Hi,
# General INFO:
I made a custom USB Host Driver for Printer class using STM32F407 - Discovery Board. For This I use HAL Library. I knew that many people don't like this HAL library. I may understand if you guide me through bare-metal programming.
When I connect my printer(Honeywell) to my USB Host. I am successfully able to connect , enumerate and able to send/receive class specific request. Even when I send data to my printer using send bulk data API. I get print also. But This happen only once. Next time If I tried to send data It goes.but do not print anything.
Now you may ask how can I know that data is reaching to printer? I know because Printer indicates by bilking its LED.
# Problem :
@1: I want to know that Is there any command which specify to printer that my data has finish. Now printer can print.
@2: As far as I know. Printer has buffer So that It can store receive data. and Later it print using this buffer. Now my Question is that Can I empty this buffer by sending any command to my printer?
@3: After sending data to printer. How will I know that printer has received data successfully?
To know this I am polling USBH_LL_GetURBState(phost, PRT_Handle->OutPipe) == USBH_URB_DONE). Am I doing right or any other thing I should consider?
@4: When I send GET_PORT_STATUS(class specific) request to my printer. It returns 4 Bytes data. but USB specification mention only 1 Byte. Am I missing anything?
Thanks
#USB
