I have to develop an application to communicate with a C8051F340-TB board from Silicon Labs through USB (just to be clear, I am using the P3 connector from fig. 4 of previous link, not the USB Debug Adapter from fig. 1). I have flashed the device with an example program that is supposed to echo the received data through the USB. However I cannot try it because I cannot figure out how to send data to a USB device. It is the first time I am working with a USB device at low level.
I am in Xubuntu 18.04 and the
lsusb -v command says, among other things, this:
Bus 001 Device 023: ID 10c4:ea61 Cygnal Integrated Products, Inc. CP210x UART Bridge Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x10c4 Cygnal Integrated Products, Inc. idProduct 0xea61 CP210x UART Bridge bcdDevice 1.00 iManufacturer 1 Myself iProduct 2 USB communication test iSerial 3 0001 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 64mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 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 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Device Status: 0x0000 (Bus Powered)
which seems to be my device (I recognized the "iManufacturer" and "iProduct" fields).
How can I send a byte, or a string, or something to the device? Also, how can I read the data it sends to me?