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Add TRNG

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This commit is contained in:
Sergio R. Caprile 2023-10-09 13:03:52 -03:00
parent 7d07ca8427
commit 0965177e72
1 changed files with 16 additions and 3 deletions
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19
examples/nxp/rt1020-evk-make-baremetal-builtin/hal.h
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@ -196,12 +196,25 @@ static inline uint8_t uart_read_byte(LPUART_Type *uart) {
return (uint8_t) (uart->DATA & 255);
}
// TODO(NXP): get RNG usage specs
static inline void rng_init(void) {
clock_periph(6, CCM_CCGR6_CG6_SHIFT, CLOCK_ON_RUN_WAIT); // trng_clk
SETBITS(TRNG->MCTL,
TRNG_MCTL_PRGM_MASK | TRNG_MCTL_ERR_MASK | TRNG_MCTL_RST_DEF_MASK,
TRNG_MCTL_PRGM(1) | TRNG_MCTL_ERR(1) |
TRNG_MCTL_RST_DEF(1)); // reset to default values
SETBITS(TRNG->MCTL, TRNG_MCTL_PRGM_MASK | TRNG_MCTL_ERR_MASK,
TRNG_MCTL_PRGM(0)); // set to run mode
(void) TRNG->ENT[TRNG_ENT_COUNT - 1]; // start new entropy generation
(void) TRNG->ENT[0]; // defect workaround
}
#include <stdlib.h>
static inline uint32_t rng_read(void) {
return (uint32_t) rand();
static uint8_t idx = 0;
while ((TRNG->MCTL & TRNG_MCTL_ENT_VAL_MASK) == 0) (void) 0;
uint32_t data = TRNG->ENT[idx++]; // read data
idx %= TRNG_ENT_COUNT; // stay within array limits
if (idx == 0) // we've just read TRNG_ENT_COUNT - 1
(void) TRNG->ENT[0]; // defect workaround
return data;
}
// - PHY has no xtal, XI driven from ENET_REF_CLK1 (labeled as ENET_TX_CLK