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|
//go:build rp2040
package machine
import (
"device/rp"
"machine/usb"
"runtime/interrupt"
"runtime/volatile"
"unsafe"
)
var (
sendOnEP0DATADONE struct {
offset int
data []byte
pid uint32
}
)
// Configure the USB peripheral. The config is here for compatibility with the UART interface.
func (dev *USBDevice) Configure(config UARTConfig) {
// Reset usb controller
resetBlock(rp.RESETS_RESET_USBCTRL)
unresetBlockWait(rp.RESETS_RESET_USBCTRL)
// Clear any previous state in dpram just in case
_usbDPSRAM.clear()
// Enable USB interrupt at processor
rp.USBCTRL_REGS.INTE.Set(0)
intr := interrupt.New(rp.IRQ_USBCTRL_IRQ, handleUSBIRQ)
intr.SetPriority(0x00)
intr.Enable()
irqSet(rp.IRQ_USBCTRL_IRQ, true)
// Mux the controller to the onboard usb phy
rp.USBCTRL_REGS.USB_MUXING.Set(rp.USBCTRL_REGS_USB_MUXING_TO_PHY | rp.USBCTRL_REGS_USB_MUXING_SOFTCON)
// Force VBUS detect so the device thinks it is plugged into a host
rp.USBCTRL_REGS.USB_PWR.Set(rp.USBCTRL_REGS_USB_PWR_VBUS_DETECT | rp.USBCTRL_REGS_USB_PWR_VBUS_DETECT_OVERRIDE_EN)
// Enable the USB controller in device mode.
rp.USBCTRL_REGS.MAIN_CTRL.Set(rp.USBCTRL_REGS_MAIN_CTRL_CONTROLLER_EN)
// Enable an interrupt per EP0 transaction
rp.USBCTRL_REGS.SIE_CTRL.Set(rp.USBCTRL_REGS_SIE_CTRL_EP0_INT_1BUF)
// Enable interrupts for when a buffer is done, when the bus is reset,
// and when a setup packet is received
rp.USBCTRL_REGS.INTE.Set(rp.USBCTRL_REGS_INTE_BUFF_STATUS |
rp.USBCTRL_REGS_INTE_BUS_RESET |
rp.USBCTRL_REGS_INTE_SETUP_REQ)
// Present full speed device by enabling pull up on DP
rp.USBCTRL_REGS.SIE_CTRL.SetBits(rp.USBCTRL_REGS_SIE_CTRL_PULLUP_EN)
}
func handleUSBIRQ(intr interrupt.Interrupt) {
status := rp.USBCTRL_REGS.INTS.Get()
// Setup packet received
if (status & rp.USBCTRL_REGS_INTS_SETUP_REQ) > 0 {
rp.USBCTRL_REGS.SIE_STATUS.Set(rp.USBCTRL_REGS_SIE_STATUS_SETUP_REC)
setup := usb.NewSetup(_usbDPSRAM.setupBytes())
ok := false
if (setup.BmRequestType & usb.REQUEST_TYPE) == usb.REQUEST_STANDARD {
// Standard Requests
ok = handleStandardSetup(setup)
} else {
// Class Interface Requests
if setup.WIndex < uint16(len(usbSetupHandler)) && usbSetupHandler[setup.WIndex] != nil {
ok = usbSetupHandler[setup.WIndex](setup)
}
}
if !ok {
// Stall endpoint?
sendStallViaEPIn(0)
}
}
// Buffer status, one or more buffers have completed
if (status & rp.USBCTRL_REGS_INTS_BUFF_STATUS) > 0 {
if sendOnEP0DATADONE.offset > 0 {
ep := uint32(0)
data := sendOnEP0DATADONE.data
count := len(data) - sendOnEP0DATADONE.offset
if ep == 0 && count > usb.EndpointPacketSize {
count = usb.EndpointPacketSize
}
sendViaEPIn(ep, data[sendOnEP0DATADONE.offset:], count)
sendOnEP0DATADONE.offset += count
if sendOnEP0DATADONE.offset == len(data) {
sendOnEP0DATADONE.offset = 0
}
}
s2 := rp.USBCTRL_REGS.BUFF_STATUS.Get()
// OUT (PC -> rp2040)
for i := 0; i < 16; i++ {
if s2&(1<<(i*2+1)) > 0 {
buf := handleEndpointRx(uint32(i))
if usbRxHandler[i] != nil {
usbRxHandler[i](buf)
}
handleEndpointRxComplete(uint32(i))
}
}
// IN (rp2040 -> PC)
for i := 0; i < 16; i++ {
if s2&(1<<(i*2)) > 0 {
if usbTxHandler[i] != nil {
usbTxHandler[i]()
}
}
}
rp.USBCTRL_REGS.BUFF_STATUS.Set(s2)
}
// Bus is reset
if (status & rp.USBCTRL_REGS_INTS_BUS_RESET) > 0 {
rp.USBCTRL_REGS.SIE_STATUS.Set(rp.USBCTRL_REGS_SIE_STATUS_BUS_RESET)
fixRP2040UsbDeviceEnumeration()
rp.USBCTRL_REGS.ADDR_ENDP.Set(0)
initEndpoint(0, usb.ENDPOINT_TYPE_CONTROL)
}
}
func initEndpoint(ep, config uint32) {
val := uint32(usbEpControlEnable) | uint32(usbEpControlInterruptPerBuff)
offset := ep*2*usbBufferLen + 0x100
val |= offset
switch config {
case usb.ENDPOINT_TYPE_INTERRUPT | usb.EndpointIn:
val |= usbEpControlEndpointTypeInterrupt
_usbDPSRAM.EPxControl[ep].In.Set(val)
case usb.ENDPOINT_TYPE_BULK | usb.EndpointOut:
val |= usbEpControlEndpointTypeBulk
_usbDPSRAM.EPxControl[ep].Out.Set(val)
_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
case usb.ENDPOINT_TYPE_INTERRUPT | usb.EndpointOut:
val |= usbEpControlEndpointTypeInterrupt
_usbDPSRAM.EPxControl[ep].Out.Set(val)
_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
case usb.ENDPOINT_TYPE_BULK | usb.EndpointIn:
val |= usbEpControlEndpointTypeBulk
_usbDPSRAM.EPxControl[ep].In.Set(val)
case usb.ENDPOINT_TYPE_CONTROL:
val |= usbEpControlEndpointTypeControl
_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBuf0CtrlData1Pid)
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
}
}
func handleUSBSetAddress(setup usb.Setup) bool {
sendUSBPacket(0, []byte{}, 0)
// last, set the device address to that requested by host
// wait for transfer to complete
timeout := 3000
rp.USBCTRL_REGS.SIE_STATUS.Set(rp.USBCTRL_REGS_SIE_STATUS_ACK_REC)
for (rp.USBCTRL_REGS.SIE_STATUS.Get() & rp.USBCTRL_REGS_SIE_STATUS_ACK_REC) == 0 {
timeout--
if timeout == 0 {
return true
}
}
rp.USBCTRL_REGS.ADDR_ENDP.Set(uint32(setup.WValueL) & rp.USBCTRL_REGS_ADDR_ENDP_ADDRESS_Msk)
return true
}
// SendUSBInPacket sends a packet for USB (interrupt in / bulk in).
func SendUSBInPacket(ep uint32, data []byte) bool {
sendUSBPacket(ep, data, 0)
return true
}
//go:noinline
func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
count := len(data)
if 0 < int(maxsize) && int(maxsize) < count {
count = int(maxsize)
}
if ep == 0 {
if count > usb.EndpointPacketSize {
count = usb.EndpointPacketSize
sendOnEP0DATADONE.offset = count
sendOnEP0DATADONE.data = data
} else {
sendOnEP0DATADONE.offset = 0
}
epXdata0[ep] = true
}
sendViaEPIn(ep, data, count)
}
func ReceiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
var b [cdcLineInfoSize]byte
ep := 0
for !_usbDPSRAM.EPxBufferControl[ep].Out.HasBits(usbBuf0CtrlFull) {
// TODO: timeout
}
ctrl := _usbDPSRAM.EPxBufferControl[ep].Out.Get()
_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
sz := ctrl & usbBuf0CtrlLenMask
copy(b[:], _usbDPSRAM.EPxBuffer[ep].Buffer0[:sz])
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlData1Pid)
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
return b, nil
}
func handleEndpointRx(ep uint32) []byte {
ctrl := _usbDPSRAM.EPxBufferControl[ep].Out.Get()
_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
sz := ctrl & usbBuf0CtrlLenMask
return _usbDPSRAM.EPxBuffer[ep].Buffer0[:sz]
}
func handleEndpointRxComplete(ep uint32) {
epXdata0[ep] = !epXdata0[ep]
if epXdata0[ep] || ep == 0 {
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlData1Pid)
}
_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
}
func SendZlp() {
sendUSBPacket(0, []byte{}, 0)
}
func sendViaEPIn(ep uint32, data []byte, count int) {
// Prepare buffer control register value
val := uint32(count) | usbBuf0CtrlAvail
// DATA0 or DATA1
epXdata0[ep&0x7F] = !epXdata0[ep&0x7F]
if !epXdata0[ep&0x7F] {
val |= usbBuf0CtrlData1Pid
}
// Mark as full
val |= usbBuf0CtrlFull
copy(_usbDPSRAM.EPxBuffer[ep&0x7F].Buffer0[:], data[:count])
_usbDPSRAM.EPxBufferControl[ep&0x7F].In.Set(val)
}
func sendStallViaEPIn(ep uint32) {
// Prepare buffer control register value
if ep == 0 {
rp.USBCTRL_REGS.EP_STALL_ARM.Set(rp.USBCTRL_REGS_EP_STALL_ARM_EP0_IN)
}
val := uint32(usbBuf0CtrlFull)
_usbDPSRAM.EPxBufferControl[ep&0x7F].In.Set(val)
val |= uint32(usbBuf0CtrlStall)
_usbDPSRAM.EPxBufferControl[ep&0x7F].In.Set(val)
}
type usbDPSRAM struct {
// Note that EPxControl[0] is not EP0Control but 8-byte setup data.
EPxControl [16]usbEndpointControlRegister
EPxBufferControl [16]usbBufferControlRegister
EPxBuffer [16]usbBuffer
}
type usbEndpointControlRegister struct {
In volatile.Register32
Out volatile.Register32
}
type usbBufferControlRegister struct {
In volatile.Register32
Out volatile.Register32
}
type usbBuffer struct {
Buffer0 [usbBufferLen]byte
Buffer1 [usbBufferLen]byte
}
var (
_usbDPSRAM = (*usbDPSRAM)(unsafe.Pointer(uintptr(0x50100000)))
epXdata0 [16]bool
setupBytes [8]byte
)
func (d *usbDPSRAM) setupBytes() []byte {
data := d.EPxControl[usb.CONTROL_ENDPOINT].In.Get()
setupBytes[0] = byte(data)
setupBytes[1] = byte(data >> 8)
setupBytes[2] = byte(data >> 16)
setupBytes[3] = byte(data >> 24)
data = d.EPxControl[usb.CONTROL_ENDPOINT].Out.Get()
setupBytes[4] = byte(data)
setupBytes[5] = byte(data >> 8)
setupBytes[6] = byte(data >> 16)
setupBytes[7] = byte(data >> 24)
return setupBytes[:]
}
func (d *usbDPSRAM) clear() {
for i := 0; i < len(d.EPxControl); i++ {
d.EPxControl[i].In.Set(0)
d.EPxControl[i].Out.Set(0)
d.EPxBufferControl[i].In.Set(0)
d.EPxBufferControl[i].Out.Set(0)
}
}
const (
// DPRAM : Endpoint control register
usbEpControlEnable = 0x80000000
usbEpControlDoubleBuffered = 0x40000000
usbEpControlInterruptPerBuff = 0x20000000
usbEpControlInterruptPerDoubleBuff = 0x10000000
usbEpControlEndpointType = 0x0c000000
usbEpControlInterruptOnStall = 0x00020000
usbEpControlInterruptOnNak = 0x00010000
usbEpControlBufferAddress = 0x0000ffff
usbEpControlEndpointTypeControl = 0x00000000
usbEpControlEndpointTypeISO = 0x04000000
usbEpControlEndpointTypeBulk = 0x08000000
usbEpControlEndpointTypeInterrupt = 0x0c000000
// Endpoint buffer control bits
usbBuf1CtrlFull = 0x80000000
usbBuf1CtrlLast = 0x40000000
usbBuf1CtrlData0Pid = 0x20000000
usbBuf1CtrlData1Pid = 0x00000000
usbBuf1CtrlSel = 0x10000000
usbBuf1CtrlStall = 0x08000000
usbBuf1CtrlAvail = 0x04000000
usbBuf1CtrlLenMask = 0x03FF0000
usbBuf0CtrlFull = 0x00008000
usbBuf0CtrlLast = 0x00004000
usbBuf0CtrlData0Pid = 0x00000000
usbBuf0CtrlData1Pid = 0x00002000
usbBuf0CtrlSel = 0x00001000
usbBuf0CtrlStall = 0x00000800
usbBuf0CtrlAvail = 0x00000400
usbBuf0CtrlLenMask = 0x000003FF
usbBufferLen = 64
)
|