From 60717b074e6e8dba28e1fb60237926f8f0f78b85 Mon Sep 17 00:00:00 2001
From: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Date: Tue, 25 Oct 2022 17:59:10 +1300
Subject: [PATCH] Implement different random for rp2040 (#3939)

---
 esphome/core/helpers.cpp | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 79e706cf0d..48ef406a81 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -23,6 +23,7 @@
 #include <freertos/portmacro.h>
 #elif defined(USE_RP2040) && defined(USE_WIFI)
 #include <WiFi.h>
+#include <hardware/structs/rosc.h>
 #endif
 
 #ifdef USE_ESP32_IGNORE_EFUSE_MAC_CRC
@@ -94,7 +95,12 @@ uint32_t random_uint32() {
 #elif defined(USE_ESP8266)
   return os_random();
 #elif defined(USE_RP2040)
-  return ((uint32_t) rand()) << 16 + ((uint32_t) rand());
+  uint32_t result = 0;
+  for (uint8_t i = 0; i < 32; i++) {
+    result <<= 1;
+    result |= rosc_hw->randombit;
+  }
+  return result;
 #else
 #error "No random source available for this configuration."
 #endif
@@ -107,7 +113,15 @@ bool random_bytes(uint8_t *data, size_t len) {
 #elif defined(USE_ESP8266)
   return os_get_random(data, len) == 0;
 #elif defined(USE_RP2040)
-  return false;
+  while (len-- != 0) {
+    uint8_t result = 0;
+    for (uint8_t i = 0; i < 8; i++) {
+      result <<= 1;
+      result |= rosc_hw->randombit;
+    }
+    *data++ = result;
+  }
+  return true;
 #else
 #error "No random source available for this configuration."
 #endif