void initLED(void) {
//SIM (System Integration Module) - rejestr dajacy kontrole nad podawaniem zegara peryferiom
//SCGC5 (System Clock Gating Control Register 5) - rejestr odpowiedzialny za taktowanie portow
SIM->SCGC5 |=
SIM_SCGC5_PORTD_MASK |
SIM_SCGC5_PORTE_MASK; //wlaczenie takowania portow
//PORT (Port Control and Interrupts) - rejestr decydujacy o tym, ktore piny wkorzystywane sa dla dancyh peryferiow
//PCR (Pin Control Register) - sluzy do ustawienia na multiplekserze danego pinu GPIO (001)
PORTD->PCR[LED_PIN_RED] = PORT_PCR_MUX(1UL);
PORTE->PCR[LED_PIN_GREEN] = PORT_PCR_MUX(1UL);
//GPIO (General Purpose Input Output)
//dla danego pinu trzeba okreslic kierunek, a potem konkretne zachowanie
//PDDR (Direction): 1 - output, 0 - input
//PDOR (Output)
//PSOR (Set)
//PCOR (Clear)
//PTOR (Toggle)
//PDIR (Input)
PTD->PDDR |= LED_MASK_RED;
PTE->PDDR |= LED_MASK_GREEN;
offLED( LED_MASK_ALL );
}
void offAllLEDs()
{
uchar i;
for(i=0;i<=7;i++)
{
offLED(i);
}
}
int main()
{
int fd = open("/dev/mem", O_RDWR | O_SYNC);
if (fd < 0)
{
printf("Could not open memory\n");
return 0;
}
setLED(fd);
sleep(2);
offLED(fd);
sleep(2);
}
void testLEDs(void)
{
uchar i;
while(1)
{
for(i=0;i<=7;i++)
{
onLED(i);
wait(1000);
}
for(i=0;i<=7;i++)
{
offLED(i);
}
wait(2000);
}
}
//level is between 0 and 3
void setLEDLevel(uchar level, uchar side)
{
uchar i=0; //values for left
int max=3; //default range 0-3
if(side==LEFT)
{
i=4; //new range 4-7
max=7;
level+=4; //shift level up by 4 because bucket ranges 0-3
}
for(;i<=max;i++)
{
if(i<=level) //turn on LEDs below and equal to the level
onLED(i);
else
offLED(i); //turn off LEDs above level
}
}
//U1-4 are left drum, U3-7,T0 are right drum from bottom to top.
void advanceLEDs(void)
{
static char currLED=0; //next one in cycle will be U1, which is first LED
//above must be in range 0 to 7 or trouble will occur.
offLED(currLED);
if(currLED>3)
currLED++;
else
currLED--;
if(currLED>7) //go above red, go back to top of green
currLED=3;
if(currLED<0) //go below green, go to bottom of red
currLED=4;
onLED(currLED);
}
