Can't call get_rand_64 under FreeRTOS (#2004)

earlephilhower · web-flow · commit 7e73e0b5b4e0 · 2024-02-13T12:08:33.000-08:00
Remove the HW random generator call while initting LWIP to avoid the SDK
looping forver due to FreeRTOS exception/timer interrupts.
diff --git a/cores/rp2040/lwip_wrap.cpp b/cores/rp2040/lwip_wrap.cpp
@@ -89,7 +89,7 @@ extern "C" {
     extern void __real_lwip_init();
     void __wrap_lwip_init() {
         if (!_lwip_rng) {
-            _lwip_rng = new XoshiroCpp::Xoshiro256PlusPlus(get_rand_64());
+            _lwip_rng = new XoshiroCpp::Xoshiro256PlusPlus(micros() * rp2040.getCycleCount());
             __real_lwip_init();
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -89,7 +89,7 @@ extern "C" {`
`89`	`89`	`extern void __real_lwip_init();`
`90`	`90`	`void __wrap_lwip_init() {`
`91`	`91`	`if (!_lwip_rng) {`
`92`		`- _lwip_rng = new XoshiroCpp::Xoshiro256PlusPlus(get_rand_64());`
	`92`	`+ _lwip_rng = new XoshiroCpp::Xoshiro256PlusPlus(micros() * rp2040.getCycleCount());`
`93`	`93`	`__real_lwip_init();`
`94`	`94`	`}`
`95`	`95`	`}`