int netmd_send_message(netmd_dev_handle *devh, unsigned char *cmd,
const size_t cmdlen)
{
unsigned char pollbuf[4];
int len;
libusb_device_handle *dev;
dev = (libusb_device_handle *)devh;
/* poll to see if we can send data */
len = netmd_poll(dev, pollbuf, 1);
if (len != 0) {
netmd_log(NETMD_LOG_ERROR, "netmd_exch_message: netmd_poll failed\n");
return (len > 0) ? NETMDERR_NOTREADY : len;
}
/* send data */
netmd_log(NETMD_LOG_DEBUG, "Command:\n");
netmd_log_hex(NETMD_LOG_DEBUG, cmd, cmdlen);
if (libusb_control_transfer(dev, LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_RECIPIENT_INTERFACE, 0x80, 0, 0, cmd, (int)cmdlen,
NETMD_SEND_TIMEOUT) < 0) {
netmd_log(NETMD_LOG_ERROR, "netmd_exch_message: libusb_control_transfer failed\n");
return NETMDERR_USB;
}
return 0;
}
int netmd_recv_message(netmd_dev_handle *devh, unsigned char* rsp)
{
int len;
unsigned char pollbuf[4];
libusb_device_handle *dev;
dev = (libusb_device_handle *)devh;
/* poll for data that minidisc wants to send */
len = netmd_poll(dev, pollbuf, NETMD_RECV_TRIES);
if (len <= 0) {
netmd_log(NETMD_LOG_ERROR, "netmd_exch_message: netmd_poll failed\n");
return (len == 0) ? NETMDERR_TIMEOUT : len;
}
/* receive data */
if (libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_RECIPIENT_INTERFACE, pollbuf[1], 0, 0, rsp, len,
NETMD_RECV_TIMEOUT) < 0) {
netmd_log(NETMD_LOG_ERROR, "netmd_exch_message: libusb_control_transfer failed\n");
return NETMDERR_USB;
}
netmd_log(NETMD_LOG_DEBUG, "Response:\n");
netmd_log_hex(NETMD_LOG_DEBUG, rsp, (size_t)len);
/* return length */
return len;
}
/*
exchanges a message with the minidisc
IN dev USB device handle
buf pointer to buffer to send
len length of data to send
Returns >0 on success, <0 on failure
*/
int netmd_exch_message(usb_dev_handle *dev, unsigned char *cmd, int cmdlen,
unsigned char *rsp)
{
unsigned char pollbuf[4];
int len;
/* poll to see if we can send data */
len = netmd_poll(dev, pollbuf, 1);
if (len != 0) {
fprintf(stderr, "netmd_exch_message: netmd_poll failed\n");
return (len > 0) ? NETMDERR_NOTREADY : len;
}
/* send data */
if (usb_control_msg(dev, USB_ENDPOINT_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, 0x80, 0, 0, (char*)cmd, cmdlen,
NETMD_SEND_TIMEOUT) < 0) {
fprintf(stderr, "netmd_exch_message: usb_control_msg failed\n");
return NETMDERR_USB;
}
do {
/* poll for data that minidisc wants to send */
len = netmd_poll(dev, pollbuf, NETMD_RECV_TRIES);
if (len <= 0) {
fprintf(stderr, "netmd_exch_message: netmd_poll failed\n");
return (len == 0) ? NETMDERR_TIMEOUT : len;
}
/* receive data */
if (usb_control_msg(dev, USB_ENDPOINT_IN | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, pollbuf[1], 0, 0, (char*)rsp, len,
NETMD_RECV_TIMEOUT) < 0) {
fprintf(stderr, "netmd_exch_message: usb_control_msg failed\n");
return NETMDERR_USB;
}
/* get response again if player responds with 0x0F. */
} while (rsp[0] == 0x0F);
/* return length */
return len;
}
