From 29a6cb62ecfa86ef47185bc49a471cfde1984ff5 Mon Sep 17 00:00:00 2001
From: VeyPatch <126267034+VeyPatch@users.noreply.github.com>
Date: Tue, 24 Dec 2024 22:04:21 +0100
Subject: [PATCH] Add more randomness

---
 .../hlc_tft_display/hlc_tft_display.c               | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/users/halcyon_modules/hlc_tft_display/hlc_tft_display.c b/users/halcyon_modules/hlc_tft_display/hlc_tft_display.c
index 6efd3d2d..11f56c9d 100644
--- a/users/halcyon_modules/hlc_tft_display/hlc_tft_display.c
+++ b/users/halcyon_modules/hlc_tft_display/hlc_tft_display.c
@@ -5,7 +5,7 @@
 #include "hlc_tft_display.h"
 
 #include "qp_surface.h"
-#include <time.h>
+#include "hardware/structs/rosc.h"
 
 // Fonts mono2
 #include "graphics/fonts/Retron2000-27.qff.h"
@@ -54,6 +54,15 @@ bool grid[GRID_HEIGHT][GRID_WIDTH];  // Current state
 bool new_grid[GRID_HEIGHT][GRID_WIDTH];  // Next state
 bool changed_grid[GRID_HEIGHT][GRID_WIDTH]; // Tracks changed cells
 
+uint32_t get_random_32bit(void) {
+    uint32_t random_value = 0;
+    for (int i = 0; i < 32; i++) {
+        wait_ms(1);
+        random_value = (random_value << 1) | (rosc_hw->randombit & 1);
+    }
+    return random_value;
+}
+
 void init_grid() {
     // Initialize grid with alive cells
     for (int y = 0; y < GRID_HEIGHT; y++) {
@@ -284,7 +293,7 @@ bool display_module_housekeeping_task_kb(bool second_display) {
         static uint32_t previous_matrix_activity_time = 0;
 
         if(!second_display_set) {
-            srand(time(NULL));
+            srand(get_random_32bit());
             init_grid();
             color_value = rand() % 8;
             second_display_set = true;