Aim: Simulate a low-speed USB1.1 device using cost-effective STM8 microcontrollers
Current progress: Able to enumerate the device as a vendor-defined HID device Able to receive data from the host
To-Do: Add support to "String Descriptors" "Hide" low level USB functions for high level designers
Hardware configuration:
- MCU(STM8S103F3P6) is work at 3.3V, supplied by USB 5V via a linear regulator(AMS1117)
- PC7 - "D+ green line"
- PC6 - "D- white line" + 1,5 kOm pull up to +3.3V
- PA1 and PA2 - 12M crystal oscillator
- NRST - 10K resistor to 3.3V and 0.1u capacitor to ground
- VCap - 0.1u capacitor to ground
Optional Bits: AFR0 - Port C6 = TIM1_CH1, C7 = TIM1_CH2 Above settings can be done using "light programmer" in STVD
Compiler: ST Visual Develop (STVD) + Cosmic CxSTM8 C compiler
Special thanks: Original author (Russian): https://github.com/ZiB/STM8S-USB HID Example (Chinese): https://github.com/wlianmin/stm8_usb
Background and references: http://www.usbmadesimple.co.uk/ums_3.htm http://www.beyondlogic.org/usbnutshell/usb4.shtml#Interrupt