fdcavalcanti opened a new pull request, #16965: URL: https://github.com/apache/nuttx/pull/16965
## Summary This merge request fixes E-Fuse driver to handle proper block and bit offset. Also adds support for using virtual E-Fuses that can be saved in flash. This is useful for MCUBoot, which is why some options have been added to it. The documentation changes now describe how the partitioning works when MCUBoot is enabled. ## Impact - Impact on user: No. - Impact on build: No. - Impact on hardware: No. - Impact on documentation: No. - Impact on security: No. - Impact on compatibility: Changes how E-Fuse block is selected. Previously it would not work on the proper block, now it does. ## Testing The following example tests reading the MAC Address from E-Fuse. E-Fuse table can be found [here](https://docs.espressif.com/projects/esp-idf/en/v5.5/esp32c3/api-reference/system/efuse.html) and also on the Technincal Reference Manual for the SoC. ### Building - ./tools/configure.sh esp32c3-generic:efuse - Enable DEBUG_ASSERTIONS Include the following example to the build system (I can provide full code if needed, just added a simple snippet): ``` #define ESP_EFUSE_MAC_BLK ESP_EFUSE_MAC_FACTORY[0][0].efuse_block #define ESP_EFUSE_MAC_START ESP_EFUSE_MAC_FACTORY[5][0].bit_start #define ESP_EFUSE_MAC_BITLEN 48 #define ESP_EFUSE_MAC_OFFSET (ESP_EFUSE_MAC_BLK * ESP_EFUSE_BLK_SIZE) + ESP_EFUSE_MAC_START int main(int argc, FAR char *argv[]) { uint8_t mac[6] = { 0x0 }; int fd; int ret; struct efuse_param_s param; struct efuse_desc_s mac_addr = { .bit_offset = ESP_EFUSE_MAC_OFFSET, .bit_count = ESP_EFUSE_MAC_BITLEN }; const efuse_desc_t* desc[] = { &mac_addr, NULL }; fd = open("/dev/efuse", O_RDONLY); if (fd < 0) { printf("Failed to open /dev/efuse, error = %d!\n", errno); return -ENODEV; } param.field = desc; param.size = ESP_EFUSE_MAC_BITLEN; param.data = mac; ret = ioctl(fd, EFUSEIOC_READ_FIELD, ¶m); if (ret < 0) { printf("Failed to run ioctl EFUSEIOC_READ_FIELD_BIT, error = %d!\n", errno); close(fd); return -EINVAL; } printf("MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", param.data[5], param.data[4], param.data[3], param.data[2], param.data[1], param.data[0]); return OK; } ``` ### Running Run the program showed above, and it should read from the MAC E-Fuse block. ### Results MAC Address reads succesfully. ``` nsh> efuse esp_efuse_lowerhalf_read: read from blk_num: 1, bit_start: 0, bit_count: 48 D (421) efuse: BLK1 REG0 [0-31], len=32 bits D (424) efuse: BLK1 REG1 [0-15], len=16 bits MAC address: 58:cf:79:07:51:e8 nsh> ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
