server);
}
// Run script in assets/scripts/boot.lua; this is executed as a FreeRTOS task
// that may not be interrupted
void runLuaFile (void* arg) {
run_lua_file("scripts/boot.lua", "E-Paper Startup Script");
vTaskDelete(NULL);
}
xTaskCreate(runLuaFile, "run_lua_file", 4096, NULL, tskIDLE_PRIORITY, NULL);
ESP_LOGI(TAG, "End of application.");
// Prevent the task from ending
while (1) {
vTaskDelay(pdMS_TO_TICKS(1000));
}
}
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