Difference between revisions of "IO Operations"
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| Line 18: | Line 18: | ||
SystemInit(); | SystemInit(); | ||
| − | LPC_PINCON->PINSEL3 = 0x00; | + | LPC_PINCON->PINSEL3 = 0x00; // Configure Pin as GPIO |
| − | util_BitSet(LPC_GPIO1->FIODIR,LED); | + | util_BitSet(LPC_GPIO1->FIODIR,LED); // Set pin direction as output |
| − | util_BitClear (LPC_GPIO1->FIODIR,SWITCH); // Set pin direction as input | + | util_BitClear (LPC_GPIO1->FIODIR,SWITCH); // Set pin direction as input |
while(1) | while(1) | ||
{ | { | ||
if (util_IsBitCleared (LPC_GPIO1->FIOPIN,SWITCH)) // check if switch is pressed | if (util_IsBitCleared (LPC_GPIO1->FIOPIN,SWITCH)) // check if switch is pressed | ||
| − | util_BitSet (LPC_GPIO1->FIOSET,LED); | + | util_BitSet (LPC_GPIO1->FIOSET,LED); // turn on LED |
else | else | ||
| − | util_BitSet (LPC_GPIO1->FIOCLR,LED); | + | util_BitSet (LPC_GPIO1->FIOCLR,LED); // turn off LED |
} | } | ||
} | } | ||
Revision as of 11:55, 17 March 2015
Amruta (talk) 11:24, 17 March 2015 (IST)
Basics
Code
- #include "lpc17xx.h" // NXP Library containing all port abd register definations
- #include "stdutils.h" // Explore Embedded library
- #define LED 29 //P1.29
- #define SWITCH 28 //P1.28
- int main()
- {
- SystemInit();
- LPC_PINCON->PINSEL3 = 0x00; // Configure Pin as GPIO
- util_BitSet(LPC_GPIO1->FIODIR,LED); // Set pin direction as output
- util_BitClear (LPC_GPIO1->FIODIR,SWITCH); // Set pin direction as input
- while(1)
- {
- if (util_IsBitCleared (LPC_GPIO1->FIOPIN,SWITCH)) // check if switch is pressed
- util_BitSet (LPC_GPIO1->FIOSET,LED); // turn on LED
- else
- util_BitSet (LPC_GPIO1->FIOCLR,LED); // turn off LED
- }
- }