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samd/moduos: Add uos.urandom() for SAMD51. 

Based on the hardware RNG.
This commit is contained in:
robert-hh 2022-06-05 21:08:37 +02:00 committed by Damien George
parent 15212ae8d4
commit 45bf25a002
2 changed files with 43 additions and 0 deletions
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3
ports/samd/boards/mpconfig_samd51.h
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@ -5,6 +5,9 @@
#define MICROPY_PY_BUILTINS_COMPLEX (0) #define MICROPY_PY_BUILTINS_COMPLEX (0)
#define MICROPY_PY_MATH (0) #define MICROPY_PY_MATH (0)
#define MICROPY_PY_CMATH (0) #define MICROPY_PY_CMATH (0)
#define MICROPY_PY_UOS_URANDOM (1)
#define MICROPY_PY_URANDOM_SEED_INIT_FUNC (trng_random_u32())
unsigned long trng_random_u32(void);
// Due to a limitation in the TC counter for us, the ticks period is 2**29 // Due to a limitation in the TC counter for us, the ticks period is 2**29
#define MICROPY_PY_UTIME_TICKS_PERIOD (0x20000000) #define MICROPY_PY_UTIME_TICKS_PERIOD (0x20000000)

40
ports/samd/moduos.c
View File

@ -34,6 +34,46 @@
#include "modmachine.h" #include "modmachine.h"
#include "sam.h" #include "sam.h"
#if defined(MCU_SAMD51)
static bool initialized = false;
STATIC void trng_start(void) {
if (!initialized) {
MCLK->APBCMASK.bit.TRNG_ = 1;
REG_TRNG_CTRLA = TRNG_CTRLA_ENABLE;
initialized = true;
}
}
uint32_t trng_random_u32(void) {
trng_start();
while ((REG_TRNG_INTFLAG & TRNG_INTFLAG_DATARDY) == 0) {
}
return REG_TRNG_DATA;
}
#if MICROPY_PY_UOS_URANDOM
STATIC mp_obj_t mp_uos_urandom(mp_obj_t num) {
mp_int_t n = mp_obj_get_int(num);
vstr_t vstr;
vstr_init_len(&vstr, n);
uint32_t rngval = 0;
trng_start();
for (int i = 0; i < n; i++) {
if ((i % 4) == 0) {
rngval = trng_random_u32();
}
vstr.buf[i] = rngval & 0xff;
rngval >>= 8;
}
return mp_obj_new_bytes_from_vstr(&vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_urandom_obj, mp_uos_urandom);
#endif // MICROPY_PY_UOS_URANDOM
#endif // defined(MCU_SAMD51)
#if MICROPY_PY_UOS_DUPTERM_BUILTIN_STREAM #if MICROPY_PY_UOS_DUPTERM_BUILTIN_STREAM
bool mp_uos_dupterm_is_builtin_stream(mp_const_obj_t stream) { bool mp_uos_dupterm_is_builtin_stream(mp_const_obj_t stream) {
const mp_obj_type_t *type = mp_obj_get_type(stream); const mp_obj_type_t *type = mp_obj_get_type(stream);