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esp32s3-usbserial: split usb

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This commit is contained in:
Dima Jolkin
2026-02-16 21:59:02 +02:00
committed by deadprogram
parent d364ac6024
commit c053b8fc8a
5 changed files with 138 additions and 184 deletions
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src/machine/machine_esp32c3.go
-96
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@@ -509,102 +509,6 @@ func (uart *UART) writeByte(b byte) error {
func (uart *UART) flush() {}
type Serialer interface {
WriteByte(c byte) error
Write(data []byte) (n int, err error)
Configure(config UARTConfig) error
Buffered() int
ReadByte() (byte, error)
DTR() bool
RTS() bool
}
func initUSB() {
// nothing to do here
}
// USB Serial/JTAG Controller
// See esp32-c3_technical_reference_manual_en.pdf
// pg. 736
type USB_DEVICE struct {
Bus *esp.USB_DEVICE_Type
}
var (
_USBCDC = &USB_DEVICE{
Bus: esp.USB_DEVICE,
}
USBCDC Serialer = _USBCDC
)
var (
errUSBWrongSize = errors.New("USB: invalid write size")
errUSBCouldNotWriteAllData = errors.New("USB: could not write all data")
errUSBBufferEmpty = errors.New("USB: read buffer empty")
)
func (usbdev *USB_DEVICE) Configure(config UARTConfig) error {
return nil
}
func (usbdev *USB_DEVICE) WriteByte(c byte) error {
if usbdev.Bus.GetEP1_CONF_SERIAL_IN_EP_DATA_FREE() == 0 {
return errUSBCouldNotWriteAllData
}
usbdev.Bus.SetEP1_RDWR_BYTE(uint32(c))
usbdev.flush()
return nil
}
func (usbdev *USB_DEVICE) Write(data []byte) (n int, err error) {
if len(data) == 0 || len(data) > 64 {
return 0, errUSBWrongSize
}
for i, c := range data {
if usbdev.Bus.GetEP1_CONF_SERIAL_IN_EP_DATA_FREE() == 0 {
if i > 0 {
usbdev.flush()
}
return i, errUSBCouldNotWriteAllData
}
usbdev.Bus.SetEP1_RDWR_BYTE(uint32(c))
}
usbdev.flush()
return len(data), nil
}
func (usbdev *USB_DEVICE) Buffered() int {
return int(usbdev.Bus.GetEP1_CONF_SERIAL_OUT_EP_DATA_AVAIL())
}
func (usbdev *USB_DEVICE) ReadByte() (byte, error) {
if usbdev.Bus.GetEP1_CONF_SERIAL_OUT_EP_DATA_AVAIL() != 0 {
return byte(usbdev.Bus.GetEP1_RDWR_BYTE()), nil
}
return 0, nil
}
func (usbdev *USB_DEVICE) DTR() bool {
return false
}
func (usbdev *USB_DEVICE) RTS() bool {
return false
}
func (usbdev *USB_DEVICE) flush() {
usbdev.Bus.SetEP1_CONF_WR_DONE(1)
for usbdev.Bus.GetEP1_CONF_SERIAL_IN_EP_DATA_FREE() == 0 {
}
}
// GetRNG returns 32-bit random numbers using the ESP32-C3 true random number generator,
// Random numbers are generated based on the thermal noise in the system and the
// asynchronous clock mismatch.