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Added ESP32 OTP support.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos 2024-09-16 00:50:50 +02:00
parent cafb6a4774
commit 739e9f1b98
No known key found for this signature in database
GPG key ID: C0095B7870A4CCD3
2 changed files with 54 additions and 5 deletions
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53
src/fs/otp.c
View file

@ -50,11 +50,11 @@ static int otp_write_data_mode(uint16_t row, uint8_t *data, uint16_t len, bool i
static int otp_write_data(uint16_t row, uint8_t *data, uint16_t len) {
return otp_write_data_mode(row, data, len, true);
}
/*
static int otp_write_data_raw(uint16_t row, uint8_t *data, uint16_t len) {
return otp_write_data_mode(row, data, len, false);
}
*/
static uint8_t* otp_buffer(uint16_t row) {
volatile uint32_t *p = ((uint32_t *)(OTP_DATA_GUARDED_BASE + (row*2)));
return (uint8_t *)p;
@ -72,18 +72,33 @@ static bool is_otp_locked_page(uint8_t page) {
static void otp_lock_page(uint8_t page) {
if (!is_otp_locked_page(page)) {
uint32_t value = 0x3c3c3c;
printf("Locking page %d, with row %d and value %lx\n", page, OTP_DATA_PAGE0_LOCK0_ROW + page*2 + 1, value);
//otp_write_data_raw(OTP_DATA_PAGE0_LOCK0_ROW + page*2 + 1, (uint8_t *)&value, sizeof(value));
otp_write_data_raw(OTP_DATA_PAGE0_LOCK0_ROW + page*2 + 1, (uint8_t *)&value, sizeof(value));
}
otp_hw->sw_lock[page] = 0b1100;
}
#endif
#ifdef ESP_PLATFORM
uint8_t _otp_key_1[32] = {0};
esp_err_t read_key_from_efuse(esp_efuse_block_t block, uint8_t *key, size_t key_len) {
const esp_efuse_desc_t **key_desc = esp_efuse_get_key(block);
if (!key_desc) {
return ESP_FAIL;
}
return esp_efuse_read_field_blob(key_desc, key, key_len * 8);
}
#endif
const uint8_t *otp_key_1 = NULL;
void init_otp_files() {
#ifdef PICO_RP2350
#ifdef PICO_RP2350
uint8_t page = OTP_KEY_1 >> 6;
if (is_empty_otp_buffer(OTP_KEY_1, 32)) {
uint8_t mkek[32] = {0};
@ -96,5 +111,33 @@ void init_otp_files() {
otp_key_1 = otp_buffer(OTP_KEY_1);
otp_lock_page(page);
#elif defined(ESP_PLATFORM)
if (esp_efuse_key_block_unused(OTP_KEY_1)) {
uint8_t mkek[32] = {0};
random_gen(NULL, mkek, sizeof(mkek));
DEBUG_DATA(mkek, 32);
esp_err_t ret = esp_efuse_write_key(OTP_KEY_1, ESP_EFUSE_KEY_PURPOSE_USER, mkek, sizeof(mkek));
if (ret != ESP_OK) {
printf("Error writing OTP key 1 [%d]\n", ret);
}
ret = esp_efuse_set_key_dis_write(OTP_KEY_1);
if (ret != ESP_OK) {
printf("Error setting OTP key 1 to read only [%d]\n", ret);
}
ret = esp_efuse_set_keypurpose_dis_write(OTP_KEY_1);
if (ret != ESP_OK) {
printf("Error setting OTP key 1 purpose to read only [%d]\n", ret);
}
}
esp_err_t ret = read_key_from_efuse(OTP_KEY_1, _otp_key_1, sizeof(_otp_key_1));
if (ret != ESP_OK) {
printf("Error reading OTP key 1 [%d]\n", ret);
}
else {
DEBUG_DATA(_otp_key_1, 32);
}
otp_key_1 = _otp_key_1;
#endif
}

6
src/fs/otp.h
View file

@ -25,6 +25,12 @@
#define OTP_KEY_1 OTP_TEST_ROW
#elif defined(ESP_PLATFORM)
#include "esp_efuse.h"
#define OTP_KEY_1 EFUSE_BLK_KEY3
#endif
extern const uint8_t *otp_key_1;