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TM4C1294NCPDT: tm4c1294ncpdt

shimon leonardo lewkowicz
Prodigy 30 points

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL

hello all

i need an option to  jump  from firmware to  usb dfu  bootloader without any reset.

and after the load is finish go  back  to  the new firmware also  without any reset.

need help

htanks 

  • 0
    TI__Guru**** 191906 points

    Hi,

      TivaWare bootloader can support USB DFU. The bootloader example in C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\boot_serial can support USB DFU by changing the bl_config.h to enable USB bootloading. The default of this example is for UART bootloading. You can reference this bl_config.h

    0310.bl_config.h

      There is also one change you must make in order for USB DFU to work due to an library issue. In bl_usbfuncs.c file you need to change on line 619

    FROM:

    HWREG(USB0_BASE + USB_O_CC) = (USB_CC_CLKEN | (7 << USB_CC_CLKDIV_S));

    TO:

    HWREG(USB0_BASE + USB_O_CC) = (USB_CC_CLKEN | (3 << USB_CC_CLKDIV_S));

    With this change for bl_usbfuncs.c and bl_config.h, you can create a flash-based USB DFU bootloader. 

    TivaWare also supports a ROM-based bootloader. Please refer to C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\boot_demo_usb. boot_demo_usb is a USB application supporting a mouse via the HID class and also publishes runtime DFU capability. This example will call the ROM-base bootloader to start a firmware update.