int usbAInScanRead_USB1608FS_Plus(libusb_device_handle *udev, int nScan, int nChan, uint16_t *data, uint8_t options)
{
int i;
int ret = -1;
int nbytes = nChan*nScan*2; // number of bytes to read in 64 bit chunks
int transferred;
uint16_t status = 0;
char value[MAX_PACKET_SIZE];
if (options & IMMEDIATE_TRANSFER_MODE) {
for (i = 0; i < nbytes/2; i++) {
ret = libusb_bulk_transfer(udev, LIBUSB_ENDPOINT_IN|1, (unsigned char *) &data[i], 2, &transferred, 2000);
if (ret < 0) {
perror("usbAInScanRead_USB1608FS_Plus: error in usb_bulk_transfer.");
}
if (transferred != 2) {
fprintf(stderr, "usbAInScanRead_USB1608_Plus: number of bytes transferred = %d, nbytes = %d\n", transferred, nbytes);
}
}
} else {
ret = libusb_bulk_transfer(udev, LIBUSB_ENDPOINT_IN|1, (unsigned char *) data, nbytes, &transferred, HS_DELAY);
if (ret < 0) {
perror("usbAInScanRead_USB1608FS_Plus: error in usb_bulk_transfer.");
}
if (transferred != nbytes) {
fprintf(stderr, "usbAInScanRead_USB1608_Plus: number of bytes transferred = %d, nbytes = %d\n", transferred, nbytes);
}
}
status = usbStatus_USB1608FS_Plus(udev);
// if nbytes is a multiple of wMaxPacketSize the device will send a zero byte packet.
if ((nbytes%wMaxPacketSize) == 0 && !(status & AIN_SCAN_RUNNING)) {
libusb_bulk_transfer(udev, LIBUSB_ENDPOINT_IN|1, (unsigned char *) value, 2, &ret, 100);
}
if ((status & AIN_SCAN_OVERRUN)) {
printf("Analog AIn scan overrun.\n");
usbAInScanStop_USB1608FS_Plus(udev);
usbAInScanClearFIFO_USB1608FS_Plus(udev);
}
return nbytes;
}
int usbAInScanRead_USB1608FS_Plus(usb_dev_handle *udev, int nScan, int nChan, __u16 *data)
{
int ret = -1;
int nbytes = nChan*nScan*2; // number of bytes to read in 64 bit chunks
__u16 status;
ret = usb_bulk_read(udev, USB_ENDPOINT_IN|1, (char *) data, nbytes, HS_DELAY);
if (ret != nbytes) {
printf("usbAInScanRead_USB1608FS_Plus: error in usb_bulk_read. ret = %d\n", ret);
}
status = usbStatus_USB1608FS_Plus(udev);
if (status & AIN_SCAN_RUNNING) {
printf("Analog In scan not done.\n");
usbAInScanStop_USB1608FS_Plus(udev);
}
if ((status & AIN_SCAN_OVERRUN)) {
printf("Analog AIn scan overrun.\n");
}
return ret;
}