endpoint0.h
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#ifndef ION_DEVICE_USB_ENDPOINT0_H
#define ION_DEVICE_USB_ENDPOINT0_H
#include "setup_packet.h"
namespace Ion {
namespace USB {
namespace Device {
class RequestRecipient;
class Endpoint0 {
public:
enum class State {
Idle,
Stalled,
DataIn,
LastDataIn,
StatusIn,
DataOut,
LastDataOut,
StatusOut,
};
constexpr static int k_maxPacketSize = 64;
constexpr static int MaxTransferSize = 2048;
constexpr Endpoint0(RequestRecipient * device, RequestRecipient * interface) :
m_forceNAK(false),
m_bufferOffset(0),
m_transferBufferLength(0),
m_receivedPacketSize(0),
m_zeroLengthPacketNeeded(false),
m_request(),
m_requestRecipients{device, interface},
m_state(State::Idle),
m_largeBuffer{0}
{
}
void setup();
void setupOut();
void setOutNAK(bool nak);
void enableOut();
void reset();
bool NAKForced() const { return m_forceNAK; }
void readAndDispatchSetupPacket();
void processINpacket();
void processOUTpacket();
void flushTxFifo();
void flushRxFifo();
void setReceivedPacketSize(uint16_t size) { m_receivedPacketSize = size; }
void discardUnreadData();
void stallTransaction();
void computeZeroLengthPacketNeeded();
void setState(State state) { m_state = state; }
void sendSomeData(); // Writes the next data packet and updates the state.
void clearForOutTransactions(uint16_t wLength);
private:
uint16_t receiveSomeData();
uint16_t readPacket(void * buffer, uint16_t length);
uint16_t writePacket(const void * buffer, uint16_t length);
bool m_forceNAK;
int m_bufferOffset; // When sending large data stored in the buffer, the offset keeps tracks of which data packet should be sent next.
uint16_t m_transferBufferLength;
uint16_t m_receivedPacketSize;
bool m_zeroLengthPacketNeeded;
SetupPacket m_request;
RequestRecipient * m_requestRecipients[2];
State m_state;
uint8_t m_largeBuffer[MaxTransferSize];
};
}
}
}
#endif