Hi I was working on TM4c123 series previously and the firmware update through usb using rom bootloader was working fine.
Now I am using TM4C1290NCPDT for my project and when I give a command for firmware update through usb It is not going to DFU mode and the port is also not getting detected.
Here is the code which I am using and guide me if I am going somewhere wrong
clock is 120Mhz
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ROM_SysTickDisable();
HWREG(NVIC_DIS0) = 0xffffffff;
HWREG(NVIC_DIS1) = 0xffffffff;
HWREG(NVIC_DIS2) = 0xffffffff;
HWREG(NVIC_DIS3) = 0xffffffff;
HWREG(NVIC_DIS4) = 0xffffffff;
MAP_SysCtlUSBPLLEnable();
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0);
ROM_SysCtlPeripheralReset(SYSCTL_PERIPH_USB0);
//
// Call the ROM UART boot loader.
//
ROM_UpdateUSB(0);
**********************************************************
Regards
Harish
