mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-05 11:37:46 +00:00
Michael Smith
305 lines
8.2 KiB
Go
305 lines
8.2 KiB
Go
//go:build rp2040 || rp2350
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package machine
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import (
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"machine/usb"
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"runtime/volatile"
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"unsafe"
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)
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const NumberOfUSBEndpoints = 8
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var (
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sendOnEP0DATADONE struct {
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offset int
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data []byte
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pid uint32
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}
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endPoints = []uint32{
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usb.CONTROL_ENDPOINT: usb.ENDPOINT_TYPE_CONTROL,
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usb.CDC_ENDPOINT_ACM: (usb.ENDPOINT_TYPE_INTERRUPT | usb.EndpointIn),
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usb.CDC_ENDPOINT_OUT: (usb.ENDPOINT_TYPE_BULK | usb.EndpointOut),
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usb.CDC_ENDPOINT_IN: (usb.ENDPOINT_TYPE_BULK | usb.EndpointIn),
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usb.HID_ENDPOINT_IN: (usb.ENDPOINT_TYPE_DISABLE), // Interrupt In
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usb.HID_ENDPOINT_OUT: (usb.ENDPOINT_TYPE_DISABLE), // Interrupt Out
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usb.MIDI_ENDPOINT_IN: (usb.ENDPOINT_TYPE_DISABLE), // Bulk In
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usb.MIDI_ENDPOINT_OUT: (usb.ENDPOINT_TYPE_DISABLE), // Bulk Out
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}
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)
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func initEndpoint(ep, config uint32) {
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val := uint32(usbEpControlEnable) | uint32(usbEpControlInterruptPerBuff)
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offset := ep*2*usbBufferLen + 0x100
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val |= offset
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// Bulk and interrupt endpoints must have their Packet ID reset to DATA0 when un-stalled.
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epXPIDReset[ep] = false // Default to false in case an endpoint is re-initialized.
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switch config {
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case usb.ENDPOINT_TYPE_INTERRUPT | usb.EndpointIn:
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val |= usbEpControlEndpointTypeInterrupt
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_usbDPSRAM.EPxControl[ep].In.Set(val)
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epXPIDReset[ep] = true
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case usb.ENDPOINT_TYPE_BULK | usb.EndpointOut:
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val |= usbEpControlEndpointTypeBulk
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_usbDPSRAM.EPxControl[ep].Out.Set(val)
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
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epXPIDReset[ep] = true
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case usb.ENDPOINT_TYPE_INTERRUPT | usb.EndpointOut:
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val |= usbEpControlEndpointTypeInterrupt
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_usbDPSRAM.EPxControl[ep].Out.Set(val)
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
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epXPIDReset[ep] = true
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case usb.ENDPOINT_TYPE_BULK | usb.EndpointIn:
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val |= usbEpControlEndpointTypeBulk
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_usbDPSRAM.EPxControl[ep].In.Set(val)
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epXPIDReset[ep] = true
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case usb.ENDPOINT_TYPE_CONTROL:
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val |= usbEpControlEndpointTypeControl
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBuf0CtrlData1Pid)
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
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}
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}
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// SendUSBInPacket sends a packet for USB (interrupt in / bulk in).
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func SendUSBInPacket(ep uint32, data []byte) bool {
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sendUSBPacket(ep, data, 0)
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return true
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}
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// Prevent file size increases: https://github.com/tinygo-org/tinygo/pull/998
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//
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//go:noinline
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func sendUSBPacket(ep uint32, data []byte, maxsize uint16) {
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count := len(data)
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if 0 < int(maxsize) && int(maxsize) < count {
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count = int(maxsize)
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}
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if ep == 0 {
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if count > usb.EndpointPacketSize {
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count = usb.EndpointPacketSize
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sendOnEP0DATADONE.offset = count
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sendOnEP0DATADONE.data = data
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} else {
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sendOnEP0DATADONE.offset = 0
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}
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epXdata0[ep] = true
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}
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sendViaEPIn(ep, data, count)
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}
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func ReceiveUSBControlPacket() ([cdcLineInfoSize]byte, error) {
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var b [cdcLineInfoSize]byte
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ep := 0
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for !_usbDPSRAM.EPxBufferControl[ep].Out.HasBits(usbBuf0CtrlFull) {
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// TODO: timeout
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}
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ctrl := _usbDPSRAM.EPxBufferControl[ep].Out.Get()
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
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sz := ctrl & usbBuf0CtrlLenMask
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copy(b[:], _usbDPSRAM.EPxBuffer[ep].Buffer0[:sz])
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlData1Pid)
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
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return b, nil
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}
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func handleEndpointRx(ep uint32) []byte {
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ctrl := _usbDPSRAM.EPxBufferControl[ep].Out.Get()
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(usbBufferLen & usbBuf0CtrlLenMask)
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sz := ctrl & usbBuf0CtrlLenMask
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return _usbDPSRAM.EPxBuffer[ep].Buffer0[:sz]
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}
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// AckUsbOutTransfer is called to acknowledge the completion of a USB OUT transfer.
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func AckUsbOutTransfer(ep uint32) {
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ep = ep & 0x7F
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setEPDataPID(ep, !epXdata0[ep])
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}
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// Set the USB endpoint Packet ID to DATA0 or DATA1.
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func setEPDataPID(ep uint32, dataOne bool) {
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epXdata0[ep] = dataOne
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if epXdata0[ep] || ep == 0 {
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlData1Pid)
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}
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_usbDPSRAM.EPxBufferControl[ep].Out.SetBits(usbBuf0CtrlAvail)
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}
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func SendZlp() {
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sendUSBPacket(0, []byte{}, 0)
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}
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func sendViaEPIn(ep uint32, data []byte, count int) {
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// Prepare buffer control register value
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val := uint32(count) | usbBuf0CtrlAvail
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// DATA0 or DATA1
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epXdata0[ep&0x7F] = !epXdata0[ep&0x7F]
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if !epXdata0[ep&0x7F] {
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val |= usbBuf0CtrlData1Pid
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}
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// Mark as full
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val |= usbBuf0CtrlFull
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copy(_usbDPSRAM.EPxBuffer[ep&0x7F].Buffer0[:], data[:count])
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_usbDPSRAM.EPxBufferControl[ep&0x7F].In.Set(val)
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}
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// Set ENDPOINT_HALT/stall status on a USB IN endpoint.
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func (dev *USBDevice) SetStallEPIn(ep uint32) {
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ep = ep & 0x7F
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// Prepare buffer control register value
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if ep == 0 {
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armEPZeroStall()
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}
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val := uint32(usbBuf0CtrlFull)
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_usbDPSRAM.EPxBufferControl[ep].In.Set(val)
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val |= uint32(usbBuf0CtrlStall)
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_usbDPSRAM.EPxBufferControl[ep].In.Set(val)
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}
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// Set ENDPOINT_HALT/stall status on a USB OUT endpoint.
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func (dev *USBDevice) SetStallEPOut(ep uint32) {
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ep = ep & 0x7F
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if ep == 0 {
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panic("SetStallEPOut: EP0 OUT not valid")
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}
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val := uint32(usbBuf0CtrlStall)
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_usbDPSRAM.EPxBufferControl[ep].Out.Set(val)
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}
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// Clear the ENDPOINT_HALT/stall on a USB IN endpoint.
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func (dev *USBDevice) ClearStallEPIn(ep uint32) {
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ep = ep & 0x7F
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val := uint32(usbBuf0CtrlStall)
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_usbDPSRAM.EPxBufferControl[ep].In.ClearBits(val)
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if epXPIDReset[ep] {
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// Reset the PID to DATA0
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setEPDataPID(ep, false)
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}
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}
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// Clear the ENDPOINT_HALT/stall on a USB OUT endpoint.
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func (dev *USBDevice) ClearStallEPOut(ep uint32) {
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ep = ep & 0x7F
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val := uint32(usbBuf0CtrlStall)
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_usbDPSRAM.EPxBufferControl[ep].Out.ClearBits(val)
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if epXPIDReset[ep] {
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// Reset the PID to DATA0
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setEPDataPID(ep, false)
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}
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}
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type usbDPSRAM struct {
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// Note that EPxControl[0] is not EP0Control but 8-byte setup data.
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EPxControl [16]usbEndpointControlRegister
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EPxBufferControl [16]usbBufferControlRegister
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EPxBuffer [16]usbBuffer
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}
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type usbEndpointControlRegister struct {
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In volatile.Register32
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Out volatile.Register32
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}
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type usbBufferControlRegister struct {
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In volatile.Register32
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Out volatile.Register32
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}
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type usbBuffer struct {
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Buffer0 [usbBufferLen]byte
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Buffer1 [usbBufferLen]byte
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}
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var (
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_usbDPSRAM = (*usbDPSRAM)(unsafe.Pointer(uintptr(0x50100000)))
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epXdata0 [16]bool
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epXPIDReset [16]bool
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setupBytes [8]byte
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)
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func (d *usbDPSRAM) setupBytes() []byte {
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data := d.EPxControl[usb.CONTROL_ENDPOINT].In.Get()
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setupBytes[0] = byte(data)
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setupBytes[1] = byte(data >> 8)
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setupBytes[2] = byte(data >> 16)
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setupBytes[3] = byte(data >> 24)
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data = d.EPxControl[usb.CONTROL_ENDPOINT].Out.Get()
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setupBytes[4] = byte(data)
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setupBytes[5] = byte(data >> 8)
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setupBytes[6] = byte(data >> 16)
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setupBytes[7] = byte(data >> 24)
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return setupBytes[:]
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}
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func (d *usbDPSRAM) clear() {
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for i := 0; i < len(d.EPxControl); i++ {
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d.EPxControl[i].In.Set(0)
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d.EPxControl[i].Out.Set(0)
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d.EPxBufferControl[i].In.Set(0)
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d.EPxBufferControl[i].Out.Set(0)
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}
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}
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const (
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// DPRAM : Endpoint control register
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usbEpControlEnable = 0x80000000
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usbEpControlDoubleBuffered = 0x40000000
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usbEpControlInterruptPerBuff = 0x20000000
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usbEpControlInterruptPerDoubleBuff = 0x10000000
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usbEpControlEndpointType = 0x0c000000
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usbEpControlInterruptOnStall = 0x00020000
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usbEpControlInterruptOnNak = 0x00010000
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usbEpControlBufferAddress = 0x0000ffff
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usbEpControlEndpointTypeControl = 0x00000000
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usbEpControlEndpointTypeISO = 0x04000000
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usbEpControlEndpointTypeBulk = 0x08000000
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usbEpControlEndpointTypeInterrupt = 0x0c000000
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// Endpoint buffer control bits
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usbBuf1CtrlFull = 0x80000000
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usbBuf1CtrlLast = 0x40000000
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usbBuf1CtrlData0Pid = 0x20000000
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usbBuf1CtrlData1Pid = 0x00000000
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usbBuf1CtrlSel = 0x10000000
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usbBuf1CtrlStall = 0x08000000
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usbBuf1CtrlAvail = 0x04000000
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usbBuf1CtrlLenMask = 0x03FF0000
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usbBuf0CtrlFull = 0x00008000
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usbBuf0CtrlLast = 0x00004000
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usbBuf0CtrlData0Pid = 0x00000000
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usbBuf0CtrlData1Pid = 0x00002000
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usbBuf0CtrlSel = 0x00001000
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usbBuf0CtrlStall = 0x00000800
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usbBuf0CtrlAvail = 0x00000400
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usbBuf0CtrlLenMask = 0x000003FF
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usbBufferLen = 64
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)
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