Setting callback functions for ux_device_class_cdc_acm with SSP (2.3.0 and also 2.4.0) fails

Question

The functions ux_device_class_cdc_acm_ioctl(g_cdc, UX_SLAVE_CLASS_CDC_ACM_IOCTL_TRANSMISSION_START, &call_back) and ux_device_class_cdc_acm_ioctl(g_cdc, UX_SLAVE_CLASS_CDC_ACM_IOCTL_TRANSMISSION_STOP, UX_NULL) returns error 0x54 (UX_FUNCTION_NOT_SUPPORTED). 
 Error?

IK_Renesas · Answer

Hello, 
 Apologies for the delay! 
 After checking your issue internally, we would like to inform you that: 
 If you add USBX CDC_ACM Source, USBX Source (and ThreadX source) to an SSP 2.4.0 project. 
 
 And take a look in the file ux_device_class_cdc_axm_ioctl.c 
 
 You will see the case UX_SLAVE_CLASS_CDC_ACM_IOCTL_TRANSMISSION_START is disabled, so it will fall through to the default case and the status you will get is UX_FUNCTION_NOT_SUPPORTED. 
 Which as you mentioned is defined as : 
 #define UX_FUNCTION_NOT_SUPPORTED 0x54 in ux_api.h. 
 If you go to USBX Source Properties tab and you change disable CDC ACM Non-Blocking Transmission to No in the properties for USBX source: 
 
 Case UX_SLAVE_CLASS_CDC_ACM_IOCTL_TRANSMISSION_START will be enabled. 
 
 Hope it helps. 
 Regards, 
 IK_Renesas