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feat(rng): basic rng support on esp32h4

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gaoxu
2026-01-22 16:38:02 +08:00
parent fce70533fa
commit 8c74734591
3 changed files with 45 additions and 0 deletions
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40
components/bootloader_support/src/bootloader_random_esp32h4.c Normal file
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/*
* SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "sdkconfig.h"
#include "bootloader_random.h"
#include "soc/soc.h"
#include "soc/rng_reg.h"
#include "esp_rom_sys.h"
void bootloader_random_enable(void)
{
REG_SET_BIT(RNG_DATE_REG, RNG_CLK_EN);
REG_SET_BIT(RNG_CFG_REG, RNG_TIMER_EN);
REG_SET_FIELD(RNG_CFG_REG, RNG_RTC_TIMER_EN, 0x3);
REG_SET_BIT(RNG_CFG_REG, RNG_SAMPLE_ENABLE);
for (int i = 0; i < 10; i++) {
uint32_t random_sync = REG_READ(RNG_DATA_SYNC_REG);
uint32_t random_unsync = REG_READ(RNG_DATA_REG);
uint32_t rng_cfg = REG_READ(RNG_CFG_REG);
uint32_t sample_cnt = (rng_cfg >> RNG_SAMPLE_CNT_S) & 0xFF;
esp_rom_printf(" [%d] sync: 0x%08x, unsync: 0x%08x, sample_cnt: 0x%02x\r\n",
i + 1, random_sync, random_unsync, sample_cnt);
esp_rom_delay_us(1000);
}
}
void bootloader_random_disable(void)
{
REG_CLR_BIT(RNG_CFG_REG, RNG_SAMPLE_ENABLE);
REG_SET_FIELD(RNG_CFG_REG, RNG_RTC_TIMER_EN, 0x0);
REG_CLR_BIT(RNG_CFG_REG, RNG_TIMER_EN);
REG_CLR_BIT(RNG_DATE_REG, RNG_CLK_EN);
}