我知道有很多关于状态打印机的问题......
我有一个 Citizen CT-S310 II,我已经管理了所有用于在 USB 中写入字符的代码,而 libusb_bulk_transfer(文本、粗体、中心、CR、CUT_PAPER 等)没有问题:
#define ENDPOINT_OUT 0x02
#define ENDPOINT_IN 0x81
struct libusb_device_handle *_handle;
[detach kernel driver...]
[claim interface...]
[etc ...]
r = libusb_bulk_transfer(device_handle, ENDPOINT_OUT, Mydata, out_len, &transferred, 1000);
现在,我需要从打印机接收数据以检查状态,我的第一个想法是发送具有与文档相同的“bulk_transfer”的 POS 命令:
1D (hexa) 72 (hexa) n n => 1 (发送纸传感器状态)
并通过“bulk_transfer”以端点“ENDPOINT_IN”检索值,文档说有 8 个字节要接收:
bit 0,1 => paper found by paper near-end sensor 00H
bit 0,1 => paper not found by paper near-end sensor 03H
bit 1,2 => paper found by paper-end sensor 00H
bit 1,2 => paper not found by paper-end sensor 0CH
[...]
所以两个“bulk_transfer”,一个用于发送命令状态(ENDPOINT_OUT),一个用于接收结果(ENDPOINT_IN),但我总是有一个 USB 错误(读取中的“bulk_transfer”= -1)
也许USB不能这样工作?所以我的第二个想法是使用 PrinterClass USB 中实现的功能,命令为“control_transfer”:
int r = 0;
int out_len = 1;
unsigned char* _udata = NULL;
uint8_t bmRequestType = LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE;
uint8_t bRequest = LIBUSB_REQUEST_GET_STATUS;
uint16_t wValue = 0; // the value field for the setup packet (?????)
uint16_t wIndex = 0; // N° interface printer (the index field for the setup packet)
r = libusb_control_transfer(device_handle, bmRequestType,bRequest,wValue, wIndex,_udata,out_len, USB_TIMEOUT);
我不知道如何填写所有参数,我知道这取决于我的设备,但 libsub 的文档不是很明确。
究竟什么是“wValue”?
究竟什么是“wIndex”?接口号??
LIBUSB_ENDPOINT_IN 参数默认为 0x80,但我的打印机使用 0x81,我必须更改此默认端点吗?
Bus 001 Device 004: ID 1d90:2060
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1d90
idProduct 0x2060
bcdDevice 0.02
iManufacturer 1 CITIZEN
iProduct 2 Thermal Printer
iSerial 3 00000000
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 7 Printer
bInterfaceSubClass 1 Printer
bInterfaceProtocol 2 Bidirectional
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0001
Self Powered
在我的情况下,“control_transfer”的响应始终为 0 :( 有纸或无纸。如何发送一个好的“control_transfer”来请求我的打印机的状态??
欢迎所有帮助解决我的问题!