Created
March 17, 2018 04:41
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#include "tm4c123ge6pm.h" | |
unsigned long In; // input from PF4 | |
unsigned long Out; // output to PF2 (blue LED) | |
// Function Prototypes | |
void PortF_Init(void); | |
// 3. Subroutines Section | |
// MAIN: Mandatory for a C Program to be executable | |
int main(void){ // initialize PF0 and PF4 and make them inputs | |
PortF_Init(); // make PF3-1 out (PF3-1 built-in LEDs) | |
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 | |
} | |
} | |
// Subroutine to initialize port F pins for input and output | |
// PF4 is input SW1 and PF2 is output Blue LED | |
// Inputs: None | |
// Outputs: None | |
// Notes: ... | |
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 | |
} |
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