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efuse: When Virtual eFuses are enabled, seed the virtual values as part of startup code

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Angus Gratton 2019-03-11 15:15:16 +11:00 committed by Angus Gratton
parent f42ae05d1e
commit af1ea9b1b9
2 changed files with 14 additions and 4 deletions
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8
components/efuse/src/esp_efuse_utility.c
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@ -32,6 +32,10 @@ static const char *TAG = "efuse";
// Array for emulate efuse registers.
#ifdef CONFIG_EFUSE_VIRTUAL
static uint32_t virt_blocks[COUNT_EFUSE_BLOCKS][COUNT_EFUSE_REG_PER_BLOCK];
/* Call the update function to seed virtual efuses during initialization */
__attribute__((constructor)) void esp_efuse_utility_update_virt_blocks();
#endif
/**
@ -181,7 +185,7 @@ void esp_efuse_utility_reset(void)
void esp_efuse_utility_burn_efuses(void)
{
#ifdef CONFIG_EFUSE_VIRTUAL
ESP_LOGE(TAG, "Not really burning any efuses!");
ESP_LOGW(TAG, "Virtual efuses enabled: Not really burning eFuses");
for (int num_block = 0; num_block < COUNT_EFUSE_BLOCKS; num_block++) {
esp_efuse_coding_scheme_t scheme = esp_efuse_get_coding_scheme(num_block);
if (scheme == EFUSE_CODING_SCHEME_3_4) {
@ -229,7 +233,7 @@ void esp_efuse_utility_erase_virt_blocks()
void esp_efuse_utility_update_virt_blocks()
{
#ifdef CONFIG_EFUSE_VIRTUAL
ESP_LOGI(TAG, "Emulate efuse is enabled");
ESP_LOGI(TAG, "Loading virtual efuse blocks from real efuses");
for (int num_block = 0; num_block < COUNT_EFUSE_BLOCKS; num_block++) {
int subblock = 0;
for (uint32_t addr_rd_block = range_read_addr_blocks[num_block].start; addr_rd_block <= range_read_addr_blocks[num_block].end; addr_rd_block += 4) {

10
docs/en/api-reference/system/efuse.rst
View file

@ -248,9 +248,15 @@ The number of bits not included in square brackets is free (bits in EFUSE_BLK0 a
Debug eFuse & Unit tests
------------------------
eFuse manager have option :envvar:`CONFIG_EFUSE_VIRTUAL` in Kconfig which will make an operation write is virtual. It can help to debug app and unit tests.
Virtual eFuses
^^^^^^^^^^^^^^
esptool have an useful tool for reading/writing ESP32 eFuse bits - `espefuse.py <https://github.com/espressif/esptool/wiki/espefuse>`_.
The Kconfig option :envvar:`CONFIG_EFUSE_VIRTUAL` will virtualize eFuse values inside the eFuse Manager, so writes are emulated and no eFuse values are permanently changed. This can be useful for debugging app and unit tests.
espefuse.py
^^^^^^^^^^^
esptool includes a useful tool for reading/writing ESP32 eFuse bits - `espefuse.py <https://github.com/espressif/esptool/wiki/espefuse>`_.
::