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Zephyr project on STM32

   Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
  • Install host dependencies.
  • Import toolchain and SDK.
  • Create, configure, build and manage apps.
  • Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench

System Workbench for STM32

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Need help on STM32F407xx USB HOST Printer class stack for USB POS printer.

Posted by Delhiganesh on 2018-04-03 16:30

Hi,
I need help on STM32F4 micro controller. I need to interface USB POS printer with micro controller. I have done little bit working in USB HOST FS/HS Host programming. But i dont know how to write stack for USB host class for Barcode scanner and printer.

Thanks in advance.

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Posted by Joe_Meso on 2018-08-31 18:57

The simplest approach is to use the USB Host CDC example for the STMCube. This is the serial communications host application. You can set dummy baud rate settings which would not apply, and instead of your data connecting to an upstream serial port, just connect the data buffers to your MCU application.

When the printer is plugged in, wait for USBH_Get_App_State to equal APPLICATION_READY, and then just use the USBH_PTC_Receive() and USBH_PTC_Transmit() functions with their respective call-backs to receive and send buffers of data to your USB printer. Yes, it is that simple.

You can verify the enumeration and class of your printer from the structure “USBH_HandleTypeDef *phost” if you want to, but if this is an embedded application, you can probably ignore all of that, and it works automatically to connect even if the printer is not a “CDC” device.

Joe

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