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device_linux.go
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device_linux.go
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package ftn
/*
#include <stdlib.h>
#include <libusb-1.0/libusb.h>
#cgo pkg-config: libusb-1.0
*/
import "C"
import (
"bytes"
"runtime"
"unsafe"
)
var ctx *C.libusb_context
type USBError int
func (e USBError) Error() string {
return C.GoString(C.libusb_error_name(C.int(e)))
}
func init() {
if e := C.libusb_init(&ctx); e < 0 {
panic(USBError(e))
}
}
// Device represents some FTDI device
type Device struct {
d *C.libusb_device
desc C.struct_libusb_device_descriptor
}
func (d *Device) unref() {
C.libusb_unref_device(d.d)
}
func (d *Device) Connect() (*Conn, error) {
var h *C.libusb_device_handle
if e := C.libusb_open(d.d, &h); e < 0 {
return nil, USBError(e)
}
return &Conn{h: h, d: d}, nil
}
func FindDevices(vendor, product int) ([]*Device, error) {
var dl **C.libusb_device
n := C.libusb_get_device_list(ctx, &dl)
if n < 0 {
return nil, USBError(n)
}
defer C.libusb_free_device_list(dl, 1)
var found []*Device
for _, d := range (*(*[1 << 30]*C.libusb_device)(unsafe.Pointer(dl)))[:n] {
var desc C.struct_libusb_device_descriptor
if e := C.libusb_get_device_descriptor(d, &desc); e < 0 {
return nil, USBError(e)
}
if int(desc.idVendor) == vendor && int(desc.idProduct) == product {
dev := &Device{d: C.libusb_ref_device(d), desc: desc}
runtime.SetFinalizer(dev, (*Device).unref)
found = append(found, dev)
}
}
return found, nil
}
type Conn struct {
h *C.libusb_device_handle
d *Device
}
func bytes0str(b []byte) string {
if i := bytes.IndexByte(b, 0); i != -1 {
b = b[:i]
}
return string(b)
}
func (c *Conn) Description() (string, error) {
buf := make([]byte, 256)
e := C.libusb_get_string_descriptor_ascii(
c.h, c.d.desc.iProduct, (*C.uchar)(&buf[0]), C.int(len(buf)),
)
if e < 0 {
return "", USBError(e)
}
return bytes0str(buf), nil
}
func (c *Conn) Serial() (string, error) {
buf := make([]byte, 256)
e := C.libusb_get_string_descriptor_ascii(
c.h, c.d.desc.iSerialNumber, (*C.uchar)(&buf[0]), C.int(len(buf)),
)
if e < 0 {
return "", USBError(e)
}
return bytes0str(buf), nil
}
/*type Mode byte
const (
ModeReset Mode = iota
ModeBitbang
ModeMPSSE
ModeSyncBB
ModeMCU
ModeOpto
ModeCBUS
ModeSyncFF
ModeFT1284
)
func (d *Device) SetBitmode(iomask byte, mode Mode) error {
e := C.ftdi_set_bitmode(d.ctx, C.uchar(iomask), C.uchar(mode))
return d.makeError(e)
}
func (d *Device) Reset() error {
return d.makeError(C.ftdi_usb_reset(d.ctx))
}
func (d *Device) PurgeRxBuffer() error {
return d.makeError(C.ftdi_usb_purge_rx_buffer(d.ctx))
}
func (d *Device) PurgeTxBuffer() error {
return d.makeError(C.ftdi_usb_purge_tx_buffer(d.ctx))
}
func (d *Device) PurgeBuffers() error {
return d.makeError(C.ftdi_usb_purge_buffers(d.ctx))
}
func (d *Device) WriteChunkSize() (int, error) {
var cs C.uint
e := C.ftdi_write_data_get_chunksize(d.ctx, &cs)
return int(cs), d.makeError(e)
}
func (d *Device) SetWriteChunkSize(cs int) error {
return d.makeError(C.ftdi_write_data_set_chunksize(d.ctx, C.uint(cs)))
}
func (d *Device) Write(buf []byte) (int, error) {
n := C.ftdi_write_data(
d.ctx,
(*C.uchar)(unsafe.Pointer(&buf[0])),
C.int(len(buf)),
)
if n < 0 {
return 0, d.makeError(n)
}
return int(n), nil
}
func (d *Device) WriteByte(b byte) error {
n := C.ftdi_write_data(d.ctx, (*C.uchar)(&b), 1)
if n != 1 {
return d.makeError(n)
}
return nil
}
func (d *Device) SetBaudrate(br int) error {
return d.makeError(C.ftdi_set_baudrate(d.ctx, C.int(br)))
}
// EEPROM returns a handler to the device internal EEPROM subsystem
func (d *Device) EEPROM() EEPROM {
return EEPROM{d}
}*/