Naming and coding style convention, new linter tool. (#945)

* Makefile, Scripts: new linter
* About: remove ID from IC
* Firmware: remove double define for DIVC/DIVR
* Scripts: check folder names too. Docker: replace syntax check with make lint.
* Reformat Sources and Migrate to new file naming convention
* Docker: symlink clang-format-12 to clang-format
* Add coding style guide

firmware/targets/f6/furi_hal/furi_hal_random.c

@@ -0,0 +1,58 @@
+#include "furi_hal_random.h"
+#include <furi.h>
+#include <furi_hal.h>
+
+#include <stm32wbxx_ll_rng.h>
+#include <stm32wbxx_ll_hsem.h>
+
+#include <hw_conf.h>
+
+uint32_t furi_hal_random_get() {
+    while(LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID))
+        ;
+    LL_RNG_Enable(RNG);
+
+    while(!LL_RNG_IsActiveFlag_DRDY(RNG))
+        ;
+
+    if((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
+        furi_crash("TRNG error");
+    }
+
+    uint32_t random_val = LL_RNG_ReadRandData32(RNG);
+
+    LL_RNG_Disable(RNG);
+    LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
+
+    return random_val;
+}
+
+void furi_hal_random_fill_buf(uint8_t* buf, uint32_t len) {
+    while(LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID))
+        ;
+    LL_RNG_Enable(RNG);
+
+    for(uint32_t i = 0; i < len; i += 4) {
+        while(!LL_RNG_IsActiveFlag_DRDY(RNG))
+            ;
+
+        if((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
+            furi_crash("TRNG error");
+        }
+
+        uint32_t random_val = LL_RNG_ReadRandData32(RNG);
+
+        uint8_t len_cur = ((i + 4) < len) ? (4) : (len - i);
+        memcpy(&buf[i], &random_val, len_cur);
+    }
+
+    LL_RNG_Disable(RNG);
+    LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
+}
+
+void srand(unsigned seed) {
+}
+
+int rand() {
+    return (furi_hal_random_get() & RAND_MAX);
+}