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https://github.com/tinygo-org/tinygo.git
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machine/atsamd21: support for USB CDC aka serial interface
Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
committed by
Ayke van Laethem
Ayke van Laethem
parent
7f027ddd33
commit
5438f16fcb
@@ -8,9 +8,12 @@
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package machine
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import (
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"bytes"
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"device/arm"
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"device/sam"
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"encoding/binary"
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"errors"
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"unsafe"
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)
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const CPU_FREQUENCY = 48000000
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@@ -57,6 +60,19 @@ func (p GPIO) Configure(config GPIOConfig) {
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}
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// enable port config
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p.setPinCfg(sam.PORT_PINCFG0_PMUXEN | sam.PORT_PINCFG0_DRVSTR | sam.PORT_PINCFG0_INEN)
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case GPIO_COM:
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if p.Pin&1 > 0 {
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// odd pin, so save the even pins
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val := p.getPMux() & sam.PORT_PMUX0_PMUXE_Msk
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p.setPMux(val | (GPIO_COM << sam.PORT_PMUX0_PMUXO_Pos))
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} else {
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// even pin, so save the odd pins
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val := p.getPMux() & sam.PORT_PMUX0_PMUXO_Msk
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p.setPMux(val | (GPIO_COM << sam.PORT_PMUX0_PMUXE_Pos))
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}
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// enable port config
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p.setPinCfg(sam.PORT_PINCFG0_PMUXEN)
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}
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}
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@@ -102,11 +118,14 @@ type UART struct {
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}
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var (
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// UART0 is actually a USB CDC interface.
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UART0 = USBCDC{Buffer: NewRingBuffer()}
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// The first hardware serial port on the SAMD21. Uses the SERCOM0 interface.
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UART0 = UART{Bus: sam.SERCOM0_USART, Buffer: NewRingBuffer()}
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UART1 = UART{Bus: sam.SERCOM0_USART, Buffer: NewRingBuffer()}
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// The second hardware serial port on the SAMD21. Uses the SERCOM1 interface.
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UART1 = UART{Bus: sam.SERCOM1_USART, Buffer: NewRingBuffer()}
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UART2 = UART{Bus: sam.SERCOM1_USART, Buffer: NewRingBuffer()}
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)
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const (
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@@ -249,19 +268,19 @@ func (uart UART) WriteByte(c byte) error {
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}
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//go:export SERCOM0_IRQHandler
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func handleUART0() {
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// should reset IRQ
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UART0.Receive(byte((UART0.Bus.DATA & 0xFF)))
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UART0.Bus.INTFLAG |= sam.SERCOM_USART_INTFLAG_RXC
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}
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//go:export SERCOM1_IRQHandler
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func handleUART1() {
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// should reset IRQ
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UART1.Receive(byte((UART1.Bus.DATA & 0xFF)))
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UART1.Bus.INTFLAG |= sam.SERCOM_USART_INTFLAG_RXC
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}
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//go:export SERCOM1_IRQHandler
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func handleUART2() {
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// should reset IRQ
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UART2.Receive(byte((UART2.Bus.DATA & 0xFF)))
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UART2.Bus.INTFLAG |= sam.SERCOM_USART_INTFLAG_RXC
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}
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// I2C on the SAMD21.
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type I2C struct {
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Bus *sam.SERCOM_I2CM_Type
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@@ -906,3 +925,901 @@ func (pwm PWM) setChannel(val sam.RegValue) {
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return // not supported on this pin
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}
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}
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// USBCDC is the USB CDC aka serial over USB interface on the SAMD21.
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type USBCDC struct {
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Buffer *RingBuffer
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}
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// WriteByte writes a byte of data to the USB CDC interface.
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func (usbcdc USBCDC) WriteByte(c byte) error {
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// Supposedly to handle problem with Windows USB serial ports?
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if usbLineInfo.lineState > 0 {
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// set the data
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udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN][0] = c
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[usb_CDC_ENDPOINT_IN])))
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// clean multi packet size of bytes already sent
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE &^=
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sam.RegValue(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
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// set count of bytes to be sent
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usbEndpointDescriptors[usb_CDC_ENDPOINT_IN].DeviceDescBank[1].PCKSIZE |=
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sam.RegValue((1&usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)<<usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) |
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sam.RegValue(epPacketSize(64)<<usb_DEVICE_PCKSIZE_SIZE_Pos)
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// ack transfer complete flag
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setEPINTFLAG(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
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// send data by setting bank ready
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setEPSTATUSSET(usb_CDC_ENDPOINT_IN, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
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// wait for transfer to complete
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for (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) == 0 {
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}
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}
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return nil
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}
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const (
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// these are SAMD21 specific.
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usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos = 0
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usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask = 0x3FFF
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usb_DEVICE_PCKSIZE_SIZE_Pos = 28
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usb_DEVICE_PCKSIZE_SIZE_Mask = 0x7
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usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos = 14
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usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask = 0x3FFF
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)
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var (
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usbEndpointDescriptors [8]usbDeviceDescriptor
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udd_ep_in_cache_buffer [7][128]uint8
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udd_ep_out_cache_buffer [7][128]uint8
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isEndpointHalt = false
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isRemoteWakeUpEnabled = false
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endPoints = []uint32{usb_ENDPOINT_TYPE_CONTROL,
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(usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn),
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(usb_ENDPOINT_TYPE_BULK | usbEndpointOut),
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(usb_ENDPOINT_TYPE_BULK | usbEndpointIn)}
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usbConfiguration uint8
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usbSetInterface uint8
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usbLineInfo = cdcLineInfo{115200, 0x00, 0x00, 0x08, 0x00}
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)
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// Configure the USB CDC interface. The config is here for compatibility with the UART interface.
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func (usbcdc USBCDC) Configure(config UARTConfig) {
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// reset USB interface
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sam.USB_DEVICE.CTRLA |= sam.USB_DEVICE_CTRLA_SWRST
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for (sam.USB_DEVICE.SYNCBUSY&sam.USB_DEVICE_SYNCBUSY_SWRST) > 0 ||
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(sam.USB_DEVICE.SYNCBUSY&sam.USB_DEVICE_SYNCBUSY_ENABLE) > 0 {
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}
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sam.USB_DEVICE.DESCADD = sam.RegValue(uintptr(unsafe.Pointer(&usbEndpointDescriptors)))
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// configure pins
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GPIO{USBCDC_DM_PIN}.Configure(GPIOConfig{Mode: GPIO_COM})
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GPIO{USBCDC_DP_PIN}.Configure(GPIOConfig{Mode: GPIO_COM})
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// performs pad calibration from store fuses
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handlePadCalibration()
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// run in standby
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sam.USB_DEVICE.CTRLA |= sam.USB_DEVICE_CTRLA_RUNSTDBY
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// set full speed
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sam.USB_DEVICE.CTRLB |= (sam.USB_DEVICE_CTRLB_SPDCONF_FS << sam.USB_DEVICE_CTRLB_SPDCONF_Pos)
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// attach
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sam.USB_DEVICE.CTRLB &^= sam.USB_DEVICE_CTRLB_DETACH
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// enable interrupt for end of reset
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sam.USB_DEVICE.INTENSET |= sam.USB_DEVICE_INTENSET_EORST
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// enable interrupt for start of frame
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sam.USB_DEVICE.INTENSET |= sam.USB_DEVICE_INTENSET_SOF
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// enable USB
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sam.USB_DEVICE.CTRLA |= sam.USB_DEVICE_CTRLA_ENABLE
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// enable IRQ
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arm.EnableIRQ(sam.IRQ_USB)
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}
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func handlePadCalibration() {
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// Load Pad Calibration data from non-volatile memory
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// This requires registers that are not included in the SVD file.
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// Modeled after defines from samd21g18a.h and nvmctrl.h:
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//
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// #define NVMCTRL_OTP4 0x00806020
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//
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// #define USB_FUSES_TRANSN_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRANSN_Pos 13 /**< \brief (NVMCTRL_OTP4) USB pad Transn calibration */
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// #define USB_FUSES_TRANSN_Msk (0x1Fu << USB_FUSES_TRANSN_Pos)
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// #define USB_FUSES_TRANSN(value) ((USB_FUSES_TRANSN_Msk & ((value) << USB_FUSES_TRANSN_Pos)))
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// #define USB_FUSES_TRANSP_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRANSP_Pos 18 /**< \brief (NVMCTRL_OTP4) USB pad Transp calibration */
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// #define USB_FUSES_TRANSP_Msk (0x1Fu << USB_FUSES_TRANSP_Pos)
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// #define USB_FUSES_TRANSP(value) ((USB_FUSES_TRANSP_Msk & ((value) << USB_FUSES_TRANSP_Pos)))
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// #define USB_FUSES_TRIM_ADDR (NVMCTRL_OTP4 + 4)
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// #define USB_FUSES_TRIM_Pos 23 /**< \brief (NVMCTRL_OTP4) USB pad Trim calibration */
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// #define USB_FUSES_TRIM_Msk (0x7u << USB_FUSES_TRIM_Pos)
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// #define USB_FUSES_TRIM(value) ((USB_FUSES_TRIM_Msk & ((value) << USB_FUSES_TRIM_Pos)))
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//
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fuse := *(*uint32)(unsafe.Pointer(uintptr(0x00806020) + 4))
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calibTransN := sam.RegValue16(uint16(fuse>>13) & uint16(0x1f))
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calibTransP := sam.RegValue16(uint16(fuse>>18) & uint16(0x1f))
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calibTrim := sam.RegValue16(uint16(fuse>>23) & uint16(0x7))
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if calibTransN == 0x1f {
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calibTransN = 5
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}
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sam.USB_DEVICE.PADCAL |= (calibTransN << sam.USB_DEVICE_PADCAL_TRANSN_Pos)
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if calibTransP == 0x1f {
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calibTransP = 29
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}
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sam.USB_DEVICE.PADCAL |= (calibTransP << sam.USB_DEVICE_PADCAL_TRANSP_Pos)
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if calibTrim == 0x7 {
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calibTransN = 3
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}
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sam.USB_DEVICE.PADCAL |= (calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
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}
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//go:export USB_IRQHandler
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func handleUSB() {
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// reset all interrupt flags
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flags := sam.USB_DEVICE.INTFLAG
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sam.USB_DEVICE.INTFLAG = flags
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// End of reset
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if (flags & sam.USB_DEVICE_INTFLAG_EORST) > 0 {
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// Configure control endpoint
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initEndpoint(0, usb_ENDPOINT_TYPE_CONTROL)
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// Enable Setup-Received interrupt
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setEPINTENSET(0, sam.USB_DEVICE_EPINTENSET_RXSTP)
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usbConfiguration = 0
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// ack the End-Of-Reset interrupt
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sam.USB_DEVICE.INTFLAG = sam.USB_DEVICE_INTFLAG_EORST
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}
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// Start of frame
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if (flags & sam.USB_DEVICE_INTFLAG_SOF) > 0 {
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// if you want to blink LED showing traffic, this would be the place...
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}
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// Endpoint 0 Setup interrupt
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if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_RXSTP > 0 {
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// ack setup received
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setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_RXSTP)
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// parse setup
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setup := newUSBSetup(udd_ep_out_cache_buffer[0][:])
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// Clear the Bank 0 ready flag on Control OUT
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setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
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ok := false
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if (setup.bmRequestType & usb_REQUEST_TYPE) == usb_REQUEST_STANDARD {
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// Standard Requests
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ok = handleStandardSetup(setup)
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} else {
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// Class Interface Requests
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if setup.wIndex == usb_CDC_ACM_INTERFACE {
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ok = cdcSetup(setup)
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}
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}
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if ok {
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// set Bank1 ready
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setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
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} else {
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// Stall endpoint
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setEPSTATUSSET(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
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}
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if getEPINTFLAG(0)&sam.USB_DEVICE_EPINTFLAG_STALL1 > 0 {
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// ack the stall
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setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_STALL1)
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// clear stall request
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setEPINTENCLR(0, sam.USB_DEVICE_EPINTENCLR_STALL1)
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}
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}
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// Now the actual transfer handlers
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eptInts := sam.USB_DEVICE.EPINTSMRY & 0xFE // Remove endpoint number 0 (setup)
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var i uint32
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for i = 1; i < uint32(len(endPoints)); i++ {
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// Check if endpoint has a pending interrupt
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if eptInts&(1<<i) > 0 {
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// yes, so handle flags
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epFlags := getEPINTFLAG(i)
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setEPINTFLAG(i, epFlags)
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// Endpoint Transfer Complete Interrupt
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if (epFlags & sam.USB_DEVICE_EPINTFLAG_TRCPT0) > 0 {
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handleEndpoint(i)
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}
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}
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}
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}
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func initEndpoint(ep, config uint32) {
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switch config {
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case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointIn:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE |=
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sam.RegValue(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep])))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_INTERRUPT+1)<<sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
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case usb_ENDPOINT_TYPE_BULK | usbEndpointOut:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE |=
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sam.RegValue(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep])))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_BULK+1)<<sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
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// ack the current transfer
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setEPINTENSET(ep, sam.USB_DEVICE_EPINTENSET_TRCPT0)
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// ready for next transfer
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setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
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case usb_ENDPOINT_TYPE_INTERRUPT | usbEndpointOut:
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// TODO: not really anything, seems like...
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case usb_ENDPOINT_TYPE_BULK | usbEndpointIn:
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE |=
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sam.RegValue(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep])))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_BULK+1)<<sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
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// NAK on endpoint IN, the bank is not yet filled in.
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setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK1RDY)
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case usb_ENDPOINT_TYPE_CONTROL:
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// Control OUT
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE |=
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sam.RegValue(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep])))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE0_Pos))
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// Control IN
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// set packet size
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usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE |=
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sam.RegValue(epPacketSize(64) << usb_DEVICE_PCKSIZE_SIZE_Pos)
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// set data buffer address
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usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR =
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sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep])))
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// set endpoint type
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setEPCFG(ep, getEPCFG(ep)|((usb_ENDPOINT_TYPE_CONTROL+1)<<sam.USB_DEVICE_EPCFG_EPTYPE1_Pos))
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// Prepare OUT endpoint for receive
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// set multi packet size for expected number of receive bytes on control OUT
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE |=
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sam.RegValue(64 << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
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// set byte count to zero, we have not received anything yet
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usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE &^=
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sam.RegValue(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
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// NAK on endpoint OUT to show we are ready to receive control data
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setEPSTATUSSET(ep, sam.USB_DEVICE_EPSTATUSSET_BK0RDY)
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}
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}
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func handleStandardSetup(setup usbSetup) bool {
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switch setup.bRequest {
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case usb_GET_STATUS:
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buf := []byte{0, 0}
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if setup.bmRequestType != 0 { // endpoint
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// TODO: actually check if the endpoint in question is currently halted
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if isEndpointHalt {
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buf[0] = 1
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}
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}
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sendUSBPacket(0, buf)
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return true
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case usb_CLEAR_FEATURE:
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if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
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isRemoteWakeUpEnabled = false
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} else if setup.wValueL == 0 { // ENDPOINTHALT
|
||||
isEndpointHalt = false
|
||||
}
|
||||
sendZlp(0)
|
||||
return true
|
||||
|
||||
case usb_SET_FEATURE:
|
||||
if setup.wValueL == 1 { // DEVICEREMOTEWAKEUP
|
||||
isRemoteWakeUpEnabled = true
|
||||
} else if setup.wValueL == 0 { // ENDPOINTHALT
|
||||
isEndpointHalt = true
|
||||
}
|
||||
sendZlp(0)
|
||||
return true
|
||||
|
||||
case usb_SET_ADDRESS:
|
||||
// set packet size 64 with auto Zlp after transfer
|
||||
usbEndpointDescriptors[0].DeviceDescBank[1].PCKSIZE =
|
||||
sam.RegValue(epPacketSize(64)<<usb_DEVICE_PCKSIZE_SIZE_Pos) |
|
||||
sam.RegValue(1<<31) // autozlp
|
||||
|
||||
// ack the transfer is complete from the request
|
||||
setEPINTFLAG(0, sam.USB_DEVICE_EPINTFLAG_TRCPT1)
|
||||
|
||||
// set bank ready for data
|
||||
setEPSTATUSSET(0, sam.USB_DEVICE_EPSTATUSSET_BK1RDY)
|
||||
|
||||
// wait for transfer to complete
|
||||
for (getEPINTFLAG(0) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) == 0 {
|
||||
}
|
||||
|
||||
// last, set the device address to that requested by host
|
||||
sam.USB_DEVICE.DADD |= sam.RegValue8(setup.wValueL)
|
||||
sam.USB_DEVICE.DADD |= sam.USB_DEVICE_DADD_ADDEN
|
||||
|
||||
return true
|
||||
|
||||
case usb_GET_DESCRIPTOR:
|
||||
sendDescriptor(setup)
|
||||
return true
|
||||
|
||||
case usb_SET_DESCRIPTOR:
|
||||
return false
|
||||
|
||||
case usb_GET_CONFIGURATION:
|
||||
buff := []byte{usbConfiguration}
|
||||
sendUSBPacket(0, buff)
|
||||
return true
|
||||
|
||||
case usb_SET_CONFIGURATION:
|
||||
if setup.bmRequestType&usb_REQUEST_RECIPIENT == usb_REQUEST_DEVICE {
|
||||
for i := 1; i < len(endPoints); i++ {
|
||||
initEndpoint(uint32(i), endPoints[i])
|
||||
}
|
||||
|
||||
usbConfiguration = setup.wValueL
|
||||
|
||||
// Enable interrupt for CDC control messages from host (OUT packet)
|
||||
setEPINTENSET(usb_CDC_ENDPOINT_ACM, sam.USB_DEVICE_EPINTENSET_TRCPT1)
|
||||
|
||||
// Enable interrupt for CDC data messages from host
|
||||
setEPINTENSET(usb_CDC_ENDPOINT_OUT, sam.USB_DEVICE_EPINTENSET_TRCPT0)
|
||||
|
||||
sendZlp(0)
|
||||
return true
|
||||
} else {
|
||||
return false
|
||||
}
|
||||
|
||||
case usb_GET_INTERFACE:
|
||||
buff := []byte{usbSetInterface}
|
||||
sendUSBPacket(0, buff)
|
||||
return true
|
||||
|
||||
case usb_SET_INTERFACE:
|
||||
usbSetInterface = setup.wValueL
|
||||
|
||||
sendZlp(0)
|
||||
return true
|
||||
|
||||
default:
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
func cdcSetup(setup usbSetup) bool {
|
||||
if setup.bmRequestType == usb_REQUEST_DEVICETOHOST_CLASS_INTERFACE {
|
||||
if setup.bRequest == usb_CDC_GET_LINE_CODING {
|
||||
buf := bytes.NewBuffer(make([]byte, 0, 7))
|
||||
binary.Write(buf, binary.LittleEndian, usbLineInfo.dwDTERate)
|
||||
binary.Write(buf, binary.LittleEndian, usbLineInfo.bCharFormat)
|
||||
binary.Write(buf, binary.LittleEndian, usbLineInfo.bParityType)
|
||||
binary.Write(buf, binary.LittleEndian, usbLineInfo.bDataBits)
|
||||
|
||||
sendUSBPacket(0, buf.Bytes())
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
if setup.bmRequestType == usb_REQUEST_HOSTTODEVICE_CLASS_INTERFACE {
|
||||
if setup.bRequest == usb_CDC_SET_LINE_CODING {
|
||||
buf := bytes.NewBuffer(receiveUSBControlPacket())
|
||||
binary.Read(buf, binary.LittleEndian, &(usbLineInfo.dwDTERate))
|
||||
binary.Read(buf, binary.LittleEndian, &(usbLineInfo.bCharFormat))
|
||||
binary.Read(buf, binary.LittleEndian, &(usbLineInfo.bParityType))
|
||||
binary.Read(buf, binary.LittleEndian, &(usbLineInfo.bDataBits))
|
||||
}
|
||||
|
||||
if setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
|
||||
usbLineInfo.lineState = setup.wValueL
|
||||
}
|
||||
|
||||
if setup.bRequest == usb_CDC_SET_LINE_CODING || setup.bRequest == usb_CDC_SET_CONTROL_LINE_STATE {
|
||||
// auto-reset into the bootloader
|
||||
if usbLineInfo.dwDTERate == 1200 && (usbLineInfo.lineState&0x01) == 0 {
|
||||
// TODO: system reset
|
||||
} else {
|
||||
// TODO: cancel any reset
|
||||
}
|
||||
}
|
||||
|
||||
if setup.bRequest == usb_CDC_SEND_BREAK {
|
||||
// TODO: something with this value?
|
||||
// breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL;
|
||||
// return false;
|
||||
}
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func sendUSBPacket(ep uint32, data []byte) {
|
||||
copy(udd_ep_in_cache_buffer[ep][:], data)
|
||||
|
||||
// Set endpoint address for sending data
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[1].ADDR =
|
||||
sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_in_cache_buffer[ep])))
|
||||
|
||||
// clear multi-packet size which is total bytes already sent
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE &^=
|
||||
sam.RegValue(usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Mask << usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos)
|
||||
|
||||
// set byte count, which is total number of bytes to be sent
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE |=
|
||||
sam.RegValue((len(data) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask) << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
|
||||
}
|
||||
|
||||
func receiveUSBControlPacket() []byte {
|
||||
// set ready to receive data
|
||||
setEPSTATUSCLR(0, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
|
||||
|
||||
// read the data
|
||||
bytesread := armRecvCtrlOUT(0)
|
||||
|
||||
// return the data
|
||||
data := make([]byte, 0, bytesread)
|
||||
copy(data, udd_ep_out_cache_buffer[0][:bytesread])
|
||||
return data
|
||||
}
|
||||
|
||||
func armRecvCtrlOUT(ep uint32) uint32 {
|
||||
// Set output address to receive data
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[0].ADDR =
|
||||
sam.RegValue(uintptr(unsafe.Pointer(&udd_ep_out_cache_buffer[ep])))
|
||||
|
||||
// set multi-packet size which is total expected number of bytes to receive.
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE |=
|
||||
sam.RegValue(8<<usb_DEVICE_PCKSIZE_MULTI_PACKET_SIZE_Pos) |
|
||||
sam.RegValue(epPacketSize(64)<<usb_DEVICE_PCKSIZE_SIZE_Pos)
|
||||
|
||||
// clear byte count of bytes received so far.
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE &^=
|
||||
sam.RegValue(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
|
||||
|
||||
// clear ready state to start transfer
|
||||
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
|
||||
|
||||
// Wait until OUT transfer is ready.
|
||||
for (getEPSTATUS(ep) & sam.USB_DEVICE_EPSTATUS_BK0RDY) == 0 {
|
||||
}
|
||||
|
||||
// Wait until OUT transfer is completed.
|
||||
for (getEPINTFLAG(ep) & sam.USB_DEVICE_EPINTFLAG_TRCPT0) == 0 {
|
||||
}
|
||||
|
||||
// return number of bytes received
|
||||
return uint32((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE >>
|
||||
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
|
||||
}
|
||||
|
||||
// sendDescriptor creates and sends the various USB descriptor types that
|
||||
// can be requested by the host.
|
||||
func sendDescriptor(setup usbSetup) {
|
||||
switch setup.wValueH {
|
||||
case usb_CONFIGURATION_DESCRIPTOR_TYPE:
|
||||
sendConfiguration(setup)
|
||||
return
|
||||
case usb_DEVICE_DESCRIPTOR_TYPE:
|
||||
if setup.wLength == 8 {
|
||||
// composite descriptor requested, so only send 8 bytes
|
||||
dd := NewDeviceDescriptor(0xEF, 0x02, 0x01, 64, usb_VID, usb_PID, 0x100, usb_IMANUFACTURER, usb_IPRODUCT, usb_ISERIAL, 1)
|
||||
sendUSBPacket(0, dd.Bytes()[:8])
|
||||
} else {
|
||||
// complete descriptor requested so send entire packet
|
||||
dd := NewDeviceDescriptor(0x00, 0x00, 0x00, 64, usb_VID, usb_PID, 0x100, usb_IMANUFACTURER, usb_IPRODUCT, usb_ISERIAL, 1)
|
||||
sendUSBPacket(0, dd.Bytes())
|
||||
}
|
||||
return
|
||||
|
||||
case usb_STRING_DESCRIPTOR_TYPE:
|
||||
switch setup.wValueL {
|
||||
case 0:
|
||||
b := make([]byte, 4)
|
||||
b[0] = byte(usb_STRING_LANGUAGE[0] >> 8)
|
||||
b[1] = byte(usb_STRING_LANGUAGE[0] & 0xff)
|
||||
b[2] = byte(usb_STRING_LANGUAGE[1] >> 8)
|
||||
b[3] = byte(usb_STRING_LANGUAGE[1] & 0xff)
|
||||
sendUSBPacket(0, b)
|
||||
|
||||
case usb_IPRODUCT:
|
||||
prod := []byte(usb_STRING_PRODUCT)
|
||||
b := make([]byte, len(prod)*2+2)
|
||||
b[0] = byte(len(prod)*2 + 2)
|
||||
b[1] = 0x03
|
||||
|
||||
for i, val := range prod {
|
||||
b[i*2] = 0
|
||||
b[i*2+1] = val
|
||||
}
|
||||
|
||||
sendUSBPacket(0, b)
|
||||
|
||||
case usb_IMANUFACTURER:
|
||||
prod := []byte(usb_STRING_MANUFACTURER)
|
||||
b := make([]byte, len(prod)*2+2)
|
||||
b[0] = byte(len(prod)*2 + 2)
|
||||
b[1] = 0x03
|
||||
|
||||
for i, val := range prod {
|
||||
b[i*2] = 0
|
||||
b[i*2+1] = val
|
||||
}
|
||||
|
||||
sendUSBPacket(0, b)
|
||||
|
||||
case usb_ISERIAL:
|
||||
// TODO: allow returning a product serial number
|
||||
sendZlp(0)
|
||||
}
|
||||
|
||||
// send final zero length packet and return
|
||||
sendZlp(0)
|
||||
return
|
||||
}
|
||||
|
||||
// do not know how to handle this message, so return zero
|
||||
sendZlp(0)
|
||||
return
|
||||
}
|
||||
|
||||
// sendConfiguration creates and sends the configuration packet to the host.
|
||||
func sendConfiguration(setup usbSetup) {
|
||||
if setup.wLength == 9 {
|
||||
sz := uint16(configDescriptorSize + cdcSize)
|
||||
config := NewConfigDescriptor(sz, 2)
|
||||
sendUSBPacket(0, config.Bytes())
|
||||
} else {
|
||||
iad := NewIADDescriptor(0, 2, usb_CDC_COMMUNICATION_INTERFACE_CLASS, usb_CDC_ABSTRACT_CONTROL_MODEL, 0)
|
||||
|
||||
cif := NewInterfaceDescriptor(usb_CDC_ACM_INTERFACE, 1, usb_CDC_COMMUNICATION_INTERFACE_CLASS, usb_CDC_ABSTRACT_CONTROL_MODEL, 0)
|
||||
|
||||
header := NewCDCCSInterfaceDescriptor(usb_CDC_HEADER, usb_CDC_V1_10&0xFF, (usb_CDC_V1_10>>8)&0x0FF)
|
||||
|
||||
controlManagement := NewACMFunctionalDescriptor(usb_CDC_ABSTRACT_CONTROL_MANAGEMENT, 6)
|
||||
|
||||
functionalDescriptor := NewCDCCSInterfaceDescriptor(usb_CDC_UNION, usb_CDC_ACM_INTERFACE, usb_CDC_DATA_INTERFACE)
|
||||
|
||||
callManagement := NewCMFunctionalDescriptor(usb_CDC_CALL_MANAGEMENT, 1, 1)
|
||||
|
||||
cifin := NewEndpointDescriptor((usb_CDC_ENDPOINT_ACM | usbEndpointIn), usb_ENDPOINT_TYPE_INTERRUPT, 0x10, 0x10)
|
||||
|
||||
dif := NewInterfaceDescriptor(usb_CDC_DATA_INTERFACE, 2, usb_CDC_DATA_INTERFACE_CLASS, 0, 0)
|
||||
|
||||
in := NewEndpointDescriptor((usb_CDC_ENDPOINT_OUT | usbEndpointOut), usb_ENDPOINT_TYPE_BULK, usbEndpointPacketSize, 0)
|
||||
|
||||
out := NewEndpointDescriptor((usb_CDC_ENDPOINT_IN | usbEndpointIn), usb_ENDPOINT_TYPE_BULK, usbEndpointPacketSize, 0)
|
||||
|
||||
cdc := NewCDCDescriptor(iad,
|
||||
cif,
|
||||
header,
|
||||
controlManagement,
|
||||
functionalDescriptor,
|
||||
callManagement,
|
||||
cifin,
|
||||
dif,
|
||||
in,
|
||||
out)
|
||||
|
||||
sz := uint16(configDescriptorSize + cdcSize)
|
||||
config := NewConfigDescriptor(sz, 2)
|
||||
|
||||
buf := make([]byte, 0, sz)
|
||||
buf = append(buf, config.Bytes()...)
|
||||
buf = append(buf, cdc.Bytes()...)
|
||||
|
||||
sendUSBPacket(0, buf)
|
||||
}
|
||||
}
|
||||
|
||||
func handleEndpoint(ep uint32) {
|
||||
// get data
|
||||
count := int((usbEndpointDescriptors[ep].DeviceDescBank[0].PCKSIZE >>
|
||||
usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos) & usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask)
|
||||
|
||||
// move to ring buffer
|
||||
for i := 0; i < count; i++ {
|
||||
UART0.Receive(byte((udd_ep_out_cache_buffer[ep][i] & 0xFF)))
|
||||
}
|
||||
|
||||
// set ready for next data
|
||||
setEPSTATUSCLR(ep, sam.USB_DEVICE_EPSTATUSCLR_BK0RDY)
|
||||
|
||||
}
|
||||
|
||||
func sendZlp(ep uint32) {
|
||||
usbEndpointDescriptors[ep].DeviceDescBank[1].PCKSIZE &^=
|
||||
sam.RegValue(usb_DEVICE_PCKSIZE_BYTE_COUNT_Mask << usb_DEVICE_PCKSIZE_BYTE_COUNT_Pos)
|
||||
}
|
||||
|
||||
func epPacketSize(size uint16) uint32 {
|
||||
switch size {
|
||||
case 8:
|
||||
return 0
|
||||
case 16:
|
||||
return 1
|
||||
case 32:
|
||||
return 2
|
||||
case 64:
|
||||
return 3
|
||||
case 128:
|
||||
return 4
|
||||
case 256:
|
||||
return 5
|
||||
case 512:
|
||||
return 6
|
||||
case 1023:
|
||||
return 7
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
func getEPCFG(ep uint32) sam.RegValue8 {
|
||||
switch ep {
|
||||
case 0:
|
||||
return sam.USB_DEVICE.EPCFG0
|
||||
case 1:
|
||||
return sam.USB_DEVICE.EPCFG1
|
||||
case 2:
|
||||
return sam.USB_DEVICE.EPCFG2
|
||||
case 3:
|
||||
return sam.USB_DEVICE.EPCFG3
|
||||
case 4:
|
||||
return sam.USB_DEVICE.EPCFG4
|
||||
case 5:
|
||||
return sam.USB_DEVICE.EPCFG5
|
||||
case 6:
|
||||
return sam.USB_DEVICE.EPCFG6
|
||||
case 7:
|
||||
return sam.USB_DEVICE.EPCFG7
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
func setEPCFG(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPCFG0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPCFG1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPCFG2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPCFG3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPCFG4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPCFG5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPCFG6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPCFG7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func setEPSTATUSCLR(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPSTATUSCLR0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPSTATUSCLR1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPSTATUSCLR2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPSTATUSCLR3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPSTATUSCLR4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPSTATUSCLR5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPSTATUSCLR6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPSTATUSCLR7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func setEPSTATUSSET(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPSTATUSSET0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPSTATUSSET1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPSTATUSSET2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPSTATUSSET3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPSTATUSSET4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPSTATUSSET5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPSTATUSSET6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPSTATUSSET7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func getEPSTATUS(ep uint32) sam.RegValue8 {
|
||||
switch ep {
|
||||
case 0:
|
||||
return sam.USB_DEVICE.EPSTATUS0
|
||||
case 1:
|
||||
return sam.USB_DEVICE.EPSTATUS1
|
||||
case 2:
|
||||
return sam.USB_DEVICE.EPSTATUS2
|
||||
case 3:
|
||||
return sam.USB_DEVICE.EPSTATUS3
|
||||
case 4:
|
||||
return sam.USB_DEVICE.EPSTATUS4
|
||||
case 5:
|
||||
return sam.USB_DEVICE.EPSTATUS5
|
||||
case 6:
|
||||
return sam.USB_DEVICE.EPSTATUS6
|
||||
case 7:
|
||||
return sam.USB_DEVICE.EPSTATUS7
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
func getEPINTFLAG(ep uint32) sam.RegValue8 {
|
||||
switch ep {
|
||||
case 0:
|
||||
return sam.USB_DEVICE.EPINTFLAG0
|
||||
case 1:
|
||||
return sam.USB_DEVICE.EPINTFLAG1
|
||||
case 2:
|
||||
return sam.USB_DEVICE.EPINTFLAG2
|
||||
case 3:
|
||||
return sam.USB_DEVICE.EPINTFLAG3
|
||||
case 4:
|
||||
return sam.USB_DEVICE.EPINTFLAG4
|
||||
case 5:
|
||||
return sam.USB_DEVICE.EPINTFLAG5
|
||||
case 6:
|
||||
return sam.USB_DEVICE.EPINTFLAG6
|
||||
case 7:
|
||||
return sam.USB_DEVICE.EPINTFLAG7
|
||||
default:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
func setEPINTFLAG(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPINTFLAG0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPINTFLAG1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPINTFLAG2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPINTFLAG3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPINTFLAG4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPINTFLAG5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPINTFLAG6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPINTFLAG7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func setEPINTENCLR(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPINTENCLR0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPINTENCLR1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPINTENCLR2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPINTENCLR3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPINTENCLR4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPINTENCLR5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPINTENCLR6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPINTENCLR7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func setEPINTENSET(ep uint32, val sam.RegValue8) {
|
||||
switch ep {
|
||||
case 0:
|
||||
sam.USB_DEVICE.EPINTENSET0 = val
|
||||
case 1:
|
||||
sam.USB_DEVICE.EPINTENSET1 = val
|
||||
case 2:
|
||||
sam.USB_DEVICE.EPINTENSET2 = val
|
||||
case 3:
|
||||
sam.USB_DEVICE.EPINTENSET3 = val
|
||||
case 4:
|
||||
sam.USB_DEVICE.EPINTENSET4 = val
|
||||
case 5:
|
||||
sam.USB_DEVICE.EPINTENSET5 = val
|
||||
case 6:
|
||||
sam.USB_DEVICE.EPINTENSET6 = val
|
||||
case 7:
|
||||
sam.USB_DEVICE.EPINTENSET7 = val
|
||||
default:
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user