CDC_ERR_OK 

 The function ended normally. 

 CDC_ERR_CMDBUSY 

 When a command is issued, the command end flag is not 1. 
 Target: All functions that check the command end flag 

 CDC_ERR_CMDNG 

 When the command is issued, the CMOK flag is not 1. 
 Target: All functions that issue commands 

 CDC_ERR_TMOUT 

 Timed out. (Waiting for response and waiting for data transfer) 
 Target: All functions that issue commands 
 CDC_GetPeriStat function, CDC_DataReady function 

 CDC_ERR_PUT 

 Waiting sector could not be reserved while waiting for data transfer preparation by writing sector data. 
 Target: CDC_DataReady function after executing the CDC_PutSctData function 

 CDC_ERR_REJECT 

 command is now REJECT. 
 Target: All functions that issue commands 

 CDC_ERR_WAIT 

 The response to the command is WAIT. 
 Target: All functions that issue commands 

 CDC_ERR_TRNS 

 The data transfer size is abnormal. 
 Target: Internal data transfer function (function starting with CDC_Tget) 

 CDC_ERR_PERI 

 Could not get periodic response. 
 Target: CDC_GetPeriStat function