/** \brief USB Setup Handler
*
* This function should be called either from the USB interrupt or the main loop when the \c USBIIF.EP0IF
* flag has been set. Keep in mind that all bits in \c USBIIF register are cleared when the register is
* read. A detailed description of the framework is found in the \ref section_setup_handler_usage
* section.
*
* \note The USB header data is always little-endian, so if a big-endian compiler is used (such as Keil
* C51), the 16-bit values in the \ref usbSetupHeader must be flipped before they are used.
*/
void usbfwSetupHandler(void)
{
uint8 controlReg;
uint8 bytesNow;
uint8 oldEndpoint;
// Save the old index setting, then select endpoint 0 and fetch the control register
oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
USBFW_SELECT_ENDPOINT(0);
controlReg = USBCS0;
// The last transfer was ended prematurely by a new SETUP packet
if (controlReg & USBCS0_SETUP_END) {
USBCS0 = USBCS0_CLR_SETUP_END;
usbfwData.ep0Status = EP_CANCEL;
if (ProcessFunc) ProcessFunc();
usbfwData.ep0Status = EP_IDLE;
}
// A STALL handshake was transmitted to the PC
if (controlReg & USBCS0_SENT_STALL) {
USBCS0 = 0x00;
usbfwData.ep0Status = EP_IDLE;
}
// Receive OUT packets
if (usbfwData.ep0Status == EP_RX) {
// Read FIFO
bytesNow = USBCNT0;
usbfwReadFifo(&USBF0, bytesNow, usbSetupData.pBuffer);
usbSetupData.bytesLeft -= bytesNow;
usbSetupData.pBuffer += bytesNow;
// Arm the endpoint
USBCS0 = usbSetupData.bytesLeft ? USBCS0_CLR_OUTPKT_RDY : (USBCS0_CLR_OUTPKT_RDY | USBCS0_DATA_END);
// Make a call to the appropriate request handler when done
if (usbSetupData.bytesLeft == 0) {
if (ProcessFunc) ProcessFunc();
usbfwData.ep0Status = EP_IDLE;
}
// Return here since nothing more will happen until the next interrupt
USBFW_SELECT_ENDPOINT(oldEndpoint);
return;
// Let the application handle the reception
} else if (usbfwData.ep0Status == EP_MANUAL_RX) {
ProcessFunc();
}
// Receive SETUP header
if (usbfwData.ep0Status == EP_IDLE) {
if (controlReg & USBCS0_OUTPKT_RDY) {
usbfwReadFifo(&USBF0, 8, (uint8 __xdata *) &usbSetupHeader);
// Handle control transfers individually
ProcessFunc = NULL;
switch (usbSetupHeader.requestType & (RT_MASK_TYPE | RT_MASK_DIR)) {
// Standard requests with data from the host (OUT)
case RT_STD_OUT:
switch (usbSetupHeader.request) {
case SET_ADDRESS: usbsrSetAddress(); break;
case SET_FEATURE: usbsrSetFeature(); break;
case CLEAR_FEATURE: usbsrClearFeature(); break;
case SET_CONFIGURATION: usbsrSetConfiguration(); break;
case SET_INTERFACE: usbsrSetInterface(); break;
case SET_DESCRIPTOR: /*usbsrHookSetDescriptor(); break; - unsupported */
default: usbfwData.ep0Status = EP_STALL; break;
}
break;
// Standard requests with data to the host (IN)
case RT_STD_IN:
switch (usbSetupHeader.request) {
case GET_STATUS: usbsrGetStatus(); break;
case GET_DESCRIPTOR: usbsrGetDescriptor(); break;
case GET_CONFIGURATION: usbsrGetConfiguration(); break;
case GET_INTERFACE: usbsrGetInterface(); break;
case SYNCH_FRAME: /*usbsrHookSynchFrame(); break; - unsupported */
default: usbfwData.ep0Status = EP_STALL; break;
}
break;
// Vendor requests
case RT_VEND_OUT:
ProcessFunc = usbvrHookProcessOut; usbvrHookProcessOut();
break;
case RT_VEND_IN:
ProcessFunc = usbvrHookProcessIn; usbvrHookProcessIn();
break;
// Class requests
case RT_CLASS_OUT:
ProcessFunc = usbcrHookProcessOut; usbcrHookProcessOut();
break;
case RT_CLASS_IN:
ProcessFunc = usbcrHookProcessIn; usbcrHookProcessIn();
break;
// Unrecognized request: Stall the endpoint
default:
usbfwData.ep0Status = EP_STALL;
break;
}
// Arm/stall the endpoint
USBCS0 = (usbfwData.ep0Status == EP_STALL) ? (USBCS0_CLR_OUTPKT_RDY | USBCS0_SEND_STALL) : USBCS0_CLR_OUTPKT_RDY;
}
}
// Transmit IN packets
if (usbfwData.ep0Status == EP_TX) {
controlReg = USBCS0_INPKT_RDY;
// The last frame should contain 0 to (EP0_PACKET_SIZE - 1) bytes
if (usbSetupData.bytesLeft < EP0_PACKET_SIZE) {
bytesNow = usbSetupData.bytesLeft;
controlReg |= USBCS0_DATA_END;
// All other packets should have the maximum length
} else {
bytesNow = EP0_PACKET_SIZE;
}
// Load the FIFO and move the pointer
usbfwWriteFifo(&USBF0, bytesNow, usbSetupData.pBuffer);
usbSetupData.pBuffer += bytesNow;
usbSetupData.bytesLeft -= bytesNow;
// Arm the FIFO (even for a zero-length packet)
USBCS0 = controlReg;
// Make a call to the appropriate request handler when done
if (bytesNow < EP0_PACKET_SIZE) {
if (ProcessFunc) ProcessFunc();
usbfwData.ep0Status = EP_IDLE;
}
// Let the application handle the transmission
} else if (usbfwData.ep0Status == EP_MANUAL_TX) {
ProcessFunc();
}
// Restore the old index setting
USBFW_SELECT_ENDPOINT(oldEndpoint);
} // usbfwSetupHandler
/** \brief USB Setup Handler
*
* This function should be called either from the USB interrupt or the main loop when the
* \c USB_IIF.EP0IF flag has been set. A detailed description of the framework is found in the
* \ref section_setup_handler_usage section.
*/
void usbfwSetupHandler(void)
{
uint32_t controlReg;
uint32_t oldEndpoint;
uint32_t bytesNow;
//
// Save the old index setting, then select endpoint 0 and fetch the control register
//
oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
USBFW_SELECT_ENDPOINT(0);
controlReg = HWREG(USB_CS0);
//
// Update the USB device address after the status stage
//
if(usbfwData.ep0Status == EP_ADDRESS)
{
if(!(controlReg & USB_CS0_OUTPKTRDY_M))
{
uint8_t address = usbSetupHeader.valueLsb;
HWREG(USB_ADDR) = address;
if(usbfwData.usbState < DEV_CONFIGURED)
{
if(address)
{
usbfwData.usbState = DEV_ADDRESS;
}
else
{
usbfwData.usbState = DEV_DEFAULT;
}
}
}
usbfwData.ep0Status = EP_IDLE;
}
//
// A STALL handshake was transmitted to the host
//
if(controlReg & USB_CS0_SENTSTALL_M)
{
HWREG(USB_CS0) = 0x00;
usbfwData.ep0Status = EP_IDLE;
}
//
// The last transfer was ended prematurely by a new SETUP packet
//
if(controlReg & USB_CS0_SETUPEND_M)
{
HWREG(USB_CS0) = USB_CS0_CLRSETUPEND_M;
usbfwData.ep0Status = EP_CANCEL;
if(pProcessFunc)
{
pProcessFunc();
}
usbfwData.ep0Status = EP_IDLE;
}
//
// Receive OUT packets
//
if(usbfwData.ep0Status == EP_RX)
{
if(controlReg & USB_CS0_OUTPKTRDY_M)
{
//
// Read FIFO
//
uint32_t bytesNow = HWREG(USB_CNT0);
usbfwReadFifo(USB_F0, bytesNow, usbSetupData.pBuffer);
usbSetupData.bytesLeft -= bytesNow;
usbSetupData.pBuffer = ((uint8_t*) usbSetupData.pBuffer) + bytesNow;
//
// Arm the endpoint
//
if(usbSetupData.bytesLeft)
{
HWREG(USB_CS0) = USB_CS0_CLROUTPKTRDY_M;
}
else
{
HWREG(USB_CS0) = USB_CS0_CLROUTPKTRDY_M | USB_CS0_DATAEND_M;
}
//
// Make a call to the appropriate request handler when done
//
if(usbSetupData.bytesLeft == 0)
{
if(pProcessFunc)
{
pProcessFunc();
}
usbfwData.ep0Status = EP_IDLE;
}
}
//
// Return here since nothing more will happen until the next interrupt
//
USBFW_SELECT_ENDPOINT(oldEndpoint);
return;
//
// Let the application handle the reception
//
}
else if(usbfwData.ep0Status == EP_MANUAL_RX)
{
if(pProcessFunc)
{
pProcessFunc();
}
}
//
// Receive SETUP header
//
if(usbfwData.ep0Status == EP_IDLE)
{
if(controlReg & USB_CS0_OUTPKTRDY_M)
{
usbfwReadFifo(USB_F0, 8, &usbSetupHeader);
//
// Handle control transfers individually
//
pProcessFunc = NULL;
switch(usbSetupHeader.requestType & (RT_MASK_TYPE | RT_MASK_DIR))
{
//
// Standard requests without data or with data from the host (OUT)
//
case RT_STD_OUT:
switch(usbSetupHeader.request)
{
case USBSR_REQ_SET_ADDRESS:
usbsrSetAddress();
break;
case USBSR_REQ_SET_FEATURE:
usbsrSetFeature();
break;
case USBSR_REQ_CLEAR_FEATURE:
usbsrClearFeature();
break;
case USBSR_REQ_SET_CONFIGURATION:
usbsrSetConfiguration();
break;
case USBSR_REQ_SET_INTERFACE:
usbsrSetInterface();
break;
case USBSR_REQ_SET_DESCRIPTOR:
pProcessFunc = usbsrHookSetDescriptor;
usbsrHookSetDescriptor();
break;
default:
usbfwData.ep0Status = EP_STALL;
break;
}
break;
//
// Standard requests with data to the host (IN)
//
case RT_STD_IN:
switch(usbSetupHeader.request)
{
case USBSR_REQ_GET_STATUS:
usbsrGetStatus();
break;
case USBSR_REQ_GET_DESCRIPTOR:
usbsrGetDescriptor();
break;
case USBSR_REQ_GET_CONFIGURATION:
usbsrGetConfiguration();
break;
case USBSR_REQ_GET_INTERFACE:
usbsrGetInterface();
break;
case USBSR_REQ_SYNCH_FRAME:
pProcessFunc = usbsrHookSynchFrame;
usbsrHookSynchFrame();
break;
default:
usbfwData.ep0Status = EP_STALL;
break;
}
break;
//
// Vendor requests
//
case RT_VEND_OUT:
pProcessFunc = usbvrHookProcessOut;
usbvrHookProcessOut();
break;
case RT_VEND_IN:
pProcessFunc = usbvrHookProcessIn;
usbvrHookProcessIn();
break;
//
// Class requests
//
case RT_CLASS_OUT:
pProcessFunc = usbcrHookProcessOut;
usbcrHookProcessOut();
break;
case RT_CLASS_IN:
pProcessFunc = usbcrHookProcessIn;
usbcrHookProcessIn();
break;
//
// Unrecognized request: Stall the endpoint
//
default:
usbfwData.ep0Status = EP_STALL;
break;
}
//
// Arm/stall the endpoint
//
if(usbfwData.ep0Status == EP_STALL)
{
HWREG(USB_CS0) = USB_CS0_CLROUTPKTRDY_M | USB_CS0_SENDSTALL_M;
}
else if((usbfwData.ep0Status == EP_TX) || (usbfwData.ep0Status == EP_RX))
{
HWREG(USB_CS0) = USB_CS0_CLROUTPKTRDY_M;
}
else
{
HWREG(USB_CS0) = USB_CS0_CLROUTPKTRDY_M | USB_CS0_DATAEND_M;
}
}
}
//
// Transmit IN packets
//
if(usbfwData.ep0Status == EP_TX)
{
controlReg = USB_CS0_INPKTRDY_M;
//
// The last frame should contain 0 to (EP0_PACKET_SIZE - 1) bytes
//
if(usbSetupData.bytesLeft < USB_EP0_PACKET_SIZE)
{
bytesNow = usbSetupData.bytesLeft;
controlReg |= USB_CS0_DATAEND_M;
}
else
{
//
// All other packets should have the maximum length
//
bytesNow = USB_EP0_PACKET_SIZE;
}
//
// Load the FIFO and move the pointer
//
usbfwWriteFifo(USB_F0, bytesNow, usbSetupData.pBuffer);
usbSetupData.pBuffer = ((uint8_t*) usbSetupData.pBuffer) + bytesNow;
usbSetupData.bytesLeft -= bytesNow;
//
// Arm the FIFO (even for a zero-length packet)
//
HWREG(USB_CS0) = controlReg;
//
// Make a call to the appropriate request handler when done
//
if(bytesNow < USB_EP0_PACKET_SIZE)
{
if(pProcessFunc)
{
pProcessFunc();
}
usbfwData.ep0Status = EP_IDLE;
}
//
// Let the application handle the transmission
//
}
else if(usbfwData.ep0Status == EP_MANUAL_TX)
{
if(pProcessFunc)
{
pProcessFunc();
}
}
//
// Restore the old index setting
//
USBFW_SELECT_ENDPOINT(oldEndpoint);
}
