ehc_read_pcf8574a
int ehc_read_pcf8574a(struct ehc_envcunit *, int, uint8_t *, int);
status = ehc_read_pcf8574a((struct ehc_envcunit *)unitp,
status = ehc_read_pcf8574a((struct ehc_envcunit *)unitp,
status = ehc_read_pcf8574a((struct ehc_envcunit *)unitp,
status = ehc_read_pcf8574a((struct ehc_envcunit *)unitp,
status = ehc_read_pcf8574a((struct ehc_envcunit *)unitp,