Part Number: TM4C123GH6PM
Tool/software:
I seem to have some sort of problem writing a one to Bit 0 of my Data Register and I can't find the fault. 9 gets changed to 8 and 3 gets changed to 2. When I correct it to an even number it shows up fine in my Debug Watch window. I rechecked my pin setup lines for PortE and I do believe they are correct. I also swapped out Tive Lunchpad Boards but damn, nothing works. Source code attached. Thank you.
/* Stepper.c Driving stepper in C using registers by addresses */
/* This program will start with a simple rotation of a stepper and get refined to include keypad input and LCD
output .*/
/*We are going with Port E pins: 9 >PE0, 8 >PE1, 7 >PE2 and 6 >PE3 because their default is GPIO */
/* PORTE data register */
#define PORTEDAT (*((volatile unsigned int*)0x400243FC)) // DS pg 662, GPIO Port E (APB) base: 0x4002.4000
// 3FC is needed to write to all 8 bits of Data Register at once. SEE Text pg 28
/* PORTE data direction register , 3FC is 0B001111111100 masked bits 9:2 means set all Port E outputs */
#define PORTEDIR (*((volatile unsigned int*)0x40024400)) // DS pg 662, GPIO Port E (APB) base: 0x4002.4000 */
/* PORTF digital enable register */
#define PORTEDEN (*((volatile unsigned int*)0x4002451C)) // DS pg 683, GPIO Port E (APB) base: 0x4002.4000
//0x51C is the offset for GPIODEN
/* run mode clock gating register */
#define RCGCGPIO (*((volatile unsigned int*)0x400FE608)) // DS pg 340. Clock gate. base: 0x400F.E000
//Bit 4 will be sey to enable the clock on Port E.
/* coprocessor access control register */
#define SCB_CPAC (*((volatile unsigned int*)0xE000ED88)) // Coprocessor access priviledge
void delayMs(int n); /* function prototype for delay, argument is delay in ms */
int main(void)
{
/* enable clock to GPIOE at clock gating register */
RCGCGPIO |= 0x10; // RCGCGPIO Or'd with 0x10 or 0b0001 0000 meaning bit 4 enables Port E clock
/* set PORTE pin3-1 as output pins */
PORTEDIR = 0x0E; // 0x0E is 0b0000 1110 Sets DIR on PortE to output.
/* set PORTE pin3-1 as digital pins */
PORTEDEN = 0x0E; // 0x0E is 0b0000 1110
PORTEDAT=0X00;
int x;
for (x = 0; x < 360; x++)
{
PORTEDAT = 0X09;
delayMs(500);
PORTEDAT = 0X0C;
delayMs(500);
PORTEDAT = 0X06;
delayMs(500);
PORTEDAT = 0X03;
delayMs(500);
}
}
/* delay n milliseconds (16 MHz CPU clock) */
void delayMs(int n)
{
int i, j;
for(i = 0 ; i < n; i++)
for(j = 0; j < 3180; j++)
{} /* do nothing for 1 ms */
}
/* This function is called by the startup assembly code to perform system specific initialization tasks.
void SystemInit(void)
{
Grant coprocessor access
This is required since TM4C123G has a floating point coprocessor
SCB_CPAC |= 0x00F00000;
}
*/
