Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 313 / 352

USB Controller
ui32Endpoint is the endpoint to access.
pui8Data is a pointer to the data area used as the source for the data to put into the FIFO.
ui32Size is the amount of data to put into the FIFO.
Description:
This function will put the data from the pui8Data parameter into the FIFO for this endpoint. If
a packet is already pending for transmission then this call will not put any of the data into the
FIFO and will return -1. Care should be taken to not write more data than can fit into the FIFO
allocated by the call to
ROM_USBFIFOConfigSet() .
Returns:
This call will return 0 on success, or -1 to indicate that the FIFO is in use and cannot be written.
24.3.1.16 ROM_USBEndpointDataSend
Starts the transfer of data from an endpoint’s FIFO.
Prototype:
int32_t
ROM_USBEndpointDataSend(uint32_t ui32Base,
uint32_t ui32Endpoint,
uint32_t ui32TransType)
ROM Location:
ROM_APITABLE
is an array of pointers located at
0x0100.0010
.
ROM_USBTABLE
is an array of pointers located at
ROM_APITABLE[16]
.
ROM_USBEndpointDataSend
is a function pointer located at
ROM_USBTABLE[12]
.
Parameters:
ui32Base specifies the USB module base address.
ui32Endpoint is the endpoint to access.
ui32TransType is set to indicate what type of data is being sent.
Description:
This function will start the transfer of data from the FIFO for a given endpoint. This is necessary
if the
USB_EP_AUTO_SET bit was not enabled for the endpoint. Setting the ui32TransType
parameter will allow the appropriate signaling on the USB bus for the type of transaction being
requested. The
ui32TransType parameter should be one of the following:
USB_TRANS_OUT for OUT transaction on any endpoint in host mode.
USB_TRANS_IN for IN transaction on any endpoint in device mode.
USB_TRANS_IN_LAST for the last IN transactions on endpoint zero in a sequence of IN
transactions.
USB_TRANS_SETUP for setup transactions on endpoint zero.
USB_TRANS_STATUS for status results on endpoint zero.
Returns:
This call will return 0 on success, or -1 if a transmission is already in progress.
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