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STM32F4 DISCOVERY KIT - USB JTAG Module Implementation

Question asked by rao_k.govinda on Feb 17, 2016
Latest reply on Feb 17, 2016 by Clive One

We have an requirement for field program-ability using USB interface. Our SW development team already using "STM32F4 DISCOVERY KIT" for their development activities. Controller is STM32F407VGT6.
The discovery kit uses "STM32F103C8T6" microcontroller to convert USB to JTAG interface. Also it has many other features (like CAN, 7 timers, 2 ADCs) and cost is around $3. 
I am looking for low cost solution to meet my cost target. 
 - Is there any standalone USB-JTAG IC available from ST/any other ?
 -  And does the existing solution requires any firmware to be loaded into STM32F103C8T6? ( because it is MCU )

Please suggest.