/******************************************************************************
Causes the given endpoint to acknowledge the next packet it receives with
a STALL handshake.
******************************************************************************/
void stallData(void)
{
if (UDP_ENDPOINT_IDLE != epState)
return;
setCSR(UDP_CSR_FORCESTALL);
}
/******************************************************************************
Sends data through a USB endpoint.
Parameters:
data - Pointer to a buffer with the data to send.
size - Size of the data buffer.
callback - Optional callback function to invoke when the transfer is complete.
argument - Optional argument to the callback function.
******************************************************************************/
void txUsbData(void *data, uint32_t size, TransferCallback_t callback, void *argument)
{
// Setup the transfer descriptor
transfer.data = (void *) data;
transfer.remaining = size;
transfer.buffered = 0;
transfer.transferred = 0;
transfer.callback = callback;
transfer.argument = argument;
// Send the first packet
epState = UDP_ENDPOINT_SENDING;
while (UDP_CSR_TXPKTRDY == (UDP->UDP_CSR[EP_NUMBER] & UDP_CSR_TXPKTRDY));
writePayload();
setCSR(UDP_CSR_TXPKTRDY);
}
/**************************************************************************//**
\brief Startup initialization of the usb.
******************************************************************************/
void hwInitUsbDfu(void)
{
// enables main clock on UDP for master clock domain
PMC->PMC_PCER1 = (1ul << (ID_UDP - START_ID_NUMBER_FOR_PMC1));
// enables 48 MHz clock on UDP phy for 12 MHz domain
PMC->PMC_SCER = PMC_SCER_UDP;
// Clear interrupt
UDP->UDP_ICR = UDP_ICR_WAKEUP | UDP_ICR_RXSUSP | UDP_ICR_RXRSM;
// enables UDP transceiver
UDP->UDP_TXVC &= ~UDP_TXVC_TXVDIS;
UDP->UDP_TXVC |= UDP_TXVC_PUON;
// wait for usb bus reset
while (!(UDP->UDP_ISR & UDP_ISR_ENDBUSRES));
// Acknowledge end of bus reset interrupt and the others
UDP->UDP_ICR = UDP_ISR_ENDBUSRES | UDP_ISR_WAKEUP | UDP_ISR_RXRSM | UDP_ISR_RXSUSP;
// Reset Endpoint 0 Fifos
UDP->UDP_RST_EP |= UDP_RST_EP_EP0;
UDP->UDP_RST_EP &= ~UDP_RST_EP_EP0;
// Configure endpoint 0
setCSR(UDP_CSR_EPEDS | UDP_CSR_EPTYPE_CTRL | EP_OUT);
// enumeration
while (!(UDP->UDP_GLB_STAT & UDP_GLB_STAT_CONFG))
epHandler();
}
/**************************************************************************//**
\brief End point handler.
******************************************************************************/
static void epHandler(void)
{
uint16_t i;
uint8_t *ptr;
// wait for transaction on 0 endpoint
while (!(UDP->UDP_ISR & UDP_ISR_EP0INT));
// acknowledge end point 0 interrupt
UDP->UDP_ICR = UDP_ISR_EP0INT;
epStatus = UDP->UDP_CSR[EP_NUMBER];
// Handle endpoint actions
// IN packet sent
if (epStatus & UDP_CSR_TXCOMP)
{
// Check that endpoint was in Sending state
if (UDP_ENDPOINT_SENDING == epState)
{
if (transfer.buffered < END_POINT_MAX_SIZE)
{ // transfer is finished
transfer.transferred += transfer.buffered;
transfer.buffered = 0;
clearCSR(UDP_CSR_TXCOMP);
// Endpoint returns in Idle state
epState = UDP_ENDPOINT_IDLE;
endOfTransfer();
}
else
{
// Transfer remaining data
transfer.transferred += END_POINT_MAX_SIZE;
transfer.buffered -= END_POINT_MAX_SIZE;
// Send next packet
writePayload();
setCSR(UDP_CSR_TXPKTRDY);
clearCSR(UDP_CSR_TXCOMP);
}
}
else
{
// Acknowledge transaction
clearCSR(UDP_CSR_TXCOMP);
}
}
// OUT packet received
if (epStatus & UDP_RXDATA)
{
// Check that the endpoint is in Receiving state
if (UDP_ENDPOINT_RECEIVING != epState)
{
// Check if an ACK has been received on a Control endpoint
if ((epStatus & UDP_CSR_RXBYTECNT) == 0)
{
// Acknowledge the data and finish the current transfer
// Notify USB peripheral device that data have been read in the FIFO's Bank 0.
UDP->UDP_CSR[EP_NUMBER] &= ~UDP_CSR_RX_DATA_BK0;
while ((UDP->UDP_CSR[EP_NUMBER] & UDP_CSR_RX_DATA_BK0) == UDP_CSR_RX_DATA_BK0);
// Endpoint returns in Idle state
epState = UDP_ENDPOINT_IDLE;
endOfTransfer();
}
// Check if the data has been STALLed
else if (epStatus & UDP_CSR_FORCESTALL)
{
// Discard STALLed data
// Notify USB peripheral device that data have been read in the FIFO's Bank 0.
UDP->UDP_CSR[EP_NUMBER] &= ~UDP_CSR_RX_DATA_BK0;
while ((UDP->UDP_CSR[EP_NUMBER] & UDP_CSR_RX_DATA_BK0) == UDP_CSR_RX_DATA_BK0);
}
}
// Endpoint is in Read state
else
{
// Retrieve data and store it into the current transfer buffer
uint16_t size = (uint16_t)(epStatus >> 16);
readPayload(size);
// Notify USB peripheral device that data have been read in the FIFO's Bank 0.
UDP->UDP_CSR[EP_NUMBER] &= ~UDP_CSR_RX_DATA_BK0;
while ((UDP->UDP_CSR[EP_NUMBER] & UDP_CSR_RX_DATA_BK0) == UDP_CSR_RX_DATA_BK0);
// Check if the transfer is finished
if ((transfer.remaining == 0) || (size < END_POINT_MAX_SIZE))
{
// Endpoint returns in Idle state
epState = UDP_ENDPOINT_IDLE;
endOfTransfer();
}
}
}
// SETUP packet received
if (epStatus & UDP_CSR_RXSETUP)
{
// If a transfer was pending, complete it
// Handles the case where during the status phase of a control write
// transfer, the host receives the device ZLP and ack it, but the ack
// is not received by the device
if ((UDP_ENDPOINT_RECEIVING == epState) || (UDP_ENDPOINT_SENDING == epState))
{
// Endpoint returns in Idle state
epState = UDP_ENDPOINT_IDLE;
endOfTransfer();
}
// Copy packet
ptr = (uint8_t *)&request;
for (i = 0; i < (uint16_t)(epStatus >> 16); i++)
{
*ptr = (uint8_t)UDP->UDP_FDR[EP_NUMBER];
ptr++;
}
// Set the DIR bit before clearing RXSETUP in Control IN sequence
// Transfer direction is located in bit D7 of the bmRequestType field
if (request.bmRequestType & 0x80)
setCSR(UDP_CSR_DIR);
clearCSR(UDP_CSR_RXSETUP);
// Forward the request to the upper layer
runtimeRequestHandler();
}
// STALL sent
if (epStatus & UDP_CSR_STALLSENTISOERROR)
{
// If the endpoint is not halted, clear the STALL condition
clearCSR(UDP_CSR_STALLSENTISOERROR);
clearCSR(UDP_CSR_FORCESTALL);
}
}
static void
andCSR(Processor *p, int csr, DWORD v) {
setCSR(p, csr, v & getCSR(p, csr));
}
static void
orCSR(Processor *p, int csr, DWORD v) {
setCSR(p, csr, v | getCSR(p, csr));
}