Commit 496ffbd

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Merge pull request #895 from pennam/trng

Enable (t)rng support for STM32H7 and NANO RP2040

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Original file line number	Diff line number	Diff line change
`@@ -23,10 +23,36 @@`
`23`	`23`
`24`	`24`	`extern "C" {`
`25`	`25`	`#include "stdlib.h"`
	`26`	`+ #include "hal/trng_api.h"`
`26`	`27`	`}`
	`28`	`+#if defined(ARDUINO_NANO_RP2040_CONNECT) \|\| \`
	`29`	`+ defined(ARDUINO_PORTENTA_H7_M7) \|\| \`
	`30`	`+ defined(ARDUINO_NICLA_VISION) \|\| \`
	`31`	`+ defined(ARDUINO_OPTA) \|\| \`
	`32`	`+ defined(ARDUINO_GIGA)`
	`33`	`+#define MBED_TRNG_SUPPORT 1`
	`34`	`+static long trng()`
	`35`	`+{`
	`36`	`+ trng_t trng_obj;`
	`37`	`+ trng_init(&trng_obj);`
	`38`	`+ long value;`
	`39`	`+ size_t olen;`
	`40`	`+ if (trng_get_bytes(&trng_obj, (uint8_t*)&value, sizeof(value), &olen) != 0)`
	`41`	`+ return -1;`
	`42`	`+ trng_free(&trng_obj);`
	`43`	`+ return value >= 0 ? value : -value;`
	`44`	`+}`
	`45`	`+#endif`
	`46`	`+`
	`47`	`+#if (MBED_TRNG_SUPPORT == 1)`
	`48`	`+static bool useTRNG = true;`
	`49`	`+#endif`
`27`	`50`
`28`	`51`	`void randomSeed(unsigned long seed)`
`29`	`52`	`{`
	`53`	`+#if (MBED_TRNG_SUPPORT == 1)`
	`54`	`+ useTRNG = false;`
	`55`	`+#endif`
`30`	`56`	`if (seed != 0) {`
`31`	`57`	`srandom(seed);`
`32`	`58`	`}`
`@@ -37,6 +63,11 @@ long random(long howbig)`
`37`	`63`	`if (howbig == 0) {`
`38`	`64`	`return 0;`
`39`	`65`	`}`
	`66`	`+#if (MBED_TRNG_SUPPORT == 1)`
	`67`	`+ if (useTRNG == true) {`
	`68`	`+ return trng() % howbig;`
	`69`	`+ }`
	`70`	`+#endif`
`40`	`71`	`return random() % howbig;`
`41`	`72`	`}`
`42`	`73`
`@@ -48,3 +79,5 @@ long random(long howsmall, long howbig)`
`48`	`79`	`long diff = howbig - howsmall;`
`49`	`80`	`return random(diff) + howsmall;`
`50`	`81`	`}`
	`82`	`+`
	`83`	`+#undef MBED_TRNG_SUPPORT`

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