esp_mbedtls_sha256_mode_ESP_MBEDTLS_SHA256_SOFTWARE

esp_idf_sys

Constant esp_mbedtls_sha256_mode_ESP_MBEDTLS_SHA256_SOFTWARE 

Source 
pub const esp_mbedtls_sha256_mode_ESP_MBEDTLS_SHA256_SOFTWARE: esp_mbedtls_sha256_mode = 2;