I2CSIM_S_REQ
sim->sim_state = I2CSIM_S_REQ;
while (sim->sim_state != I2CSIM_S_REQ) {
if (sim->sim_state != I2CSIM_S_REQ) {
if (sim->sim_state == I2CSIM_S_REQ) {
if (sim->sim_state == I2CSIM_S_REQ) {