Function esp_efuse_read_reg 

pub unsafe extern "C" fn esp_efuse_read_reg(
    blk: u32,
    num_reg: u32,
) -> u32

@brief Returns value of efuse register.

This is a thread-safe implementation. Example: EFUSE_BLK2_RDATA3_REG where (blk=2, num_reg=3) @note Please note that reading in the batch mode does not show uncommitted changes.

@param[in] blk Block number of eFuse. @param[in] num_reg The register number in the block.

@return Value of register