Hi
MCU: Tiva C TM4C123GH6PM
IDE: CCS V6.0.1
Connection: Stellaris In-Circuit Debug Interface
I have tried the "blinky" example in the resource explorer with EK-TM4C123GXL Launch Pad it had worked vey well.
But when I tried that code(writing down) and starting debugging it; it shows this error message when I start pressing Swich1 (PF4) (noting that the code is working and I had the output on my microcontroller) :
Error:
CORTEX_M4_0: GEL Output:
Memory Map Initialization Complete
CORTEX_M4_0: Error: Debug Port error occurred.
CORTEX_M4_0: Trouble Halting Target CPU.
Code:
//1.pre-processing directive
#include <stdint.h>
#include "tm4c123gh6pm.h"
//2.declaration section
unsigned long In;
unsigned long Out;
void PortF_Init(void);
// 3. Subroutines Section
int main(void){
PortF_Init();
while(1){
In = GPIO_PORTF_DATA_R&0x10; // read PF4 into Sw1
In = In>>2; // shift into position PF2
Out = GPIO_PORTF_DATA_R;
Out = Out&0xFB;
Out = Out|In;
GPIO_PORTF_DATA_R = Out; // output
}
}
// PF4 is input SW1 and PF2 is output Blue LED
void PortF_Init(void){ volatile unsigned long delay;
SYSCTL_RCGC2_R |= 0x00000020; // 1) activate clock for Port F
delay = SYSCTL_RCGC2_R; // allow time for clock to start
GPIO_PORTF_LOCK_R = 0x4C4F434B; // 2) unlock GPIO Port F
GPIO_PORTF_CR_R = 0x1F; // allow changes to PF4-0
// only PF0 needs to be unlocked, other bits can't be locked
GPIO_PORTF_AMSEL_R = 0x00; // 3) disable analog on PF
GPIO_PORTF_PCTL_R = 0x00000000; // 4) PCTL GPIO on PF4-0
GPIO_PORTF_DIR_R = 0x0E; // 5) PF4,PF0 in, PF3-1 out
GPIO_PORTF_AFSEL_R = 0x00; // 6) disable alt funct on PF7-0
GPIO_PORTF_PUR_R = 0x11; // enable pull-up on PF0 and PF4
GPIO_PORTF_DEN_R = 0x1F; // 7) enable digital I/O on PF4-0
}
