esp->prev_soff = esp_dev->sync_max_offset;
esp_write(eregs->esp_soff, esp->prev_soff);
esp->prev_stp = esp_dev->sync_min_period;
esp_write(eregs->esp_stp, esp->prev_stp);
if(esp->erev > esp100a) {
esp->prev_soff = esp_dev->sync_max_offset;
esp_write(eregs->esp_soff, esp->prev_soff);
esp->prev_stp = esp_dev->sync_min_period;
esp_write(eregs->esp_stp, esp->prev_stp);
if(esp->erev > esp100a) {