stm32: add more MCUs with h/w RNG

lib/stm32-svd

@@ -1 +1 @@
-Subproject commit 5f417214efe79598eadd38f68b4432384ca57456
+Subproject commit e6db8e32d5d42293a528434ec12e7f88479a8649

src/crypto/rand/rand_baremetal.go

@@ -1,5 +1,5 @@
-//go:build stm32wlx || stm32f4 || stm32f7 || stm32l4 || (sam && atsamd51) || (sam && atsame5x)
-// +build stm32wlx stm32f4 stm32f7 stm32l4 sam,atsamd51 sam,atsame5x
+//go:build stm32 || (sam && atsamd51) || (sam && atsame5x)
+// +build stm32 sam,atsamd51 sam,atsame5x
 
 package rand
 

src/machine/machine_stm32_rng.go

@@ -1,5 +1,5 @@
-//go:build stm32f4 || stm32f7 || stm32l4 || stm32wlx
-// +build stm32f4 stm32f7 stm32l4 stm32wlx
+//go:build stm32 && !(stm32f103 || stm32l0x1)
+// +build stm32,!stm32f103,!stm32l0x1
 
 package machine
 

src/machine/machine_stm32l0x2.go

@@ -1,3 +1,4 @@
+//go:build stm32l0x2
 // +build stm32l0x2
 
 package machine
@@ -252,3 +253,8 @@ const (
 	ARR_MAX = 0x10000
 	PSC_MAX = 0x10000
 )
+
+func initRNG() {
+	stm32.RCC.AHBENR.SetBits(stm32.RCC_AHBENR_RNGEN)
+	stm32.RNG.CR.SetBits(stm32.RNG_CR_RNGEN)
+}

src/machine/machine_stm32l5.go

@@ -1,3 +1,4 @@
+//go:build stm32l5
 // +build stm32l5
 
 package machine
@@ -546,3 +547,12 @@ const (
 	ARR_MAX = 0x10000
 	PSC_MAX = 0x10000
 )
+
+func initRNG() {
+	stm32.RCC.CRRCR.SetBits(stm32.RCC_CRRCR_HSI48ON)
+	for !stm32.RCC.CRRCR.HasBits(stm32.RCC_CRRCR_HSI48RDY) {
+	}
+
+	stm32.RCC.AHB2ENR.SetBits(stm32.RCC_AHB2ENR_RNGEN)
+	stm32.RNG.CR.SetBits(stm32.RNG_CR_RNGEN)
+}