Other Parts Discussed in Thread: EK-TM4C123GXL
Hi,
Even though GPIO AHB mode is enabled with SysCtlGPIOAHBEnable() we get ISR FAULT when we read the port in AHB mode.
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
SysCtlGPIOAHBEnable(SYSCTL_PERIPH_GPIOF);
Read = HWREG(GPIO_PORTF_AHB_BASE + GPIO_O_PUR); <- this code gets ISR FAULT
Please let me know what else should be taken care when using port in AHB mode.
Attached the complete code I am using. Note: it works normal in default APB mode.
And does Tiva C ROM library support AHB mode? couldn't find such API in the ROM user guide.
Best Regards
paddu
int main(void) { volatile uint32_t ReadReg = 0; // // Enable lazy stacking for interrupt handlers. This allows floating-point // instructions to be used within interrupt handlers, but at the expense of // extra stack usage. // ROM_FPULazyStackingEnable(); // // Set the clocking to run directly from the crystal. // ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN); // // Enable the GPIO port that is used for the on-board LED. // ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF); // // Enable the GPIO pins for the LED (PF2 & PF3). // ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2); SysCtlGPIOAHBEnable(SYSCTL_PERIPH_GPIOF); // // Initialize the UART. // ConfigureUART(); // Getting error with below code......... UARTprintf("Hello, world!\n"); ReadReg = HWREG(GPIO_PORTF_AHB_BASE + GPIO_O_PUR); // Error Code UARTprintf("ReadReg=%x\n", ReadReg); while(1); }