diff --git a/En_words b/stringHash4MCU_/En_words
similarity index 100%
rename from En_words
rename to stringHash4MCU_/En_words
diff --git a/stringHash4MCU_/Readme b/stringHash4MCU_/Readme
new file mode 100644
index 0000000..4e7cf15
--- /dev/null
+++ b/stringHash4MCU_/Readme
@@ -0,0 +1,6 @@
+hashtest.c allows to test different hash functions on your dictionary
+hashgen.c will generate two files by dictionary: source and header
+use test.c to test generated files
+
+Compile: gcc -lusefull_macro file.c -o file
+gcc -lusefull_macro test.c hash.c -o test
diff --git a/stringHash4MCU_/hashgen.c b/stringHash4MCU_/hashgen.c
new file mode 100644
index 0000000..c4f2a7f
--- /dev/null
+++ b/stringHash4MCU_/hashgen.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <usefull_macros.h>
+#include <ctype.h>
+
+#define ALLOCSZ     (5000)
+#define DJB2
+
+typedef struct{
+    char *dict;
+    char *headerfile;
+    char *sourcefile;
+    int genfunc;
+} glob_pars;
+
+static glob_pars G = {.headerfile = "hash.h", .sourcefile = "hash.c"};
+static int help = 0;
+static myoption cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&help),        "show this help"},
+    {"dict",    NEED_ARG,   NULL,   'd',    arg_string, APTR(&G.dict),      "dictionary file"},
+    {"header",  NEED_ARG,   NULL,   'H',    arg_string, APTR(&G.headerfile),"output header filename"},
+    {"source",  NEED_ARG,   NULL,   'S',    arg_string, APTR(&G.sourcefile),"output source filename"},
+    {"genfunc", NO_ARGS,    NULL,   'F',    arg_int,    APTR(&G.genfunc),   "generate function bodys"},
+    end_option
+};
+static void parse_args(int argc, char **argv){
+    parseargs(&argc, &argv, cmdlnopts);
+    if(help) showhelp(-1, cmdlnopts);
+    if(argc > 0){
+        red("Unused arguments:\n");
+        for(int i = 0; i < argc; ++i)
+            printf("%s ", argv[i]);
+        printf("\n");
+        showhelp(-1, cmdlnopts);
+    }
+}
+
+#define HASHFNO (3)
+// djb2 & sdbm: http://www.cse.yorku.ca/~oz/hash.html
+static uint32_t djb2(const char *str){
+    uint32_t hash = 5381;
+    uint32_t c;
+    while((c = (uint32_t)*str++))
+        hash = ((hash << 7) + hash) + c;
+        //hash = hash * 31 + c;
+        //hash = hash * 33 + c;
+    return hash;
+}
+static uint32_t sdbm(const char *str){
+    uint32_t hash = 5381;
+    uint32_t c;
+    while((c = (uint32_t)*str++))
+        hash = c + (hash << 6) + (hash << 16) - hash;
+    return hash;
+}
+// jenkins: https://en.wikipedia.org/wiki/Jenkins_hash_function
+static uint32_t jenkins(const char *str){
+    uint32_t hash = 0, c;
+    while((c = (uint32_t)*str++)){
+        hash += c;
+        hash += (hash << 10);
+        hash ^= (hash >> 6);
+    }
+    hash += (hash << 3);
+    hash ^= (hash >> 11);
+    hash += (hash << 15);
+    return hash;
+}
+
+static const char *hashsources[HASHFNO] = {
+"static uint32_t hashf(const char *str){\n\
+    uint32_t hash = 5381;\n\
+    uint32_t c;\n\
+    while((c = (uint32_t)*str++))\n\
+        hash = ((hash << 7) + hash) + c;\n\
+    return hash;\n\
+}\n",
+"static uint32_t hashf(const char *str){\n\
+    uint32_t hash = 5381;\n\
+    uint32_t c;\n\
+    while((c = (uint32_t)*str++))\n\
+        hash = c + (hash << 6) + (hash << 16) - hash;\n\
+    return hash;\n\
+}\n",
+"static uint32_t hashf(const char *str){\n\
+    uint32_t hash = 0, c;\n\
+    while((c = (uint32_t)*str++)){\n\
+        hash += c;\n\
+        hash += (hash << 10);\n\
+        hash ^= (hash >> 6);\n\
+    }\n\
+    hash += (hash << 3);\n\
+    hash ^= (hash >> 11);\n\
+    hash += (hash << 15);\n\
+    return hash;\n\
+}\n"
+};
+
+static uint32_t (*hash[HASHFNO])(const char *str) = {djb2, sdbm, jenkins};
+static const char *hashnames[HASHFNO] = {"DJB2", "SDBM", "Jenkins"};
+
+typedef struct{
+    char str[32];
+    uint32_t hash;
+} strhash;
+
+static int sorthashesH(const void *a, const void *b){
+    register uint32_t h1 = ((strhash*)a)->hash, h2 = ((strhash*)b)->hash;
+    if(h1 > h2) return 1;
+    else if(h1 < h2) return -1;
+    return 0;
+}
+static int sorthashesS(const void *a, const void *b){
+    char *s1 = ((strhash*)a)->str, *s2 = ((strhash*)b)->str;
+    return strcmp(s1, s2);
+}
+
+static FILE *openoutp(const char *name){
+    FILE *f = fopen(name, "w");
+    if(!f) ERR("Can't open file %s", name);
+    return f;
+}
+
+static char *macroname(const char *cmd){
+    static char macro[32];
+    int i = 0;
+    while(i < 31 && *cmd){
+        char c = *cmd++;
+        if(!isalnum(c)) c = '_';
+        if(islower(c)) c = toupper(c);
+        macro[i++] = c;
+    }
+    macro[i] = 0;
+    return macro;
+}
+
+static char *fnname(const char *cmd){
+    static char fn[32];
+    int i = 0;
+    while(i < 31 && *cmd){
+        char c = *cmd++;
+        if(!isalpha(c)) c = '_';
+        if(isupper(c)) c = tolower(c);
+        fn[i++] = c;
+    }
+    fn[i] = 0;
+    return fn;
+}
+
+static const char *fhdr =
+"int parsecmd(char *cmdwargs){\n\
+    if(!cmdwargs || !*cmdwargs) return 0;\n\
+    char cmd[32];\n\
+    int i = 0;\n\
+    char *args = cmdwargs;\n\
+    while(*args && *args < 33) ++args;\n\
+    if(!args || !*args) return 0;\n\
+    while(*args > 33 && i < 31){\n\
+        cmd[i++] = *args++;\n\
+    }\n\
+    cmd[i] = 0;\n\
+    if(i == 31) args = NULL;\n\
+    if(args){\n\
+        while(*args && *args < 33) ++args;\n\
+        if(!*args) args = NULL;\n\
+    }\n\
+    uint32_t h = hashf(cmd);\n\
+    switch(h){\n"
+;
+static const char *ffooter =
+"        default: return 0;\n\
+    }\n\
+    return 0;\n\
+}\n\n"
+;
+static const char *fns =
+"TRUE_INLINE int fn_%s(_U_ uint32_t hash,  _U_ char *args){ // %s (%u)\n\
+    return 1;\n\
+}\n\n"
+;
+static const char *fproto = "int parsecmd(char *cmdwargs);\n\n";
+static const char *sw =
+"        case CMD_%s:\n\
+            return fn_%s(h, args);\n\
+        break;\n";
+static const char *srchdr =
+"#include <stdint.h>\n\
+#include <stddef.h>\n\
+#include \"%s\"\n\n\
+#ifndef _U_\n\
+#define _U_ __attribute__((__unused__))\n\
+#endif\n\n\
+#ifndef TRUE_INLINE\n\
+#define TRUE_INLINE  __attribute__((always_inline)) static inline\n\
+#endif\n\n"
+;
+
+static void build(strhash *H, int hno, int hlen){
+    green("Generate files for hash function '%s'\n", hashnames[hno]);
+    int lmax = 1;
+    for(int i = 0; i < hlen; ++i){
+        int l = strlen(H[i].str);
+        if(l > lmax){
+            lmax = l;
+        }
+    }
+    lmax = (lmax + 3)/4;
+    lmax *= 4;
+    // resort H by strings
+    qsort(H, hlen, sizeof(strhash), sorthashesS);
+    FILE *source = openoutp(G.sourcefile), *header = openoutp(G.headerfile);
+    fprintf(source, srchdr, G.headerfile);
+    if(G.genfunc){
+        for(int i = 0; i < hlen; ++i){
+            //fprintf(source, fns, "popo", "lolo", 12);
+            fprintf(source, fns, fnname(H[i].str), H[i].str, H[i].hash);
+        }
+    }
+    fprintf(header, "%s", fproto);
+    fprintf(source, "%s\n", hashsources[hno]);
+    fprintf(source, "%s", fhdr);
+    for(int i = 0; i < hlen; ++i){
+        char *m = macroname(H[i].str);
+        fprintf(source, sw, m, fnname(H[i].str));
+        fprintf(header, "#define CMD_%-*s    (%u)\n", lmax, m, H[i].hash);
+    }
+    fprintf(source, "%s", ffooter);
+    fclose(source);
+    fclose(header);
+}
+
+int main(int argc, char **argv){
+    initial_setup();
+    parse_args(argc, argv);
+    if(!G.dict) ERRX("point dictionary file");
+    if(!G.headerfile) ERRX("point header source file");
+    if(!G.sourcefile) ERRX("point c source file");
+    mmapbuf *b = My_mmap(G.dict);
+    if(!b) ERRX("Can't open %s", G.dict);
+    char *word = b->data;
+    strhash *H = MALLOC(strhash, ALLOCSZ);
+    int l = ALLOCSZ, idx = 0;
+    while(*word){
+        if(idx >= l){
+            l += ALLOCSZ;
+            H = realloc(H, sizeof(strhash) * l);
+            if(!H) ERR("realloc()");
+        }
+        while(*word && *word < 33) ++word;
+        if(!*word) break;
+        char *nxt = strchr(word, '\n');
+        if(nxt){
+            int len = nxt - word;
+            if(len > 31) len = 31;
+            strncpy(H[idx].str, word, len);
+            H[idx].str[len] = 0;
+        }else{
+            snprintf(H[idx].str, 31, "%s", word);
+        }
+        ++idx;
+        if(!nxt) break;
+        word = nxt + 1;
+    }
+    int imax1 = idx - 1, hno = 0;
+    for(; hno < HASHFNO; ++hno){
+        for(int i = 0; i < idx; ++i)
+            H[i].hash = hash[hno](H[i].str);
+        qsort(H, idx, sizeof(strhash), sorthashesH);
+        strhash *p = H;
+        int nmatches = 0;
+        for(int i = 0; i < imax1; ++i, ++p){
+            if(p->hash == p[1].hash) ++nmatches;
+        }
+        if(nmatches == 0){
+            build(H, hno, idx);
+            break;
+        }
+        WARNX("Function '%s' have %d matches", hashnames[hno], nmatches);
+    }
+    if(hno == HASHFNO) WARNX("Can't find proper hash function");
+    FREE(H);
+    My_munmap(b);
+    return 0;
+}
diff --git a/hashtest.c b/stringHash4MCU_/hashtest.c
similarity index 100%
rename from hashtest.c
rename to stringHash4MCU_/hashtest.c
diff --git a/stringHash4MCU_/test.c b/stringHash4MCU_/test.c
new file mode 100644
index 0000000..f50870b
--- /dev/null
+++ b/stringHash4MCU_/test.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "hash.h"
+
+/*
+static int f(uint32_t h, const char *args){
+    printf("%u -> '%s'\n", h, args);
+    return 1;
+}*/
+
+int main(int argc, char **argv){
+    if(argc != 2) return 1;
+    if(!parsecmd(argv[1])) printf("%s not found\n", argv[1]);
+    else printf("All OK\n");
+    return 0;
+}
diff --git a/stringHash4MCU_/testdic b/stringHash4MCU_/testdic
new file mode 100644
index 0000000..20f8994
--- /dev/null
+++ b/stringHash4MCU_/testdic
@@ -0,0 +1,11 @@
+hello
+world
+what
+put
+change
+set
+clear
+reset
+get
+out
+in